Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

122 files changed, 18631 insertions, 0 deletions

diff --git a/taskcluster/gecko_taskgraph/transforms/__init__.py b/taskcluster/gecko_taskgraph/transforms/__init__.py
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/__init__.py
diff --git a/taskcluster/gecko_taskgraph/transforms/artifact.py b/taskcluster/gecko_taskgraph/transforms/artifact.py
new file mode 100644
index 0000000000..559148f7b4
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/artifact.py
@@ -0,0 +1,116 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+Apply different expiration dates to different artifacts based on a manifest file (artifacts.yml)
+"""
+import logging
+import os
+import sys
+
+import yaml
+from taskgraph.transforms.base import TransformSequence
+from yaml import YAMLError
+
+from gecko_taskgraph.transforms.job.common import get_expiration
+from gecko_taskgraph.util.workertypes import worker_type_implementation
+
+logger = logging.getLogger(__name__)
+
+transforms = TransformSequence()
+
+
+def read_artifact_manifest(manifest_path):
+    """Read the artifacts.yml manifest file and return it."""
+    # logger.info(f"The current directory is {os.getcwd()}")
+    try:
+        with open(manifest_path, "r") as ymlf:
+            yml = yaml.safe_load(ymlf.read())
+            return yml
+    except YAMLError as ye:
+        err = 'Failed to parse manifest "{manifest_path}". Invalid Yaml:'
+        err += ye
+        raise SystemExit(err)
+    except FileNotFoundError:
+        err = f'Failed to load manifest "{manifest_path}". File not found'
+        raise SystemExit(err)
+    except PermissionError:
+        err = f'Failed to load manifest "{manifest_path}". Permission Error'
+        raise SystemExit(err)
+
+
+@transforms.add
+def set_artifact_expiration(config, jobs):
+    """Set the expiration for certain artifacts based on a manifest file."""
+    """---
+       win:
+         - build_resources.json: short
+
+       linux:
+         - target.crashreporter-symbols-full.tar.zst: medium
+    """
+    transform_dir = os.path.dirname(__file__)
+    manifest = read_artifact_manifest(os.path.join(transform_dir, "artifacts.yml"))
+
+    for job in jobs:
+        try:
+            platform = job["attributes"]["build_platform"]
+        except KeyError:
+            err = "Tried to get build_platfrom for job, but it does not exist. Exiting."
+            raise SystemExit(err)
+        if "worker" in job:
+            if "env" in job["worker"]:
+                if isinstance(job["worker"]["env"], dict):
+                    job["worker"]["env"]["MOZ_ARTIFACT_PLATFORM"] = platform
+                else:
+                    raise SystemExit(
+                        f"Expected env to be a dict, but it was {type(job['worker']['env'])}"
+                    )
+            if "artifacts" in job["worker"]:
+                plat = platform.lower()
+                if "plain" in plat or "ccov" in plat or "rusttest" in plat:
+                    art_dict = None
+                elif (
+                    plat == "toolchain-wasm32-wasi-compiler-rt-trunk"
+                    or plat == "toolchain-linux64-x64-compiler-rt-trunk"
+                    or plat == "toolchain-linux64-x86-compiler-rt-trunk"
+                    or plat == "android-geckoview-docs"
+                ):
+                    art_dict = None
+                elif plat.startswith("win"):
+                    art_dict = manifest["win"]
+                elif plat.startswith("linux"):
+                    art_dict = manifest["linux"]
+                elif plat.startswith("mac"):
+                    art_dict = manifest["macos"]
+                elif plat.startswith("android"):
+                    art_dict = manifest["android"]
+                else:
+                    print(
+                        'The platform name "{plat}" didn\'t start with',
+                        '"win", "mac", "android", or "linux".',
+                        file=sys.stderr,
+                    )
+                    art_dict = None
+                worker_implementation, _ = worker_type_implementation(
+                    config.graph_config, config.params, job["worker-type"]
+                )
+                if worker_implementation == "docker-worker":
+                    artifact_dest = "/builds/worker/cidata/{}"
+                else:
+                    artifact_dest = "cidata/{}"
+
+                if art_dict is not None:
+                    for art_name in art_dict.keys():
+                        # The 'artifacts' key of a job is a list at this stage.
+                        # So, must append a new dict to the list
+                        expiry_policy = art_dict[art_name]
+                        expires = get_expiration(config, policy=expiry_policy)
+                        new_art = {
+                            "name": f"public/cidata/{art_name}",
+                            "path": artifact_dest.format(art_name),
+                            "type": "file",
+                            "expires-after": expires,
+                        }
+                        job["worker"]["artifacts"].append(new_art)
+        yield job
diff --git a/taskcluster/gecko_taskgraph/transforms/artifacts.yml b/taskcluster/gecko_taskgraph/transforms/artifacts.yml
new file mode 100644
index 0000000000..b41c657283
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/artifacts.yml
@@ -0,0 +1,16 @@
+---
+win:
+    target.crashreporter-symbols-full.tar.zst: shortest
+    sccache.log: shortest
+
+linux:
+    target.crashreporter-symbols-full.tar.zst: shortest
+    sccache.log: shortest
+
+macos:
+    target.crashreporter-symbols-full.tar.zst: shortest
+    sccache.log: shortest
+
+android:
+    target.crashreporter-symbols-full.tar.zst: shortest
+    sccache.log: shortest
diff --git a/taskcluster/gecko_taskgraph/transforms/attribution.py b/taskcluster/gecko_taskgraph/transforms/attribution.py
new file mode 100644
index 0000000000..935c274c03
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/attribution.py
@@ -0,0 +1,32 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+from taskgraph.transforms.base import TransformSequence
+
+transforms = TransformSequence()
+
+
+@transforms.add
+def stub_installer(config, jobs):
+    """Not all windows builds come with a stub installer (only win32, and not
+    on esr), so conditionally add it here based on our dependency's
+    stub-installer attribute."""
+    for job in jobs:
+        dep_name, dep_label = next(iter(job["dependencies"].items()))
+        dep_task = config.kind_dependencies_tasks[dep_label]
+        if dep_task.attributes.get("stub-installer"):
+            locale = job["attributes"].get("locale")
+            if locale:
+                artifact = f"{locale}/target.stub-installer.exe"
+            else:
+                artifact = "target.stub-installer.exe"
+            job["fetches"][dep_name].append(artifact)
+            job["run"]["command"] += [
+                "--input",
+                "/builds/worker/fetches/target.stub-installer.exe",
+            ]
+            job["attributes"]["release_artifacts"].append(
+                "public/build/target.stub-installer.exe"
+            )
+        yield job
diff --git a/taskcluster/gecko_taskgraph/transforms/balrog_submit.py b/taskcluster/gecko_taskgraph/transforms/balrog_submit.py
new file mode 100644
index 0000000000..067600f0cb
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/balrog_submit.py
@@ -0,0 +1,138 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+Transform the per-locale balrog task into an actual task description.
+"""
+
+from taskgraph.transforms.base import TransformSequence
+from taskgraph.util.schema import optionally_keyed_by, resolve_keyed_by
+from taskgraph.util.treeherder import replace_group
+from voluptuous import Optional
+
+from gecko_taskgraph.loader.single_dep import schema
+from gecko_taskgraph.transforms.task import task_description_schema
+from gecko_taskgraph.util.attributes import copy_attributes_from_dependent_job
+
+balrog_description_schema = schema.extend(
+    {
+        # unique label to describe this balrog task, defaults to balrog-{dep.label}
+        Optional("label"): str,
+        Optional(
+            "update-no-wnp",
+            description="Whether the parallel `-No-WNP` blob should be updated as well.",
+        ): optionally_keyed_by("release-type", bool),
+        # treeherder is allowed here to override any defaults we use for beetmover.  See
+        # taskcluster/gecko_taskgraph/transforms/task.py for the schema details, and the
+        # below transforms for defaults of various values.
+        Optional("treeherder"): task_description_schema["treeherder"],
+        Optional("attributes"): task_description_schema["attributes"],
+        # Shipping product / phase
+        Optional("shipping-product"): task_description_schema["shipping-product"],
+        Optional("shipping-phase"): task_description_schema["shipping-phase"],
+    }
+)
+
+
+transforms = TransformSequence()
+transforms.add_validate(balrog_description_schema)
+
+
+@transforms.add
+def handle_keyed_by(config, jobs):
+    """Resolve fields that can be keyed by platform, etc."""
+    fields = [
+        "update-no-wnp",
+    ]
+    for job in jobs:
+        label = job.get("dependent-task", object).__dict__.get("label", "?no-label?")
+        for field in fields:
+            resolve_keyed_by(
+                item=job,
+                field=field,
+                item_name=label,
+                **{
+                    "project": config.params["project"],
+                    "release-type": config.params["release_type"],
+                },
+            )
+        yield job
+
+
+@transforms.add
+def make_task_description(config, jobs):
+    for job in jobs:
+        dep_job = job["primary-dependency"]
+
+        treeherder = job.get("treeherder", {})
+        treeherder.setdefault("symbol", "c-Up(N)")
+        dep_th_platform = (
+            dep_job.task.get("extra", {})
+            .get("treeherder", {})
+            .get("machine", {})
+            .get("platform", "")
+        )
+        treeherder.setdefault("platform", f"{dep_th_platform}/opt")
+        treeherder.setdefault(
+            "tier", dep_job.task.get("extra", {}).get("treeherder", {}).get("tier", 1)
+        )
+        treeherder.setdefault("kind", "build")
+
+        attributes = copy_attributes_from_dependent_job(dep_job)
+
+        treeherder_job_symbol = dep_job.task["extra"]["treeherder"]["symbol"]
+        treeherder["symbol"] = replace_group(treeherder_job_symbol, "c-Up")
+
+        if dep_job.attributes.get("locale"):
+            attributes["locale"] = dep_job.attributes.get("locale")
+
+        label = job["label"]
+
+        description = (
+            "Balrog submission for locale '{locale}' for build '"
+            "{build_platform}/{build_type}'".format(
+                locale=attributes.get("locale", "en-US"),
+                build_platform=attributes.get("build_platform"),
+                build_type=attributes.get("build_type"),
+            )
+        )
+
+        upstream_artifacts = [
+            {
+                "taskId": {"task-reference": "<beetmover>"},
+                "taskType": "beetmover",
+                "paths": ["public/manifest.json"],
+            }
+        ]
+
+        dependencies = {"beetmover": dep_job.label}
+        for kind_dep in config.kind_dependencies_tasks.values():
+            if (
+                kind_dep.kind == "startup-test"
+                and kind_dep.attributes["build_platform"]
+                == attributes.get("build_platform")
+                and kind_dep.attributes["build_type"] == attributes.get("build_type")
+                and kind_dep.attributes.get("shipping_product")
+                == job.get("shipping-product")
+            ):
+                dependencies["startup-test"] = kind_dep.label
+
+        task = {
+            "label": label,
+            "description": description,
+            "worker-type": "balrog",
+            "worker": {
+                "implementation": "balrog",
+                "upstream-artifacts": upstream_artifacts,
+                "balrog-action": "v2-submit-locale",
+                "suffixes": ["", "-No-WNP"] if job.get("update-no-wnp") else [""],
+            },
+            "dependencies": dependencies,
+            "attributes": attributes,
+            "run-on-projects": dep_job.attributes.get("run_on_projects"),
+            "treeherder": treeherder,
+            "shipping-phase": job.get("shipping-phase", "promote"),
+            "shipping-product": job.get("shipping-product"),
+        }
+
+        yield task
diff --git a/taskcluster/gecko_taskgraph/transforms/balrog_toplevel.py b/taskcluster/gecko_taskgraph/transforms/balrog_toplevel.py
new file mode 100644
index 0000000000..6b06758f69
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/balrog_toplevel.py
@@ -0,0 +1,42 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+Transform the beetmover task into an actual task description.
+"""
+
+from mozilla_version.gecko import GeckoVersion
+from mozrelease.balrog import generate_update_properties
+from taskgraph.transforms.base import TransformSequence
+from taskgraph.util.yaml import load_yaml
+
+from gecko_taskgraph.util.scriptworker import get_release_config
+
+transforms = TransformSequence()
+
+
+@transforms.add
+def generate_update_line(config, jobs):
+    """Resolve fields that can be keyed by platform, etc."""
+    release_config = get_release_config(config)
+    for job in jobs:
+        config_file = job.pop("whats-new-config")
+        update_config = load_yaml(config_file)
+
+        product = job["shipping-product"]
+        if product == "devedition":
+            product = "firefox"
+        job["worker"]["update-line"] = {}
+        for blob_type, suffix in [("wnp", ""), ("no-wnp", "-No-WNP")]:
+            context = {
+                "release-type": config.params["release_type"],
+                "product": product,
+                "version": GeckoVersion.parse(release_config["appVersion"]),
+                "blob-type": blob_type,
+                "build-id": config.params["moz_build_date"],
+            }
+            job["worker"]["update-line"][suffix] = generate_update_properties(
+                context, update_config
+            )
+
+        yield job
diff --git a/taskcluster/gecko_taskgraph/transforms/beetmover.py b/taskcluster/gecko_taskgraph/transforms/beetmover.py
new file mode 100644
index 0000000000..93818707dd
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/beetmover.py
@@ -0,0 +1,165 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+Transform the beetmover task into an actual task description.
+"""
+
+from taskgraph.transforms.base import TransformSequence
+from taskgraph.util.treeherder import replace_group
+from voluptuous import Optional, Required
+
+from gecko_taskgraph.loader.single_dep import schema
+from gecko_taskgraph.transforms.task import task_description_schema
+from gecko_taskgraph.util.attributes import copy_attributes_from_dependent_job
+from gecko_taskgraph.util.scriptworker import (
+    generate_beetmover_artifact_map,
+    generate_beetmover_upstream_artifacts,
+    get_beetmover_action_scope,
+    get_beetmover_bucket_scope,
+)
+
+transforms = TransformSequence()
+
+beetmover_description_schema = schema.extend(
+    {
+        # unique label to describe this beetmover task, defaults to {dep.label}-beetmover
+        Optional("label"): str,
+        # treeherder is allowed here to override any defaults we use for beetmover.  See
+        # taskcluster/gecko_taskgraph/transforms/task.py for the schema details, and the
+        # below transforms for defaults of various values.
+        Optional("treeherder"): task_description_schema["treeherder"],
+        # locale is passed only for l10n beetmoving
+        Optional("locale"): str,
+        Required("shipping-phase"): task_description_schema["shipping-phase"],
+        Optional("shipping-product"): task_description_schema["shipping-product"],
+        Optional("attributes"): task_description_schema["attributes"],
+    }
+)
+
+
+transforms.add_validate(beetmover_description_schema)
+
+
+@transforms.add
+def make_task_description(config, jobs):
+    for job in jobs:
+        dep_job = job["primary-dependency"]
+        attributes = dep_job.attributes
+
+        treeherder = job.get("treeherder", {})
+        treeherder.setdefault(
+            "symbol", replace_group(dep_job.task["extra"]["treeherder"]["symbol"], "BM")
+        )
+        dep_th_platform = (
+            dep_job.task.get("extra", {})
+            .get("treeherder", {})
+            .get("machine", {})
+            .get("platform", "")
+        )
+        treeherder.setdefault("platform", f"{dep_th_platform}/opt")
+        treeherder.setdefault(
+            "tier", dep_job.task.get("extra", {}).get("treeherder", {}).get("tier", 1)
+        )
+        treeherder.setdefault("kind", "build")
+        label = job["label"]
+        description = (
+            "Beetmover submission for locale '{locale}' for build '"
+            "{build_platform}/{build_type}'".format(
+                locale=attributes.get("locale", "en-US"),
+                build_platform=attributes.get("build_platform"),
+                build_type=attributes.get("build_type"),
+            )
+        )
+
+        dependencies = {dep_job.kind: dep_job.label}
+
+        # XXX release snap-repackage has a variable number of dependencies, depending on how many
+        # "post-beetmover-dummy" jobs there are in the graph.
+        if dep_job.kind != "release-snap-repackage" and len(dep_job.dependencies) > 1:
+            raise NotImplementedError(
+                "Can't beetmove a signing task with multiple dependencies"
+            )
+        signing_dependencies = dep_job.dependencies
+        dependencies.update(signing_dependencies)
+
+        attributes = copy_attributes_from_dependent_job(dep_job)
+        attributes.update(job.get("attributes", {}))
+
+        if job.get("locale"):
+            attributes["locale"] = job["locale"]
+
+        bucket_scope = get_beetmover_bucket_scope(config)
+        action_scope = get_beetmover_action_scope(config)
+
+        task = {
+            "label": label,
+            "description": description,
+            "worker-type": "beetmover",
+            "scopes": [bucket_scope, action_scope],
+            "dependencies": dependencies,
+            "attributes": attributes,
+            "run-on-projects": dep_job.attributes.get("run_on_projects"),
+            "treeherder": treeherder,
+            "shipping-phase": job["shipping-phase"],
+        }
+
+        yield task
+
+
+def craft_release_properties(config, job):
+    params = config.params
+    build_platform = job["attributes"]["build_platform"]
+    build_platform = build_platform.replace("-shippable", "")
+    if build_platform.endswith("-source"):
+        build_platform = build_platform.replace("-source", "-release")
+
+    # XXX This should be explicitly set via build attributes or something
+    if "android" in job["label"] or "fennec" in job["label"]:
+        app_name = "Fennec"
+    elif config.graph_config["trust-domain"] == "comm":
+        app_name = "Thunderbird"
+    else:
+        # XXX Even DevEdition is called Firefox
+        app_name = "Firefox"
+
+    return {
+        "app-name": app_name,
+        "app-version": params["app_version"],
+        "branch": params["project"],
+        "build-id": params["moz_build_date"],
+        "hash-type": "sha512",
+        "platform": build_platform,
+    }
+
+
+@transforms.add
+def make_task_worker(config, jobs):
+    for job in jobs:
+        valid_beetmover_job = len(job["dependencies"]) == 2 and any(
+            ["signing" in j for j in job["dependencies"]]
+        )
+        # XXX release snap-repackage has a variable number of dependencies, depending on how many
+        # "post-beetmover-dummy" jobs there are in the graph.
+        if "-snap-" not in job["label"] and not valid_beetmover_job:
+            raise NotImplementedError("Beetmover must have two dependencies.")
+
+        locale = job["attributes"].get("locale")
+        platform = job["attributes"]["build_platform"]
+
+        worker = {
+            "implementation": "beetmover",
+            "release-properties": craft_release_properties(config, job),
+            "upstream-artifacts": generate_beetmover_upstream_artifacts(
+                config, job, platform, locale
+            ),
+            "artifact-map": generate_beetmover_artifact_map(
+                config, job, platform=platform, locale=locale
+            ),
+        }
+
+        if locale:
+            worker["locale"] = locale
+        job["worker"] = worker
+
+        yield job
diff --git a/taskcluster/gecko_taskgraph/transforms/beetmover_apt.py b/taskcluster/gecko_taskgraph/transforms/beetmover_apt.py
new file mode 100644
index 0000000000..8c56f1a968
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/beetmover_apt.py
@@ -0,0 +1,114 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+from itertools import islice
+
+from taskgraph import MAX_DEPENDENCIES
+from taskgraph.transforms.base import TransformSequence
+
+from gecko_taskgraph.util.platforms import architecture
+from gecko_taskgraph.util.scriptworker import (
+    generate_artifact_registry_gcs_sources,
+    get_beetmover_apt_repo_scope,
+    get_beetmover_repo_action_scope,
+)
+
+transforms = TransformSequence()
+
+
+@transforms.add
+def beetmover_apt(config, tasks):
+    product = (
+        "firefox"
+        if not config.params["release_type"]  # try
+        or config.params["release_type"] == "nightly"
+        else config.params["release_product"]
+    )
+    filtered_tasks = filter_beetmover_apt_tasks(tasks, product)
+    # There are too many beetmover-repackage dependencies for a single task
+    # and we hit the taskgraph dependencies limit.
+    # To work around this limitation, we chunk the would be task
+    # into tasks dependendent on, at most, half of MAX_DEPENDENCIES.
+    batches = batched(filtered_tasks, MAX_DEPENDENCIES // 2)
+    for index, batch in enumerate(batches):
+        dependencies = {}
+        gcs_sources = []
+        for task in batch:
+            dep = task["primary-dependency"]
+            dependencies[dep.label] = dep.label
+            gcs_sources.extend(generate_artifact_registry_gcs_sources(dep))
+        description = f"Batch {index + 1} of beetmover APT submissions for the {config.params['release_type']} .deb packages"
+        platform = "firefox-release/opt"
+        treeherder = {
+            "platform": platform,
+            "tier": 1,
+            "kind": "other",
+            "symbol": f"BM-apt(batch-{index + 1})",
+        }
+        apt_repo_scope = get_beetmover_apt_repo_scope(config)
+        repo_action_scope = get_beetmover_repo_action_scope(config)
+        attributes = {
+            "required_signoffs": ["mar-signing"],
+            "shippable": True,
+            "shipping_product": product,
+        }
+        task = {
+            "label": f"{config.kind}-{index + 1}-{platform}",
+            "description": description,
+            "worker-type": "beetmover",
+            "treeherder": treeherder,
+            "scopes": [apt_repo_scope, repo_action_scope],
+            "attributes": attributes,
+            "shipping-phase": "ship",
+            "shipping-product": product,
+            "dependencies": dependencies,
+        }
+        worker = {
+            "implementation": "beetmover-import-from-gcs-to-artifact-registry",
+            "product": product,
+            "gcs-sources": gcs_sources,
+        }
+        task["worker"] = worker
+        yield task
+
+
+def batched(iterable, n):
+    "Batch data into tuples of length n. The last batch may be shorter."
+    # batched('ABCDEFG', 3) --> ABC DEF G
+    if n < 1:
+        raise ValueError("n must be at least one")
+    it = iter(iterable)
+    batch = tuple(islice(it, n))
+    while batch:
+        yield batch
+        batch = tuple(islice(it, n))
+
+
+def filter_beetmover_apt_tasks(tasks, product):
+    return (task for task in tasks if filter_beetmover_apt_task(task, product))
+
+
+def filter_beetmover_apt_task(task, product):
+    # We only create beetmover-apt tasks for l10n beetmover-repackage tasks that
+    # beetmove langpack .deb packages. The langpack .deb packages support all
+    # architectures, so we generate them only on x86_64 tasks.
+    return (
+        is_x86_64_l10n_task(task) or is_not_l10n_task(task)
+    ) and is_task_for_product(task, product)
+
+
+def is_x86_64_l10n_task(task):
+    dep = task["primary-dependency"]
+    locale = dep.attributes.get("locale")
+    return locale and architecture(dep.attributes["build_platform"]) == "x86_64"
+
+
+def is_not_l10n_task(task):
+    dep = task["primary-dependency"]
+    locale = dep.attributes.get("locale")
+    return not locale
+
+
+def is_task_for_product(task, product):
+    dep = task["primary-dependency"]
+    return dep.attributes.get("shipping_product") == product
diff --git a/taskcluster/gecko_taskgraph/transforms/beetmover_checksums.py b/taskcluster/gecko_taskgraph/transforms/beetmover_checksums.py
new file mode 100644
index 0000000000..f595854a80
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/beetmover_checksums.py
@@ -0,0 +1,133 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+Transform the checksums signing task into an actual task description.
+"""
+
+from taskgraph.transforms.base import TransformSequence
+from taskgraph.util.treeherder import replace_group
+from voluptuous import Optional, Required
+
+from gecko_taskgraph.loader.single_dep import schema
+from gecko_taskgraph.transforms.beetmover import craft_release_properties
+from gecko_taskgraph.transforms.task import task_description_schema
+from gecko_taskgraph.util.attributes import copy_attributes_from_dependent_job
+from gecko_taskgraph.util.scriptworker import (
+    generate_beetmover_artifact_map,
+    generate_beetmover_upstream_artifacts,
+    get_beetmover_action_scope,
+    get_beetmover_bucket_scope,
+)
+
+beetmover_checksums_description_schema = schema.extend(
+    {
+        Required("attributes"): {str: object},
+        Optional("label"): str,
+        Optional("treeherder"): task_description_schema["treeherder"],
+        Optional("locale"): str,
+        Optional("shipping-phase"): task_description_schema["shipping-phase"],
+        Optional("shipping-product"): task_description_schema["shipping-product"],
+    }
+)
+
+transforms = TransformSequence()
+transforms.add_validate(beetmover_checksums_description_schema)
+
+
+@transforms.add
+def make_beetmover_checksums_description(config, jobs):
+    for job in jobs:
+        dep_job = job["primary-dependency"]
+        attributes = dep_job.attributes
+
+        treeherder = job.get("treeherder", {})
+        treeherder.setdefault(
+            "symbol",
+            replace_group(dep_job.task["extra"]["treeherder"]["symbol"], "BMcs"),
+        )
+        dep_th_platform = (
+            dep_job.task.get("extra", {})
+            .get("treeherder", {})
+            .get("machine", {})
+            .get("platform", "")
+        )
+        treeherder.setdefault("platform", f"{dep_th_platform}/opt")
+        treeherder.setdefault(
+            "tier", dep_job.task.get("extra", {}).get("treeherder", {}).get("tier", 1)
+        )
+        treeherder.setdefault("kind", "build")
+
+        label = job["label"]
+        build_platform = attributes.get("build_platform")
+
+        description = (
+            "Beetmover submission of checksums for locale '{locale}' for build '"
+            "{build_platform}/{build_type}'".format(
+                locale=attributes.get("locale", "en-US"),
+                build_platform=build_platform,
+                build_type=attributes.get("build_type"),
+            )
+        )
+
+        extra = {}
+        if "devedition" in build_platform:
+            extra["product"] = "devedition"
+        else:
+            extra["product"] = "firefox"
+
+        dependencies = {dep_job.kind: dep_job.label}
+
+        attributes = copy_attributes_from_dependent_job(dep_job)
+        attributes.update(job.get("attributes", {}))
+
+        if dep_job.attributes.get("locale"):
+            treeherder["symbol"] = "BMcs({})".format(dep_job.attributes.get("locale"))
+            attributes["locale"] = dep_job.attributes.get("locale")
+
+        bucket_scope = get_beetmover_bucket_scope(config)
+        action_scope = get_beetmover_action_scope(config)
+
+        task = {
+            "label": label,
+            "description": description,
+            "worker-type": "beetmover",
+            "scopes": [bucket_scope, action_scope],
+            "dependencies": dependencies,
+            "attributes": attributes,
+            "run-on-projects": dep_job.attributes.get("run_on_projects"),
+            "treeherder": treeherder,
+            "extra": extra,
+        }
+
+        if "shipping-phase" in job:
+            task["shipping-phase"] = job["shipping-phase"]
+
+        if "shipping-product" in job:
+            task["shipping-product"] = job["shipping-product"]
+
+        yield task
+
+
+@transforms.add
+def make_beetmover_checksums_worker(config, jobs):
+    for job in jobs:
+        locale = job["attributes"].get("locale")
+        platform = job["attributes"]["build_platform"]
+
+        worker = {
+            "implementation": "beetmover",
+            "release-properties": craft_release_properties(config, job),
+            "upstream-artifacts": generate_beetmover_upstream_artifacts(
+                config, job, platform, locale
+            ),
+            "artifact-map": generate_beetmover_artifact_map(
+                config, job, platform=platform, locale=locale
+            ),
+        }
+
+        if locale:
+            worker["locale"] = locale
+        job["worker"] = worker
+
+        yield job
diff --git a/taskcluster/gecko_taskgraph/transforms/beetmover_emefree_checksums.py b/taskcluster/gecko_taskgraph/transforms/beetmover_emefree_checksums.py
new file mode 100644
index 0000000000..9c2b49b6c5
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/beetmover_emefree_checksums.py
@@ -0,0 +1,139 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+Transform release-beetmover-source-checksums into an actual task description.
+"""
+
+from taskgraph.transforms.base import TransformSequence
+from voluptuous import Optional
+
+from gecko_taskgraph.loader.single_dep import schema
+from gecko_taskgraph.transforms.beetmover import craft_release_properties
+from gecko_taskgraph.transforms.task import task_description_schema
+from gecko_taskgraph.util.attributes import copy_attributes_from_dependent_job
+
+beetmover_checksums_description_schema = schema.extend(
+    {
+        Optional("label"): str,
+        Optional("extra"): object,
+        Optional("shipping-phase"): task_description_schema["shipping-phase"],
+        Optional("shipping-product"): task_description_schema["shipping-product"],
+    }
+)
+
+
+transforms = TransformSequence()
+transforms.add_validate(beetmover_checksums_description_schema)
+
+
+@transforms.add
+def make_beetmover_checksums_description(config, jobs):
+    for job in jobs:
+        dep_job = job["primary-dependency"]
+        attributes = dep_job.attributes
+        build_platform = attributes.get("build_platform")
+        if not build_platform:
+            raise Exception("Cannot find build platform!")
+        repack_id = dep_job.task.get("extra", {}).get("repack_id")
+        if not repack_id:
+            raise Exception("Cannot find repack id!")
+
+        label = dep_job.label.replace("beetmover-", "beetmover-checksums-")
+        description = (
+            "Beetmove checksums for repack_id '{repack_id}' for build '"
+            "{build_platform}/{build_type}'".format(
+                repack_id=repack_id,
+                build_platform=build_platform,
+                build_type=attributes.get("build_type"),
+            )
+        )
+
+        extra = {}
+        extra["partner_path"] = dep_job.task["payload"]["upstreamArtifacts"][0][
+            "locale"
+        ]
+        extra["repack_id"] = repack_id
+
+        dependencies = {dep_job.kind: dep_job.label}
+        for k, v in dep_job.dependencies.items():
+            if k.startswith("beetmover"):
+                dependencies[k] = v
+
+        attributes = copy_attributes_from_dependent_job(dep_job)
+
+        task = {
+            "label": label,
+            "description": description,
+            "worker-type": "{}/{}".format(
+                dep_job.task["provisionerId"],
+                dep_job.task["workerType"],
+            ),
+            "scopes": dep_job.task["scopes"],
+            "dependencies": dependencies,
+            "attributes": attributes,
+            "run-on-projects": dep_job.attributes.get("run_on_projects"),
+            "extra": extra,
+        }
+
+        if "shipping-phase" in job:
+            task["shipping-phase"] = job["shipping-phase"]
+
+        if "shipping-product" in job:
+            task["shipping-product"] = job["shipping-product"]
+
+        yield task
+
+
+def generate_upstream_artifacts(refs, partner_path):
+    # Until bug 1331141 is fixed, if you are adding any new artifacts here that
+    # need to be transfered to S3, please be aware you also need to follow-up
+    # with a beetmover patch in https://github.com/mozilla-releng/beetmoverscript/.
+    # See example in bug 1348286
+    common_paths = [
+        "public/target.checksums",
+    ]
+
+    upstream_artifacts = [
+        {
+            "taskId": {"task-reference": refs["beetmover"]},
+            "taskType": "signing",
+            "paths": common_paths,
+            "locale": f"beetmover-checksums/{partner_path}",
+        }
+    ]
+
+    return upstream_artifacts
+
+
+@transforms.add
+def make_beetmover_checksums_worker(config, jobs):
+    for job in jobs:
+        valid_beetmover_job = len(job["dependencies"]) == 1
+        if not valid_beetmover_job:
+            raise NotImplementedError("Beetmover checksums must have one dependency.")
+
+        refs = {
+            "beetmover": None,
+        }
+        for dependency in job["dependencies"].keys():
+            if dependency.endswith("beetmover"):
+                refs["beetmover"] = f"<{dependency}>"
+        if None in refs.values():
+            raise NotImplementedError(
+                "Beetmover checksums must have a beetmover dependency!"
+            )
+
+        worker = {
+            "implementation": "beetmover",
+            "release-properties": craft_release_properties(config, job),
+            "upstream-artifacts": generate_upstream_artifacts(
+                refs,
+                job["extra"]["partner_path"],
+            ),
+            "partner-public": True,
+        }
+
+        job["worker"] = worker
+
+        yield job
diff --git a/taskcluster/gecko_taskgraph/transforms/beetmover_geckoview.py b/taskcluster/gecko_taskgraph/transforms/beetmover_geckoview.py
new file mode 100644
index 0000000000..6eee5954e3
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/beetmover_geckoview.py
@@ -0,0 +1,166 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+Transform the beetmover task into an actual task description.
+"""
+
+
+from copy import deepcopy
+
+from taskgraph.transforms.base import TransformSequence
+from taskgraph.util.schema import optionally_keyed_by, resolve_keyed_by
+from voluptuous import Optional, Required
+
+from gecko_taskgraph.loader.single_dep import schema
+from gecko_taskgraph.transforms.beetmover import (
+    craft_release_properties as beetmover_craft_release_properties,
+)
+from gecko_taskgraph.transforms.task import task_description_schema
+from gecko_taskgraph.util.attributes import (
+    copy_attributes_from_dependent_job,
+    release_level,
+)
+from gecko_taskgraph.util.declarative_artifacts import (
+    get_geckoview_artifact_id,
+    get_geckoview_artifact_map,
+    get_geckoview_upstream_artifacts,
+)
+
+beetmover_description_schema = schema.extend(
+    {
+        Optional("label"): str,
+        Optional("treeherder"): task_description_schema["treeherder"],
+        Required("run-on-projects"): task_description_schema["run-on-projects"],
+        Required("run-on-hg-branches"): task_description_schema["run-on-hg-branches"],
+        Optional("bucket-scope"): optionally_keyed_by("release-level", str),
+        Optional("shipping-phase"): optionally_keyed_by(
+            "project", task_description_schema["shipping-phase"]
+        ),
+        Optional("shipping-product"): task_description_schema["shipping-product"],
+        Optional("attributes"): task_description_schema["attributes"],
+    }
+)
+
+transforms = TransformSequence()
+transforms.add_validate(beetmover_description_schema)
+
+
+@transforms.add
+def resolve_keys(config, jobs):
+    for job in jobs:
+        resolve_keyed_by(
+            job,
+            "run-on-hg-branches",
+            item_name=job["label"],
+            project=config.params["project"],
+        )
+        resolve_keyed_by(
+            job,
+            "shipping-phase",
+            item_name=job["label"],
+            project=config.params["project"],
+        )
+        resolve_keyed_by(
+            job,
+            "bucket-scope",
+            item_name=job["label"],
+            **{"release-level": release_level(config.params["project"])},
+        )
+        yield job
+
+
+@transforms.add
+def split_maven_packages(config, jobs):
+    for job in jobs:
+        dep_job = job["primary-dependency"]
+        attributes = copy_attributes_from_dependent_job(dep_job)
+        for package in attributes["maven_packages"]:
+            package_job = deepcopy(job)
+            package_job["maven-package"] = package
+            yield package_job
+
+
+@transforms.add
+def make_task_description(config, jobs):
+    for job in jobs:
+        dep_job = job["primary-dependency"]
+        attributes = copy_attributes_from_dependent_job(dep_job)
+        attributes.update(job.get("attributes", {}))
+
+        treeherder = job.get("treeherder", {})
+        dep_th_platform = (
+            dep_job.task.get("extra", {})
+            .get("treeherder", {})
+            .get("machine", {})
+            .get("platform", "")
+        )
+        treeherder.setdefault("platform", f"{dep_th_platform}/opt")
+        treeherder.setdefault("tier", 2)
+        treeherder.setdefault("kind", "build")
+        package = job["maven-package"]
+        treeherder.setdefault("symbol", f"BM-{package}")
+        label = job["label"]
+        description = (
+            "Beetmover submission for geckoview"
+            "{build_platform}/{build_type}'".format(
+                build_platform=attributes.get("build_platform"),
+                build_type=attributes.get("build_type"),
+            )
+        )
+
+        dependencies = deepcopy(dep_job.dependencies)
+        dependencies[dep_job.kind] = dep_job.label
+
+        if job.get("locale"):
+            attributes["locale"] = job["locale"]
+
+        attributes["run_on_hg_branches"] = job["run-on-hg-branches"]
+
+        task = {
+            "label": f"{package}-{label}",
+            "description": description,
+            "worker-type": "beetmover",
+            "scopes": [
+                job["bucket-scope"],
+                "project:releng:beetmover:action:push-to-maven",
+            ],
+            "dependencies": dependencies,
+            "attributes": attributes,
+            "run-on-projects": job["run-on-projects"],
+            "treeherder": treeherder,
+            "shipping-phase": job["shipping-phase"],
+            "maven-package": package,
+        }
+
+        yield task
+
+
+@transforms.add
+def make_task_worker(config, jobs):
+    for job in jobs:
+        job["worker"] = {
+            "artifact-map": get_geckoview_artifact_map(config, job),
+            "implementation": "beetmover-maven",
+            "release-properties": craft_release_properties(config, job),
+            "upstream-artifacts": get_geckoview_upstream_artifacts(
+                config, job, job["maven-package"]
+            ),
+        }
+        del job["maven-package"]
+
+        yield job
+
+
+def craft_release_properties(config, job):
+    release_properties = beetmover_craft_release_properties(config, job)
+
+    release_properties["artifact-id"] = get_geckoview_artifact_id(
+        config,
+        job["attributes"]["build_platform"],
+        job["maven-package"],
+        job["attributes"].get("update-channel"),
+    )
+    release_properties["app-name"] = "geckoview"
+
+    return release_properties
diff --git a/taskcluster/gecko_taskgraph/transforms/beetmover_langpack_checksums.py b/taskcluster/gecko_taskgraph/transforms/beetmover_langpack_checksums.py
new file mode 100644
index 0000000000..9318ed29d4
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/beetmover_langpack_checksums.py
@@ -0,0 +1,128 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+Transform release-beetmover-langpack-checksums into an actual task description.
+"""
+
+from taskgraph.transforms.base import TransformSequence
+from taskgraph.util.treeherder import inherit_treeherder_from_dep
+from voluptuous import Optional, Required
+
+from gecko_taskgraph.loader.single_dep import schema
+from gecko_taskgraph.transforms.beetmover import craft_release_properties
+from gecko_taskgraph.transforms.task import task_description_schema
+from gecko_taskgraph.util.attributes import copy_attributes_from_dependent_job
+from gecko_taskgraph.util.scriptworker import (
+    generate_beetmover_artifact_map,
+    generate_beetmover_upstream_artifacts,
+    get_beetmover_action_scope,
+    get_beetmover_bucket_scope,
+)
+
+beetmover_checksums_description_schema = schema.extend(
+    {
+        Required("attributes"): {str: object},
+        Optional("label"): str,
+        Optional("treeherder"): task_description_schema["treeherder"],
+        Optional("locale"): str,
+        Optional("shipping-phase"): task_description_schema["shipping-phase"],
+        Optional("shipping-product"): task_description_schema["shipping-product"],
+    }
+)
+
+transforms = TransformSequence()
+transforms.add_validate(beetmover_checksums_description_schema)
+
+
+@transforms.add
+def make_beetmover_checksums_description(config, jobs):
+    for job in jobs:
+        dep_job = job["primary-dependency"]
+        attributes = dep_job.attributes
+
+        treeherder = inherit_treeherder_from_dep(job, dep_job)
+        treeherder.setdefault(
+            "symbol", "BMcslang(N{})".format(attributes.get("l10n_chunk", ""))
+        )
+
+        label = job["label"]
+        build_platform = attributes.get("build_platform")
+
+        description = "Beetmover submission of checksums for langpack files"
+
+        extra = {}
+        if "devedition" in build_platform:
+            extra["product"] = "devedition"
+        else:
+            extra["product"] = "firefox"
+
+        dependencies = {dep_job.kind: dep_job.label}
+        for k, v in dep_job.dependencies.items():
+            if k.startswith("beetmover"):
+                dependencies[k] = v
+
+        attributes = copy_attributes_from_dependent_job(dep_job)
+        if "chunk_locales" in dep_job.attributes:
+            attributes["chunk_locales"] = dep_job.attributes["chunk_locales"]
+        attributes.update(job.get("attributes", {}))
+
+        bucket_scope = get_beetmover_bucket_scope(config)
+        action_scope = get_beetmover_action_scope(config)
+
+        task = {
+            "label": label,
+            "description": description,
+            "worker-type": "beetmover",
+            "scopes": [bucket_scope, action_scope],
+            "dependencies": dependencies,
+            "attributes": attributes,
+            "run-on-projects": dep_job.attributes.get("run_on_projects"),
+            "treeherder": treeherder,
+            "extra": extra,
+        }
+
+        if "shipping-phase" in job:
+            task["shipping-phase"] = job["shipping-phase"]
+
+        if "shipping-product" in job:
+            task["shipping-product"] = job["shipping-product"]
+
+        yield task
+
+
+@transforms.add
+def make_beetmover_checksums_worker(config, jobs):
+    for job in jobs:
+        valid_beetmover_job = len(job["dependencies"]) == 1
+        if not valid_beetmover_job:
+            raise NotImplementedError("Beetmover checksums must have one dependency.")
+
+        locales = job["attributes"].get("chunk_locales")
+        platform = job["attributes"]["build_platform"]
+
+        refs = {
+            "beetmover": None,
+        }
+        for dependency in job["dependencies"].keys():
+            if dependency.startswith("release-beetmover"):
+                refs["beetmover"] = f"<{dependency}>"
+        if None in refs.values():
+            raise NotImplementedError(
+                "Beetmover checksums must have a beetmover dependency!"
+            )
+
+        worker = {
+            "implementation": "beetmover",
+            "release-properties": craft_release_properties(config, job),
+            "upstream-artifacts": generate_beetmover_upstream_artifacts(
+                config, job, platform, locales
+            ),
+            "artifact-map": generate_beetmover_artifact_map(
+                config, job, platform=platform, locale=locales
+            ),
+        }
+
+        job["worker"] = worker
+
+        yield job
diff --git a/taskcluster/gecko_taskgraph/transforms/beetmover_push_to_release.py b/taskcluster/gecko_taskgraph/transforms/beetmover_push_to_release.py
new file mode 100644
index 0000000000..b6307d93cf
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/beetmover_push_to_release.py
@@ -0,0 +1,93 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+Transform the beetmover-push-to-release task into a task description.
+"""
+
+from taskgraph.transforms.base import TransformSequence
+from taskgraph.util.schema import Schema, taskref_or_string
+from voluptuous import Optional, Required
+
+from gecko_taskgraph.transforms.task import task_description_schema
+from gecko_taskgraph.util.scriptworker import (
+    add_scope_prefix,
+    get_beetmover_bucket_scope,
+)
+
+beetmover_push_to_release_description_schema = Schema(
+    {
+        Required("name"): str,
+        Required("product"): str,
+        Required("treeherder-platform"): str,
+        Optional("attributes"): {str: object},
+        Optional("job-from"): task_description_schema["job-from"],
+        Optional("run"): {str: object},
+        Optional("run-on-projects"): task_description_schema["run-on-projects"],
+        Optional("dependencies"): {str: taskref_or_string},
+        Optional("index"): {str: str},
+        Optional("routes"): [str],
+        Required("shipping-phase"): task_description_schema["shipping-phase"],
+        Required("shipping-product"): task_description_schema["shipping-product"],
+        Optional("extra"): task_description_schema["extra"],
+        Optional("worker"): {
+            Optional("max-run-time"): int,
+        },
+    }
+)
+
+
+transforms = TransformSequence()
+transforms.add_validate(beetmover_push_to_release_description_schema)
+
+
+@transforms.add
+def make_beetmover_push_to_release_description(config, jobs):
+    for job in jobs:
+        treeherder = job.get("treeherder", {})
+        treeherder.setdefault("symbol", "Rel(BM-C)")
+        treeherder.setdefault("tier", 1)
+        treeherder.setdefault("kind", "build")
+        treeherder.setdefault("platform", job["treeherder-platform"])
+
+        label = job["name"]
+        description = "Beetmover push to release for '{product}'".format(
+            product=job["product"]
+        )
+
+        bucket_scope = get_beetmover_bucket_scope(config)
+        action_scope = add_scope_prefix(config, "beetmover:action:push-to-releases")
+
+        task = {
+            "label": label,
+            "description": description,
+            "worker-type": "beetmover",
+            "scopes": [bucket_scope, action_scope],
+            "product": job["product"],
+            "dependencies": job["dependencies"],
+            "attributes": job.get("attributes", {}),
+            "run-on-projects": job.get("run-on-projects"),
+            "treeherder": treeherder,
+            "shipping-phase": job.get("shipping-phase", "push"),
+            "shipping-product": job.get("shipping-product"),
+            "routes": job.get("routes", []),
+            "extra": job.get("extra", {}),
+            "worker": job.get("worker", {}),
+        }
+
+        yield task
+
+
+@transforms.add
+def make_beetmover_push_to_release_worker(config, jobs):
+    for job in jobs:
+        worker = {
+            "implementation": "beetmover-push-to-release",
+            "product": job["product"],
+        }
+        if job.get("worker", {}).get("max-run-time"):
+            worker["max-run-time"] = job["worker"]["max-run-time"]
+        job["worker"] = worker
+        del job["product"]
+
+        yield job
diff --git a/taskcluster/gecko_taskgraph/transforms/beetmover_repackage.py b/taskcluster/gecko_taskgraph/transforms/beetmover_repackage.py
new file mode 100644
index 0000000000..a1ce911b9f
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/beetmover_repackage.py
@@ -0,0 +1,327 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+Transform the beetmover task into an actual task description.
+"""
+
+import logging
+
+from taskgraph.transforms.base import TransformSequence
+from taskgraph.util.taskcluster import get_artifact_prefix
+from taskgraph.util.treeherder import inherit_treeherder_from_dep, replace_group
+from voluptuous import Optional, Required
+
+from gecko_taskgraph.loader.multi_dep import schema
+from gecko_taskgraph.transforms.beetmover import craft_release_properties
+from gecko_taskgraph.transforms.task import task_description_schema
+from gecko_taskgraph.util.attributes import copy_attributes_from_dependent_job
+from gecko_taskgraph.util.partials import (
+    get_balrog_platform_name,
+    get_partials_artifacts_from_params,
+    get_partials_info_from_params,
+)
+from gecko_taskgraph.util.scriptworker import (
+    generate_beetmover_artifact_map,
+    generate_beetmover_partials_artifact_map,
+    generate_beetmover_upstream_artifacts,
+    get_beetmover_action_scope,
+    get_beetmover_bucket_scope,
+)
+
+logger = logging.getLogger(__name__)
+
+
+beetmover_description_schema = schema.extend(
+    {
+        # unique label to describe this beetmover task, defaults to {dep.label}-beetmover
+        Required("label"): str,
+        # treeherder is allowed here to override any defaults we use for beetmover.  See
+        # taskcluster/gecko_taskgraph/transforms/task.py for the schema details, and the
+        # below transforms for defaults of various values.
+        Optional("treeherder"): task_description_schema["treeherder"],
+        Optional("attributes"): task_description_schema["attributes"],
+        # locale is passed only for l10n beetmoving
+        Optional("locale"): str,
+        Required("shipping-phase"): task_description_schema["shipping-phase"],
+        # Optional until we fix asan (run_on_projects?)
+        Optional("shipping-product"): task_description_schema["shipping-product"],
+    }
+)
+
+transforms = TransformSequence()
+transforms.add_validate(beetmover_description_schema)
+
+
+def get_task_by_suffix(tasks, suffix):
+    """
+    Given tasks<dict>, returns the key to the task with provided suffix<str>
+    Raises exception if more than one task is found
+
+    Args:
+        tasks (Dict): Map of labels to tasks
+        suffix (str): Suffix for the desired task
+
+    Returns
+        str: The key to the desired task
+    """
+    labels = []
+    for label in tasks.keys():
+        if label.endswith(suffix):
+            labels.append(label)
+    if len(labels) > 1:
+        raise Exception(
+            f"There should only be a single task with suffix: {suffix} - found {len(labels)}"
+        )
+    return labels[0]
+
+
+@transforms.add
+def make_task_description(config, jobs):
+    for job in jobs:
+        dep_job = job["primary-dependency"]
+        attributes = dep_job.attributes
+
+        treeherder = inherit_treeherder_from_dep(job, dep_job)
+        upstream_symbol = dep_job.task["extra"]["treeherder"]["symbol"]
+        if "build" in job["dependent-tasks"]:
+            upstream_symbol = job["dependent-tasks"]["build"].task["extra"][
+                "treeherder"
+            ]["symbol"]
+        treeherder.setdefault("symbol", replace_group(upstream_symbol, "BMR"))
+        label = job["label"]
+        description = (
+            "Beetmover submission for locale '{locale}' for build '"
+            "{build_platform}/{build_type}'".format(
+                locale=attributes.get("locale", "en-US"),
+                build_platform=attributes.get("build_platform"),
+                build_type=attributes.get("build_type"),
+            )
+        )
+
+        upstream_deps = job["dependent-tasks"]
+
+        signing_name = "build-signing"
+        build_name = "build"
+        repackage_name = "repackage"
+        repackage_signing_name = "repackage-signing"
+        msi_signing_name = "repackage-signing-msi"
+        msix_signing_name = "repackage-signing-shippable-l10n-msix"
+        mar_signing_name = "mar-signing"
+        attribution_name = "attribution"
+        repackage_deb_name = "repackage-deb"
+        if job.get("locale"):
+            signing_name = "shippable-l10n-signing"
+            build_name = "shippable-l10n"
+            repackage_name = "repackage-l10n"
+            repackage_signing_name = "repackage-signing-l10n"
+            mar_signing_name = "mar-signing-l10n"
+            attribution_name = "attribution-l10n"
+            repackage_deb_name = "repackage-deb-l10n"
+
+        # The upstream "signing" task for macosx is either *-mac-signing or *-mac-notarization
+        if attributes.get("build_platform", "").startswith("macosx"):
+            # We use the signing task on level 1 and notarization on level 3
+            if int(config.params.get("level", 0)) < 3:
+                signing_name = get_task_by_suffix(upstream_deps, "-mac-signing")
+            else:
+                signing_name = get_task_by_suffix(upstream_deps, "-mac-notarization")
+            if not signing_name:
+                raise Exception("Could not find upstream kind for mac signing.")
+
+        dependencies = {
+            "build": upstream_deps[build_name],
+            "repackage": upstream_deps[repackage_name],
+            "signing": upstream_deps[signing_name],
+            "mar-signing": upstream_deps[mar_signing_name],
+        }
+        if "partials-signing" in upstream_deps:
+            dependencies["partials-signing"] = upstream_deps["partials-signing"]
+        if msi_signing_name in upstream_deps:
+            dependencies[msi_signing_name] = upstream_deps[msi_signing_name]
+        if msix_signing_name in upstream_deps:
+            dependencies[msix_signing_name] = upstream_deps[msix_signing_name]
+        if repackage_signing_name in upstream_deps:
+            dependencies["repackage-signing"] = upstream_deps[repackage_signing_name]
+        if attribution_name in upstream_deps:
+            dependencies[attribution_name] = upstream_deps[attribution_name]
+        if repackage_deb_name in upstream_deps:
+            dependencies[repackage_deb_name] = upstream_deps[repackage_deb_name]
+
+        attributes = copy_attributes_from_dependent_job(dep_job)
+        attributes.update(job.get("attributes", {}))
+        if job.get("locale"):
+            attributes["locale"] = job["locale"]
+
+        bucket_scope = get_beetmover_bucket_scope(config)
+        action_scope = get_beetmover_action_scope(config)
+
+        task = {
+            "label": label,
+            "description": description,
+            "worker-type": "beetmover",
+            "scopes": [bucket_scope, action_scope],
+            "dependencies": dependencies,
+            "attributes": attributes,
+            "run-on-projects": dep_job.attributes.get("run_on_projects"),
+            "treeherder": treeherder,
+            "shipping-phase": job["shipping-phase"],
+            "shipping-product": job.get("shipping-product"),
+        }
+
+        yield task
+
+
+def generate_partials_upstream_artifacts(job, artifacts, platform, locale=None):
+    artifact_prefix = get_artifact_prefix(job)
+    if locale and locale != "en-US":
+        artifact_prefix = f"{artifact_prefix}/{locale}"
+
+    upstream_artifacts = [
+        {
+            "taskId": {"task-reference": "<partials-signing>"},
+            "taskType": "signing",
+            "paths": [f"{artifact_prefix}/{path}" for path, _ in artifacts],
+            "locale": locale or "en-US",
+        }
+    ]
+
+    return upstream_artifacts
+
+
+@transforms.add
+def make_task_worker(config, jobs):
+    for job in jobs:
+        locale = job["attributes"].get("locale")
+        platform = job["attributes"]["build_platform"]
+
+        worker = {
+            "implementation": "beetmover",
+            "release-properties": craft_release_properties(config, job),
+            "upstream-artifacts": generate_beetmover_upstream_artifacts(
+                config, job, platform, locale
+            ),
+            "artifact-map": generate_beetmover_artifact_map(
+                config, job, platform=platform, locale=locale
+            ),
+        }
+
+        if locale:
+            worker["locale"] = locale
+        job["worker"] = worker
+
+        yield job
+
+
+@transforms.add
+def strip_unwanted_langpacks_from_worker(config, jobs):
+    """Strips out langpacks where we didn't sign them.
+
+    This explicitly deletes langpacks from upstream artifacts and from artifact-maps.
+    Due to limitations in declarative artifacts, doing this was our easiest way right now.
+    """
+    ALWAYS_OK_PLATFORMS = {"linux64-shippable", "linux64-devedition"}
+    OSX_OK_PLATFORMS = {"macosx64-shippable", "macosx64-devedition"}
+    for job in jobs:
+        platform = job["attributes"].get("build_platform")
+        if platform in ALWAYS_OK_PLATFORMS:
+            # No need to strip anything
+            yield job
+            continue
+
+        for map in job["worker"].get("artifact-map", [])[:]:
+            if not any([path.endswith("target.langpack.xpi") for path in map["paths"]]):
+                continue
+            if map["locale"] == "ja-JP-mac":
+                # This locale should only exist on mac
+                assert platform in OSX_OK_PLATFORMS
+                continue
+            # map[paths] is being modified while iterating, so we need to resolve the
+            # ".keys()" iterator up front by throwing it into a list.
+            for path in list(map["paths"].keys()):
+                if path.endswith("target.langpack.xpi"):
+                    del map["paths"][path]
+            if map["paths"] == {}:
+                job["worker"]["artifact-map"].remove(map)
+
+        for artifact in job["worker"].get("upstream-artifacts", []):
+            if not any(
+                [path.endswith("target.langpack.xpi") for path in artifact["paths"]]
+            ):
+                continue
+            if artifact["locale"] == "ja-JP-mac":
+                # This locale should only exist on mac
+                assert platform in OSX_OK_PLATFORMS
+                continue
+            artifact["paths"] = [
+                path
+                for path in artifact["paths"]
+                if not path.endswith("target.langpack.xpi")
+            ]
+            if artifact["paths"] == []:
+                job["worker"]["upstream-artifacts"].remove(artifact)
+
+        yield job
+
+
+@transforms.add
+def make_partials_artifacts(config, jobs):
+    for job in jobs:
+        locale = job["attributes"].get("locale")
+        if not locale:
+            locale = "en-US"
+
+        platform = job["attributes"]["build_platform"]
+
+        if "partials-signing" not in job["dependencies"]:
+            yield job
+            continue
+
+        balrog_platform = get_balrog_platform_name(platform)
+        artifacts = get_partials_artifacts_from_params(
+            config.params.get("release_history"), balrog_platform, locale
+        )
+
+        upstream_artifacts = generate_partials_upstream_artifacts(
+            job, artifacts, balrog_platform, locale
+        )
+
+        job["worker"]["upstream-artifacts"].extend(upstream_artifacts)
+
+        extra = list()
+
+        partials_info = get_partials_info_from_params(
+            config.params.get("release_history"), balrog_platform, locale
+        )
+
+        job["worker"]["artifact-map"].extend(
+            generate_beetmover_partials_artifact_map(
+                config, job, partials_info, platform=platform, locale=locale
+            )
+        )
+
+        for artifact in partials_info:
+            artifact_extra = {
+                "locale": locale,
+                "artifact_name": artifact,
+                "buildid": partials_info[artifact]["buildid"],
+                "platform": balrog_platform,
+            }
+            for rel_attr in ("previousBuildNumber", "previousVersion"):
+                if partials_info[artifact].get(rel_attr):
+                    artifact_extra[rel_attr] = partials_info[artifact][rel_attr]
+            extra.append(artifact_extra)
+
+        job.setdefault("extra", {})
+        job["extra"]["partials"] = extra
+
+        yield job
+
+
+@transforms.add
+def convert_deps(config, jobs):
+    for job in jobs:
+        job["dependencies"] = {
+            name: dep_job.label for name, dep_job in job["dependencies"].items()
+        }
+        yield job
diff --git a/taskcluster/gecko_taskgraph/transforms/beetmover_repackage_l10n.py b/taskcluster/gecko_taskgraph/transforms/beetmover_repackage_l10n.py
new file mode 100644
index 0000000000..da2a41ccb3
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/beetmover_repackage_l10n.py
@@ -0,0 +1,44 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+Transform the signing task into an actual task description.
+"""
+
+
+from taskgraph.transforms.base import TransformSequence
+from taskgraph.util.treeherder import join_symbol
+
+transforms = TransformSequence()
+
+
+@transforms.add
+def make_beetmover_description(config, jobs):
+    for job in jobs:
+        dep_job = job["primary-dependency"]
+
+        locale = dep_job.attributes.get("locale")
+        if not locale:
+            yield job
+            continue
+
+        group = "BMR"
+
+        # add the locale code
+        symbol = locale
+
+        treeherder = {
+            "symbol": join_symbol(group, symbol),
+        }
+
+        beet_description = {
+            "label": job["label"],
+            "primary-dependency": dep_job,
+            "dependent-tasks": job["dependent-tasks"],
+            "attributes": job["attributes"],
+            "treeherder": treeherder,
+            "locale": locale,
+            "shipping-phase": job["shipping-phase"],
+            "shipping-product": job["shipping-product"],
+        }
+        yield beet_description
diff --git a/taskcluster/gecko_taskgraph/transforms/beetmover_repackage_partner.py b/taskcluster/gecko_taskgraph/transforms/beetmover_repackage_partner.py
new file mode 100644
index 0000000000..40dc370f33
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/beetmover_repackage_partner.py
@@ -0,0 +1,326 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+Transform the beetmover task into an actual task description.
+"""
+
+import logging
+from copy import deepcopy
+
+from taskgraph.transforms.base import TransformSequence
+from taskgraph.util.schema import optionally_keyed_by, resolve_keyed_by
+from taskgraph.util.taskcluster import get_artifact_prefix
+from voluptuous import Any, Optional, Required
+
+from gecko_taskgraph.loader.single_dep import schema
+from gecko_taskgraph.transforms.beetmover import craft_release_properties
+from gecko_taskgraph.transforms.task import task_description_schema
+from gecko_taskgraph.util.attributes import (
+    copy_attributes_from_dependent_job,
+    release_level,
+)
+from gecko_taskgraph.util.partners import get_ftp_platform, get_partner_config_by_kind
+from gecko_taskgraph.util.scriptworker import (
+    add_scope_prefix,
+    get_beetmover_bucket_scope,
+)
+
+logger = logging.getLogger(__name__)
+
+
+beetmover_description_schema = schema.extend(
+    {
+        # unique label to describe this beetmover task, defaults to {dep.label}-beetmover
+        Optional("label"): str,
+        Required("partner-bucket-scope"): optionally_keyed_by("release-level", str),
+        Required("partner-public-path"): Any(None, str),
+        Required("partner-private-path"): Any(None, str),
+        Optional("extra"): object,
+        Required("shipping-phase"): task_description_schema["shipping-phase"],
+        Optional("shipping-product"): task_description_schema["shipping-product"],
+        Optional("priority"): task_description_schema["priority"],
+    }
+)
+
+transforms = TransformSequence()
+transforms.add_validate(beetmover_description_schema)
+
+
+@transforms.add
+def resolve_keys(config, jobs):
+    for job in jobs:
+        resolve_keyed_by(
+            job,
+            "partner-bucket-scope",
+            item_name=job["label"],
+            **{"release-level": release_level(config.params["project"])},
+        )
+        yield job
+
+
+@transforms.add
+def make_task_description(config, jobs):
+    for job in jobs:
+        dep_job = job["primary-dependency"]
+        repack_id = dep_job.task.get("extra", {}).get("repack_id")
+        if not repack_id:
+            raise Exception("Cannot find repack id!")
+
+        attributes = dep_job.attributes
+        build_platform = attributes.get("build_platform")
+        if not build_platform:
+            raise Exception("Cannot find build platform!")
+
+        label = dep_job.label.replace("repackage-signing-l10n", "beetmover-")
+        label = dep_job.label.replace("repackage-signing-", "beetmover-")
+        label = label.replace("repackage-", "beetmover-")
+        label = label.replace("chunking-dummy-", "beetmover-")
+        description = (
+            "Beetmover submission for repack_id '{repack_id}' for build '"
+            "{build_platform}/{build_type}'".format(
+                repack_id=repack_id,
+                build_platform=build_platform,
+                build_type=attributes.get("build_type"),
+            )
+        )
+
+        dependencies = {}
+
+        base_label = "release-partner-repack"
+        if "eme" in config.kind:
+            base_label = "release-eme-free-repack"
+        dependencies["build"] = f"{base_label}-{build_platform}"
+        if "macosx" in build_platform or "win" in build_platform:
+            dependencies["repackage"] = "{}-repackage-{}-{}".format(
+                base_label, build_platform, repack_id.replace("/", "-")
+            )
+        dependencies["repackage-signing"] = "{}-repackage-signing-{}-{}".format(
+            base_label, build_platform, repack_id.replace("/", "-")
+        )
+
+        attributes = copy_attributes_from_dependent_job(dep_job)
+
+        task = {
+            "label": label,
+            "description": description,
+            "dependencies": dependencies,
+            "attributes": attributes,
+            "run-on-projects": dep_job.attributes.get("run_on_projects"),
+            "shipping-phase": job["shipping-phase"],
+            "shipping-product": job.get("shipping-product"),
+            "partner-private-path": job["partner-private-path"],
+            "partner-public-path": job["partner-public-path"],
+            "partner-bucket-scope": job["partner-bucket-scope"],
+            "extra": {
+                "repack_id": repack_id,
+            },
+        }
+        # we may have reduced the priority for partner jobs, otherwise task.py will set it
+        if job.get("priority"):
+            task["priority"] = job["priority"]
+
+        yield task
+
+
+def populate_scopes_and_worker_type(config, job, bucket_scope, partner_public=False):
+    action_scope = add_scope_prefix(config, "beetmover:action:push-to-partner")
+
+    task = deepcopy(job)
+    task["scopes"] = [bucket_scope, action_scope]
+    task["worker-type"] = "beetmover"
+    task["partner_public"] = partner_public
+    if partner_public:
+        task["label"] = "{}-public".format(task["label"])
+    return task
+
+
+@transforms.add
+def split_public_and_private(config, jobs):
+    public_bucket_scope = get_beetmover_bucket_scope(config)
+    partner_config = get_partner_config_by_kind(config, config.kind)
+
+    for job in jobs:
+        partner_bucket_scope = add_scope_prefix(config, job["partner-bucket-scope"])
+        partner, subpartner, _ = job["extra"]["repack_id"].split("/")
+
+        if partner_config[partner][subpartner].get("upload_to_candidates"):
+            # public
+            yield populate_scopes_and_worker_type(
+                config, job, public_bucket_scope, partner_public=True
+            )
+        else:
+            # private
+            yield populate_scopes_and_worker_type(
+                config, job, partner_bucket_scope, partner_public=False
+            )
+
+
+def generate_upstream_artifacts(
+    job,
+    build_task_ref,
+    repackage_task_ref,
+    repackage_signing_task_ref,
+    platform,
+    repack_id,
+    partner_path,
+    repack_stub_installer=False,
+):
+
+    upstream_artifacts = []
+    artifact_prefix = get_artifact_prefix(job)
+
+    if "linux" in platform:
+        upstream_artifacts.append(
+            {
+                "taskId": {"task-reference": build_task_ref},
+                "taskType": "build",
+                "paths": [f"{artifact_prefix}/{repack_id}/target.tar.bz2"],
+                "locale": partner_path,
+            }
+        )
+        upstream_artifacts.append(
+            {
+                "taskId": {"task-reference": repackage_signing_task_ref},
+                "taskType": "repackage",
+                "paths": [f"{artifact_prefix}/{repack_id}/target.tar.bz2.asc"],
+                "locale": partner_path,
+            }
+        )
+    elif "macosx" in platform:
+        upstream_artifacts.append(
+            {
+                "taskId": {"task-reference": repackage_task_ref},
+                "taskType": "repackage",
+                "paths": [f"{artifact_prefix}/{repack_id}/target.dmg"],
+                "locale": partner_path,
+            }
+        )
+        upstream_artifacts.append(
+            {
+                "taskId": {"task-reference": repackage_signing_task_ref},
+                "taskType": "repackage",
+                "paths": [f"{artifact_prefix}/{repack_id}/target.dmg.asc"],
+                "locale": partner_path,
+            }
+        )
+    elif "win" in platform:
+        upstream_artifacts.append(
+            {
+                "taskId": {"task-reference": repackage_signing_task_ref},
+                "taskType": "repackage",
+                "paths": [f"{artifact_prefix}/{repack_id}/target.installer.exe"],
+                "locale": partner_path,
+            }
+        )
+        upstream_artifacts.append(
+            {
+                "taskId": {"task-reference": repackage_signing_task_ref},
+                "taskType": "repackage",
+                "paths": [f"{artifact_prefix}/{repack_id}/target.installer.exe.asc"],
+                "locale": partner_path,
+            }
+        )
+        if platform.startswith("win32") and repack_stub_installer:
+            upstream_artifacts.append(
+                {
+                    "taskId": {"task-reference": repackage_signing_task_ref},
+                    "taskType": "repackage",
+                    "paths": [
+                        "{}/{}/target.stub-installer.exe".format(
+                            artifact_prefix, repack_id
+                        )
+                    ],
+                    "locale": partner_path,
+                }
+            )
+            upstream_artifacts.append(
+                {
+                    "taskId": {"task-reference": repackage_signing_task_ref},
+                    "taskType": "repackage",
+                    "paths": [
+                        "{}/{}/target.stub-installer.exe.asc".format(
+                            artifact_prefix, repack_id
+                        )
+                    ],
+                    "locale": partner_path,
+                }
+            )
+
+    if not upstream_artifacts:
+        raise Exception("Couldn't find any upstream artifacts.")
+
+    return upstream_artifacts
+
+
+@transforms.add
+def make_task_worker(config, jobs):
+    for job in jobs:
+        platform = job["attributes"]["build_platform"]
+        repack_id = job["extra"]["repack_id"]
+        partner, subpartner, locale = job["extra"]["repack_id"].split("/")
+        partner_config = get_partner_config_by_kind(config, config.kind)
+        repack_stub_installer = partner_config[partner][subpartner].get(
+            "repack_stub_installer"
+        )
+        build_task = None
+        repackage_task = None
+        repackage_signing_task = None
+
+        for dependency in job["dependencies"].keys():
+            if "repackage-signing" in dependency:
+                repackage_signing_task = dependency
+            elif "repackage" in dependency:
+                repackage_task = dependency
+            else:
+                build_task = "build"
+
+        build_task_ref = "<" + str(build_task) + ">"
+        repackage_task_ref = "<" + str(repackage_task) + ">"
+        repackage_signing_task_ref = "<" + str(repackage_signing_task) + ">"
+
+        # generate the partner path; we'll send this to beetmover as the "locale"
+        ftp_platform = get_ftp_platform(platform)
+        repl_dict = {
+            "build_number": config.params["build_number"],
+            "locale": locale,
+            "partner": partner,
+            "platform": ftp_platform,
+            "release_partner_build_number": config.params[
+                "release_partner_build_number"
+            ],
+            "subpartner": subpartner,
+            "version": config.params["version"],
+        }
+        partner_public = job["partner_public"]
+        if partner_public:
+            partner_path_key = "partner-public-path"
+        else:
+            partner_path_key = "partner-private-path"
+        # Kinds can set these to None
+        if not job[partner_path_key]:
+            continue
+        partner_path = job[partner_path_key].format(**repl_dict)
+        del job["partner_public"]
+        del job["partner-private-path"]
+        del job["partner-public-path"]
+        del job["partner-bucket-scope"]
+
+        worker = {
+            "implementation": "beetmover",
+            "release-properties": craft_release_properties(config, job),
+            "upstream-artifacts": generate_upstream_artifacts(
+                job,
+                build_task_ref,
+                repackage_task_ref,
+                repackage_signing_task_ref,
+                platform,
+                repack_id,
+                partner_path,
+                repack_stub_installer,
+            ),
+            "partner-public": partner_public,
+        }
+        job["worker"] = worker
+
+        yield job
diff --git a/taskcluster/gecko_taskgraph/transforms/beetmover_snap.py b/taskcluster/gecko_taskgraph/transforms/beetmover_snap.py
new file mode 100644
index 0000000000..40f5132cc1
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/beetmover_snap.py
@@ -0,0 +1,42 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+Transform the snap beetmover kind into an actual task description.
+"""
+
+
+from taskgraph.transforms.base import TransformSequence
+
+transforms = TransformSequence()
+
+
+@transforms.add
+def leave_snap_repackage_dependencies_only(config, jobs):
+    for job in jobs:
+        # XXX: We delete the build dependency because, unlike the other beetmover
+        # tasks, source doesn't depend on any build task at all. This hack should
+        # go away when we rewrite beetmover transforms to allow more flexibility in deps
+
+        job["dependencies"] = {
+            key: value
+            for key, value in job["dependencies"].items()
+            if key == "release-snap-repackage"
+        }
+
+        job["worker"]["upstream-artifacts"] = [
+            upstream_artifact
+            for upstream_artifact in job["worker"]["upstream-artifacts"]
+            if upstream_artifact["taskId"]["task-reference"]
+            == "<release-snap-repackage>"
+        ]
+
+        yield job
+
+
+@transforms.add
+def set_custom_treeherder_job_name(config, jobs):
+    for job in jobs:
+        job.get("treeherder", {})["symbol"] = "Snap(BM)"
+
+        yield job
diff --git a/taskcluster/gecko_taskgraph/transforms/beetmover_source.py b/taskcluster/gecko_taskgraph/transforms/beetmover_source.py
new file mode 100644
index 0000000000..573f684a98
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/beetmover_source.py
@@ -0,0 +1,35 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+Transform the beetmover-source task to also append `build` as dependency
+"""
+
+from taskgraph.transforms.base import TransformSequence
+
+transforms = TransformSequence()
+
+
+@transforms.add
+def remove_build_dependency_in_beetmover_source(config, jobs):
+    for job in jobs:
+        # XXX: We delete the build dependency because, unlike the other beetmover
+        # tasks, source doesn't depend on any build task at all. This hack should
+        # go away when we rewrite beetmover transforms to allow more flexibility in deps
+        # Essentially, we should use multi_dep for beetmover.
+        for depname in job["dependencies"]:
+            if "signing" not in depname:
+                del job["dependencies"][depname]
+                break
+        else:
+            raise Exception("Can't find build dep in beetmover source!")
+
+        all_upstream_artifacts = job["worker"]["upstream-artifacts"]
+        upstream_artifacts_without_build = [
+            upstream_artifact
+            for upstream_artifact in all_upstream_artifacts
+            if upstream_artifact["taskId"]["task-reference"] != f"<{depname}>"
+        ]
+        job["worker"]["upstream-artifacts"] = upstream_artifacts_without_build
+
+        yield job
diff --git a/taskcluster/gecko_taskgraph/transforms/beetmover_source_checksums.py b/taskcluster/gecko_taskgraph/transforms/beetmover_source_checksums.py
new file mode 100644
index 0000000000..bcaa889903
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/beetmover_source_checksums.py
@@ -0,0 +1,137 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+Transform release-beetmover-source-checksums into an actual task description.
+"""
+
+from taskgraph.transforms.base import TransformSequence
+from voluptuous import Optional
+
+from gecko_taskgraph.loader.single_dep import schema
+from gecko_taskgraph.transforms.beetmover import craft_release_properties
+from gecko_taskgraph.transforms.task import task_description_schema
+from gecko_taskgraph.util.attributes import copy_attributes_from_dependent_job
+from gecko_taskgraph.util.scriptworker import (
+    generate_beetmover_artifact_map,
+    generate_beetmover_upstream_artifacts,
+    get_beetmover_action_scope,
+    get_beetmover_bucket_scope,
+)
+
+beetmover_checksums_description_schema = schema.extend(
+    {
+        Optional("label"): str,
+        Optional("treeherder"): task_description_schema["treeherder"],
+        Optional("locale"): str,
+        Optional("shipping-phase"): task_description_schema["shipping-phase"],
+        Optional("shipping-product"): task_description_schema["shipping-product"],
+        Optional("attributes"): task_description_schema["attributes"],
+    }
+)
+
+transforms = TransformSequence()
+transforms.add_validate(beetmover_checksums_description_schema)
+
+
+@transforms.add
+def make_beetmover_checksums_description(config, jobs):
+    for job in jobs:
+        dep_job = job["primary-dependency"]
+        attributes = dep_job.attributes
+
+        treeherder = job.get("treeherder", {})
+        treeherder.setdefault("symbol", "BMcss(N)")
+        dep_th_platform = (
+            dep_job.task.get("extra", {})
+            .get("treeherder", {})
+            .get("machine", {})
+            .get("platform", "")
+        )
+        treeherder.setdefault("platform", f"{dep_th_platform}/opt")
+        treeherder.setdefault("tier", 1)
+        treeherder.setdefault("kind", "build")
+
+        label = job["label"]
+        build_platform = attributes.get("build_platform")
+
+        description = "Beetmover submission of checksums for source file"
+
+        extra = {}
+        if "devedition" in build_platform:
+            extra["product"] = "devedition"
+        else:
+            extra["product"] = "firefox"
+
+        dependencies = {dep_job.kind: dep_job.label}
+        for k, v in dep_job.dependencies.items():
+            if k.startswith("beetmover"):
+                dependencies[k] = v
+
+        attributes = copy_attributes_from_dependent_job(dep_job)
+        attributes.update(job.get("attributes", {}))
+
+        bucket_scope = get_beetmover_bucket_scope(config)
+        action_scope = get_beetmover_action_scope(config)
+
+        task = {
+            "label": label,
+            "description": description,
+            "worker-type": "beetmover",
+            "scopes": [bucket_scope, action_scope],
+            "dependencies": dependencies,
+            "attributes": attributes,
+            "run-on-projects": dep_job.attributes.get("run_on_projects"),
+            "treeherder": treeherder,
+            "extra": extra,
+        }
+
+        if "shipping-phase" in job:
+            task["shipping-phase"] = job["shipping-phase"]
+
+        if "shipping-product" in job:
+            task["shipping-product"] = job["shipping-product"]
+
+        yield task
+
+
+@transforms.add
+def make_beetmover_checksums_worker(config, jobs):
+    for job in jobs:
+        valid_beetmover_job = len(job["dependencies"]) == 2
+        if not valid_beetmover_job:
+            raise NotImplementedError("Beetmover checksums must have two dependencies.")
+
+        locale = job["attributes"].get("locale")
+        platform = job["attributes"]["build_platform"]
+
+        refs = {
+            "beetmover": None,
+            "signing": None,
+        }
+        for dependency in job["dependencies"].keys():
+            if dependency.startswith("beetmover"):
+                refs["beetmover"] = f"<{dependency}>"
+            else:
+                refs["signing"] = f"<{dependency}>"
+        if None in refs.values():
+            raise NotImplementedError(
+                "Beetmover checksums must have a beetmover and signing dependency!"
+            )
+
+        worker = {
+            "implementation": "beetmover",
+            "release-properties": craft_release_properties(config, job),
+            "upstream-artifacts": generate_beetmover_upstream_artifacts(
+                config, job, platform, locale
+            ),
+            "artifact-map": generate_beetmover_artifact_map(
+                config, job, platform=platform
+            ),
+        }
+
+        if locale:
+            worker["locale"] = locale
+        job["worker"] = worker
+
+        yield job
diff --git a/taskcluster/gecko_taskgraph/transforms/bootstrap.py b/taskcluster/gecko_taskgraph/transforms/bootstrap.py
new file mode 100644
index 0000000000..e4537cab01
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/bootstrap.py
@@ -0,0 +1,132 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+
+from taskgraph.transforms.base import TransformSequence
+from taskgraph.util.schema import Schema
+from voluptuous import Any, Optional, Required
+
+transforms = TransformSequence()
+
+bootstrap_schema = Schema(
+    {
+        # Name of the bootstrap task.
+        Required("name"): str,
+        # Name of the docker image. Ideally, we'd also have tasks for mac and windows,
+        # but we unfortunately don't have workers barebones enough for such testing
+        # to be satisfactory.
+        Required("image"): Any(str, {"in-tree": str}),
+        # Initialization commands.
+        Required("pre-commands"): [str],
+        # relative path (from config.path) to the file task was defined in
+        Optional("job-from"): str,
+    }
+)
+
+
+transforms.add_validate(bootstrap_schema)
+
+
+@transforms.add
+def bootstrap_tasks(config, tasks):
+    for task in tasks:
+        name = task.pop("name")
+        image = task.pop("image")
+        pre_commands = task.pop("pre-commands")
+
+        head_repo = config.params["head_repository"]
+        head_rev = config.params["head_rev"]
+
+        # Get all the non macos/windows local toolchains (the only ones bootstrap can use),
+        # and use them as dependencies for the tasks we create, so that they don't start
+        # before any potential toolchain task that would be triggered on the same push
+        # (which would lead to bootstrap failing).
+        dependencies = {
+            name: name
+            for name, task in config.kind_dependencies_tasks.items()
+            if task.attributes.get("local-toolchain")
+            and not name.startswith(("toolchain-macos", "toolchain-win"))
+        }
+        # We don't test the artifacts variants, or js, because they are essentially subsets.
+        # Mobile and browser are different enough to warrant testing them separately.
+        for app in ("browser", "mobile_android"):
+            commands = pre_commands + [
+                # MOZ_AUTOMATION changes the behavior, and we want something closer to user
+                # machines.
+                "unset MOZ_AUTOMATION",
+                f"curl -O {head_repo}/raw-file/{head_rev}/python/mozboot/bin/bootstrap.py",
+                f"python3 bootstrap.py --no-interactive --application-choice {app}",
+                "cd mozilla-unified",
+                # After bootstrap, configure should go through without its own auto-bootstrap.
+                "./mach configure --disable-bootstrap",
+                # Then a build should go through too.
+                "./mach build",
+            ]
+
+            os_specific = []
+            if app == "mobile_android":
+                os_specific += ["android*"]
+            for os, filename in (
+                ("debian", "debian.py"),
+                ("ubuntu", "debian.py"),
+                ("fedora", "centosfedora.py"),
+                ("rockylinux", "centosfedora.py"),
+                ("opensuse", "opensuse.py"),
+                ("gentoo", "gentoo.py"),
+                ("archlinux", "archlinux.py"),
+                ("voidlinux", "void.py"),
+            ):
+                if name.startswith(os):
+                    os_specific.append(filename)
+                    break
+            else:
+                raise Exception(f"Missing OS specific bootstrap file for {name}")
+
+            taskdesc = {
+                "label": f"{config.kind}-{name}-{app}",
+                "description": f"Bootstrap {app} build on {name}",
+                "always-target": True,
+                "scopes": [],
+                "treeherder": {
+                    "symbol": f"Boot({name})",
+                    "platform": {
+                        "browser": "linux64/opt",
+                        "mobile_android": "android-5-0-armv7/opt",
+                    }[app],
+                    "kind": "other",
+                    "tier": 2,
+                },
+                "run-on-projects": ["trunk"],
+                "worker-type": "b-linux-gcp",
+                "worker": {
+                    "implementation": "docker-worker",
+                    "docker-image": image,
+                    "os": "linux",
+                    "env": {
+                        "GECKO_HEAD_REPOSITORY": head_repo,
+                        "GECKO_HEAD_REV": head_rev,
+                        "MACH_NO_TERMINAL_FOOTER": "1",
+                        "MOZ_SCM_LEVEL": config.params["level"],
+                    },
+                    "command": ["sh", "-c", "-x", "-e", " && ".join(commands)],
+                    "max-run-time": 7200,
+                },
+                "dependencies": dependencies,
+                "optimization": {
+                    "skip-unless-changed": [
+                        "python/mozboot/bin/bootstrap.py",
+                        "python/mozboot/mozboot/base.py",
+                        "python/mozboot/mozboot/bootstrap.py",
+                        "python/mozboot/mozboot/linux_common.py",
+                        "python/mozboot/mozboot/mach_commands.py",
+                        "python/mozboot/mozboot/mozconfig.py",
+                        "python/mozboot/mozboot/rust.py",
+                        "python/mozboot/mozboot/sccache.py",
+                        "python/mozboot/mozboot/util.py",
+                    ]
+                    + [f"python/mozboot/mozboot/{f}" for f in os_specific]
+                },
+            }
+
+            yield taskdesc
diff --git a/taskcluster/gecko_taskgraph/transforms/bouncer_aliases.py b/taskcluster/gecko_taskgraph/transforms/bouncer_aliases.py
new file mode 100644
index 0000000000..38f1aa136a
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/bouncer_aliases.py
@@ -0,0 +1,108 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+Add from parameters.yml into bouncer submission tasks.
+"""
+
+
+import logging
+
+from taskgraph.transforms.base import TransformSequence
+from taskgraph.util.schema import resolve_keyed_by
+
+from gecko_taskgraph.transforms.bouncer_submission import craft_bouncer_product_name
+from gecko_taskgraph.transforms.bouncer_submission_partners import (
+    craft_partner_bouncer_product_name,
+)
+from gecko_taskgraph.util.attributes import release_level
+from gecko_taskgraph.util.partners import get_partners_to_be_published
+from gecko_taskgraph.util.scriptworker import get_release_config
+
+logger = logging.getLogger(__name__)
+
+transforms = TransformSequence()
+
+
+@transforms.add
+def make_task_worker(config, jobs):
+    for job in jobs:
+        resolve_keyed_by(
+            job,
+            "worker-type",
+            item_name=job["name"],
+            **{"release-level": release_level(config.params["project"])},
+        )
+        resolve_keyed_by(
+            job,
+            "scopes",
+            item_name=job["name"],
+            **{"release-level": release_level(config.params["project"])},
+        )
+        resolve_keyed_by(
+            job,
+            "bouncer-products-per-alias",
+            item_name=job["name"],
+            **{"release-type": config.params["release_type"]},
+        )
+        if "partner-bouncer-products-per-alias" in job:
+            resolve_keyed_by(
+                job,
+                "partner-bouncer-products-per-alias",
+                item_name=job["name"],
+                **{"release-type": config.params["release_type"]},
+            )
+
+        job["worker"]["entries"] = craft_bouncer_entries(config, job)
+
+        del job["bouncer-products-per-alias"]
+        if "partner-bouncer-products-per-alias" in job:
+            del job["partner-bouncer-products-per-alias"]
+
+        if job["worker"]["entries"]:
+            yield job
+        else:
+            logger.warn(
+                'No bouncer entries defined in bouncer submission task for "{}". \
+Job deleted.'.format(
+                    job["name"]
+                )
+            )
+
+
+def craft_bouncer_entries(config, job):
+    release_config = get_release_config(config)
+
+    product = job["shipping-product"]
+    current_version = release_config["version"]
+    bouncer_products_per_alias = job["bouncer-products-per-alias"]
+
+    entries = {
+        bouncer_alias: craft_bouncer_product_name(
+            product,
+            bouncer_product,
+            current_version,
+        )
+        for bouncer_alias, bouncer_product in bouncer_products_per_alias.items()
+    }
+
+    partner_bouncer_products_per_alias = job.get("partner-bouncer-products-per-alias")
+    if partner_bouncer_products_per_alias:
+        partners = get_partners_to_be_published(config)
+        for partner, sub_config_name, _ in partners:
+            entries.update(
+                {
+                    bouncer_alias.replace(
+                        "PARTNER", f"{partner}-{sub_config_name}"
+                    ): craft_partner_bouncer_product_name(
+                        product,
+                        bouncer_product,
+                        current_version,
+                        partner,
+                        sub_config_name,
+                    )
+                    for bouncer_alias, bouncer_product in partner_bouncer_products_per_alias.items()  # NOQA: E501
+                }
+            )
+
+    return entries
diff --git a/taskcluster/gecko_taskgraph/transforms/bouncer_check.py b/taskcluster/gecko_taskgraph/transforms/bouncer_check.py
new file mode 100644
index 0000000000..9261ef9463
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/bouncer_check.py
@@ -0,0 +1,111 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import json
+import logging
+from pipes import quote as shell_quote
+
+from taskgraph.transforms.base import TransformSequence
+from taskgraph.util.schema import resolve_keyed_by
+
+from gecko_taskgraph.util.attributes import release_level
+from gecko_taskgraph.util.scriptworker import get_release_config
+
+logger = logging.getLogger(__name__)
+
+transforms = TransformSequence()
+
+
+@transforms.add
+def add_command(config, jobs):
+    for job in jobs:
+        command = [
+            "python",
+            "testing/mozharness/scripts/release/bouncer_check.py",
+        ]
+        job["run"].update(
+            {
+                "using": "mach",
+                "mach": command,
+            }
+        )
+        yield job
+
+
+@transforms.add
+def add_previous_versions(config, jobs):
+    release_config = get_release_config(config)
+    if not release_config.get("partial_versions"):
+        for job in jobs:
+            yield job
+    else:
+        extra_params = []
+        for partial in release_config["partial_versions"].split(","):
+            extra_params.append(
+                "--previous-version={}".format(partial.split("build")[0].strip())
+            )
+
+        for job in jobs:
+            job["run"]["mach"].extend(extra_params)
+            yield job
+
+
+@transforms.add
+def handle_keyed_by(config, jobs):
+    """Resolve fields that can be keyed by project, etc."""
+    fields = [
+        "run.config",
+        "run.product-field",
+        "run.extra-config",
+    ]
+
+    release_config = get_release_config(config)
+    version = release_config["version"]
+
+    for job in jobs:
+        for field in fields:
+            resolve_keyed_by(
+                item=job,
+                field=field,
+                item_name=job["name"],
+                **{
+                    "project": config.params["project"],
+                    "release-level": release_level(config.params["project"]),
+                    "release-type": config.params["release_type"],
+                },
+            )
+
+        for cfg in job["run"]["config"]:
+            job["run"]["mach"].extend(["--config", cfg])
+
+        if config.kind == "cron-bouncer-check":
+            job["run"]["mach"].extend(
+                [
+                    "--product-field={}".format(job["run"]["product-field"]),
+                    "--products-url={}".format(job["run"]["products-url"]),
+                ]
+            )
+            del job["run"]["product-field"]
+            del job["run"]["products-url"]
+        elif config.kind == "release-bouncer-check":
+            job["run"]["mach"].append(f"--version={version}")
+
+        del job["run"]["config"]
+
+        if "extra-config" in job["run"]:
+            env = job["worker"].setdefault("env", {})
+            env["EXTRA_MOZHARNESS_CONFIG"] = json.dumps(
+                job["run"]["extra-config"], sort_keys=True
+            )
+            del job["run"]["extra-config"]
+
+        yield job
+
+
+@transforms.add
+def command_to_string(config, jobs):
+    """Convert command to string to make it work properly with run-task"""
+    for job in jobs:
+        job["run"]["mach"] = " ".join(map(shell_quote, job["run"]["mach"]))
+        yield job
diff --git a/taskcluster/gecko_taskgraph/transforms/bouncer_locations.py b/taskcluster/gecko_taskgraph/transforms/bouncer_locations.py
new file mode 100644
index 0000000000..e755b73c27
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/bouncer_locations.py
@@ -0,0 +1,35 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import logging
+
+from taskgraph.transforms.base import TransformSequence
+from taskgraph.util.schema import resolve_keyed_by
+
+logger = logging.getLogger(__name__)
+
+
+transforms = TransformSequence()
+
+
+@transforms.add
+def make_task_worker(config, jobs):
+    for job in jobs:
+        resolve_keyed_by(
+            job, "worker-type", item_name=job["name"], project=config.params["project"]
+        )
+        resolve_keyed_by(
+            job, "scopes", item_name=job["name"], project=config.params["project"]
+        )
+        resolve_keyed_by(
+            job,
+            "bouncer-products",
+            item_name=job["name"],
+            project=config.params["project"],
+        )
+
+        job["worker"]["bouncer-products"] = job["bouncer-products"]
+
+        del job["bouncer-products"]
+        yield job
diff --git a/taskcluster/gecko_taskgraph/transforms/bouncer_submission.py b/taskcluster/gecko_taskgraph/transforms/bouncer_submission.py
new file mode 100644
index 0000000000..d6320a9312
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/bouncer_submission.py
@@ -0,0 +1,335 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+Add from parameters.yml into bouncer submission tasks.
+"""
+
+
+import copy
+import logging
+
+import attr
+from taskgraph.transforms.base import TransformSequence
+from taskgraph.util.schema import resolve_keyed_by
+
+from gecko_taskgraph.transforms.l10n import parse_locales_file
+from gecko_taskgraph.util.attributes import release_level
+from gecko_taskgraph.util.scriptworker import get_release_config
+
+logger = logging.getLogger(__name__)
+
+
+FTP_PLATFORMS_PER_BOUNCER_PLATFORM = {
+    "linux": "linux-i686",
+    "linux64": "linux-x86_64",
+    "osx": "mac",
+    "win": "win32",
+    "win64": "win64",
+    "win64-aarch64": "win64-aarch64",
+}
+
+# :lang is interpolated by bouncer at runtime
+CANDIDATES_PATH_TEMPLATE = "/{ftp_product}/candidates/{version}-candidates/build{build_number}/\
+{update_folder}{ftp_platform}/:lang/{file}"
+RELEASES_PATH_TEMPLATE = "/{ftp_product}/releases/{version}/\
+{update_folder}{ftp_platform}/:lang/{file}"
+
+
+CONFIG_PER_BOUNCER_PRODUCT = {
+    "complete-mar": {
+        "name_postfix": "-Complete",
+        "path_template": RELEASES_PATH_TEMPLATE,
+        "file_names": {
+            "default": "{product}-{version}.complete.mar",
+        },
+    },
+    "complete-mar-candidates": {
+        "name_postfix": "build{build_number}-Complete",
+        "path_template": CANDIDATES_PATH_TEMPLATE,
+        "file_names": {
+            "default": "{product}-{version}.complete.mar",
+        },
+    },
+    "installer": {
+        "path_template": RELEASES_PATH_TEMPLATE,
+        "file_names": {
+            "linux": "{product}-{version}.tar.bz2",
+            "linux64": "{product}-{version}.tar.bz2",
+            "osx": "{pretty_product}%20{version}.dmg",
+            "win": "{pretty_product}%20Setup%20{version}.exe",
+            "win64": "{pretty_product}%20Setup%20{version}.exe",
+            "win64-aarch64": "{pretty_product}%20Setup%20{version}.exe",
+        },
+    },
+    "partial-mar": {
+        "name_postfix": "-Partial-{previous_version}",
+        "path_template": RELEASES_PATH_TEMPLATE,
+        "file_names": {
+            "default": "{product}-{previous_version}-{version}.partial.mar",
+        },
+    },
+    "partial-mar-candidates": {
+        "name_postfix": "build{build_number}-Partial-{previous_version}build{previous_build}",
+        "path_template": CANDIDATES_PATH_TEMPLATE,
+        "file_names": {
+            "default": "{product}-{previous_version}-{version}.partial.mar",
+        },
+    },
+    "stub-installer": {
+        "name_postfix": "-stub",
+        # We currently have a sole win32 stub installer that is to be used
+        # in all windows platforms to toggle between full installers
+        "path_template": RELEASES_PATH_TEMPLATE.replace("{ftp_platform}", "win32"),
+        "file_names": {
+            "win": "{pretty_product}%20Installer.exe",
+            "win64": "{pretty_product}%20Installer.exe",
+            "win64-aarch64": "{pretty_product}%20Installer.exe",
+        },
+    },
+    "msi": {
+        "name_postfix": "-msi-SSL",
+        "path_template": RELEASES_PATH_TEMPLATE,
+        "file_names": {
+            "win": "{pretty_product}%20Setup%20{version}.msi",
+            "win64": "{pretty_product}%20Setup%20{version}.msi",
+        },
+    },
+    "msix": {
+        "name_postfix": "-msix-SSL",
+        "path_template": RELEASES_PATH_TEMPLATE.replace(":lang", "multi"),
+        "file_names": {
+            "win": "{pretty_product}%20Setup%20{version}.msix",
+            "win64": "{pretty_product}%20Setup%20{version}.msix",
+        },
+    },
+    "pkg": {
+        "name_postfix": "-pkg-SSL",
+        "path_template": RELEASES_PATH_TEMPLATE,
+        "file_names": {
+            "osx": "{pretty_product}%20{version}.pkg",
+        },
+    },
+    "langpack": {
+        "name_postfix": "-langpack-SSL",
+        "path_template": RELEASES_PATH_TEMPLATE.replace(":lang", "xpi"),
+        "file_names": {"default": ":lang.xpi"},
+    },
+}
+CONFIG_PER_BOUNCER_PRODUCT["installer-ssl"] = copy.deepcopy(
+    CONFIG_PER_BOUNCER_PRODUCT["installer"]
+)
+CONFIG_PER_BOUNCER_PRODUCT["installer-ssl"]["name_postfix"] = "-SSL"
+
+transforms = TransformSequence()
+
+
+@transforms.add
+def make_task_worker(config, jobs):
+    for job in jobs:
+        resolve_keyed_by(
+            job,
+            "worker-type",
+            item_name=job["name"],
+            **{"release-level": release_level(config.params["project"])}
+        )
+        resolve_keyed_by(
+            job,
+            "scopes",
+            item_name=job["name"],
+            **{"release-level": release_level(config.params["project"])}
+        )
+        resolve_keyed_by(
+            job,
+            "bouncer-products",
+            item_name=job["name"],
+            **{"release-type": config.params["release_type"]}
+        )
+
+        # No need to filter out ja-JP-mac, we need to upload both; but we do
+        # need to filter out the platforms they come with
+        all_locales = sorted(
+            locale
+            for locale in parse_locales_file(job["locales-file"]).keys()
+            if locale not in ("linux", "win32", "osx")
+        )
+
+        job["worker"]["locales"] = all_locales
+        job["worker"]["entries"] = craft_bouncer_entries(config, job)
+
+        del job["locales-file"]
+        del job["bouncer-platforms"]
+        del job["bouncer-products"]
+
+        if job["worker"]["entries"]:
+            yield job
+        else:
+            logger.warn(
+                'No bouncer entries defined in bouncer submission task for "{}". \
+Job deleted.'.format(
+                    job["name"]
+                )
+            )
+
+
+def craft_bouncer_entries(config, job):
+    release_config = get_release_config(config)
+
+    product = job["shipping-product"]
+    bouncer_platforms = job["bouncer-platforms"]
+
+    current_version = release_config["version"]
+    current_build_number = release_config["build_number"]
+
+    bouncer_products = job["bouncer-products"]
+    previous_versions_string = release_config.get("partial_versions", None)
+    if previous_versions_string:
+        previous_versions = previous_versions_string.split(", ")
+    else:
+        logger.warn(
+            'No partials defined! Bouncer submission task won\'t send any \
+partial-related entry for "{}"'.format(
+                job["name"]
+            )
+        )
+        bouncer_products = [
+            bouncer_product
+            for bouncer_product in bouncer_products
+            if "partial" not in bouncer_product
+        ]
+        previous_versions = [None]
+
+    project = config.params["project"]
+
+    return {
+        craft_bouncer_product_name(
+            product,
+            bouncer_product,
+            current_version,
+            current_build_number,
+            previous_version,
+        ): {
+            "options": {
+                "add_locales": False if "msix" in bouncer_product else True,
+                "ssl_only": craft_ssl_only(bouncer_product, project),
+            },
+            "paths_per_bouncer_platform": craft_paths_per_bouncer_platform(
+                product,
+                bouncer_product,
+                bouncer_platforms,
+                current_version,
+                current_build_number,
+                previous_version,
+            ),
+        }
+        for bouncer_product in bouncer_products
+        for previous_version in previous_versions
+    }
+
+
+def craft_paths_per_bouncer_platform(
+    product,
+    bouncer_product,
+    bouncer_platforms,
+    current_version,
+    current_build_number,
+    previous_version=None,
+):
+    paths_per_bouncer_platform = {}
+    for bouncer_platform in bouncer_platforms:
+        file_names_per_platform = CONFIG_PER_BOUNCER_PRODUCT[bouncer_product][
+            "file_names"
+        ]
+        file_name_template = file_names_per_platform.get(
+            bouncer_platform, file_names_per_platform.get("default", None)
+        )
+        if not file_name_template:
+            # Some bouncer product like stub-installer are only meant to be on Windows.
+            # Thus no default value is defined there
+            continue
+
+        file_name_product = _craft_filename_product(product)
+        file_name = file_name_template.format(
+            product=file_name_product,
+            pretty_product=file_name_product.capitalize(),
+            version=current_version,
+            previous_version=split_build_data(previous_version)[0],
+        )
+
+        path_template = CONFIG_PER_BOUNCER_PRODUCT[bouncer_product]["path_template"]
+        file_relative_location = path_template.format(
+            ftp_product=_craft_ftp_product(product),
+            version=current_version,
+            build_number=current_build_number,
+            update_folder="update/" if "-mar" in bouncer_product else "",
+            ftp_platform=FTP_PLATFORMS_PER_BOUNCER_PLATFORM[bouncer_platform],
+            file=file_name,
+        )
+
+        paths_per_bouncer_platform[bouncer_platform] = file_relative_location
+
+    return paths_per_bouncer_platform
+
+
+def _craft_ftp_product(product):
+    return product.lower()
+
+
+def _craft_filename_product(product):
+    return "firefox" if product == "devedition" else product
+
+
+@attr.s
+class InvalidSubstitution:
+    error = attr.ib(type=str)
+
+    def __str__(self):
+        raise Exception("Partial is being processed, but no previous version defined.")
+
+
+def craft_bouncer_product_name(
+    product,
+    bouncer_product,
+    current_version,
+    current_build_number=None,
+    previous_version=None,
+):
+    if previous_version is None:
+        previous_version = previous_build = InvalidSubstitution(
+            "Partial is being processed, but no previous version defined."
+        )
+    else:
+        previous_version, previous_build = split_build_data(previous_version)
+    postfix = (
+        CONFIG_PER_BOUNCER_PRODUCT[bouncer_product]
+        .get("name_postfix", "")
+        .format(
+            build_number=current_build_number,
+            previous_version=previous_version,
+            previous_build=previous_build,
+        )
+    )
+
+    return "{product}-{version}{postfix}".format(
+        product=product.capitalize(), version=current_version, postfix=postfix
+    )
+
+
+def craft_ssl_only(bouncer_product, project):
+    # XXX ESR is the only channel where we force serve the installer over SSL
+    if "-esr" in project and bouncer_product == "installer":
+        return True
+
+    return bouncer_product not in (
+        "complete-mar",
+        "complete-mar-candidates",
+        "installer",
+        "partial-mar",
+        "partial-mar-candidates",
+    )
+
+
+def split_build_data(version):
+    if version and "build" in version:
+        return version.split("build")
+    return version, InvalidSubstitution("k")
diff --git a/taskcluster/gecko_taskgraph/transforms/bouncer_submission_partners.py b/taskcluster/gecko_taskgraph/transforms/bouncer_submission_partners.py
new file mode 100644
index 0000000000..0f298cb120
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/bouncer_submission_partners.py
@@ -0,0 +1,193 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+Add from parameters.yml into bouncer submission tasks.
+"""
+
+
+import logging
+
+from taskgraph.transforms.base import TransformSequence
+from taskgraph.util.schema import resolve_keyed_by
+
+from gecko_taskgraph.transforms.bouncer_submission import (
+    CONFIG_PER_BOUNCER_PRODUCT as CONFIG_PER_BOUNCER_PRODUCT_VANILLA,
+)
+from gecko_taskgraph.transforms.bouncer_submission import (
+    FTP_PLATFORMS_PER_BOUNCER_PLATFORM,
+    _craft_filename_product,
+    _craft_ftp_product,
+)
+from gecko_taskgraph.util.attributes import release_level
+from gecko_taskgraph.util.partners import (
+    check_if_partners_enabled,
+    get_partners_to_be_published,
+)
+from gecko_taskgraph.util.scriptworker import get_release_config
+
+logger = logging.getLogger(__name__)
+
+
+PARTNER_PLATFORMS_TO_BOUNCER = {
+    "linux-shippable": "linux",
+    "linux64-shippable": "linux64",
+    "macosx64-shippable": "osx",
+    "win32-shippable": "win",
+    "win64-shippable": "win64",
+    "win64-aarch64-shippable": "win64-aarch64",
+}
+
+# :lang is interpolated by bouncer at runtime
+RELEASES_PARTNERS_PATH_TEMPLATE = "/{ftp_product}/releases/partners/{partner}/{sub_config}/\
+{version}/{ftp_platform}/:lang/{file}"
+
+CONFIG_PER_BOUNCER_PRODUCT = {
+    "installer": {
+        "name_postfix": "-{partner}-{sub_config}",
+        "path_template": RELEASES_PARTNERS_PATH_TEMPLATE,
+        "file_names": CONFIG_PER_BOUNCER_PRODUCT_VANILLA["installer"]["file_names"],
+    },
+    "stub-installer": {
+        "name_postfix": "-{partner}-{sub_config}-stub",
+        # We currently have a sole win32 stub installer that is to be used
+        # in all windows platforms to toggle between full installers
+        "path_template": RELEASES_PARTNERS_PATH_TEMPLATE.replace(
+            "{ftp_platform}", "win32"
+        ),
+        "file_names": CONFIG_PER_BOUNCER_PRODUCT_VANILLA["stub-installer"][
+            "file_names"
+        ],
+    },
+}
+
+transforms = TransformSequence()
+transforms.add(check_if_partners_enabled)
+
+
+@transforms.add
+def make_task_worker(config, jobs):
+    for job in jobs:
+        resolve_keyed_by(
+            job,
+            "worker-type",
+            item_name=job["name"],
+            **{"release-level": release_level(config.params["project"])}
+        )
+        resolve_keyed_by(
+            job,
+            "scopes",
+            item_name=job["name"],
+            **{"release-level": release_level(config.params["project"])}
+        )
+        resolve_keyed_by(
+            job,
+            "bouncer-products",
+            item_name=job["name"],
+            **{"release-type": config.params["release_type"]}
+        )
+
+        # the schema requires at least one locale but this will not be used
+        job["worker"]["locales"] = ["fake"]
+        job["worker"]["entries"] = craft_bouncer_entries(config, job)
+
+        del job["locales-file"]
+        del job["bouncer-platforms"]
+        del job["bouncer-products"]
+
+        if job["worker"]["entries"]:
+            yield job
+
+
+def craft_bouncer_entries(config, job):
+    release_config = get_release_config(config)
+
+    product = job["shipping-product"]
+    current_version = release_config["version"]
+    bouncer_products = job["bouncer-products"]
+
+    partners = get_partners_to_be_published(config)
+    entries = {}
+    for partner, sub_config_name, platforms in partners:
+        platforms = [PARTNER_PLATFORMS_TO_BOUNCER[p] for p in platforms]
+        entries.update(
+            {
+                craft_partner_bouncer_product_name(
+                    product, bouncer_product, current_version, partner, sub_config_name
+                ): {
+                    "options": {
+                        "add_locales": False,  # partners may use different sets of locales
+                        "ssl_only": craft_ssl_only(bouncer_product),
+                    },
+                    "paths_per_bouncer_platform": craft_paths_per_bouncer_platform(
+                        product,
+                        bouncer_product,
+                        platforms,
+                        current_version,
+                        partner,
+                        sub_config_name,
+                    ),
+                }
+                for bouncer_product in bouncer_products
+            }
+        )
+    return entries
+
+
+def craft_paths_per_bouncer_platform(
+    product, bouncer_product, bouncer_platforms, current_version, partner, sub_config
+):
+    paths_per_bouncer_platform = {}
+    for bouncer_platform in bouncer_platforms:
+        file_names_per_platform = CONFIG_PER_BOUNCER_PRODUCT[bouncer_product][
+            "file_names"
+        ]
+        file_name_template = file_names_per_platform.get(
+            bouncer_platform, file_names_per_platform.get("default", None)
+        )
+        if not file_name_template:
+            # Some bouncer product like stub-installer are only meant to be on Windows.
+            # Thus no default value is defined there
+            continue
+
+        file_name_product = _craft_filename_product(product)
+        file_name = file_name_template.format(
+            product=file_name_product,
+            pretty_product=file_name_product.capitalize(),
+            version=current_version,
+        )
+
+        path_template = CONFIG_PER_BOUNCER_PRODUCT[bouncer_product]["path_template"]
+        file_relative_location = path_template.format(
+            ftp_product=_craft_ftp_product(product),
+            version=current_version,
+            ftp_platform=FTP_PLATFORMS_PER_BOUNCER_PLATFORM[bouncer_platform],
+            partner=partner,
+            sub_config=sub_config,
+            file=file_name,
+        )
+
+        paths_per_bouncer_platform[bouncer_platform] = file_relative_location
+
+    return paths_per_bouncer_platform
+
+
+def craft_partner_bouncer_product_name(
+    product, bouncer_product, current_version, partner, sub_config
+):
+    postfix = (
+        CONFIG_PER_BOUNCER_PRODUCT[bouncer_product]
+        .get("name_postfix", "")
+        .format(
+            partner=partner,
+            sub_config=sub_config,
+        )
+    )
+
+    return "{product}-{version}{postfix}".format(
+        product=product.capitalize(), version=current_version, postfix=postfix
+    )
+
+
+def craft_ssl_only(bouncer_product):
+    return bouncer_product == "stub-installer"
diff --git a/taskcluster/gecko_taskgraph/transforms/build.py b/taskcluster/gecko_taskgraph/transforms/build.py
new file mode 100644
index 0000000000..94a4d71b0b
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/build.py
@@ -0,0 +1,238 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+Apply some defaults and minor modifications to the jobs defined in the build
+kind.
+"""
+import logging
+
+from mozbuild.artifact_builds import JOB_CHOICES as ARTIFACT_JOBS
+from taskgraph.transforms.base import TransformSequence
+from taskgraph.util.schema import resolve_keyed_by
+from taskgraph.util.treeherder import add_suffix
+
+from gecko_taskgraph.util.attributes import RELEASE_PROJECTS, is_try, release_level
+from gecko_taskgraph.util.workertypes import worker_type_implementation
+
+logger = logging.getLogger(__name__)
+
+transforms = TransformSequence()
+
+
+@transforms.add
+def set_defaults(config, jobs):
+    """Set defaults, including those that differ per worker implementation"""
+    for job in jobs:
+        job["treeherder"].setdefault("kind", "build")
+        job["treeherder"].setdefault("tier", 1)
+        _, worker_os = worker_type_implementation(
+            config.graph_config, config.params, job["worker-type"]
+        )
+        worker = job.setdefault("worker", {})
+        worker.setdefault("env", {})
+        worker["chain-of-trust"] = True
+        if worker_os == "linux":
+            worker.setdefault("docker-image", {"in-tree": "debian11-amd64-build"})
+
+        yield job
+
+
+@transforms.add
+def stub_installer(config, jobs):
+    for job in jobs:
+        resolve_keyed_by(
+            job,
+            "stub-installer",
+            item_name=job["name"],
+            project=config.params["project"],
+            **{
+                "release-type": config.params["release_type"],
+            },
+        )
+        job.setdefault("attributes", {})
+        if job.get("stub-installer"):
+            job["attributes"]["stub-installer"] = job["stub-installer"]
+            job["worker"]["env"].update({"USE_STUB_INSTALLER": "1"})
+        if "stub-installer" in job:
+            del job["stub-installer"]
+        yield job
+
+
+@transforms.add
+def resolve_shipping_product(config, jobs):
+    for job in jobs:
+        resolve_keyed_by(
+            job,
+            "shipping-product",
+            item_name=job["name"],
+            **{
+                "release-type": config.params["release_type"],
+            },
+        )
+        yield job
+
+
+@transforms.add
+def update_channel(config, jobs):
+    keys = [
+        "run.update-channel",
+        "run.mar-channel-id",
+        "run.accepted-mar-channel-ids",
+    ]
+    for job in jobs:
+        job["worker"].setdefault("env", {})
+        for key in keys:
+            resolve_keyed_by(
+                job,
+                key,
+                item_name=job["name"],
+                **{
+                    "project": config.params["project"],
+                    "release-type": config.params["release_type"],
+                },
+            )
+        update_channel = job["run"].pop("update-channel", None)
+        if update_channel:
+            job["run"].setdefault("extra-config", {})["update_channel"] = update_channel
+            job["attributes"]["update-channel"] = update_channel
+        mar_channel_id = job["run"].pop("mar-channel-id", None)
+        if mar_channel_id:
+            job["attributes"]["mar-channel-id"] = mar_channel_id
+            job["worker"]["env"]["MAR_CHANNEL_ID"] = mar_channel_id
+        accepted_mar_channel_ids = job["run"].pop("accepted-mar-channel-ids", None)
+        if accepted_mar_channel_ids:
+            job["attributes"]["accepted-mar-channel-ids"] = accepted_mar_channel_ids
+            job["worker"]["env"]["ACCEPTED_MAR_CHANNEL_IDS"] = accepted_mar_channel_ids
+
+        yield job
+
+
+@transforms.add
+def mozconfig(config, jobs):
+    for job in jobs:
+        resolve_keyed_by(
+            job,
+            "run.mozconfig-variant",
+            item_name=job["name"],
+            **{
+                "release-type": config.params["release_type"],
+            },
+        )
+        mozconfig_variant = job["run"].pop("mozconfig-variant", None)
+        if mozconfig_variant:
+            job["run"].setdefault("extra-config", {})[
+                "mozconfig_variant"
+            ] = mozconfig_variant
+        yield job
+
+
+@transforms.add
+def use_artifact(config, jobs):
+    if is_try(config.params):
+        use_artifact = config.params["try_task_config"].get(
+            "use-artifact-builds", False
+        )
+    else:
+        use_artifact = False
+    for job in jobs:
+        if (
+            config.kind == "build"
+            and use_artifact
+            and job.get("index", {}).get("job-name") in ARTIFACT_JOBS
+            # If tests aren't packaged, then we are not able to rebuild all the packages
+            and job["worker"]["env"].get("MOZ_AUTOMATION_PACKAGE_TESTS") == "1"
+        ):
+            job["treeherder"]["symbol"] = add_suffix(job["treeherder"]["symbol"], "a")
+            job["worker"]["env"]["USE_ARTIFACT"] = "1"
+            job["attributes"]["artifact-build"] = True
+        yield job
+
+
+@transforms.add
+def use_profile_data(config, jobs):
+    for job in jobs:
+        use_pgo = job.pop("use-pgo", False)
+        disable_pgo = config.params["try_task_config"].get("disable-pgo", False)
+        artifact_build = job["attributes"].get("artifact-build")
+        if not use_pgo or disable_pgo or artifact_build:
+            yield job
+            continue
+
+        # If use_pgo is True, the task uses the generate-profile task of the
+        # same name. Otherwise a task can specify a specific generate-profile
+        # task to use in the use_pgo field.
+        if use_pgo is True:
+            name = job["name"]
+        else:
+            name = use_pgo
+        dependencies = f"generate-profile-{name}"
+        job.setdefault("dependencies", {})["generate-profile"] = dependencies
+        job.setdefault("fetches", {})["generate-profile"] = ["profdata.tar.xz"]
+        job["worker"]["env"].update({"TASKCLUSTER_PGO_PROFILE_USE": "1"})
+
+        _, worker_os = worker_type_implementation(
+            config.graph_config, config.params, job["worker-type"]
+        )
+        if worker_os == "linux":
+            # LTO linkage needs more open files than the default from run-task.
+            job["worker"]["env"].update({"MOZ_LIMIT_NOFILE": "8192"})
+
+        if job.get("use-sccache"):
+            raise Exception(
+                "use-sccache is incompatible with use-pgo in {}".format(job["name"])
+            )
+
+        yield job
+
+
+@transforms.add
+def resolve_keys(config, jobs):
+    for job in jobs:
+        resolve_keyed_by(
+            job,
+            "use-sccache",
+            item_name=job["name"],
+            **{"release-level": release_level(config.params["project"])},
+        )
+        yield job
+
+
+@transforms.add
+def enable_full_crashsymbols(config, jobs):
+    """Enable full crashsymbols on jobs with
+    'enable-full-crashsymbols' set to True and on release branches, or
+    on try"""
+    branches = RELEASE_PROJECTS | {
+        "toolchains",
+        "try",
+    }
+    for job in jobs:
+        enable_full_crashsymbols = job["attributes"].get("enable-full-crashsymbols")
+        if enable_full_crashsymbols and config.params["project"] in branches:
+            logger.debug("Enabling full symbol generation for %s", job["name"])
+            job["worker"]["env"]["MOZ_ENABLE_FULL_SYMBOLS"] = "1"
+        else:
+            logger.debug("Disabling full symbol generation for %s", job["name"])
+            job["attributes"].pop("enable-full-crashsymbols", None)
+        yield job
+
+
+@transforms.add
+def set_expiry(config, jobs):
+    for job in jobs:
+        attributes = job["attributes"]
+        if (
+            "shippable" in attributes
+            and attributes["shippable"]
+            and config.kind
+            in {
+                "build",
+            }
+        ):
+            expiration_policy = "long"
+        else:
+            expiration_policy = "medium"
+
+        job["expiration-policy"] = expiration_policy
+        yield job
diff --git a/taskcluster/gecko_taskgraph/transforms/build_attrs.py b/taskcluster/gecko_taskgraph/transforms/build_attrs.py
new file mode 100644
index 0000000000..9cda71718a
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/build_attrs.py
@@ -0,0 +1,50 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+from taskgraph.transforms.base import TransformSequence
+
+from gecko_taskgraph.util.platforms import platform_family
+
+transforms = TransformSequence()
+
+
+@transforms.add
+def set_build_attributes(config, jobs):
+    """
+    Set the build_platform and build_type attributes based on the job name.
+    Although not all jobs using this transform are actual "builds", the try
+    option syntax treats them as such, and this arranges the attributes
+    appropriately for that purpose.
+    """
+    for job in jobs:
+        build_platform, build_type = job["name"].split("/")
+
+        # pgo builds are represented as a different platform, type opt
+        if build_type == "pgo":
+            build_platform = build_platform + "-pgo"
+            build_type = "opt"
+
+        attributes = job.setdefault("attributes", {})
+        attributes.update(
+            {
+                "build_platform": build_platform,
+                "build_type": build_type,
+            }
+        )
+
+        yield job
+
+
+@transforms.add
+def set_schedules_optimization(config, jobs):
+    """Set the `skip-unless-affected` optimization based on the build platform."""
+    for job in jobs:
+        # don't add skip-unless-schedules if there's already a when defined
+        if "when" in job:
+            yield job
+            continue
+
+        build_platform = job["attributes"]["build_platform"]
+        job.setdefault("optimization", {"build": [platform_family(build_platform)]})
+        yield job
diff --git a/taskcluster/gecko_taskgraph/transforms/build_fat_aar.py b/taskcluster/gecko_taskgraph/transforms/build_fat_aar.py
new file mode 100644
index 0000000000..61df2111d2
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/build_fat_aar.py
@@ -0,0 +1,78 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+
+import copy
+
+from taskgraph.transforms.base import TransformSequence
+from taskgraph.util.taskcluster import get_artifact_prefix
+
+from gecko_taskgraph.util.declarative_artifacts import get_geckoview_upstream_artifacts
+
+transforms = TransformSequence()
+
+
+MOZ_ANDROID_FAT_AAR_ENV_MAP = {
+    "android-arm-shippable": "MOZ_ANDROID_FAT_AAR_ARMEABI_V7A",
+    "android-arm-shippable-lite": "MOZ_ANDROID_FAT_AAR_ARMEABI_V7A",
+    "android-aarch64-shippable": "MOZ_ANDROID_FAT_AAR_ARM64_V8A",
+    "android-aarch64-shippable-lite": "MOZ_ANDROID_FAT_AAR_ARM64_V8A",
+    "android-x86-shippable": "MOZ_ANDROID_FAT_AAR_X86",
+    "android-x86-shippable-lite": "MOZ_ANDROID_FAT_AAR_X86",
+    "android-x86_64-shippable": "MOZ_ANDROID_FAT_AAR_X86_64",
+    "android-x86_64-shippable-lite": "MOZ_ANDROID_FAT_AAR_X86_64",
+    "android-arm-opt": "MOZ_ANDROID_FAT_AAR_ARMEABI_V7A",
+    "android-aarch64-opt": "MOZ_ANDROID_FAT_AAR_ARM64_V8A",
+    "android-x86-opt": "MOZ_ANDROID_FAT_AAR_X86",
+    "android-x86_64-opt": "MOZ_ANDROID_FAT_AAR_X86_64",
+}
+
+
+@transforms.add
+def set_fetches_and_locations(config, jobs):
+    """Set defaults, including those that differ per worker implementation"""
+    for job in jobs:
+        dependencies = copy.deepcopy(job["dependencies"])
+
+        for platform, label in dependencies.items():
+            job["dependencies"] = {"build": label}
+
+            aar_location = _get_aar_location(config, job, platform)
+            prefix = get_artifact_prefix(job)
+            if not prefix.endswith("/"):
+                prefix = prefix + "/"
+            if aar_location.startswith(prefix):
+                aar_location = aar_location[len(prefix) :]
+
+            job.setdefault("fetches", {}).setdefault(platform, []).append(
+                {
+                    "artifact": aar_location,
+                    "extract": False,
+                }
+            )
+
+            aar_file_name = aar_location.split("/")[-1]
+            env_var = MOZ_ANDROID_FAT_AAR_ENV_MAP[platform]
+            job["worker"]["env"][env_var] = aar_file_name
+
+        job["dependencies"] = dependencies
+
+        yield job
+
+
+def _get_aar_location(config, job, platform):
+    artifacts_locations = []
+
+    for package in job["attributes"]["maven_packages"]:
+        artifacts_locations += get_geckoview_upstream_artifacts(
+            config, job, package, platform=platform
+        )
+
+    aar_locations = [
+        path for path in artifacts_locations[0]["paths"] if path.endswith(".aar")
+    ]
+    if len(aar_locations) != 1:
+        raise ValueError(f"Only a single AAR must be given. Got: {aar_locations}")
+
+    return aar_locations[0]
diff --git a/taskcluster/gecko_taskgraph/transforms/build_lints.py b/taskcluster/gecko_taskgraph/transforms/build_lints.py
new file mode 100644
index 0000000000..d1bd276059
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/build_lints.py
@@ -0,0 +1,59 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+Apply some defaults and minor modifications to the jobs defined in the build
+kind.
+"""
+
+from taskgraph.transforms.base import TransformSequence
+
+transforms = TransformSequence()
+
+
+@transforms.add
+def check_mozharness_perfherder_options(config, jobs):
+    """Verify that multiple jobs don't use the same perfherder bucket.
+
+    Build jobs record perfherder metrics by default. Perfherder metrics go
+    to a bucket derived by the platform by default. The name can further be
+    customized by the presence of "extra options" either defined in
+    mozharness sub-configs or in an environment variable.
+
+    This linter tries to verify that no 2 jobs will send Perfherder metrics
+    to the same bucket by looking for jobs not defining extra options when
+    their platform or mozharness config are otherwise similar.
+    """
+
+    SEEN_CONFIGS = {}
+
+    for job in jobs:
+        if job["run"]["using"] != "mozharness":
+            yield job
+            continue
+
+        worker = job.get("worker", {})
+
+        platform = job["treeherder"]["platform"]
+        primary_config = job["run"]["config"][0]
+        options = worker.get("env", {}).get("PERFHERDER_EXTRA_OPTIONS")
+        shippable = job.get("attributes", {}).get("shippable", False)
+
+        # This isn't strictly necessary. But the Perfherder code looking at the
+        # values we care about is only active on builds. So it doesn't make
+        # sense to run this linter elsewhere.
+        assert primary_config.startswith("builds/")
+
+        key = (platform, primary_config, shippable, options)
+
+        if key in SEEN_CONFIGS:
+            raise Exception(
+                "Non-unique Perfherder data collection for jobs %s-%s and %s: "
+                "set PERFHERDER_EXTRA_OPTIONS in worker environment variables "
+                "or use different mozconfigs"
+                % (config.kind, job["name"], SEEN_CONFIGS[key])
+            )
+
+        SEEN_CONFIGS[key] = "{}-{}".format(config.kind, job["name"])
+
+        yield job
diff --git a/taskcluster/gecko_taskgraph/transforms/build_signing.py b/taskcluster/gecko_taskgraph/transforms/build_signing.py
new file mode 100644
index 0000000000..36f39f0b56
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/build_signing.py
@@ -0,0 +1,71 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+Transform the signing task into an actual task description.
+"""
+
+
+from taskgraph.transforms.base import TransformSequence
+
+from gecko_taskgraph.util.attributes import copy_attributes_from_dependent_job
+from gecko_taskgraph.util.signed_artifacts import (
+    generate_specifications_of_artifacts_to_sign,
+)
+
+transforms = TransformSequence()
+
+
+@transforms.add
+def add_signed_routes(config, jobs):
+    """Add routes corresponding to the routes of the build task
+    this corresponds to, with .signed inserted, for all gecko.v2 routes"""
+
+    for job in jobs:
+        dep_job = job["primary-dependency"]
+        enable_signing_routes = job.pop("enable-signing-routes", True)
+
+        job["routes"] = []
+        if dep_job.attributes.get("shippable") and enable_signing_routes:
+            for dep_route in dep_job.task.get("routes", []):
+                if not dep_route.startswith("index.gecko.v2"):
+                    continue
+                branch = dep_route.split(".")[3]
+                rest = ".".join(dep_route.split(".")[4:])
+                job["routes"].append(f"index.gecko.v2.{branch}.signed.{rest}")
+
+        yield job
+
+
+@transforms.add
+def define_upstream_artifacts(config, jobs):
+    for job in jobs:
+        dep_job = job["primary-dependency"]
+        upstream_artifact_task = job.pop("upstream-artifact-task", dep_job)
+
+        job["attributes"] = copy_attributes_from_dependent_job(dep_job)
+
+        artifacts_specifications = generate_specifications_of_artifacts_to_sign(
+            config,
+            job,
+            keep_locale_template=False,
+            kind=config.kind,
+            dep_kind=upstream_artifact_task.kind,
+        )
+
+        task_ref = f"<{upstream_artifact_task.kind}>"
+        task_type = "build"
+        if "notarization" in upstream_artifact_task.kind:
+            task_type = "scriptworker"
+
+        job["upstream-artifacts"] = [
+            {
+                "taskId": {"task-reference": task_ref},
+                "taskType": task_type,
+                "paths": spec["artifacts"],
+                "formats": spec["formats"],
+            }
+            for spec in artifacts_specifications
+        ]
+
+        yield job
diff --git a/taskcluster/gecko_taskgraph/transforms/cached_tasks.py b/taskcluster/gecko_taskgraph/transforms/cached_tasks.py
new file mode 100644
index 0000000000..bb7e6e6778
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/cached_tasks.py
@@ -0,0 +1,101 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+
+from collections import deque
+
+import taskgraph
+from taskgraph.transforms.base import TransformSequence
+
+from gecko_taskgraph.util.cached_tasks import add_optimization
+
+transforms = TransformSequence()
+
+
+def order_tasks(config, tasks):
+    """Iterate image tasks in an order where parent tasks come first."""
+    kind_prefix = config.kind + "-"
+
+    pending = deque(tasks)
+    task_labels = {task["label"] for task in pending}
+    emitted = set()
+    while True:
+        try:
+            task = pending.popleft()
+        except IndexError:
+            break
+        parents = {
+            task
+            for task in task.get("dependencies", {}).values()
+            if task.startswith(kind_prefix)
+        }
+        if parents and not emitted.issuperset(parents & task_labels):
+            pending.append(task)
+            continue
+        emitted.add(task["label"])
+        yield task
+
+
+def format_task_digest(cached_task):
+    return "/".join(
+        [
+            cached_task["type"],
+            cached_task["name"],
+            cached_task["digest"],
+        ]
+    )
+
+
+@transforms.add
+def cache_task(config, tasks):
+    if taskgraph.fast:
+        for task in tasks:
+            yield task
+        return
+
+    digests = {}
+    for task in config.kind_dependencies_tasks.values():
+        if (
+            "cached_task" in task.attributes
+            and task.attributes["cached_task"] is not False
+        ):
+            digests[task.label] = format_task_digest(task.attributes["cached_task"])
+
+    for task in order_tasks(config, tasks):
+        cache = task.pop("cache", None)
+        if cache is None:
+            yield task
+            continue
+
+        dependency_digests = []
+        for p in task.get("dependencies", {}).values():
+            if p in digests:
+                dependency_digests.append(digests[p])
+            elif config.params["project"] == "toolchains":
+                # The toolchains repository uses non-cached toolchain artifacts. Allow
+                # tasks to use them.
+                cache = None
+                break
+            else:
+                raise Exception(
+                    "Cached task {} has uncached parent task: {}".format(
+                        task["label"], p
+                    )
+                )
+
+        if cache is None:
+            yield task
+            continue
+
+        digest_data = cache["digest-data"] + sorted(dependency_digests)
+        add_optimization(
+            config,
+            task,
+            cache_type=cache["type"],
+            cache_name=cache["name"],
+            digest_data=digest_data,
+        )
+        digests[task["label"]] = format_task_digest(task["attributes"]["cached_task"])
+
+        yield task
diff --git a/taskcluster/gecko_taskgraph/transforms/chunk_partners.py b/taskcluster/gecko_taskgraph/transforms/chunk_partners.py
new file mode 100644
index 0000000000..ed74cc6232
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/chunk_partners.py
@@ -0,0 +1,75 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+Chunk the partner repack tasks by subpartner and locale
+"""
+
+
+import copy
+
+from mozbuild.chunkify import chunkify
+from taskgraph.transforms.base import TransformSequence
+
+from gecko_taskgraph.util.partners import (
+    apply_partner_priority,
+    get_repack_ids_by_platform,
+)
+
+transforms = TransformSequence()
+transforms.add(apply_partner_priority)
+
+
+@transforms.add
+def chunk_partners(config, jobs):
+    for job in jobs:
+        dep_job = job["primary-dependency"]
+        build_platform = dep_job.attributes["build_platform"]
+        repack_id = dep_job.task.get("extra", {}).get("repack_id")
+        repack_ids = dep_job.task.get("extra", {}).get("repack_ids")
+        copy_repack_ids = job.pop("copy-repack-ids", False)
+
+        if copy_repack_ids:
+            assert repack_ids, "dep_job {} doesn't have repack_ids!".format(
+                dep_job.label
+            )
+            job.setdefault("extra", {})["repack_ids"] = repack_ids
+            yield job
+        # first downstream of the repack task, no chunking or fanout has been done yet
+        elif not any([repack_id, repack_ids]):
+            platform_repack_ids = get_repack_ids_by_platform(config, build_platform)
+            # we chunk mac signing
+            if config.kind in (
+                "release-partner-repack-signing",
+                "release-eme-free-repack-signing",
+                "release-eme-free-repack-mac-signing",
+                "release-partner-repack-mac-signing",
+            ):
+                repacks_per_chunk = job.get("repacks-per-chunk")
+                chunks, remainder = divmod(len(platform_repack_ids), repacks_per_chunk)
+                if remainder:
+                    chunks = int(chunks + 1)
+                for this_chunk in range(1, chunks + 1):
+                    chunk = chunkify(platform_repack_ids, this_chunk, chunks)
+                    partner_job = copy.deepcopy(job)
+                    partner_job.setdefault("extra", {}).setdefault("repack_ids", chunk)
+                    partner_job["extra"]["repack_suffix"] = str(this_chunk)
+                    yield partner_job
+            # linux and windows we fan out immediately to one task per partner-sub_partner-locale
+            else:
+                for repack_id in platform_repack_ids:
+                    partner_job = copy.deepcopy(job)  # don't overwrite dict values here
+                    partner_job.setdefault("extra", {})
+                    partner_job["extra"]["repack_id"] = repack_id
+                    yield partner_job
+        # fan out chunked mac signing for repackage
+        elif repack_ids:
+            for repack_id in repack_ids:
+                partner_job = copy.deepcopy(job)
+                partner_job.setdefault("extra", {}).setdefault("repack_id", repack_id)
+                yield partner_job
+        # otherwise we've fully fanned out already, continue by passing repack_id on
+        else:
+            partner_job = copy.deepcopy(job)
+            partner_job.setdefault("extra", {}).setdefault("repack_id", repack_id)
+            yield partner_job
diff --git a/taskcluster/gecko_taskgraph/transforms/code_review.py b/taskcluster/gecko_taskgraph/transforms/code_review.py
new file mode 100644
index 0000000000..d644e17d0e
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/code_review.py
@@ -0,0 +1,33 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+Add soft dependencies and configuration to code-review tasks.
+"""
+
+
+from taskgraph.transforms.base import TransformSequence
+
+transforms = TransformSequence()
+
+
+@transforms.add
+def add_dependencies(config, jobs):
+    for job in jobs:
+        job.setdefault("soft-dependencies", [])
+        job["soft-dependencies"] += [
+            dep_task.label
+            for dep_task in config.kind_dependencies_tasks.values()
+            if dep_task.attributes.get("code-review") is True
+        ]
+        yield job
+
+
+@transforms.add
+def add_phabricator_config(config, jobs):
+    for job in jobs:
+        diff = config.params.get("phabricator_diff")
+        if diff is not None:
+            code_review = job.setdefault("extra", {}).setdefault("code-review", {})
+            code_review["phabricator-diff"] = diff
+        yield job
diff --git a/taskcluster/gecko_taskgraph/transforms/condprof.py b/taskcluster/gecko_taskgraph/transforms/condprof.py
new file mode 100644
index 0000000000..34cf7e7dd3
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/condprof.py
@@ -0,0 +1,85 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+This transform constructs tasks generate conditioned profiles from
+the condprof/kind.yml file
+"""
+
+from taskgraph.transforms.base import TransformSequence
+from taskgraph.util.schema import Schema
+from voluptuous import Optional
+
+from gecko_taskgraph.transforms.job import job_description_schema
+from gecko_taskgraph.transforms.task import task_description_schema
+from gecko_taskgraph.util.copy_task import copy_task
+
+diff_description_schema = Schema(
+    {
+        # default is settled, but add 'full' to get both
+        Optional("scenarios"): [str],
+        Optional("description"): task_description_schema["description"],
+        Optional("dependencies"): task_description_schema["dependencies"],
+        Optional("fetches"): job_description_schema["fetches"],
+        Optional("index"): task_description_schema["index"],
+        Optional("job-from"): str,
+        Optional("name"): str,
+        Optional("run"): job_description_schema["run"],
+        Optional("run-on-projects"): task_description_schema["run-on-projects"],
+        Optional("scopes"): task_description_schema["scopes"],
+        Optional("treeherder"): task_description_schema["treeherder"],
+        Optional("worker"): job_description_schema["worker"],
+        Optional("worker-type"): task_description_schema["worker-type"],
+    }
+)
+
+transforms = TransformSequence()
+transforms.add_validate(diff_description_schema)
+
+
+@transforms.add
+def generate_scenarios(config, tasks):
+    for task in tasks:
+        cmds = task["run"]["command"]
+        symbol = task["treeherder"]["symbol"].split(")")[0]
+        index = task["index"]
+        jobname = index["job-name"]
+        label = task["name"]
+        run_as_root = task["run"].get("run-as-root", False)
+
+        for scenario in set(task["scenarios"]):
+            extra_args = ""
+            if scenario == "settled":
+                extra_args = " --force-new "
+
+            tcmd = cmds.replace("${EXTRA_ARGS}", extra_args)
+            tcmd = tcmd.replace("${SCENARIO}", scenario)
+
+            index["job-name"] = "%s-%s" % (jobname, scenario)
+
+            taskdesc = {
+                "name": "%s-%s" % (label, scenario),
+                "description": task["description"],
+                "treeherder": {
+                    "symbol": "%s-%s)" % (symbol, scenario),
+                    "platform": task["treeherder"]["platform"],
+                    "kind": task["treeherder"]["kind"],
+                    "tier": task["treeherder"]["tier"],
+                },
+                "worker-type": copy_task(task["worker-type"]),
+                "worker": copy_task(task["worker"]),
+                "index": copy_task(index),
+                "run": {
+                    "using": "run-task",
+                    "cwd": task["run"]["cwd"],
+                    "checkout": task["run"]["checkout"],
+                    "tooltool-downloads": copy_task(task["run"]["tooltool-downloads"]),
+                    "command": tcmd,
+                    "run-as-root": run_as_root,
+                },
+                "run-on-projects": copy_task(task["run-on-projects"]),
+                "scopes": copy_task(task["scopes"]),
+                "dependencies": copy_task(task["dependencies"]),
+                "fetches": copy_task(task["fetches"]),
+            }
+            yield taskdesc
diff --git a/taskcluster/gecko_taskgraph/transforms/copy_attributes_from_dependent_task.py b/taskcluster/gecko_taskgraph/transforms/copy_attributes_from_dependent_task.py
new file mode 100644
index 0000000000..281dd5938f
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/copy_attributes_from_dependent_task.py
@@ -0,0 +1,23 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+Transform the repackage task into an actual task description.
+"""
+
+from taskgraph.transforms.base import TransformSequence
+
+from gecko_taskgraph.util.attributes import copy_attributes_from_dependent_job
+
+transforms = TransformSequence()
+
+
+@transforms.add
+def copy_attributes(config, jobs):
+    for job in jobs:
+        job.setdefault("attributes", {})
+        job["attributes"].update(
+            copy_attributes_from_dependent_job(job["primary-dependency"])
+        )
+
+        yield job
diff --git a/taskcluster/gecko_taskgraph/transforms/cross_channel.py b/taskcluster/gecko_taskgraph/transforms/cross_channel.py
new file mode 100644
index 0000000000..bf6d3a3a4f
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/cross_channel.py
@@ -0,0 +1,44 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+Build a command to run `mach l10n-cross-channel`.
+"""
+
+
+from pipes import quote as shell_quote
+
+from taskgraph.transforms.base import TransformSequence
+from taskgraph.util.schema import resolve_keyed_by
+
+transforms = TransformSequence()
+
+
+@transforms.add
+def resolve_keys(config, jobs):
+    for job in jobs:
+        for item in ["ssh-key-secret", "run.actions"]:
+            resolve_keyed_by(job, item, item, **{"level": str(config.params["level"])})
+        yield job
+
+
+@transforms.add
+def build_command(config, jobs):
+    for job in jobs:
+        command = [
+            "l10n-cross-channel",
+            "-o",
+            "/builds/worker/artifacts/outgoing.diff",
+            "--attempts",
+            "5",
+        ]
+        ssh_key_secret = job.pop("ssh-key-secret")
+        if ssh_key_secret:
+            command.extend(["--ssh-secret", ssh_key_secret])
+            job.setdefault("scopes", []).append(f"secrets:get:{ssh_key_secret}")
+
+        command.extend(job["run"].pop("actions", []))
+        job.setdefault("run", {}).update(
+            {"using": "mach", "mach": " ".join(map(shell_quote, command))}
+        )
+        yield job
diff --git a/taskcluster/gecko_taskgraph/transforms/diffoscope.py b/taskcluster/gecko_taskgraph/transforms/diffoscope.py
new file mode 100644
index 0000000000..b74dc5bb8f
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/diffoscope.py
@@ -0,0 +1,172 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+This transform construct tasks to perform diffs between builds, as
+defined in kind.yml
+"""
+
+from taskgraph.transforms.base import TransformSequence
+from taskgraph.util.schema import Schema
+from taskgraph.util.taskcluster import get_artifact_path
+from voluptuous import Any, Optional, Required
+
+from gecko_taskgraph.transforms.task import task_description_schema
+
+index_or_string = Any(
+    str,
+    {Required("index-search"): str},
+)
+
+diff_description_schema = Schema(
+    {
+        # Name of the diff task.
+        Required("name"): str,
+        # Treeherder tier.
+        Required("tier"): int,
+        # Treeherder symbol.
+        Required("symbol"): str,
+        # relative path (from config.path) to the file the task was defined in.
+        Optional("job-from"): str,
+        # Original and new builds to compare.
+        Required("original"): index_or_string,
+        Required("new"): index_or_string,
+        # Arguments to pass to diffoscope, used for job-defaults in
+        # taskcluster/ci/diffoscope/kind.yml
+        Optional("args"): str,
+        # Extra arguments to pass to diffoscope, that can be set per job.
+        Optional("extra-args"): str,
+        # Fail the task when differences are detected.
+        Optional("fail-on-diff"): bool,
+        # What artifact to check the differences of. Defaults to target.tar.bz2
+        # for Linux, target.dmg for Mac, target.zip for Windows, target.apk for
+        # Android.
+        Optional("artifact"): str,
+        # Whether to unpack first. Diffoscope can normally work without unpacking,
+        # but when one needs to --exclude some contents, that doesn't work out well
+        # if said content is packed (e.g. in omni.ja).
+        Optional("unpack"): bool,
+        # Commands to run before performing the diff.
+        Optional("pre-diff-commands"): [str],
+        # Only run the task on a set of projects/branches.
+        Optional("run-on-projects"): task_description_schema["run-on-projects"],
+        Optional("optimization"): task_description_schema["optimization"],
+    }
+)
+
+transforms = TransformSequence()
+transforms.add_validate(diff_description_schema)
+
+
+@transforms.add
+def fill_template(config, tasks):
+    dummy_tasks = {}
+
+    for task in tasks:
+        name = task["name"]
+
+        deps = {}
+        urls = {}
+        previous_artifact = None
+        artifact = task.get("artifact")
+        for k in ("original", "new"):
+            value = task[k]
+            if isinstance(value, str):
+                deps[k] = value
+                dep_name = k
+                os_hint = value
+            else:
+                index = value["index-search"]
+                if index not in dummy_tasks:
+                    dummy_tasks[index] = {
+                        "label": "index-search-" + index,
+                        "description": index,
+                        "worker-type": "invalid/always-optimized",
+                        "run": {
+                            "using": "always-optimized",
+                        },
+                        "optimization": {
+                            "index-search": [index],
+                        },
+                    }
+                    yield dummy_tasks[index]
+                deps[index] = "index-search-" + index
+                dep_name = index
+                os_hint = index.split(".")[-1]
+            if artifact:
+                pass
+            elif "linux" in os_hint:
+                artifact = "target.tar.bz2"
+            elif "macosx" in os_hint:
+                artifact = "target.dmg"
+            elif "android" in os_hint:
+                artifact = "target.apk"
+            elif "win" in os_hint:
+                artifact = "target.zip"
+            else:
+                raise Exception(f"Cannot figure out the OS for {value!r}")
+            if previous_artifact is not None and previous_artifact != artifact:
+                raise Exception("Cannot compare builds from different OSes")
+            urls[k] = {
+                "artifact-reference": "<{}/{}>".format(
+                    dep_name, get_artifact_path(task, artifact)
+                ),
+            }
+            previous_artifact = artifact
+
+        taskdesc = {
+            "label": "diff-" + name,
+            "description": name,
+            "treeherder": {
+                "symbol": task["symbol"],
+                "platform": "diff/opt",
+                "kind": "other",
+                "tier": task["tier"],
+            },
+            "worker-type": "b-linux-gcp",
+            "worker": {
+                "docker-image": {"in-tree": "diffoscope"},
+                "artifacts": [
+                    {
+                        "type": "file",
+                        "path": f"/builds/worker/{f}",
+                        "name": f"public/{f}",
+                    }
+                    for f in (
+                        "diff.html",
+                        "diff.txt",
+                    )
+                ],
+                "env": {
+                    "ORIG_URL": urls["original"],
+                    "NEW_URL": urls["new"],
+                    "DIFFOSCOPE_ARGS": " ".join(
+                        task[k] for k in ("args", "extra-args") if k in task
+                    ),
+                    "PRE_DIFF": "; ".join(task.get("pre-diff-commands", [])),
+                },
+                "max-run-time": 1800,
+            },
+            "run": {
+                "using": "run-task",
+                "checkout": task.get("unpack", False),
+                "command": "/builds/worker/bin/get_and_diffoscope{}{}".format(
+                    " --unpack" if task.get("unpack") else "",
+                    " --fail" if task.get("fail-on-diff") else "",
+                ),
+            },
+            "dependencies": deps,
+            "optimization": task.get("optimization"),
+        }
+        if "run-on-projects" in task:
+            taskdesc["run-on-projects"] = task["run-on-projects"]
+
+        if artifact.endswith(".dmg"):
+            taskdesc.setdefault("fetches", {}).setdefault("toolchain", []).extend(
+                [
+                    "linux64-cctools-port",
+                    "linux64-libdmg",
+                ]
+            )
+
+        yield taskdesc
diff --git a/taskcluster/gecko_taskgraph/transforms/docker_image.py b/taskcluster/gecko_taskgraph/transforms/docker_image.py
new file mode 100644
index 0000000000..0ccf83bf38
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/docker_image.py
@@ -0,0 +1,209 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+
+import json
+import logging
+import os
+import re
+
+import mozpack.path as mozpath
+import taskgraph
+from taskgraph.transforms.base import TransformSequence
+from taskgraph.util.schema import Schema
+from voluptuous import Optional, Required
+
+from gecko_taskgraph.util.docker import (
+    create_context_tar,
+    generate_context_hash,
+    image_path,
+)
+
+from .. import GECKO
+from .task import task_description_schema
+
+logger = logging.getLogger(__name__)
+
+CONTEXTS_DIR = "docker-contexts"
+
+DIGEST_RE = re.compile("^[0-9a-f]{64}$")
+
+IMAGE_BUILDER_IMAGE = (
+    "mozillareleases/image_builder:5.0.0"
+    "@sha256:"
+    "e510a9a9b80385f71c112d61b2f2053da625aff2b6d430411ac42e424c58953f"
+)
+
+transforms = TransformSequence()
+
+docker_image_schema = Schema(
+    {
+        # Name of the docker image.
+        Required("name"): str,
+        # Name of the parent docker image.
+        Optional("parent"): str,
+        # Treeherder symbol.
+        Required("symbol"): str,
+        # relative path (from config.path) to the file the docker image was defined
+        # in.
+        Optional("job-from"): str,
+        # Arguments to use for the Dockerfile.
+        Optional("args"): {str: str},
+        # Name of the docker image definition under taskcluster/docker, when
+        # different from the docker image name.
+        Optional("definition"): str,
+        # List of package tasks this docker image depends on.
+        Optional("packages"): [str],
+        Optional(
+            "index",
+            description="information for indexing this build so its artifacts can be discovered",
+        ): task_description_schema["index"],
+        Optional(
+            "cache",
+            description="Whether this image should be cached based on inputs.",
+        ): bool,
+    }
+)
+
+
+transforms.add_validate(docker_image_schema)
+
+
+@transforms.add
+def fill_template(config, tasks):
+    if not taskgraph.fast and config.write_artifacts:
+        if not os.path.isdir(CONTEXTS_DIR):
+            os.makedirs(CONTEXTS_DIR)
+
+    for task in tasks:
+        image_name = task.pop("name")
+        job_symbol = task.pop("symbol")
+        args = task.pop("args", {})
+        packages = task.pop("packages", [])
+        parent = task.pop("parent", None)
+
+        for p in packages:
+            if f"packages-{p}" not in config.kind_dependencies_tasks:
+                raise Exception(
+                    "Missing package job for {}-{}: {}".format(
+                        config.kind, image_name, p
+                    )
+                )
+
+        if not taskgraph.fast:
+            context_path = mozpath.relpath(image_path(image_name), GECKO)
+            if config.write_artifacts:
+                context_file = os.path.join(CONTEXTS_DIR, f"{image_name}.tar.gz")
+                logger.info(f"Writing {context_file} for docker image {image_name}")
+                context_hash = create_context_tar(
+                    GECKO, context_path, context_file, image_name, args
+                )
+            else:
+                context_hash = generate_context_hash(
+                    GECKO, context_path, image_name, args
+                )
+        else:
+            if config.write_artifacts:
+                raise Exception("Can't write artifacts if `taskgraph.fast` is set.")
+            context_hash = "0" * 40
+        digest_data = [context_hash]
+        digest_data += [json.dumps(args, sort_keys=True)]
+
+        description = "Build the docker image {} for use by dependent tasks".format(
+            image_name
+        )
+
+        args["DOCKER_IMAGE_PACKAGES"] = " ".join(f"<{p}>" for p in packages)
+
+        # Adjust the zstandard compression level based on the execution level.
+        # We use faster compression for level 1 because we care more about
+        # end-to-end times. We use slower/better compression for other levels
+        # because images are read more often and it is worth the trade-off to
+        # burn more CPU once to reduce image size.
+        zstd_level = "3" if int(config.params["level"]) == 1 else "10"
+
+        # include some information that is useful in reconstructing this task
+        # from JSON
+        taskdesc = {
+            "label": f"{config.kind}-{image_name}",
+            "description": description,
+            "attributes": {
+                "image_name": image_name,
+                "artifact_prefix": "public",
+            },
+            "expiration-policy": "long",
+            "scopes": [],
+            "treeherder": {
+                "symbol": job_symbol,
+                "platform": "taskcluster-images/opt",
+                "kind": "other",
+                "tier": 1,
+            },
+            "run-on-projects": [],
+            "worker-type": "images-gcp",
+            "worker": {
+                "implementation": "docker-worker",
+                "os": "linux",
+                "artifacts": [
+                    {
+                        "type": "file",
+                        "path": "/workspace/image.tar.zst",
+                        "name": "public/image.tar.zst",
+                    }
+                ],
+                "env": {
+                    "CONTEXT_TASK_ID": {"task-reference": "<decision>"},
+                    "CONTEXT_PATH": "public/docker-contexts/{}.tar.gz".format(
+                        image_name
+                    ),
+                    "HASH": context_hash,
+                    "PROJECT": config.params["project"],
+                    "IMAGE_NAME": image_name,
+                    "DOCKER_IMAGE_ZSTD_LEVEL": zstd_level,
+                    "DOCKER_BUILD_ARGS": {"task-reference": json.dumps(args)},
+                    "GECKO_BASE_REPOSITORY": config.params["base_repository"],
+                    "GECKO_HEAD_REPOSITORY": config.params["head_repository"],
+                    "GECKO_HEAD_REV": config.params["head_rev"],
+                },
+                "chain-of-trust": True,
+                "max-run-time": 7200,
+                # FIXME: We aren't currently propagating the exit code
+            },
+        }
+        # Retry for 'funsize-update-generator' if exit status code is -1
+        if image_name in ["funsize-update-generator"]:
+            taskdesc["worker"]["retry-exit-status"] = [-1]
+
+        worker = taskdesc["worker"]
+
+        if image_name == "image_builder":
+            worker["docker-image"] = IMAGE_BUILDER_IMAGE
+            digest_data.append(f"image-builder-image:{IMAGE_BUILDER_IMAGE}")
+        else:
+            worker["docker-image"] = {"in-tree": "image_builder"}
+            deps = taskdesc.setdefault("dependencies", {})
+            deps["docker-image"] = f"{config.kind}-image_builder"
+
+        if packages:
+            deps = taskdesc.setdefault("dependencies", {})
+            for p in sorted(packages):
+                deps[p] = f"packages-{p}"
+
+        if parent:
+            deps = taskdesc.setdefault("dependencies", {})
+            deps["parent"] = f"{config.kind}-{parent}"
+            worker["env"]["PARENT_TASK_ID"] = {
+                "task-reference": "<parent>",
+            }
+        if "index" in task:
+            taskdesc["index"] = task["index"]
+
+        if task.get("cache", True) and not taskgraph.fast:
+            taskdesc["cache"] = {
+                "type": "docker-images.v2",
+                "name": image_name,
+                "digest-data": digest_data,
+            }
+
+        yield taskdesc
diff --git a/taskcluster/gecko_taskgraph/transforms/fetch.py b/taskcluster/gecko_taskgraph/transforms/fetch.py
new file mode 100644
index 0000000000..b51362a905
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/fetch.py
@@ -0,0 +1,387 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+# Support for running tasks that download remote content and re-export
+# it as task artifacts.
+
+
+import os
+import re
+
+import attr
+import taskgraph
+from mozbuild.shellutil import quote as shell_quote
+from mozpack import path as mozpath
+from taskgraph.transforms.base import TransformSequence
+from taskgraph.util.schema import Schema, validate_schema
+from taskgraph.util.treeherder import join_symbol
+from voluptuous import Any, Extra, Optional, Required
+
+import gecko_taskgraph
+
+from ..util.cached_tasks import add_optimization
+
+CACHE_TYPE = "content.v1"
+
+FETCH_SCHEMA = Schema(
+    {
+        # Name of the task.
+        Required("name"): str,
+        # Relative path (from config.path) to the file the task was defined
+        # in.
+        Optional("job-from"): str,
+        # Description of the task.
+        Required("description"): str,
+        Optional(
+            "fetch-alias",
+            description="An alias that can be used instead of the real fetch job name in "
+            "fetch stanzas for jobs.",
+        ): str,
+        Optional(
+            "artifact-prefix",
+            description="The prefix of the taskcluster artifact being uploaded. "
+            "Defaults to `public/`; if it starts with something other than "
+            "`public/` the artifact will require scopes to access.",
+        ): str,
+        Optional("attributes"): {str: object},
+        Required("fetch"): {
+            Required("type"): str,
+            Extra: object,
+        },
+    }
+)
+
+
+# define a collection of payload builders, depending on the worker implementation
+fetch_builders = {}
+
+
+@attr.s(frozen=True)
+class FetchBuilder:
+    schema = attr.ib(type=Schema)
+    builder = attr.ib()
+
+
+def fetch_builder(name, schema):
+    schema = Schema({Required("type"): name}).extend(schema)
+
+    def wrap(func):
+        fetch_builders[name] = FetchBuilder(schema, func)
+        return func
+
+    return wrap
+
+
+transforms = TransformSequence()
+transforms.add_validate(FETCH_SCHEMA)
+
+
+@transforms.add
+def process_fetch_job(config, jobs):
+    # Converts fetch-url entries to the job schema.
+    for job in jobs:
+        typ = job["fetch"]["type"]
+        name = job["name"]
+        fetch = job.pop("fetch")
+
+        if typ not in fetch_builders:
+            raise Exception(f"Unknown fetch type {typ} in fetch {name}")
+        validate_schema(fetch_builders[typ].schema, fetch, f"In task.fetch {name!r}:")
+
+        job.update(configure_fetch(config, typ, name, fetch))
+
+        yield job
+
+
+def configure_fetch(config, typ, name, fetch):
+    if typ not in fetch_builders:
+        raise Exception(f"No fetch type {typ} in fetch {name}")
+    validate_schema(fetch_builders[typ].schema, fetch, f"In task.fetch {name!r}:")
+
+    return fetch_builders[typ].builder(config, name, fetch)
+
+
+@transforms.add
+def make_task(config, jobs):
+    # Fetch tasks are idempotent and immutable. Have them live for
+    # essentially forever.
+    if config.params["level"] == "3":
+        expires = "1000 years"
+    else:
+        expires = "28 days"
+
+    for job in jobs:
+        name = job["name"]
+        artifact_prefix = job.get("artifact-prefix", "public")
+        env = job.get("env", {})
+        env.update({"UPLOAD_DIR": "/builds/worker/artifacts"})
+        attributes = job.get("attributes", {})
+        attributes["fetch-artifact"] = mozpath.join(
+            artifact_prefix, job["artifact_name"]
+        )
+        alias = job.get("fetch-alias")
+        if alias:
+            attributes["fetch-alias"] = alias
+
+        task_expires = "28 days" if attributes.get("cached_task") is False else expires
+        artifact_expires = (
+            "2 days" if attributes.get("cached_task") is False else expires
+        )
+
+        task = {
+            "attributes": attributes,
+            "name": name,
+            "description": job["description"],
+            "expires-after": task_expires,
+            "label": "fetch-%s" % name,
+            "run-on-projects": [],
+            "treeherder": {
+                "symbol": join_symbol("Fetch", name),
+                "kind": "build",
+                "platform": "fetch/opt",
+                "tier": 1,
+            },
+            "run": {
+                "using": "run-task",
+                "checkout": False,
+                "command": job["command"],
+            },
+            "worker-type": "b-linux-gcp",
+            "worker": {
+                "chain-of-trust": True,
+                "docker-image": {"in-tree": "fetch"},
+                "env": env,
+                "max-run-time": 900,
+                "artifacts": [
+                    {
+                        "type": "directory",
+                        "name": artifact_prefix,
+                        "path": "/builds/worker/artifacts",
+                        "expires-after": artifact_expires,
+                    }
+                ],
+            },
+        }
+
+        if job.get("secret", None):
+            task["scopes"] = ["secrets:get:" + job.get("secret")]
+            task["worker"]["taskcluster-proxy"] = True
+
+        if not taskgraph.fast:
+            cache_name = task["label"].replace(f"{config.kind}-", "", 1)
+
+            # This adds the level to the index path automatically.
+            add_optimization(
+                config,
+                task,
+                cache_type=CACHE_TYPE,
+                cache_name=cache_name,
+                digest_data=job["digest_data"],
+            )
+        yield task
+
+
+@fetch_builder(
+    "static-url",
+    schema={
+        # The URL to download.
+        Required("url"): str,
+        # The SHA-256 of the downloaded content.
+        Required("sha256"): str,
+        # Size of the downloaded entity, in bytes.
+        Required("size"): int,
+        # GPG signature verification.
+        Optional("gpg-signature"): {
+            # URL where GPG signature document can be obtained. Can contain the
+            # value ``{url}``, which will be substituted with the value from
+            # ``url``.
+            Required("sig-url"): str,
+            # Path to file containing GPG public key(s) used to validate
+            # download.
+            Required("key-path"): str,
+        },
+        # The name to give to the generated artifact. Defaults to the file
+        # portion of the URL. Using a different extension converts the
+        # archive to the given type. Only conversion to .tar.zst is
+        # supported.
+        Optional("artifact-name"): str,
+        # Strip the given number of path components at the beginning of
+        # each file entry in the archive.
+        # Requires an artifact-name ending with .tar.zst.
+        Optional("strip-components"): int,
+        # Add the given prefix to each file entry in the archive.
+        # Requires an artifact-name ending with .tar.zst.
+        Optional("add-prefix"): str,
+        # IMPORTANT: when adding anything that changes the behavior of the task,
+        # it is important to update the digest data used to compute cache hits.
+    },
+)
+def create_fetch_url_task(config, name, fetch):
+    artifact_name = fetch.get("artifact-name")
+    if not artifact_name:
+        artifact_name = fetch["url"].split("/")[-1]
+
+    command = [
+        "/builds/worker/bin/fetch-content",
+        "static-url",
+    ]
+
+    # Arguments that matter to the cache digest
+    args = [
+        "--sha256",
+        fetch["sha256"],
+        "--size",
+        "%d" % fetch["size"],
+    ]
+
+    if fetch.get("strip-components"):
+        args.extend(["--strip-components", "%d" % fetch["strip-components"]])
+
+    if fetch.get("add-prefix"):
+        args.extend(["--add-prefix", fetch["add-prefix"]])
+
+    command.extend(args)
+
+    env = {}
+
+    if "gpg-signature" in fetch:
+        sig_url = fetch["gpg-signature"]["sig-url"].format(url=fetch["url"])
+        key_path = os.path.join(
+            gecko_taskgraph.GECKO, fetch["gpg-signature"]["key-path"]
+        )
+
+        with open(key_path, "r") as fh:
+            gpg_key = fh.read()
+
+        env["FETCH_GPG_KEY"] = gpg_key
+        command.extend(
+            [
+                "--gpg-sig-url",
+                sig_url,
+                "--gpg-key-env",
+                "FETCH_GPG_KEY",
+            ]
+        )
+
+    command.extend(
+        [
+            fetch["url"],
+            "/builds/worker/artifacts/%s" % artifact_name,
+        ]
+    )
+
+    return {
+        "command": command,
+        "artifact_name": artifact_name,
+        "env": env,
+        # We don't include the GPG signature in the digest because it isn't
+        # materially important for caching: GPG signatures are supplemental
+        # trust checking beyond what the shasum already provides.
+        "digest_data": args + [artifact_name],
+    }
+
+
+@fetch_builder(
+    "git",
+    schema={
+        Required("repo"): str,
+        Required(Any("revision", "branch")): str,
+        Optional("include-dot-git"): bool,
+        Optional("artifact-name"): str,
+        Optional("path-prefix"): str,
+        # ssh-key is a taskcluster secret path (e.g. project/civet/github-deploy-key)
+        # In the secret dictionary, the key should be specified as
+        #  "ssh_privkey": "-----BEGIN OPENSSH PRIVATE KEY-----\nkfksnb3jc..."
+        # n.b. The OpenSSH private key file format requires a newline at the end of the file.
+        Optional("ssh-key"): str,
+    },
+)
+def create_git_fetch_task(config, name, fetch):
+    path_prefix = fetch.get("path-prefix")
+    if not path_prefix:
+        path_prefix = fetch["repo"].rstrip("/").rsplit("/", 1)[-1]
+    artifact_name = fetch.get("artifact-name")
+    if not artifact_name:
+        artifact_name = f"{path_prefix}.tar.zst"
+
+    if "revision" in fetch and "branch" in fetch:
+        raise Exception("revision and branch cannot be used in the same context")
+
+    revision_or_branch = None
+
+    if "revision" in fetch:
+        revision_or_branch = fetch["revision"]
+        if not re.match(r"[0-9a-fA-F]{40}", fetch["revision"]):
+            raise Exception(f'Revision is not a sha1 in fetch task "{name}"')
+    else:
+        # we are sure we are dealing with a branch
+        revision_or_branch = fetch["branch"]
+
+    args = [
+        "/builds/worker/bin/fetch-content",
+        "git-checkout-archive",
+        "--path-prefix",
+        path_prefix,
+        fetch["repo"],
+        revision_or_branch,
+        "/builds/worker/artifacts/%s" % artifact_name,
+    ]
+
+    ssh_key = fetch.get("ssh-key")
+    if ssh_key:
+        args.append("--ssh-key-secret")
+        args.append(ssh_key)
+
+    digest_data = [revision_or_branch, path_prefix, artifact_name]
+    if fetch.get("include-dot-git", False):
+        args.append("--include-dot-git")
+        digest_data.append(".git")
+
+    return {
+        "command": args,
+        "artifact_name": artifact_name,
+        "digest_data": digest_data,
+        "secret": ssh_key,
+    }
+
+
+@fetch_builder(
+    "chromium-fetch",
+    schema={
+        Required("script"): str,
+        # Platform type for chromium build
+        Required("platform"): str,
+        # Chromium revision to obtain
+        Optional("revision"): str,
+        # The name to give to the generated artifact.
+        Required("artifact-name"): str,
+    },
+)
+def create_chromium_fetch_task(config, name, fetch):
+    artifact_name = fetch.get("artifact-name")
+
+    workdir = "/builds/worker"
+
+    platform = fetch.get("platform")
+    revision = fetch.get("revision")
+
+    args = "--platform " + shell_quote(platform)
+    if revision:
+        args += " --revision " + shell_quote(revision)
+
+    cmd = [
+        "bash",
+        "-c",
+        "cd {} && " "/usr/bin/python3 {} {}".format(workdir, fetch["script"], args),
+    ]
+
+    return {
+        "command": cmd,
+        "artifact_name": artifact_name,
+        "digest_data": [
+            f"revision={revision}",
+            f"platform={platform}",
+            f"artifact_name={artifact_name}",
+        ],
+    }
diff --git a/taskcluster/gecko_taskgraph/transforms/final_verify.py b/taskcluster/gecko_taskgraph/transforms/final_verify.py
new file mode 100644
index 0000000000..aa8be35a0d
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/final_verify.py
@@ -0,0 +1,35 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+Transform the beetmover task into an actual task description.
+"""
+
+
+from taskgraph.transforms.base import TransformSequence
+
+transforms = TransformSequence()
+
+
+@transforms.add
+def add_command(config, tasks):
+    for task in tasks:
+        if not task["worker"].get("env"):
+            task["worker"]["env"] = {}
+
+        final_verify_configs = []
+        for upstream in sorted(task.get("dependencies", {}).keys()):
+            if "update-verify-config" in upstream:
+                final_verify_configs.append(
+                    f"<{upstream}/public/build/update-verify.cfg>",
+                )
+        task["run"] = {
+            "using": "run-task",
+            "cwd": "{checkout}",
+            "command": {
+                "artifact-reference": "tools/update-verify/release/final-verification.sh "
+                + " ".join(final_verify_configs),
+            },
+            "sparse-profile": "update-verify",
+        }
+        yield task
diff --git a/taskcluster/gecko_taskgraph/transforms/fxrecord.py b/taskcluster/gecko_taskgraph/transforms/fxrecord.py
new file mode 100644
index 0000000000..0d8a23bfb4
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/fxrecord.py
@@ -0,0 +1,22 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+from taskgraph.transforms.base import TransformSequence
+
+transforms = TransformSequence()
+
+
+@transforms.add
+def fxrecord(config, jobs):
+    for job in jobs:
+        dep_job = job.pop("primary-dependency", None)
+
+        if dep_job is not None:
+            job["dependencies"] = {dep_job.label: dep_job.label}
+            job["treeherder"]["platform"] = dep_job.task["extra"]["treeherder-platform"]
+            job["worker"].setdefault("env", {})["FXRECORD_TASK_ID"] = {
+                "task-reference": f"<{dep_job.label}>"
+            }
+
+            yield job
diff --git a/taskcluster/gecko_taskgraph/transforms/geckodriver_mac_notarization.py b/taskcluster/gecko_taskgraph/transforms/geckodriver_mac_notarization.py
new file mode 100644
index 0000000000..1a996c1fc4
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/geckodriver_mac_notarization.py
@@ -0,0 +1,68 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+Transform the repackage signing task into an actual task description.
+"""
+
+from taskgraph.transforms.base import TransformSequence
+from voluptuous import Optional
+
+from gecko_taskgraph.loader.single_dep import schema
+from gecko_taskgraph.transforms.task import task_description_schema
+from gecko_taskgraph.util.attributes import copy_attributes_from_dependent_job
+from gecko_taskgraph.util.scriptworker import add_scope_prefix
+
+repackage_signing_description_schema = schema.extend(
+    {
+        Optional("label"): str,
+        Optional("treeherder"): task_description_schema["treeherder"],
+        Optional("shipping-phase"): task_description_schema["shipping-phase"],
+        Optional("worker"): task_description_schema["worker"],
+        Optional("worker-type"): task_description_schema["worker-type"],
+    }
+)
+
+transforms = TransformSequence()
+transforms.add_validate(repackage_signing_description_schema)
+
+
+@transforms.add
+def geckodriver_mac_notarization(config, jobs):
+    for job in jobs:
+        dep_job = job["primary-dependency"]
+
+        attributes = copy_attributes_from_dependent_job(dep_job)
+        treeherder = job.get("treeherder", {})
+        dep_treeherder = dep_job.task.get("extra", {}).get("treeherder", {})
+        treeherder.setdefault(
+            "platform", dep_job.task.get("extra", {}).get("treeherder-platform")
+        )
+        treeherder.setdefault("tier", dep_treeherder.get("tier", 1))
+        treeherder.setdefault("kind", "build")
+
+        dependencies = {dep_job.kind: dep_job.label}
+
+        description = "Mac notarization - Geckodriver for build '{}'".format(
+            attributes.get("build_platform"),
+        )
+
+        build_platform = dep_job.attributes.get("build_platform")
+
+        scopes = [add_scope_prefix(config, "signing:cert:release-apple-notarization")]
+
+        platform = build_platform.rsplit("-", 1)[0]
+
+        task = {
+            "label": job["label"],
+            "description": description,
+            "worker-type": job["worker-type"],
+            "worker": job["worker"],
+            "scopes": scopes,
+            "dependencies": dependencies,
+            "attributes": attributes,
+            "treeherder": treeherder,
+            "run-on-projects": ["mozilla-central"],
+            "index": {"product": "geckodriver", "job-name": f"{platform}-notarized"},
+        }
+        yield task
diff --git a/taskcluster/gecko_taskgraph/transforms/geckodriver_signing.py b/taskcluster/gecko_taskgraph/transforms/geckodriver_signing.py
new file mode 100644
index 0000000000..05bc1319de
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/geckodriver_signing.py
@@ -0,0 +1,124 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+Transform the repackage signing task into an actual task description.
+"""
+
+from taskgraph.transforms.base import TransformSequence
+from voluptuous import Optional
+
+from gecko_taskgraph.loader.single_dep import schema
+from gecko_taskgraph.transforms.task import task_description_schema
+from gecko_taskgraph.util.attributes import copy_attributes_from_dependent_job
+from gecko_taskgraph.util.scriptworker import get_signing_cert_scope_per_platform
+
+repackage_signing_description_schema = schema.extend(
+    {
+        Optional("label"): str,
+        Optional("treeherder"): task_description_schema["treeherder"],
+        Optional("shipping-phase"): task_description_schema["shipping-phase"],
+    }
+)
+
+transforms = TransformSequence()
+transforms.add_validate(repackage_signing_description_schema)
+
+
+@transforms.add
+def make_signing_description(config, jobs):
+    for job in jobs:
+        dep_job = job["primary-dependency"]
+
+        attributes = copy_attributes_from_dependent_job(dep_job)
+        attributes["repackage_type"] = "repackage-signing"
+
+        treeherder = job.get("treeherder", {})
+        dep_treeherder = dep_job.task.get("extra", {}).get("treeherder", {})
+        treeherder.setdefault(
+            "symbol", "{}(gd-s)".format(dep_treeherder["groupSymbol"])
+        )
+        treeherder.setdefault(
+            "platform", dep_job.task.get("extra", {}).get("treeherder-platform")
+        )
+        treeherder.setdefault("tier", dep_treeherder.get("tier", 1))
+        treeherder.setdefault("kind", "build")
+
+        dependencies = {dep_job.kind: dep_job.label}
+        signing_dependencies = dep_job.dependencies
+        dependencies.update(
+            {k: v for k, v in signing_dependencies.items() if k != "docker-image"}
+        )
+
+        description = "Signing Geckodriver for build '{}'".format(
+            attributes.get("build_platform"),
+        )
+
+        build_platform = dep_job.attributes.get("build_platform")
+        is_shippable = dep_job.attributes.get("shippable")
+        signing_cert_scope = get_signing_cert_scope_per_platform(
+            build_platform, is_shippable, config
+        )
+
+        upstream_artifacts = _craft_upstream_artifacts(
+            dep_job, dep_job.kind, build_platform
+        )
+
+        scopes = [signing_cert_scope]
+
+        platform = build_platform.rsplit("-", 1)[0]
+
+        task = {
+            "label": job["label"],
+            "description": description,
+            "worker-type": "linux-signing",
+            "worker": {
+                "implementation": "scriptworker-signing",
+                "upstream-artifacts": upstream_artifacts,
+            },
+            "scopes": scopes,
+            "dependencies": dependencies,
+            "attributes": attributes,
+            "treeherder": treeherder,
+            "run-on-projects": ["mozilla-central"],
+            "index": {"product": "geckodriver", "job-name": platform},
+        }
+
+        if build_platform.startswith("macosx"):
+            worker_type = task["worker-type"]
+            worker_type_alias_map = {
+                "linux-depsigning": "mac-depsigning",
+                "linux-signing": "mac-signing",
+            }
+
+            assert worker_type in worker_type_alias_map, (
+                "Make sure to adjust the below worker_type_alias logic for "
+                "mac if you change the signing workerType aliases!"
+                " ({} not found in mapping)".format(worker_type)
+            )
+            worker_type = worker_type_alias_map[worker_type]
+
+            task["worker-type"] = worker_type_alias_map[task["worker-type"]]
+            task["worker"]["mac-behavior"] = "mac_geckodriver"
+
+        yield task
+
+
+def _craft_upstream_artifacts(dep_job, dependency_kind, build_platform):
+    if build_platform.startswith("win"):
+        signing_format = "autograph_authenticode_sha2"
+    elif build_platform.startswith("linux"):
+        signing_format = "autograph_gpg"
+    elif build_platform.startswith("macosx"):
+        signing_format = "mac_geckodriver"
+    else:
+        raise ValueError(f'Unsupported build platform "{build_platform}"')
+
+    return [
+        {
+            "taskId": {"task-reference": f"<{dependency_kind}>"},
+            "taskType": "build",
+            "paths": [dep_job.attributes["toolchain-artifact"]],
+            "formats": [signing_format],
+        }
+    ]
diff --git a/taskcluster/gecko_taskgraph/transforms/github_sync.py b/taskcluster/gecko_taskgraph/transforms/github_sync.py
new file mode 100644
index 0000000000..6f48f794ce
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/github_sync.py
@@ -0,0 +1,23 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+from taskgraph.transforms.base import TransformSequence
+
+transforms = TransformSequence()
+
+
+@transforms.add
+def sync_github(config, tasks):
+    """Do transforms specific to github-sync tasks."""
+    for task in tasks:
+        # Add the secret to the scopes, only in m-c.
+        # Doing this on any other tree will result in decision task failure
+        # because m-c is the only one allowed to have that scope.
+        secret = task["secret"]
+        if config.params["project"] == "mozilla-central":
+            task.setdefault("scopes", [])
+            task["scopes"].append("secrets:get:" + secret)
+            task["worker"].setdefault("env", {})["GITHUB_SECRET"] = secret
+        del task["secret"]
+        yield task
diff --git a/taskcluster/gecko_taskgraph/transforms/job/__init__.py b/taskcluster/gecko_taskgraph/transforms/job/__init__.py
new file mode 100644
index 0000000000..9b6924b605
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/job/__init__.py
@@ -0,0 +1,504 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+Convert a job description into a task description.
+
+Jobs descriptions are similar to task descriptions, but they specify how to run
+the job at a higher level, using a "run" field that can be interpreted by
+run-using handlers in `taskcluster/gecko_taskgraph/transforms/job`.
+"""
+
+
+import json
+import logging
+
+import mozpack.path as mozpath
+from taskgraph.transforms.base import TransformSequence
+from taskgraph.util.python_path import import_sibling_modules
+from taskgraph.util.schema import Schema, validate_schema
+from taskgraph.util.taskcluster import get_artifact_prefix
+from voluptuous import Any, Exclusive, Extra, Optional, Required
+
+from gecko_taskgraph.transforms.cached_tasks import order_tasks
+from gecko_taskgraph.transforms.task import task_description_schema
+from gecko_taskgraph.util.copy_task import copy_task
+from gecko_taskgraph.util.workertypes import worker_type_implementation
+
+logger = logging.getLogger(__name__)
+
+# Schema for a build description
+job_description_schema = Schema(
+    {
+        # The name of the job and the job's label.  At least one must be specified,
+        # and the label will be generated from the name if necessary, by prepending
+        # the kind.
+        Optional("name"): str,
+        Optional("label"): str,
+        # the following fields are passed directly through to the task description,
+        # possibly modified by the run implementation.  See
+        # taskcluster/gecko_taskgraph/transforms/task.py for the schema details.
+        Required("description"): task_description_schema["description"],
+        Optional("attributes"): task_description_schema["attributes"],
+        Optional("job-from"): task_description_schema["job-from"],
+        Optional("dependencies"): task_description_schema["dependencies"],
+        Optional("if-dependencies"): task_description_schema["if-dependencies"],
+        Optional("soft-dependencies"): task_description_schema["soft-dependencies"],
+        Optional("if-dependencies"): task_description_schema["if-dependencies"],
+        Optional("requires"): task_description_schema["requires"],
+        Optional("expires-after"): task_description_schema["expires-after"],
+        Optional("expiration-policy"): task_description_schema["expiration-policy"],
+        Optional("routes"): task_description_schema["routes"],
+        Optional("scopes"): task_description_schema["scopes"],
+        Optional("tags"): task_description_schema["tags"],
+        Optional("extra"): task_description_schema["extra"],
+        Optional("treeherder"): task_description_schema["treeherder"],
+        Optional("index"): task_description_schema["index"],
+        Optional("run-on-projects"): task_description_schema["run-on-projects"],
+        Optional("shipping-phase"): task_description_schema["shipping-phase"],
+        Optional("shipping-product"): task_description_schema["shipping-product"],
+        Optional("always-target"): task_description_schema["always-target"],
+        Exclusive("optimization", "optimization"): task_description_schema[
+            "optimization"
+        ],
+        Optional("use-sccache"): task_description_schema["use-sccache"],
+        Optional("use-system-python"): bool,
+        Optional("priority"): task_description_schema["priority"],
+        # The "when" section contains descriptions of the circumstances under which
+        # this task should be included in the task graph.  This will be converted
+        # into an optimization, so it cannot be specified in a job description that
+        # also gives 'optimization'.
+        Exclusive("when", "optimization"): Any(
+            None,
+            {
+                # This task only needs to be run if a file matching one of the given
+                # patterns has changed in the push.  The patterns use the mozpack
+                # match function (python/mozbuild/mozpack/path.py).
+                Optional("files-changed"): [str],
+            },
+        ),
+        # A list of artifacts to install from 'fetch' tasks.
+        Optional("fetches"): {
+            str: [
+                str,
+                {
+                    Required("artifact"): str,
+                    Optional("dest"): str,
+                    Optional("extract"): bool,
+                    Optional("verify-hash"): bool,
+                },
+            ],
+        },
+        # A description of how to run this job.
+        "run": {
+            # The key to a job implementation in a peer module to this one
+            "using": str,
+            # Base work directory used to set up the task.
+            Optional("workdir"): str,
+            # Any remaining content is verified against that job implementation's
+            # own schema.
+            Extra: object,
+        },
+        Required("worker-type"): task_description_schema["worker-type"],
+        # This object will be passed through to the task description, with additions
+        # provided by the job's run-using function
+        Optional("worker"): dict,
+    }
+)
+
+transforms = TransformSequence()
+transforms.add_validate(job_description_schema)
+
+
+@transforms.add
+def rewrite_when_to_optimization(config, jobs):
+    for job in jobs:
+        when = job.pop("when", {})
+        if not when:
+            yield job
+            continue
+
+        files_changed = when.get("files-changed")
+
+        # implicitly add task config directory.
+        files_changed.append(f"{config.path}/**")
+
+        # "only when files changed" implies "skip if files have not changed"
+        job["optimization"] = {"skip-unless-changed": files_changed}
+
+        assert "when" not in job
+        yield job
+
+
+@transforms.add
+def set_implementation(config, jobs):
+    for job in jobs:
+        impl, os = worker_type_implementation(
+            config.graph_config, config.params, job["worker-type"]
+        )
+        if os:
+            job.setdefault("tags", {})["os"] = os
+        if impl:
+            job.setdefault("tags", {})["worker-implementation"] = impl
+        worker = job.setdefault("worker", {})
+        assert "implementation" not in worker
+        worker["implementation"] = impl
+        if os:
+            worker["os"] = os
+        yield job
+
+
+@transforms.add
+def set_label(config, jobs):
+    for job in jobs:
+        if "label" not in job:
+            if "name" not in job:
+                raise Exception("job has neither a name nor a label")
+            job["label"] = "{}-{}".format(config.kind, job["name"])
+        if job.get("name"):
+            del job["name"]
+        yield job
+
+
+@transforms.add
+def add_resource_monitor(config, jobs):
+    for job in jobs:
+        if job.get("attributes", {}).get("resource-monitor"):
+            worker_implementation, worker_os = worker_type_implementation(
+                config.graph_config, config.params, job["worker-type"]
+            )
+            # Normalise worker os so that linux-bitbar and similar use linux tools.
+            worker_os = worker_os.split("-")[0]
+            # We don't currently support an Arm worker, due to gopsutil's indirect
+            # dependencies (go-ole)
+            if "aarch64" in job["worker-type"]:
+                yield job
+                continue
+            elif "win7" in job["worker-type"]:
+                arch = "32"
+            else:
+                arch = "64"
+            job.setdefault("fetches", {})
+            job["fetches"].setdefault("toolchain", [])
+            job["fetches"]["toolchain"].append(f"{worker_os}{arch}-resource-monitor")
+
+            if worker_implementation == "docker-worker":
+                artifact_source = "/builds/worker/monitoring/resource-monitor.json"
+            else:
+                artifact_source = "monitoring/resource-monitor.json"
+            job["worker"].setdefault("artifacts", [])
+            job["worker"]["artifacts"].append(
+                {
+                    "name": "public/monitoring/resource-monitor.json",
+                    "type": "file",
+                    "path": artifact_source,
+                }
+            )
+            # Set env for output file
+            job["worker"].setdefault("env", {})
+            job["worker"]["env"]["RESOURCE_MONITOR_OUTPUT"] = artifact_source
+
+        yield job
+
+
+@transforms.add
+def make_task_description(config, jobs):
+    """Given a build description, create a task description"""
+    # import plugin modules first, before iterating over jobs
+    import_sibling_modules(exceptions=("common.py",))
+
+    for job in jobs:
+        # only docker-worker uses a fixed absolute path to find directories
+        if job["worker"]["implementation"] == "docker-worker":
+            job["run"].setdefault("workdir", "/builds/worker")
+
+        taskdesc = copy_task(job)
+
+        # fill in some empty defaults to make run implementations easier
+        taskdesc.setdefault("attributes", {})
+        taskdesc.setdefault("dependencies", {})
+        taskdesc.setdefault("if-dependencies", [])
+        taskdesc.setdefault("soft-dependencies", [])
+        taskdesc.setdefault("routes", [])
+        taskdesc.setdefault("scopes", [])
+        taskdesc.setdefault("extra", {})
+
+        # give the function for job.run.using on this worker implementation a
+        # chance to set up the task description.
+        configure_taskdesc_for_run(
+            config, job, taskdesc, job["worker"]["implementation"]
+        )
+        del taskdesc["run"]
+
+        # yield only the task description, discarding the job description
+        yield taskdesc
+
+
+def get_attribute(dict, key, attributes, attribute_name):
+    """Get `attribute_name` from the given `attributes` dict, and if there
+    is a corresponding value, set `key` in `dict` to that value."""
+    value = attributes.get(attribute_name)
+    if value:
+        dict[key] = value
+
+
+@transforms.add
+def use_system_python(config, jobs):
+    for job in jobs:
+        if job.pop("use-system-python", True):
+            yield job
+        else:
+            fetches = job.setdefault("fetches", {})
+            toolchain = fetches.setdefault("toolchain", [])
+
+            moz_python_home = mozpath.join("fetches", "python")
+            if "win" in job["worker"]["os"]:
+                platform = "win64"
+            elif "linux" in job["worker"]["os"]:
+                platform = "linux64"
+            elif "macosx" in job["worker"]["os"]:
+                platform = "macosx64"
+            else:
+                raise ValueError("unexpected worker.os value {}".format(platform))
+
+            toolchain.append("{}-python".format(platform))
+
+            worker = job.setdefault("worker", {})
+            env = worker.setdefault("env", {})
+            env["MOZ_PYTHON_HOME"] = moz_python_home
+
+            yield job
+
+
+@transforms.add
+def use_fetches(config, jobs):
+    artifact_names = {}
+    extra_env = {}
+    aliases = {}
+    tasks = []
+
+    if config.kind in ("toolchain", "fetch"):
+        jobs = list(jobs)
+        tasks.extend((config.kind, j) for j in jobs)
+
+    tasks.extend(
+        (task.kind, task.__dict__)
+        for task in config.kind_dependencies_tasks.values()
+        if task.kind in ("fetch", "toolchain")
+    )
+    for (kind, task) in tasks:
+        get_attribute(
+            artifact_names, task["label"], task["attributes"], f"{kind}-artifact"
+        )
+        get_attribute(extra_env, task["label"], task["attributes"], f"{kind}-env")
+        value = task["attributes"].get(f"{kind}-alias")
+        if not value:
+            value = []
+        elif isinstance(value, str):
+            value = [value]
+        for alias in value:
+            fully_qualified = f"{kind}-{alias}"
+            label = task["label"]
+            if fully_qualified == label:
+                raise Exception(f"The alias {alias} of task {label} points to itself!")
+            aliases[fully_qualified] = label
+
+    artifact_prefixes = {}
+    for job in order_tasks(config, jobs):
+        artifact_prefixes[job["label"]] = get_artifact_prefix(job)
+
+        fetches = job.pop("fetches", None)
+        if not fetches:
+            yield job
+            continue
+
+        job_fetches = []
+        name = job.get("name") or job.get("label").replace(f"{config.kind}-", "")
+        dependencies = job.setdefault("dependencies", {})
+        worker = job.setdefault("worker", {})
+        env = worker.setdefault("env", {})
+        prefix = get_artifact_prefix(job)
+        has_sccache = False
+        for kind, artifacts in fetches.items():
+            if kind in ("fetch", "toolchain"):
+                for fetch_name in artifacts:
+                    label = f"{kind}-{fetch_name}"
+                    label = aliases.get(label, label)
+                    if label not in artifact_names:
+                        raise Exception(
+                            "Missing fetch job for {kind}-{name}: {fetch}".format(
+                                kind=config.kind, name=name, fetch=fetch_name
+                            )
+                        )
+                    if label in extra_env:
+                        env.update(extra_env[label])
+
+                    path = artifact_names[label]
+
+                    dependencies[label] = label
+                    job_fetches.append(
+                        {
+                            "artifact": path,
+                            "task": f"<{label}>",
+                            "extract": True,
+                        }
+                    )
+
+                    if kind == "toolchain" and fetch_name.endswith("-sccache"):
+                        has_sccache = True
+            else:
+                if kind not in dependencies:
+                    raise Exception(
+                        "{name} can't fetch {kind} artifacts because "
+                        "it has no {kind} dependencies!".format(name=name, kind=kind)
+                    )
+                dep_label = dependencies[kind]
+                if dep_label in artifact_prefixes:
+                    prefix = artifact_prefixes[dep_label]
+                else:
+                    if dep_label not in config.kind_dependencies_tasks:
+                        raise Exception(
+                            "{name} can't fetch {kind} artifacts because "
+                            "there are no tasks with label {label} in kind dependencies!".format(
+                                name=name,
+                                kind=kind,
+                                label=dependencies[kind],
+                            )
+                        )
+
+                    prefix = get_artifact_prefix(
+                        config.kind_dependencies_tasks[dep_label]
+                    )
+
+                for artifact in artifacts:
+                    if isinstance(artifact, str):
+                        path = artifact
+                        dest = None
+                        extract = True
+                        verify_hash = False
+                    else:
+                        path = artifact["artifact"]
+                        dest = artifact.get("dest")
+                        extract = artifact.get("extract", True)
+                        verify_hash = artifact.get("verify-hash", False)
+
+                    fetch = {
+                        "artifact": f"{prefix}/{path}"
+                        if not path.startswith("/")
+                        else path[1:],
+                        "task": f"<{kind}>",
+                        "extract": extract,
+                    }
+                    if dest is not None:
+                        fetch["dest"] = dest
+                    if verify_hash:
+                        fetch["verify-hash"] = verify_hash
+                    job_fetches.append(fetch)
+
+        if job.get("use-sccache") and not has_sccache:
+            raise Exception("Must provide an sccache toolchain if using sccache.")
+
+        job_artifact_prefixes = {
+            mozpath.dirname(fetch["artifact"])
+            for fetch in job_fetches
+            if not fetch["artifact"].startswith("public/")
+        }
+        if job_artifact_prefixes:
+            # Use taskcluster-proxy and request appropriate scope.  For example, add
+            # 'scopes: [queue:get-artifact:path/to/*]' for 'path/to/artifact.tar.xz'.
+            worker["taskcluster-proxy"] = True
+            for prefix in sorted(job_artifact_prefixes):
+                scope = f"queue:get-artifact:{prefix}/*"
+                if scope not in job.setdefault("scopes", []):
+                    job["scopes"].append(scope)
+
+        artifacts = {}
+        for f in job_fetches:
+            _, __, artifact = f["artifact"].rpartition("/")
+            if "dest" in f:
+                artifact = f"{f['dest']}/{artifact}"
+            task = f["task"][1:-1]
+            if artifact in artifacts:
+                raise Exception(
+                    f"Task {name} depends on {artifacts[artifact]} and {task} "
+                    f"that both provide {artifact}"
+                )
+            artifacts[artifact] = task
+
+        env["MOZ_FETCHES"] = {
+            "task-reference": json.dumps(
+                sorted(job_fetches, key=lambda x: sorted(x.items())), sort_keys=True
+            )
+        }
+        # The path is normalized to an absolute path in run-task
+        env.setdefault("MOZ_FETCHES_DIR", "fetches")
+
+        yield job
+
+
+# A registry of all functions decorated with run_job_using
+registry = {}
+
+
+def run_job_using(worker_implementation, run_using, schema=None, defaults={}):
+    """Register the decorated function as able to set up a task description for
+    jobs with the given worker implementation and `run.using` property.  If
+    `schema` is given, the job's run field will be verified to match it.
+
+    The decorated function should have the signature `using_foo(config, job, taskdesc)`
+    and should modify the task description in-place.  The skeleton of
+    the task description is already set up, but without a payload."""
+
+    def wrap(func):
+        for_run_using = registry.setdefault(run_using, {})
+        if worker_implementation in for_run_using:
+            raise Exception(
+                "run_job_using({!r}, {!r}) already exists: {!r}".format(
+                    run_using, worker_implementation, for_run_using[run_using]
+                )
+            )
+        for_run_using[worker_implementation] = (func, schema, defaults)
+        return func
+
+    return wrap
+
+
+@run_job_using(
+    "always-optimized", "always-optimized", Schema({"using": "always-optimized"})
+)
+def always_optimized(config, job, taskdesc):
+    pass
+
+
+def configure_taskdesc_for_run(config, job, taskdesc, worker_implementation):
+    """
+    Run the appropriate function for this job against the given task
+    description.
+
+    This will raise an appropriate error if no function exists, or if the job's
+    run is not valid according to the schema.
+    """
+    run_using = job["run"]["using"]
+    if run_using not in registry:
+        raise Exception(f"no functions for run.using {run_using!r}")
+
+    if worker_implementation not in registry[run_using]:
+        raise Exception(
+            "no functions for run.using {!r} on {!r}".format(
+                run_using, worker_implementation
+            )
+        )
+
+    func, schema, defaults = registry[run_using][worker_implementation]
+    for k, v in defaults.items():
+        job["run"].setdefault(k, v)
+
+    if schema:
+        validate_schema(
+            schema,
+            job["run"],
+            "In job.run using {!r}/{!r} for job {!r}:".format(
+                job["run"]["using"], worker_implementation, job["label"]
+            ),
+        )
+    func(config, job, taskdesc)
diff --git a/taskcluster/gecko_taskgraph/transforms/job/common.py b/taskcluster/gecko_taskgraph/transforms/job/common.py
new file mode 100644
index 0000000000..0c6289a6db
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/job/common.py
@@ -0,0 +1,269 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+Common support for various job types.  These functions are all named after the
+worker implementation they operate on, and take the same three parameters, for
+consistency.
+"""
+
+
+from taskgraph.util.keyed_by import evaluate_keyed_by
+from taskgraph.util.taskcluster import get_artifact_prefix
+
+SECRET_SCOPE = "secrets:get:project/releng/{trust_domain}/{kind}/level-{level}/{secret}"
+
+
+def add_cache(job, taskdesc, name, mount_point, skip_untrusted=False):
+    """Adds a cache based on the worker's implementation.
+
+    Args:
+        job (dict): Task's job description.
+        taskdesc (dict): Target task description to modify.
+        name (str): Name of the cache.
+        mount_point (path): Path on the host to mount the cache.
+        skip_untrusted (bool): Whether cache is used in untrusted environments
+            (default: False). Only applies to docker-worker.
+    """
+    if not job["run"].get("use-caches", True):
+        return
+
+    worker = job["worker"]
+
+    if worker["implementation"] == "docker-worker":
+        taskdesc["worker"].setdefault("caches", []).append(
+            {
+                "type": "persistent",
+                "name": name,
+                "mount-point": mount_point,
+                "skip-untrusted": skip_untrusted,
+            }
+        )
+
+    elif worker["implementation"] == "generic-worker":
+        taskdesc["worker"].setdefault("mounts", []).append(
+            {
+                "cache-name": name,
+                "directory": mount_point,
+            }
+        )
+
+    else:
+        # Caches not implemented
+        pass
+
+
+def add_artifacts(config, job, taskdesc, path):
+    taskdesc["worker"].setdefault("artifacts", []).append(
+        {
+            "name": get_artifact_prefix(taskdesc),
+            "path": path,
+            "type": "directory",
+        }
+    )
+
+
+def docker_worker_add_artifacts(config, job, taskdesc):
+    """Adds an artifact directory to the task"""
+    path = "{workdir}/artifacts/".format(**job["run"])
+    taskdesc["worker"].setdefault("env", {})["UPLOAD_DIR"] = path
+    add_artifacts(config, job, taskdesc, path)
+
+
+def generic_worker_add_artifacts(config, job, taskdesc):
+    """Adds an artifact directory to the task"""
+    # The path is the location on disk; it doesn't necessarily
+    # mean the artifacts will be public or private; that is set via the name
+    # attribute in add_artifacts.
+    path = get_artifact_prefix(taskdesc)
+    taskdesc["worker"].setdefault("env", {})["UPLOAD_DIR"] = path
+    add_artifacts(config, job, taskdesc, path=path)
+
+
+def support_vcs_checkout(config, job, taskdesc, sparse=False):
+    """Update a job/task with parameters to enable a VCS checkout.
+
+    This can only be used with ``run-task`` tasks, as the cache name is
+    reserved for ``run-task`` tasks.
+    """
+    worker = job["worker"]
+    is_mac = worker["os"] == "macosx"
+    is_win = worker["os"] == "windows"
+    is_linux = worker["os"] == "linux" or "linux-bitbar"
+    is_docker = worker["implementation"] == "docker-worker"
+    assert is_mac or is_win or is_linux
+
+    if is_win:
+        checkoutdir = "./build"
+        geckodir = f"{checkoutdir}/src"
+        hgstore = "y:/hg-shared"
+    elif is_docker:
+        checkoutdir = "{workdir}/checkouts".format(**job["run"])
+        geckodir = f"{checkoutdir}/gecko"
+        hgstore = f"{checkoutdir}/hg-store"
+    else:
+        checkoutdir = "./checkouts"
+        geckodir = f"{checkoutdir}/gecko"
+        hgstore = f"{checkoutdir}/hg-shared"
+
+    cache_name = "checkouts"
+
+    # Sparse checkouts need their own cache because they can interfere
+    # with clients that aren't sparse aware.
+    if sparse:
+        cache_name += "-sparse"
+
+    # Workers using Mercurial >= 5.8 will enable revlog-compression-zstd, which
+    # workers using older versions can't understand, so they can't share cache.
+    # At the moment, only docker workers use the newer version.
+    if is_docker:
+        cache_name += "-hg58"
+
+    add_cache(job, taskdesc, cache_name, checkoutdir)
+
+    taskdesc["worker"].setdefault("env", {}).update(
+        {
+            "GECKO_BASE_REPOSITORY": config.params["base_repository"],
+            "GECKO_HEAD_REPOSITORY": config.params["head_repository"],
+            "GECKO_HEAD_REV": config.params["head_rev"],
+            "HG_STORE_PATH": hgstore,
+        }
+    )
+    taskdesc["worker"]["env"].setdefault("GECKO_PATH", geckodir)
+
+    if "comm_base_repository" in config.params:
+        taskdesc["worker"]["env"].update(
+            {
+                "COMM_BASE_REPOSITORY": config.params["comm_base_repository"],
+                "COMM_HEAD_REPOSITORY": config.params["comm_head_repository"],
+                "COMM_HEAD_REV": config.params["comm_head_rev"],
+            }
+        )
+    elif job["run"].get("comm-checkout", False):
+        raise Exception(
+            "Can't checkout from comm-* repository if not given a repository."
+        )
+
+    # Give task access to hgfingerprint secret so it can pin the certificate
+    # for hg.mozilla.org.
+    taskdesc["scopes"].append("secrets:get:project/taskcluster/gecko/hgfingerprint")
+    taskdesc["scopes"].append("secrets:get:project/taskcluster/gecko/hgmointernal")
+
+    # only some worker platforms have taskcluster-proxy enabled
+    if job["worker"]["implementation"] in ("docker-worker",):
+        taskdesc["worker"]["taskcluster-proxy"] = True
+
+
+def generic_worker_hg_commands(
+    base_repo, head_repo, head_rev, path, sparse_profile=None
+):
+    """Obtain commands needed to obtain a Mercurial checkout on generic-worker.
+
+    Returns two command strings. One performs the checkout. Another logs.
+    """
+    args = [
+        r'"c:\Program Files\Mercurial\hg.exe"',
+        "robustcheckout",
+        "--sharebase",
+        r"y:\hg-shared",
+        "--purge",
+        "--upstream",
+        base_repo,
+        "--revision",
+        head_rev,
+    ]
+
+    if sparse_profile:
+        args.extend(["--config", "extensions.sparse="])
+        args.extend(["--sparseprofile", sparse_profile])
+
+    args.extend(
+        [
+            head_repo,
+            path,
+        ]
+    )
+
+    logging_args = [
+        b":: TinderboxPrint:<a href={source_repo}/rev/{revision} "
+        b"title='Built from {repo_name} revision {revision}'>{revision}</a>"
+        b"\n".format(
+            revision=head_rev, source_repo=head_repo, repo_name=head_repo.split("/")[-1]
+        ),
+    ]
+
+    return [" ".join(args), " ".join(logging_args)]
+
+
+def setup_secrets(config, job, taskdesc):
+    """Set up access to secrets via taskcluster-proxy.  The value of
+    run['secrets'] should be a boolean or a list of secret names that
+    can be accessed."""
+    if not job["run"].get("secrets"):
+        return
+
+    taskdesc["worker"]["taskcluster-proxy"] = True
+    secrets = job["run"]["secrets"]
+    if secrets is True:
+        secrets = ["*"]
+    for secret in secrets:
+        taskdesc["scopes"].append(
+            SECRET_SCOPE.format(
+                trust_domain=config.graph_config["trust-domain"],
+                kind=job["treeherder"]["kind"],
+                level=config.params["level"],
+                secret=secret,
+            )
+        )
+
+
+def add_tooltool(config, job, taskdesc, internal=False):
+    """Give the task access to tooltool.
+
+    Enables the tooltool cache. Adds releng proxy. Configures scopes.
+
+    By default, only public tooltool access will be granted. Access to internal
+    tooltool can be enabled via ``internal=True``.
+
+    This can only be used with ``run-task`` tasks, as the cache name is
+    reserved for use with ``run-task``.
+    """
+
+    if job["worker"]["implementation"] in ("docker-worker",):
+        add_cache(
+            job,
+            taskdesc,
+            "tooltool-cache",
+            "{workdir}/tooltool-cache".format(**job["run"]),
+        )
+
+        taskdesc["worker"].setdefault("env", {}).update(
+            {
+                "TOOLTOOL_CACHE": "{workdir}/tooltool-cache".format(**job["run"]),
+            }
+        )
+    elif not internal:
+        return
+
+    taskdesc["worker"]["taskcluster-proxy"] = True
+    taskdesc["scopes"].extend(
+        [
+            "project:releng:services/tooltool/api/download/public",
+        ]
+    )
+
+    if internal:
+        taskdesc["scopes"].extend(
+            [
+                "project:releng:services/tooltool/api/download/internal",
+            ]
+        )
+
+
+def get_expiration(config, policy="default"):
+    expires = evaluate_keyed_by(
+        config.graph_config["expiration-policy"],
+        "artifact expiration",
+        {"project": config.params["project"]},
+    )[policy]
+    return expires
diff --git a/taskcluster/gecko_taskgraph/transforms/job/distro_package.py b/taskcluster/gecko_taskgraph/transforms/job/distro_package.py
new file mode 100644
index 0000000000..44236b1abc
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/job/distro_package.py
@@ -0,0 +1,238 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+Support for running spidermonkey jobs via dedicated scripts
+"""
+
+
+import os
+import re
+
+import taskgraph
+from taskgraph.util.schema import Schema
+from taskgraph.util.taskcluster import get_root_url
+from voluptuous import Any, Optional, Required
+
+from gecko_taskgraph import GECKO
+from gecko_taskgraph.transforms.job import run_job_using
+from gecko_taskgraph.transforms.job.common import add_artifacts
+from gecko_taskgraph.util.hash import hash_path
+
+DSC_PACKAGE_RE = re.compile(".*(?=_)")
+SOURCE_PACKAGE_RE = re.compile(r".*(?=[-_]\d)")
+
+source_definition = {
+    Required("url"): str,
+    Required("sha256"): str,
+}
+
+common_schema = Schema(
+    {
+        # URL/SHA256 of a source file to build, which can either be a source
+        # control (.dsc), or a tarball.
+        Required(Any("dsc", "tarball")): source_definition,
+        # Package name. Normally derived from the source control or tarball file
+        # name. Use in case the name doesn't match DSC_PACKAGE_RE or
+        # SOURCE_PACKAGE_RE.
+        Optional("name"): str,
+        # Patch to apply to the extracted source.
+        Optional("patch"): str,
+        # Command to run before dpkg-buildpackage.
+        Optional("pre-build-command"): str,
+        # Architecture to build the package for.
+        Optional("arch"): str,
+        # List of package tasks to get build dependencies from.
+        Optional("packages"): [str],
+        # What resolver to use to install build dependencies. The default
+        # (apt-get) is good in most cases, but in subtle cases involving
+        # a *-backports archive, its solver might not be able to find a
+        # solution that satisfies the build dependencies.
+        Optional("resolver"): Any("apt-get", "aptitude"),
+        # Base work directory used to set up the task.
+        Required("workdir"): str,
+    }
+)
+
+debian_schema = common_schema.extend(
+    {
+        Required("using"): "debian-package",
+        # Debian distribution
+        Required("dist"): str,
+    }
+)
+
+ubuntu_schema = common_schema.extend(
+    {
+        Required("using"): "ubuntu-package",
+        # Ubuntu distribution
+        Required("dist"): str,
+    }
+)
+
+
+def common_package(config, job, taskdesc, distro, version):
+    run = job["run"]
+
+    name = taskdesc["label"].replace(f"{config.kind}-", "", 1)
+
+    arch = run.get("arch", "amd64")
+
+    worker = taskdesc["worker"]
+    worker.setdefault("artifacts", [])
+
+    image = "%s%d" % (distro, version)
+    if arch != "amd64":
+        image += "-" + arch
+    image += "-packages"
+    worker["docker-image"] = {"in-tree": image}
+
+    add_artifacts(config, job, taskdesc, path="/tmp/artifacts")
+
+    env = worker.setdefault("env", {})
+    env["DEBFULLNAME"] = "Mozilla build team"
+    env["DEBEMAIL"] = "dev-builds@lists.mozilla.org"
+
+    if "dsc" in run:
+        src = run["dsc"]
+        unpack = "dpkg-source -x {src_file} {package}"
+        package_re = DSC_PACKAGE_RE
+    elif "tarball" in run:
+        src = run["tarball"]
+        unpack = (
+            "mkdir {package} && "
+            "tar -C {package} -axf {src_file} --strip-components=1"
+        )
+        package_re = SOURCE_PACKAGE_RE
+    else:
+        raise RuntimeError("Unreachable")
+    src_url = src["url"]
+    src_file = os.path.basename(src_url)
+    src_sha256 = src["sha256"]
+    package = run.get("name")
+    if not package:
+        package = package_re.match(src_file).group(0)
+    unpack = unpack.format(src_file=src_file, package=package)
+
+    resolver = run.get("resolver", "apt-get")
+    if resolver == "apt-get":
+        resolver = "apt-get -yyq --no-install-recommends"
+    elif resolver == "aptitude":
+        resolver = (
+            "aptitude -y --without-recommends -o "
+            "Aptitude::ProblemResolver::Hints::KeepBuildDeps="
+            '"reject {}-build-deps :UNINST"'
+        ).format(package)
+    else:
+        raise RuntimeError("Unreachable")
+
+    adjust = ""
+    if "patch" in run:
+        # We don't use robustcheckout or run-task to get a checkout. So for
+        # this one file we'd need from a checkout, download it.
+        env["PATCH_URL"] = config.params.file_url(
+            "build/debian-packages/{patch}".format(patch=run["patch"]),
+        )
+        adjust += "curl -sL $PATCH_URL | patch -p1 && "
+    if "pre-build-command" in run:
+        adjust += run["pre-build-command"] + " && "
+    if "tarball" in run:
+        adjust += "mv ../{src_file} ../{package}_{ver}.orig.tar.gz && ".format(
+            src_file=src_file,
+            package=package,
+            ver="$(dpkg-parsechangelog | awk '$1==\"Version:\"{print $2}' | cut -f 1 -d -)",
+        )
+    if "patch" not in run and "pre-build-command" not in run:
+        adjust += (
+            'debchange -l ".{prefix}moz" --distribution "{dist}"'
+            ' "Mozilla backport for {dist}." < /dev/null && '
+        ).format(
+            prefix=name.split("-", 1)[0],
+            dist=run["dist"],
+        )
+
+    worker["command"] = [
+        "sh",
+        "-x",
+        "-c",
+        # Add sources for packages coming from other package tasks.
+        "/usr/local/sbin/setup_packages.sh {root_url} $PACKAGES && "
+        "apt-get update && "
+        # Upgrade packages that might have new versions in package tasks.
+        "apt-get dist-upgrade && " "cd /tmp && "
+        # Get, validate and extract the package source.
+        "(dget -d -u {src_url} || exit 100) && "
+        'echo "{src_sha256}  {src_file}" | sha256sum -c && '
+        "{unpack} && "
+        "cd {package} && "
+        # Optionally apply patch and/or pre-build command.
+        "{adjust}"
+        # Install the necessary build dependencies.
+        "(cd ..; mk-build-deps -i -r {package}/debian/control -t '{resolver}' || exit 100) && "
+        # Build the package
+        'DEB_BUILD_OPTIONS="parallel=$(nproc) nocheck" dpkg-buildpackage -sa && '
+        # Copy the artifacts
+        "mkdir -p {artifacts}/apt && "
+        "dcmd cp ../{package}_*.changes {artifacts}/apt/ && "
+        "cd {artifacts} && "
+        # Make the artifacts directory usable as an APT repository.
+        "apt-ftparchive sources apt | gzip -c9 > apt/Sources.gz && "
+        "apt-ftparchive packages apt | gzip -c9 > apt/Packages.gz".format(
+            root_url=get_root_url(False),
+            package=package,
+            src_url=src_url,
+            src_file=src_file,
+            src_sha256=src_sha256,
+            unpack=unpack,
+            adjust=adjust,
+            artifacts="/tmp/artifacts",
+            resolver=resolver,
+        ),
+    ]
+
+    if run.get("packages"):
+        env = worker.setdefault("env", {})
+        env["PACKAGES"] = {
+            "task-reference": " ".join(f"<{p}>" for p in run["packages"])
+        }
+        deps = taskdesc.setdefault("dependencies", {})
+        for p in run["packages"]:
+            deps[p] = f"packages-{p}"
+
+    # Use the command generated above as the base for the index hash.
+    # We rely on it not varying depending on the head_repository or head_rev.
+    digest_data = list(worker["command"])
+    if "patch" in run:
+        digest_data.append(
+            hash_path(os.path.join(GECKO, "build", "debian-packages", run["patch"]))
+        )
+
+    if not taskgraph.fast:
+        taskdesc["cache"] = {
+            "type": "packages.v1",
+            "name": name,
+            "digest-data": digest_data,
+        }
+
+
+@run_job_using("docker-worker", "debian-package", schema=debian_schema)
+def docker_worker_debian_package(config, job, taskdesc):
+    run = job["run"]
+    version = {
+        "wheezy": 7,
+        "jessie": 8,
+        "stretch": 9,
+        "buster": 10,
+        "bullseye": 11,
+    }[run["dist"]]
+    common_package(config, job, taskdesc, "debian", version)
+
+
+@run_job_using("docker-worker", "ubuntu-package", schema=ubuntu_schema)
+def docker_worker_ubuntu_package(config, job, taskdesc):
+    run = job["run"]
+    version = {
+        "bionic": 1804,
+        "focal": 2004,
+    }[run["dist"]]
+    common_package(config, job, taskdesc, "ubuntu", version)
diff --git a/taskcluster/gecko_taskgraph/transforms/job/hazard.py b/taskcluster/gecko_taskgraph/transforms/job/hazard.py
new file mode 100644
index 0000000000..af0e8616e0
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/job/hazard.py
@@ -0,0 +1,66 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+Support for running hazard jobs via dedicated scripts
+"""
+
+
+from taskgraph.util.schema import Schema
+from voluptuous import Any, Optional, Required
+
+from gecko_taskgraph.transforms.job import configure_taskdesc_for_run, run_job_using
+from gecko_taskgraph.transforms.job.common import (
+    add_tooltool,
+    docker_worker_add_artifacts,
+    setup_secrets,
+)
+
+haz_run_schema = Schema(
+    {
+        Required("using"): "hazard",
+        # The command to run within the task image (passed through to the worker)
+        Required("command"): str,
+        # The mozconfig to use; default in the script is used if omitted
+        Optional("mozconfig"): str,
+        # The set of secret names to which the task has access; these are prefixed
+        # with `project/releng/gecko/{treeherder.kind}/level-{level}/`.   Setting
+        # this will enable any worker features required and set the task's scopes
+        # appropriately.  `true` here means ['*'], all secrets.  Not supported on
+        # Windows
+        Optional("secrets"): Any(bool, [str]),
+        # Base work directory used to set up the task.
+        Optional("workdir"): str,
+    }
+)
+
+
+@run_job_using("docker-worker", "hazard", schema=haz_run_schema)
+def docker_worker_hazard(config, job, taskdesc):
+    run = job["run"]
+
+    worker = taskdesc["worker"] = job["worker"]
+    worker.setdefault("artifacts", [])
+
+    docker_worker_add_artifacts(config, job, taskdesc)
+    worker.setdefault("required-volumes", []).append(
+        "{workdir}/workspace".format(**run)
+    )
+    add_tooltool(config, job, taskdesc)
+    setup_secrets(config, job, taskdesc)
+
+    env = worker["env"]
+    env.update(
+        {
+            "MOZ_BUILD_DATE": config.params["moz_build_date"],
+            "MOZ_SCM_LEVEL": config.params["level"],
+        }
+    )
+
+    # script parameters
+    if run.get("mozconfig"):
+        env["MOZCONFIG"] = run.pop("mozconfig")
+
+    run["using"] = "run-task"
+    run["cwd"] = run["workdir"]
+    configure_taskdesc_for_run(config, job, taskdesc, worker["implementation"])
diff --git a/taskcluster/gecko_taskgraph/transforms/job/mach.py b/taskcluster/gecko_taskgraph/transforms/job/mach.py
new file mode 100644
index 0000000000..a418b44794
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/job/mach.py
@@ -0,0 +1,83 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+Support for running mach tasks (via run-task)
+"""
+
+from taskgraph.util.schema import Schema, taskref_or_string
+from voluptuous import Any, Optional, Required
+
+from gecko_taskgraph.transforms.job import configure_taskdesc_for_run, run_job_using
+
+mach_schema = Schema(
+    {
+        Required("using"): "mach",
+        # The mach command (omitting `./mach`) to run
+        Required("mach"): taskref_or_string,
+        # The version of Python to run with. Either an absolute path to the binary
+        # on the worker, a version identifier (e.g python2.7 or 3.8). There is no
+        # validation performed to ensure the specified binaries actually exist.
+        Optional("python-version"): Any(str, int, float),
+        # The sparse checkout profile to use. Value is the filename relative to the
+        # directory where sparse profiles are defined (build/sparse-profiles/).
+        Optional("sparse-profile"): Any(str, None),
+        # if true, perform a checkout of a comm-central based branch inside the
+        # gecko checkout
+        Required("comm-checkout"): bool,
+        # Base work directory used to set up the task.
+        Optional("workdir"): str,
+        # Context to substitute into the command using format string
+        # substitution (e.g {value}). This is useful if certain aspects of the
+        # command need to be generated in transforms.
+        Optional("command-context"): dict,
+    }
+)
+
+
+defaults = {
+    "comm-checkout": False,
+}
+
+
+@run_job_using("docker-worker", "mach", schema=mach_schema, defaults=defaults)
+@run_job_using("generic-worker", "mach", schema=mach_schema, defaults=defaults)
+def configure_mach(config, job, taskdesc):
+    run = job["run"]
+    worker = job["worker"]
+
+    additional_prefix = []
+    if worker["os"] == "macosx":
+        additional_prefix = ["LC_ALL=en_US.UTF-8", "LANG=en_US.UTF-8"]
+
+    python = run.get("python-version")
+    if python:
+        del run["python-version"]
+
+        if worker["os"] == "macosx" and python == 3:
+            python = "/usr/local/bin/python3"
+
+        python = str(python)
+        try:
+            float(python)
+            python = "python" + python
+        except ValueError:
+            pass
+
+        additional_prefix.append(python)
+
+    command_prefix = " ".join(additional_prefix + ["./mach "])
+
+    mach = run["mach"]
+    if isinstance(mach, dict):
+        ref, pattern = next(iter(mach.items()))
+        command = {ref: command_prefix + pattern}
+    else:
+        command = command_prefix + mach
+
+    # defer to the run_task implementation
+    run["command"] = command
+    run["cwd"] = "{checkout}"
+    run["using"] = "run-task"
+    del run["mach"]
+    configure_taskdesc_for_run(config, job, taskdesc, job["worker"]["implementation"])
diff --git a/taskcluster/gecko_taskgraph/transforms/job/mozharness.py b/taskcluster/gecko_taskgraph/transforms/job/mozharness.py
new file mode 100644
index 0000000000..3dbcc6e015
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/job/mozharness.py
@@ -0,0 +1,366 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+
+Support for running jobs via mozharness.  Ideally, most stuff gets run this
+way, and certainly anything using mozharness should use this approach.
+
+"""
+
+import json
+from textwrap import dedent
+
+from mozpack import path as mozpath
+from taskgraph.util.schema import Schema
+from voluptuous import Any, Optional, Required
+from voluptuous.validators import Match
+
+from gecko_taskgraph.transforms.job import configure_taskdesc_for_run, run_job_using
+from gecko_taskgraph.transforms.job.common import (
+    docker_worker_add_artifacts,
+    generic_worker_add_artifacts,
+    get_expiration,
+    setup_secrets,
+)
+from gecko_taskgraph.transforms.task import get_branch_repo, get_branch_rev
+from gecko_taskgraph.util.attributes import is_try
+
+mozharness_run_schema = Schema(
+    {
+        Required("using"): "mozharness",
+        # the mozharness script used to run this task, relative to the testing/
+        # directory and using forward slashes even on Windows
+        Required("script"): str,
+        # Additional paths to look for mozharness configs in. These should be
+        # relative to the base of the source checkout
+        Optional("config-paths"): [str],
+        # the config files required for the task, relative to
+        # testing/mozharness/configs or one of the paths specified in
+        # `config-paths` and using forward slashes even on Windows
+        Required("config"): [str],
+        # any additional actions to pass to the mozharness command
+        Optional("actions"): [
+            Match("^[a-z0-9-]+$", "actions must be `-` seperated alphanumeric strings")
+        ],
+        # any additional options (without leading --) to be passed to mozharness
+        Optional("options"): [
+            Match(
+                "^[a-z0-9-]+(=[^ ]+)?$",
+                "options must be `-` seperated alphanumeric strings (with optional argument)",
+            )
+        ],
+        # --custom-build-variant-cfg value
+        Optional("custom-build-variant-cfg"): str,
+        # Extra configuration options to pass to mozharness.
+        Optional("extra-config"): dict,
+        # If not false, tooltool downloads will be enabled via relengAPIProxy
+        # for either just public files, or all files.  Not supported on Windows
+        Required("tooltool-downloads"): Any(
+            False,
+            "public",
+            "internal",
+        ),
+        # The set of secret names to which the task has access; these are prefixed
+        # with `project/releng/gecko/{treeherder.kind}/level-{level}/`.  Setting
+        # this will enable any worker features required and set the task's scopes
+        # appropriately.  `true` here means ['*'], all secrets.  Not supported on
+        # Windows
+        Required("secrets"): Any(bool, [str]),
+        # If true, taskcluster proxy will be enabled; note that it may also be enabled
+        # automatically e.g., for secrets support.  Not supported on Windows.
+        Required("taskcluster-proxy"): bool,
+        # If false, indicate that builds should skip producing artifacts.  Not
+        # supported on Windows.
+        Required("keep-artifacts"): bool,
+        # If specified, use the in-tree job script specified.
+        Optional("job-script"): str,
+        Required("requires-signed-builds"): bool,
+        # Whether or not to use caches.
+        Optional("use-caches"): bool,
+        # If false, don't set MOZ_SIMPLE_PACKAGE_NAME
+        # Only disableable on windows
+        Required("use-simple-package"): bool,
+        # If false don't pass --branch mozharness script
+        # Only disableable on windows
+        Required("use-magic-mh-args"): bool,
+        # if true, perform a checkout of a comm-central based branch inside the
+        # gecko checkout
+        Required("comm-checkout"): bool,
+        # Base work directory used to set up the task.
+        Optional("workdir"): str,
+        Optional("run-as-root"): bool,
+    }
+)
+
+
+mozharness_defaults = {
+    "tooltool-downloads": False,
+    "secrets": False,
+    "taskcluster-proxy": False,
+    "keep-artifacts": True,
+    "requires-signed-builds": False,
+    "use-simple-package": True,
+    "use-magic-mh-args": True,
+    "comm-checkout": False,
+    "run-as-root": False,
+}
+
+
+@run_job_using(
+    "docker-worker",
+    "mozharness",
+    schema=mozharness_run_schema,
+    defaults=mozharness_defaults,
+)
+def mozharness_on_docker_worker_setup(config, job, taskdesc):
+    run = job["run"]
+
+    worker = taskdesc["worker"] = job["worker"]
+
+    if not run.pop("use-simple-package", None):
+        raise NotImplementedError(
+            "Simple packaging cannot be disabled via"
+            "'use-simple-package' on docker-workers"
+        )
+    if not run.pop("use-magic-mh-args", None):
+        raise NotImplementedError(
+            "Cannot disabled mh magic arg passing via"
+            "'use-magic-mh-args' on docker-workers"
+        )
+
+    # Running via mozharness assumes an image that contains build.sh:
+    # by default, debian11-amd64-build, but it could be another image (like
+    # android-build).
+    worker.setdefault("docker-image", {"in-tree": "debian11-amd64-build"})
+
+    worker.setdefault("artifacts", []).append(
+        {
+            "name": "public/logs",
+            "path": "{workdir}/logs/".format(**run),
+            "type": "directory",
+            "expires-after": get_expiration(config, "medium"),
+        }
+    )
+    worker["taskcluster-proxy"] = run.pop("taskcluster-proxy", None)
+    docker_worker_add_artifacts(config, job, taskdesc)
+
+    env = worker.setdefault("env", {})
+    env.update(
+        {
+            "WORKSPACE": "{workdir}/workspace".format(**run),
+            "MOZHARNESS_CONFIG": " ".join(run.pop("config")),
+            "MOZHARNESS_SCRIPT": run.pop("script"),
+            "MH_BRANCH": config.params["project"],
+            "MOZ_SOURCE_CHANGESET": get_branch_rev(config),
+            "MOZ_SOURCE_REPO": get_branch_repo(config),
+            "MH_BUILD_POOL": "taskcluster",
+            "MOZ_BUILD_DATE": config.params["moz_build_date"],
+            "MOZ_SCM_LEVEL": config.params["level"],
+            "PYTHONUNBUFFERED": "1",
+        }
+    )
+
+    worker.setdefault("required-volumes", []).append(env["WORKSPACE"])
+
+    if "actions" in run:
+        env["MOZHARNESS_ACTIONS"] = " ".join(run.pop("actions"))
+
+    if "options" in run:
+        env["MOZHARNESS_OPTIONS"] = " ".join(run.pop("options"))
+
+    if "config-paths" in run:
+        env["MOZHARNESS_CONFIG_PATHS"] = " ".join(run.pop("config-paths"))
+
+    if "custom-build-variant-cfg" in run:
+        env["MH_CUSTOM_BUILD_VARIANT_CFG"] = run.pop("custom-build-variant-cfg")
+
+    extra_config = run.pop("extra-config", {})
+    extra_config["objdir"] = "obj-build"
+    env["EXTRA_MOZHARNESS_CONFIG"] = json.dumps(extra_config, sort_keys=True)
+
+    if "job-script" in run:
+        env["JOB_SCRIPT"] = run["job-script"]
+
+    if is_try(config.params):
+        env["TRY_COMMIT_MSG"] = config.params["message"]
+
+    # if we're not keeping artifacts, set some env variables to empty values
+    # that will cause the build process to skip copying the results to the
+    # artifacts directory.  This will have no effect for operations that are
+    # not builds.
+    if not run.pop("keep-artifacts"):
+        env["DIST_TARGET_UPLOADS"] = ""
+        env["DIST_UPLOADS"] = ""
+
+    # Retry if mozharness returns TBPL_RETRY
+    worker["retry-exit-status"] = [4]
+
+    setup_secrets(config, job, taskdesc)
+
+    run["using"] = "run-task"
+    run["command"] = mozpath.join(
+        "${GECKO_PATH}",
+        run.pop("job-script", "taskcluster/scripts/builder/build-linux.sh"),
+    )
+    run.pop("secrets")
+    run.pop("requires-signed-builds")
+
+    configure_taskdesc_for_run(config, job, taskdesc, worker["implementation"])
+
+
+@run_job_using(
+    "generic-worker",
+    "mozharness",
+    schema=mozharness_run_schema,
+    defaults=mozharness_defaults,
+)
+def mozharness_on_generic_worker(config, job, taskdesc):
+    assert job["worker"]["os"] in (
+        "windows",
+        "macosx",
+    ), "only supports windows and macOS right now: {}".format(job["label"])
+
+    run = job["run"]
+
+    # fail if invalid run options are included
+    invalid = []
+    if not run.pop("keep-artifacts", True):
+        invalid.append("keep-artifacts")
+    if invalid:
+        raise Exception(
+            "Jobs run using mozharness on Windows do not support properties "
+            + ", ".join(invalid)
+        )
+
+    worker = taskdesc["worker"] = job["worker"]
+
+    worker["taskcluster-proxy"] = run.pop("taskcluster-proxy", None)
+
+    setup_secrets(config, job, taskdesc)
+
+    taskdesc["worker"].setdefault("artifacts", []).append(
+        {
+            "name": "public/logs",
+            "path": "logs",
+            "type": "directory",
+            "expires-after": get_expiration(config, "medium"),
+        }
+    )
+
+    if not worker.get("skip-artifacts", False):
+        generic_worker_add_artifacts(config, job, taskdesc)
+
+    env = worker.setdefault("env", {})
+    env.update(
+        {
+            "MOZ_BUILD_DATE": config.params["moz_build_date"],
+            "MOZ_SCM_LEVEL": config.params["level"],
+            "MH_BRANCH": config.params["project"],
+            "MOZ_SOURCE_CHANGESET": get_branch_rev(config),
+            "MOZ_SOURCE_REPO": get_branch_repo(config),
+        }
+    )
+    if run.pop("use-simple-package"):
+        env.update({"MOZ_SIMPLE_PACKAGE_NAME": "target"})
+
+    extra_config = run.pop("extra-config", {})
+    extra_config["objdir"] = "obj-build"
+    env["EXTRA_MOZHARNESS_CONFIG"] = json.dumps(extra_config, sort_keys=True)
+
+    # The windows generic worker uses batch files to pass environment variables
+    # to commands.  Setting a variable to empty in a batch file unsets, so if
+    # there is no `TRY_COMMIT_MESSAGE`, pass a space instead, so that
+    # mozharness doesn't try to find the commit message on its own.
+    if is_try(config.params):
+        env["TRY_COMMIT_MSG"] = config.params["message"] or "no commit message"
+
+    if not job["attributes"]["build_platform"].startswith(("win", "macosx")):
+        raise Exception(
+            "Task generation for mozharness build jobs currently only supported on "
+            "Windows and macOS"
+        )
+
+    mh_command = []
+    if job["worker"]["os"] == "windows":
+        system_python_dir = "c:/mozilla-build/python3/"
+        gecko_path = "%GECKO_PATH%"
+    else:
+        system_python_dir = ""
+        gecko_path = "$GECKO_PATH"
+
+    if run.get("use-system-python", True):
+        python_bindir = system_python_dir
+    else:
+        # $MOZ_PYTHON_HOME is going to be substituted in run-task, when we
+        # know the actual MOZ_PYTHON_HOME value.
+        is_windows = job["worker"]["os"] == "windows"
+        if is_windows:
+            python_bindir = "%MOZ_PYTHON_HOME%/"
+        else:
+            python_bindir = "${MOZ_PYTHON_HOME}/bin/"
+
+    mh_command = ["{}python3".format(python_bindir)]
+
+    mh_command += [
+        f"{gecko_path}/mach",
+        "python",
+        "{}/testing/{}".format(gecko_path, run.pop("script")),
+    ]
+
+    for path in run.pop("config-paths", []):
+        mh_command.append(f"--extra-config-path {gecko_path}/{path}")
+
+    for cfg in run.pop("config"):
+        mh_command.extend(("--config", cfg))
+    if run.pop("use-magic-mh-args"):
+        mh_command.extend(("--branch", config.params["project"]))
+    if job["worker"]["os"] == "windows":
+        mh_command.extend(("--work-dir", r"%cd:Z:=z:%\workspace"))
+    for action in run.pop("actions", []):
+        mh_command.append("--" + action)
+
+    for option in run.pop("options", []):
+        mh_command.append("--" + option)
+    if run.get("custom-build-variant-cfg"):
+        mh_command.append("--custom-build-variant")
+        mh_command.append(run.pop("custom-build-variant-cfg"))
+
+    if job["worker"]["os"] == "macosx":
+        # Ideally, we'd use shellutil.quote, but that would single-quote
+        # $GECKO_PATH, which would defeat having the variable in the command
+        # in the first place, as it wouldn't be expanded.
+        # In practice, arguments are expected not to contain characters that
+        # would require quoting.
+        mh_command = " ".join(mh_command)
+
+    run["using"] = "run-task"
+    run["command"] = mh_command
+    run.pop("secrets")
+    run.pop("requires-signed-builds")
+    run.pop("job-script", None)
+    configure_taskdesc_for_run(config, job, taskdesc, worker["implementation"])
+
+    # Everything past this point is Windows-specific.
+    if job["worker"]["os"] == "macosx":
+        return
+
+    if taskdesc.get("use-sccache"):
+        worker["command"] = (
+            [
+                # Make the comment part of the first command, as it will help users to
+                # understand what is going on, and why these steps are implemented.
+                dedent(
+                    """\
+            :: sccache currently uses the full compiler commandline as input to the
+            :: cache hash key, so create a symlink to the task dir and build from
+            :: the symlink dir to get consistent paths.
+            if exist z:\\build rmdir z:\\build"""
+                ),
+                r"mklink /d z:\build %cd%",
+                # Grant delete permission on the link to everyone.
+                r"icacls z:\build /grant *S-1-1-0:D /L",
+                r"cd /d z:\build",
+            ]
+            + worker["command"]
+        )
diff --git a/taskcluster/gecko_taskgraph/transforms/job/mozharness_test.py b/taskcluster/gecko_taskgraph/transforms/job/mozharness_test.py
new file mode 100644
index 0000000000..eb4aea609f
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/job/mozharness_test.py
@@ -0,0 +1,477 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+
+import json
+import os
+import re
+
+from taskgraph.util.schema import Schema
+from taskgraph.util.taskcluster import get_artifact_path, get_artifact_url
+from voluptuous import Extra, Optional, Required
+
+from gecko_taskgraph.transforms.job import configure_taskdesc_for_run, run_job_using
+from gecko_taskgraph.transforms.job.common import get_expiration, support_vcs_checkout
+from gecko_taskgraph.transforms.test import normpath, test_description_schema
+from gecko_taskgraph.util.attributes import is_try
+
+VARIANTS = [
+    "shippable",
+    "shippable-qr",
+    "shippable-lite",
+    "shippable-lite-qr",
+    "devedition",
+    "pgo",
+    "asan",
+    "stylo",
+    "qr",
+    "ccov",
+]
+
+
+def get_variant(test_platform):
+    for v in VARIANTS:
+        if f"-{v}/" in test_platform:
+            return v
+    return ""
+
+
+mozharness_test_run_schema = Schema(
+    {
+        Required("using"): "mozharness-test",
+        Required("test"): {
+            Required("test-platform"): str,
+            Required("mozharness"): test_description_schema["mozharness"],
+            Required("docker-image"): test_description_schema["docker-image"],
+            Required("loopback-video"): test_description_schema["loopback-video"],
+            Required("loopback-audio"): test_description_schema["loopback-audio"],
+            Required("max-run-time"): test_description_schema["max-run-time"],
+            Optional("retry-exit-status"): test_description_schema["retry-exit-status"],
+            Extra: object,
+        },
+        # Base work directory used to set up the task.
+        Optional("workdir"): str,
+    }
+)
+
+
+def test_packages_url(taskdesc):
+    """Account for different platforms that name their test packages differently"""
+    artifact_url = get_artifact_url(
+        "<build>", get_artifact_path(taskdesc, "target.test_packages.json")
+    )
+    # for android shippable we need to add 'en-US' to the artifact url
+    test = taskdesc["run"]["test"]
+    if "android" in test["test-platform"] and (
+        get_variant(test["test-platform"])
+        in ("shippable", "shippable-qr", "shippable-lite", "shippable-lite-qr")
+    ):
+        head, tail = os.path.split(artifact_url)
+        artifact_url = os.path.join(head, "en-US", tail)
+    return artifact_url
+
+
+def installer_url(taskdesc):
+    test = taskdesc["run"]["test"]
+    mozharness = test["mozharness"]
+
+    if "installer-url" in mozharness:
+        installer_url = mozharness["installer-url"]
+    else:
+        upstream_task = (
+            "<build-signing>" if mozharness["requires-signed-builds"] else "<build>"
+        )
+        installer_url = get_artifact_url(
+            upstream_task, mozharness["build-artifact-name"]
+        )
+
+    return installer_url
+
+
+@run_job_using("docker-worker", "mozharness-test", schema=mozharness_test_run_schema)
+def mozharness_test_on_docker(config, job, taskdesc):
+    run = job["run"]
+    test = taskdesc["run"]["test"]
+    mozharness = test["mozharness"]
+    worker = taskdesc["worker"] = job["worker"]
+
+    # apply some defaults
+    worker["docker-image"] = test["docker-image"]
+    worker["allow-ptrace"] = True  # required for all tests, for crashreporter
+    worker["loopback-video"] = test["loopback-video"]
+    worker["loopback-audio"] = test["loopback-audio"]
+    worker["max-run-time"] = test["max-run-time"]
+    worker["retry-exit-status"] = test["retry-exit-status"]
+    if "android-em-7.0-x86" in test["test-platform"]:
+        worker["privileged"] = True
+
+    artifacts = [
+        # (artifact name prefix, in-image path)
+        ("public/logs", "{workdir}/workspace/logs/".format(**run)),
+        ("public/test", "{workdir}/artifacts/".format(**run)),
+        (
+            "public/test_info",
+            "{workdir}/workspace/build/blobber_upload_dir/".format(**run),
+        ),
+    ]
+
+    installer = installer_url(taskdesc)
+
+    mozharness_url = get_artifact_url(
+        "<build>", get_artifact_path(taskdesc, "mozharness.zip")
+    )
+
+    worker.setdefault("artifacts", [])
+    worker["artifacts"].extend(
+        [
+            {
+                "name": prefix,
+                "path": os.path.join("{workdir}/workspace".format(**run), path),
+                "type": "directory",
+                "expires-after": get_expiration(config, "default"),
+            }
+            for (prefix, path) in artifacts
+        ]
+    )
+
+    env = worker.setdefault("env", {})
+    env.update(
+        {
+            "MOZHARNESS_CONFIG": " ".join(mozharness["config"]),
+            "MOZHARNESS_SCRIPT": mozharness["script"],
+            "MOZILLA_BUILD_URL": {"task-reference": installer},
+            "NEED_PULSEAUDIO": "true",
+            "NEED_WINDOW_MANAGER": "true",
+            "ENABLE_E10S": str(bool(test.get("e10s"))).lower(),
+            "WORKING_DIR": "/builds/worker",
+        }
+    )
+
+    env["PYTHON"] = "python3"
+
+    # Legacy linux64 tests rely on compiz.
+    if test.get("docker-image", {}).get("in-tree") == "desktop1604-test":
+        env.update({"NEED_COMPIZ": "true"})
+
+    # Bug 1602701/1601828 - use compiz on ubuntu1804 due to GTK asynchiness
+    # when manipulating windows.
+    if test.get("docker-image", {}).get("in-tree") == "ubuntu1804-test":
+        if "wdspec" in job["run"]["test"]["suite"] or (
+            "marionette" in job["run"]["test"]["suite"]
+            and "headless" not in job["label"]
+        ):
+            env.update({"NEED_COMPIZ": "true"})
+
+    # Set MOZ_ENABLE_WAYLAND env variables to enable Wayland backend.
+    if "wayland" in job["label"]:
+        env["MOZ_ENABLE_WAYLAND"] = "1"
+
+    if mozharness.get("mochitest-flavor"):
+        env["MOCHITEST_FLAVOR"] = mozharness["mochitest-flavor"]
+
+    if mozharness["set-moz-node-path"]:
+        env["MOZ_NODE_PATH"] = "/usr/local/bin/node"
+
+    if "actions" in mozharness:
+        env["MOZHARNESS_ACTIONS"] = " ".join(mozharness["actions"])
+
+    if is_try(config.params):
+        env["TRY_COMMIT_MSG"] = config.params["message"]
+
+    # handle some of the mozharness-specific options
+    if test["reboot"]:
+        raise Exception(
+            "reboot: {} not supported on generic-worker".format(test["reboot"])
+        )
+
+    # Support vcs checkouts regardless of whether the task runs from
+    # source or not in case it is needed on an interactive loaner.
+    support_vcs_checkout(config, job, taskdesc)
+
+    # If we have a source checkout, run mozharness from it instead of
+    # downloading a zip file with the same content.
+    if test["checkout"]:
+        env["MOZHARNESS_PATH"] = "{workdir}/checkouts/gecko/testing/mozharness".format(
+            **run
+        )
+    else:
+        env["MOZHARNESS_URL"] = {"task-reference": mozharness_url}
+
+    extra_config = {
+        "installer_url": installer,
+        "test_packages_url": test_packages_url(taskdesc),
+    }
+    env["EXTRA_MOZHARNESS_CONFIG"] = {
+        "task-reference": json.dumps(extra_config, sort_keys=True)
+    }
+
+    # Bug 1634554 - pass in decision task artifact URL to mozharness for WPT.
+    # Bug 1645974 - test-verify-wpt and test-coverage-wpt need artifact URL.
+    if "web-platform-tests" in test["suite"] or re.match(
+        "test-(coverage|verify)-wpt", test["suite"]
+    ):
+        env["TESTS_BY_MANIFEST_URL"] = {
+            "artifact-reference": "<decision/public/tests-by-manifest.json.gz>"
+        }
+
+    command = [
+        "{workdir}/bin/test-linux.sh".format(**run),
+    ]
+    command.extend(mozharness.get("extra-options", []))
+
+    if test.get("test-manifests"):
+        env["MOZHARNESS_TEST_PATHS"] = json.dumps(
+            {test["suite"]: test["test-manifests"]}, sort_keys=True
+        )
+
+    # TODO: remove the need for run['chunked']
+    elif mozharness.get("chunked") or test["chunks"] > 1:
+        command.append("--total-chunk={}".format(test["chunks"]))
+        command.append("--this-chunk={}".format(test["this-chunk"]))
+
+    if "download-symbols" in mozharness:
+        download_symbols = mozharness["download-symbols"]
+        download_symbols = {True: "true", False: "false"}.get(
+            download_symbols, download_symbols
+        )
+        command.append("--download-symbols=" + download_symbols)
+
+    job["run"] = {
+        "workdir": run["workdir"],
+        "tooltool-downloads": mozharness["tooltool-downloads"],
+        "checkout": test["checkout"],
+        "command": command,
+        "using": "run-task",
+    }
+    configure_taskdesc_for_run(config, job, taskdesc, worker["implementation"])
+
+
+@run_job_using("generic-worker", "mozharness-test", schema=mozharness_test_run_schema)
+def mozharness_test_on_generic_worker(config, job, taskdesc):
+    test = taskdesc["run"]["test"]
+    mozharness = test["mozharness"]
+    worker = taskdesc["worker"] = job["worker"]
+
+    bitbar_script = "test-linux.sh"
+
+    is_macosx = worker["os"] == "macosx"
+    is_windows = worker["os"] == "windows"
+    is_linux = worker["os"] == "linux" or worker["os"] == "linux-bitbar"
+    is_bitbar = worker["os"] == "linux-bitbar"
+    assert is_macosx or is_windows or is_linux
+
+    artifacts = [
+        {
+            "name": "public/logs",
+            "path": "logs",
+            "type": "directory",
+            "expires-after": get_expiration(config, "default"),
+        }
+    ]
+
+    # jittest doesn't have blob_upload_dir
+    if test["test-name"] != "jittest":
+        artifacts.append(
+            {
+                "name": "public/test_info",
+                "path": "build/blobber_upload_dir",
+                "type": "directory",
+                "expires-after": get_expiration(config, "default"),
+            }
+        )
+
+    if is_bitbar:
+        artifacts = [
+            {
+                "name": "public/test/",
+                "path": "artifacts/public",
+                "type": "directory",
+                "expires-after": get_expiration(config, "default"),
+            },
+            {
+                "name": "public/logs/",
+                "path": "workspace/logs",
+                "type": "directory",
+                "expires-after": get_expiration(config, "default"),
+            },
+            {
+                "name": "public/test_info/",
+                "path": "workspace/build/blobber_upload_dir",
+                "type": "directory",
+                "expires-after": get_expiration(config, "default"),
+            },
+        ]
+
+    installer = installer_url(taskdesc)
+
+    worker["os-groups"] = test["os-groups"]
+
+    # run-as-administrator is a feature for workers with UAC enabled and as such should not be
+    # included in tasks on workers that have UAC disabled. Currently UAC is only enabled on
+    # gecko Windows 10 workers, however this may be subject to change. Worker type
+    # environment definitions can be found in https://github.com/mozilla-releng/OpenCloudConfig
+    # See https://docs.microsoft.com/en-us/windows/desktop/secauthz/user-account-control
+    # for more information about UAC.
+    if test.get("run-as-administrator", False):
+        if job["worker-type"].startswith("win10-64") or job["worker-type"].startswith(
+            "win11-64"
+        ):
+            worker["run-as-administrator"] = True
+        else:
+            raise Exception(
+                "run-as-administrator not supported on {}".format(job["worker-type"])
+            )
+
+    if test["reboot"]:
+        raise Exception(
+            "reboot: {} not supported on generic-worker".format(test["reboot"])
+        )
+
+    worker["max-run-time"] = test["max-run-time"]
+    worker["retry-exit-status"] = test["retry-exit-status"]
+    worker.setdefault("artifacts", [])
+    worker["artifacts"].extend(artifacts)
+
+    env = worker.setdefault("env", {})
+    env["GECKO_HEAD_REPOSITORY"] = config.params["head_repository"]
+    env["GECKO_HEAD_REV"] = config.params["head_rev"]
+
+    # this list will get cleaned up / reduced / removed in bug 1354088
+    if is_macosx:
+        env.update(
+            {
+                "LC_ALL": "en_US.UTF-8",
+                "LANG": "en_US.UTF-8",
+                "MOZ_NODE_PATH": "/usr/local/bin/node",
+                "PATH": "/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin",
+                "SHELL": "/bin/bash",
+            }
+        )
+    elif is_bitbar:
+        env.update(
+            {
+                "LANG": "en_US.UTF-8",
+                "MOZHARNESS_CONFIG": " ".join(mozharness["config"]),
+                "MOZHARNESS_SCRIPT": mozharness["script"],
+                "MOZHARNESS_URL": {
+                    "artifact-reference": "<build/public/build/mozharness.zip>"
+                },
+                "MOZILLA_BUILD_URL": {"task-reference": installer},
+                "MOZ_NO_REMOTE": "1",
+                "NEED_XVFB": "false",
+                "XPCOM_DEBUG_BREAK": "warn",
+                "NO_FAIL_ON_TEST_ERRORS": "1",
+                "MOZ_HIDE_RESULTS_TABLE": "1",
+                "MOZ_NODE_PATH": "/usr/local/bin/node",
+                "TASKCLUSTER_WORKER_TYPE": job["worker-type"],
+            }
+        )
+
+    extra_config = {
+        "installer_url": installer,
+        "test_packages_url": test_packages_url(taskdesc),
+    }
+    env["EXTRA_MOZHARNESS_CONFIG"] = {
+        "task-reference": json.dumps(extra_config, sort_keys=True)
+    }
+
+    # Bug 1634554 - pass in decision task artifact URL to mozharness for WPT.
+    # Bug 1645974 - test-verify-wpt and test-coverage-wpt need artifact URL.
+    if "web-platform-tests" in test["suite"] or re.match(
+        "test-(coverage|verify)-wpt", test["suite"]
+    ):
+        env["TESTS_BY_MANIFEST_URL"] = {
+            "artifact-reference": "<decision/public/tests-by-manifest.json.gz>"
+        }
+
+    if is_windows:
+        py_binary = "c:\\mozilla-build\\{python}\\{python}.exe".format(python="python3")
+        mh_command = [
+            py_binary,
+            "-u",
+            "mozharness\\scripts\\" + normpath(mozharness["script"]),
+        ]
+    elif is_bitbar:
+        py_binary = "python3"
+        mh_command = ["bash", f"./{bitbar_script}"]
+    elif is_macosx:
+        py_binary = "/usr/local/bin/{}".format("python3")
+        mh_command = [
+            py_binary,
+            "-u",
+            "mozharness/scripts/" + mozharness["script"],
+        ]
+    else:
+        # is_linux
+        py_binary = "/usr/bin/{}".format("python3")
+        mh_command = [
+            # Using /usr/bin/python2.7 rather than python2.7 because
+            # /usr/local/bin/python2.7 is broken on the mac workers.
+            # See bug #1547903.
+            py_binary,
+            "-u",
+            "mozharness/scripts/" + mozharness["script"],
+        ]
+
+    env["PYTHON"] = py_binary
+
+    for mh_config in mozharness["config"]:
+        cfg_path = "mozharness/configs/" + mh_config
+        if is_windows:
+            cfg_path = normpath(cfg_path)
+        mh_command.extend(["--cfg", cfg_path])
+    mh_command.extend(mozharness.get("extra-options", []))
+    if mozharness.get("download-symbols"):
+        if isinstance(mozharness["download-symbols"], str):
+            mh_command.extend(["--download-symbols", mozharness["download-symbols"]])
+        else:
+            mh_command.extend(["--download-symbols", "true"])
+    if mozharness.get("include-blob-upload-branch"):
+        mh_command.append("--blob-upload-branch=" + config.params["project"])
+
+    if test.get("test-manifests"):
+        env["MOZHARNESS_TEST_PATHS"] = json.dumps(
+            {test["suite"]: test["test-manifests"]}, sort_keys=True
+        )
+
+    # TODO: remove the need for run['chunked']
+    elif mozharness.get("chunked") or test["chunks"] > 1:
+        mh_command.append("--total-chunk={}".format(test["chunks"]))
+        mh_command.append("--this-chunk={}".format(test["this-chunk"]))
+
+    if is_try(config.params):
+        env["TRY_COMMIT_MSG"] = config.params["message"]
+
+    worker["mounts"] = [
+        {
+            "directory": "mozharness",
+            "content": {
+                "artifact": get_artifact_path(taskdesc, "mozharness.zip"),
+                "task-id": {"task-reference": "<build>"},
+            },
+            "format": "zip",
+        }
+    ]
+    if is_bitbar:
+        a_url = config.params.file_url(
+            f"taskcluster/scripts/tester/{bitbar_script}",
+        )
+        worker["mounts"] = [
+            {
+                "file": bitbar_script,
+                "content": {
+                    "url": a_url,
+                },
+            }
+        ]
+
+    job["run"] = {
+        "tooltool-downloads": mozharness["tooltool-downloads"],
+        "checkout": test["checkout"],
+        "command": mh_command,
+        "using": "run-task",
+    }
+    if is_bitbar:
+        job["run"]["run-as-root"] = True
+    configure_taskdesc_for_run(config, job, taskdesc, worker["implementation"])
diff --git a/taskcluster/gecko_taskgraph/transforms/job/python_test.py b/taskcluster/gecko_taskgraph/transforms/job/python_test.py
new file mode 100644
index 0000000000..b572061217
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/job/python_test.py
@@ -0,0 +1,47 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+Support for running mach python-test tasks (via run-task)
+"""
+
+
+from taskgraph.util.schema import Schema
+from voluptuous import Optional, Required
+
+from gecko_taskgraph.transforms.job import configure_taskdesc_for_run, run_job_using
+
+python_test_schema = Schema(
+    {
+        Required("using"): "python-test",
+        # Python version to use
+        Required("python-version"): int,
+        # The subsuite to run
+        Required("subsuite"): str,
+        # Base work directory used to set up the task.
+        Optional("workdir"): str,
+    }
+)
+
+
+defaults = {
+    "python-version": 3,
+    "subsuite": "default",
+}
+
+
+@run_job_using(
+    "docker-worker", "python-test", schema=python_test_schema, defaults=defaults
+)
+@run_job_using(
+    "generic-worker", "python-test", schema=python_test_schema, defaults=defaults
+)
+def configure_python_test(config, job, taskdesc):
+    run = job["run"]
+    worker = job["worker"]
+
+    # defer to the mach implementation
+    run["mach"] = ("python-test --subsuite {subsuite} --run-slow").format(**run)
+    run["using"] = "mach"
+    del run["subsuite"]
+    configure_taskdesc_for_run(config, job, taskdesc, worker["implementation"])
diff --git a/taskcluster/gecko_taskgraph/transforms/job/run_task.py b/taskcluster/gecko_taskgraph/transforms/job/run_task.py
new file mode 100644
index 0000000000..201c0b825a
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/job/run_task.py
@@ -0,0 +1,308 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+Support for running jobs that are invoked via the `run-task` script.
+"""
+
+
+import os
+
+from mozbuild.util import memoize
+from mozpack import path
+from taskgraph.util.schema import Schema
+from taskgraph.util.yaml import load_yaml
+from voluptuous import Any, Extra, Optional, Required
+
+from gecko_taskgraph import GECKO
+from gecko_taskgraph.transforms.job import run_job_using
+from gecko_taskgraph.transforms.job.common import add_tooltool, support_vcs_checkout
+from gecko_taskgraph.transforms.task import taskref_or_string
+
+run_task_schema = Schema(
+    {
+        Required("using"): "run-task",
+        # if true, add a cache at ~worker/.cache, which is where things like pip
+        # tend to hide their caches.  This cache is never added for level-1 jobs.
+        # TODO Once bug 1526028 is fixed, this and 'use-caches' should be merged.
+        Required("cache-dotcache"): bool,
+        # Whether or not to use caches.
+        Optional("use-caches"): bool,
+        # if true (the default), perform a checkout of gecko on the worker
+        Required("checkout"): bool,
+        Optional(
+            "cwd",
+            description="Path to run command in. If a checkout is present, the path "
+            "to the checkout will be interpolated with the key `checkout`",
+        ): str,
+        # The sparse checkout profile to use. Value is the filename relative to
+        # "sparse-profile-prefix" which defaults to "build/sparse-profiles/".
+        Required("sparse-profile"): Any(str, None),
+        # The relative path to the sparse profile.
+        Optional("sparse-profile-prefix"): str,
+        # if true, perform a checkout of a comm-central based branch inside the
+        # gecko checkout
+        Required("comm-checkout"): bool,
+        # The command arguments to pass to the `run-task` script, after the
+        # checkout arguments.  If a list, it will be passed directly; otherwise
+        # it will be included in a single argument to `bash -cx`.
+        Required("command"): Any([taskref_or_string], taskref_or_string),
+        # Context to substitute into the command using format string
+        # substitution (e.g {value}). This is useful if certain aspects of the
+        # command need to be generated in transforms.
+        Optional("command-context"): {
+            # If present, loads a set of context variables from an unnested yaml
+            # file. If a value is present in both the provided file and directly
+            # in command-context, the latter will take priority.
+            Optional("from-file"): str,
+            Extra: object,
+        },
+        # Base work directory used to set up the task.
+        Optional("workdir"): str,
+        # If not false, tooltool downloads will be enabled via relengAPIProxy
+        # for either just public files, or all files. Only supported on
+        # docker-worker.
+        Required("tooltool-downloads"): Any(
+            False,
+            "public",
+            "internal",
+        ),
+        # Whether to run as root. (defaults to False)
+        Optional("run-as-root"): bool,
+    }
+)
+
+
+def common_setup(config, job, taskdesc, command):
+    run = job["run"]
+    if run["checkout"]:
+        support_vcs_checkout(config, job, taskdesc, sparse=bool(run["sparse-profile"]))
+        command.append(
+            "--gecko-checkout={}".format(taskdesc["worker"]["env"]["GECKO_PATH"])
+        )
+
+    if run["sparse-profile"]:
+        sparse_profile_prefix = run.pop(
+            "sparse-profile-prefix", "build/sparse-profiles"
+        )
+        sparse_profile_path = path.join(sparse_profile_prefix, run["sparse-profile"])
+        command.append(f"--gecko-sparse-profile={sparse_profile_path}")
+
+    taskdesc["worker"].setdefault("env", {})["MOZ_SCM_LEVEL"] = config.params["level"]
+
+
+worker_defaults = {
+    "cache-dotcache": False,
+    "checkout": True,
+    "comm-checkout": False,
+    "sparse-profile": None,
+    "tooltool-downloads": False,
+    "run-as-root": False,
+}
+
+
+load_yaml = memoize(load_yaml)
+
+
+def script_url(config, script):
+    if "MOZ_AUTOMATION" in os.environ and "TASK_ID" not in os.environ:
+        raise Exception("TASK_ID must be defined to use run-task on generic-worker")
+    task_id = os.environ.get("TASK_ID", "<TASK_ID>")
+    tc_url = "http://firefox-ci-tc.services.mozilla.com"
+    return f"{tc_url}/api/queue/v1/task/{task_id}/artifacts/public/{script}"
+
+
+def substitute_command_context(command_context, command):
+    from_file = command_context.pop("from-file", None)
+    full_context = {}
+    if from_file:
+        full_context = load_yaml(os.path.join(GECKO, from_file))
+    else:
+        full_context = {}
+
+    full_context.update(command_context)
+
+    if isinstance(command, list):
+        for i in range(len(command)):
+            command[i] = command[i].format(**full_context)
+    else:
+        command = command.format(**full_context)
+
+    return command
+
+
+@run_job_using(
+    "docker-worker", "run-task", schema=run_task_schema, defaults=worker_defaults
+)
+def docker_worker_run_task(config, job, taskdesc):
+    run = job["run"]
+    worker = taskdesc["worker"] = job["worker"]
+    command = ["/builds/worker/bin/run-task"]
+    common_setup(config, job, taskdesc, command)
+
+    if run["tooltool-downloads"]:
+        internal = run["tooltool-downloads"] == "internal"
+        add_tooltool(config, job, taskdesc, internal=internal)
+
+    if run.get("cache-dotcache"):
+        worker["caches"].append(
+            {
+                "type": "persistent",
+                "name": "{project}-dotcache".format(**config.params),
+                "mount-point": "{workdir}/.cache".format(**run),
+                "skip-untrusted": True,
+            }
+        )
+
+    if run.get("command-context"):
+        run_command = substitute_command_context(
+            run.get("command-context"), run["command"]
+        )
+    else:
+        run_command = run["command"]
+
+    run_cwd = run.get("cwd")
+    if run_cwd and run["checkout"]:
+        run_cwd = path.normpath(
+            run_cwd.format(checkout=taskdesc["worker"]["env"]["GECKO_PATH"])
+        )
+    elif run_cwd and "{checkout}" in run_cwd:
+        raise Exception(
+            "Found `{{checkout}}` interpolation in `cwd` for task {name} "
+            "but the task doesn't have a checkout: {cwd}".format(
+                cwd=run_cwd, name=job.get("name", job.get("label"))
+            )
+        )
+
+    # dict is for the case of `{'task-reference': text_type}`.
+    if isinstance(run_command, (str, dict)):
+        run_command = ["bash", "-cx", run_command]
+    if run["comm-checkout"]:
+        command.append(
+            "--comm-checkout={}/comm".format(taskdesc["worker"]["env"]["GECKO_PATH"])
+        )
+    if run["run-as-root"]:
+        command.extend(("--user", "root", "--group", "root"))
+    if run_cwd:
+        command.extend(("--task-cwd", run_cwd))
+    command.append("--")
+    command.extend(run_command)
+    worker["command"] = command
+
+
+@run_job_using(
+    "generic-worker", "run-task", schema=run_task_schema, defaults=worker_defaults
+)
+def generic_worker_run_task(config, job, taskdesc):
+    run = job["run"]
+    worker = taskdesc["worker"] = job["worker"]
+    is_win = worker["os"] == "windows"
+    is_mac = worker["os"] == "macosx"
+    is_bitbar = worker["os"] == "linux-bitbar"
+
+    if run["tooltool-downloads"]:
+        internal = run["tooltool-downloads"] == "internal"
+        add_tooltool(config, job, taskdesc, internal=internal)
+
+    if is_win:
+        command = ["C:/mozilla-build/python3/python3.exe", "run-task"]
+    elif is_mac:
+        command = ["/usr/local/bin/python3", "run-task"]
+    else:
+        command = ["./run-task"]
+
+    common_setup(config, job, taskdesc, command)
+
+    worker.setdefault("mounts", [])
+    if run.get("cache-dotcache"):
+        worker["mounts"].append(
+            {
+                "cache-name": "{project}-dotcache".format(**config.params),
+                "directory": "{workdir}/.cache".format(**run),
+            }
+        )
+    worker["mounts"].append(
+        {
+            "content": {
+                "url": script_url(config, "run-task"),
+            },
+            "file": "./run-task",
+        }
+    )
+    if job.get("fetches", {}):
+        worker["mounts"].append(
+            {
+                "content": {
+                    "url": script_url(config, "fetch-content"),
+                },
+                "file": "./fetch-content",
+            }
+        )
+
+    run_command = run["command"]
+    run_cwd = run.get("cwd")
+    if run_cwd and run["checkout"]:
+        run_cwd = path.normpath(
+            run_cwd.format(checkout=taskdesc["worker"]["env"]["GECKO_PATH"])
+        )
+    elif run_cwd and "{checkout}" in run_cwd:
+        raise Exception(
+            "Found `{{checkout}}` interpolation in `cwd` for task {name} "
+            "but the task doesn't have a checkout: {cwd}".format(
+                cwd=run_cwd, name=job.get("name", job.get("label"))
+            )
+        )
+
+    # dict is for the case of `{'task-reference': text_type}`.
+    if isinstance(run_command, (str, dict)):
+        if is_win:
+            if isinstance(run_command, dict):
+                for k in run_command.keys():
+                    run_command[k] = f'"{run_command[k]}"'
+            else:
+                run_command = f'"{run_command}"'
+        run_command = ["bash", "-cx", run_command]
+
+    if run.get("command-context"):
+        run_command = substitute_command_context(
+            run.get("command-context"), run_command
+        )
+
+    if run["comm-checkout"]:
+        command.append(
+            "--comm-checkout={}/comm".format(taskdesc["worker"]["env"]["GECKO_PATH"])
+        )
+
+    if run["run-as-root"]:
+        command.extend(("--user", "root", "--group", "root"))
+    if run_cwd:
+        command.extend(("--task-cwd", run_cwd))
+    command.append("--")
+    if is_bitbar:
+        # Use the bitbar wrapper script which sets up the device and adb
+        # environment variables
+        command.append("/builds/taskcluster/script.py")
+    command.extend(run_command)
+
+    if is_win:
+        taskref = False
+        for c in command:
+            if isinstance(c, dict):
+                taskref = True
+
+        if taskref:
+            cmd = []
+            for c in command:
+                if isinstance(c, dict):
+                    for v in c.values():
+                        cmd.append(v)
+                else:
+                    cmd.append(c)
+            worker["command"] = [{"artifact-reference": " ".join(cmd)}]
+        else:
+            worker["command"] = [" ".join(command)]
+    else:
+        worker["command"] = [
+            ["chmod", "+x", "run-task"],
+            command,
+        ]
diff --git a/taskcluster/gecko_taskgraph/transforms/job/spidermonkey.py b/taskcluster/gecko_taskgraph/transforms/job/spidermonkey.py
new file mode 100644
index 0000000000..91c7e93bd6
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/job/spidermonkey.py
@@ -0,0 +1,109 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+Support for running spidermonkey jobs via dedicated scripts
+"""
+
+
+from taskgraph.util.schema import Schema
+from voluptuous import Any, Optional, Required
+
+from gecko_taskgraph.transforms.job import configure_taskdesc_for_run, run_job_using
+from gecko_taskgraph.transforms.job.common import (
+    docker_worker_add_artifacts,
+    generic_worker_add_artifacts,
+)
+
+sm_run_schema = Schema(
+    {
+        Required("using"): Any(
+            "spidermonkey",
+            "spidermonkey-package",
+        ),
+        # SPIDERMONKEY_VARIANT and SPIDERMONKEY_PLATFORM
+        Required("spidermonkey-variant"): str,
+        Optional("spidermonkey-platform"): str,
+        # Base work directory used to set up the task.
+        Optional("workdir"): str,
+        Required("tooltool-downloads"): Any(
+            False,
+            "public",
+            "internal",
+        ),
+    }
+)
+
+
+@run_job_using("docker-worker", "spidermonkey", schema=sm_run_schema)
+@run_job_using("docker-worker", "spidermonkey-package", schema=sm_run_schema)
+def docker_worker_spidermonkey(config, job, taskdesc):
+    run = job["run"]
+
+    worker = taskdesc["worker"] = job["worker"]
+    worker.setdefault("artifacts", [])
+
+    docker_worker_add_artifacts(config, job, taskdesc)
+
+    env = worker.setdefault("env", {})
+    env.update(
+        {
+            "MOZHARNESS_DISABLE": "true",
+            "SPIDERMONKEY_VARIANT": run.pop("spidermonkey-variant"),
+            "MOZ_BUILD_DATE": config.params["moz_build_date"],
+            "MOZ_SCM_LEVEL": config.params["level"],
+        }
+    )
+    if "spidermonkey-platform" in run:
+        env["SPIDERMONKEY_PLATFORM"] = run.pop("spidermonkey-platform")
+
+    script = "build-sm.sh"
+    if run["using"] == "spidermonkey-package":
+        script = "build-sm-package.sh"
+
+    run["using"] = "run-task"
+    run["cwd"] = run["workdir"]
+    run["command"] = [f"./checkouts/gecko/taskcluster/scripts/builder/{script}"]
+
+    configure_taskdesc_for_run(config, job, taskdesc, worker["implementation"])
+
+
+@run_job_using("generic-worker", "spidermonkey", schema=sm_run_schema)
+def generic_worker_spidermonkey(config, job, taskdesc):
+    assert job["worker"]["os"] == "windows", "only supports windows right now"
+
+    run = job["run"]
+
+    worker = taskdesc["worker"] = job["worker"]
+
+    generic_worker_add_artifacts(config, job, taskdesc)
+
+    env = worker.setdefault("env", {})
+    env.update(
+        {
+            "MOZHARNESS_DISABLE": "true",
+            "SPIDERMONKEY_VARIANT": run.pop("spidermonkey-variant"),
+            "MOZ_BUILD_DATE": config.params["moz_build_date"],
+            "MOZ_SCM_LEVEL": config.params["level"],
+            "SCCACHE_DISABLE": "1",
+            "WORK": ".",  # Override the defaults in build scripts
+            "GECKO_PATH": "./src",  # with values suiteable for windows generic worker
+            "UPLOAD_DIR": "./public/build",
+        }
+    )
+    if "spidermonkey-platform" in run:
+        env["SPIDERMONKEY_PLATFORM"] = run.pop("spidermonkey-platform")
+
+    script = "build-sm.sh"
+    if run["using"] == "spidermonkey-package":
+        script = "build-sm-package.sh"
+        # Don't allow untested configurations yet
+        raise Exception("spidermonkey-package is not a supported configuration")
+
+    run["using"] = "run-task"
+    run["command"] = [
+        "c:\\mozilla-build\\msys2\\usr\\bin\\bash.exe "  # string concat
+        '"./src/taskcluster/scripts/builder/%s"' % script
+    ]
+
+    configure_taskdesc_for_run(config, job, taskdesc, worker["implementation"])
diff --git a/taskcluster/gecko_taskgraph/transforms/job/toolchain.py b/taskcluster/gecko_taskgraph/transforms/job/toolchain.py
new file mode 100644
index 0000000000..fb030019fc
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/job/toolchain.py
@@ -0,0 +1,257 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+Support for running toolchain-building jobs via dedicated scripts
+"""
+
+
+import os
+
+import taskgraph
+from mozbuild.shellutil import quote as shell_quote
+from taskgraph.util.schema import Schema, optionally_keyed_by, resolve_keyed_by
+from voluptuous import Any, Optional, Required
+
+from gecko_taskgraph import GECKO
+from gecko_taskgraph.transforms.job import configure_taskdesc_for_run, run_job_using
+from gecko_taskgraph.transforms.job.common import (
+    docker_worker_add_artifacts,
+    generic_worker_add_artifacts,
+)
+from gecko_taskgraph.util.attributes import RELEASE_PROJECTS
+from gecko_taskgraph.util.hash import hash_paths
+
+CACHE_TYPE = "toolchains.v3"
+
+toolchain_run_schema = Schema(
+    {
+        Required("using"): "toolchain-script",
+        # The script (in taskcluster/scripts/misc) to run.
+        # Python scripts are invoked with `mach python` so vendored libraries
+        # are available.
+        Required("script"): str,
+        # Arguments to pass to the script.
+        Optional("arguments"): [str],
+        # If not false, tooltool downloads will be enabled via relengAPIProxy
+        # for either just public files, or all files.  Not supported on Windows
+        Required("tooltool-downloads"): Any(
+            False,
+            "public",
+            "internal",
+        ),
+        # Sparse profile to give to checkout using `run-task`.  If given,
+        # Defaults to "toolchain-build". The value is relative to
+        # "sparse-profile-prefix", optionally defined below is the path,
+        # defaulting to "build/sparse-profiles".
+        # i.e. `build/sparse-profiles/toolchain-build`.
+        # If `None`, instructs `run-task` to not use a sparse profile at all.
+        Required("sparse-profile"): Any(str, None),
+        # The relative path to the sparse profile.
+        Optional("sparse-profile-prefix"): str,
+        # Paths/patterns pointing to files that influence the outcome of a
+        # toolchain build.
+        Optional("resources"): [str],
+        # Path to the artifact produced by the toolchain job
+        Required("toolchain-artifact"): str,
+        Optional(
+            "toolchain-alias",
+            description="An alias that can be used instead of the real toolchain job name in "
+            "fetch stanzas for jobs.",
+        ): optionally_keyed_by("project", Any(None, str, [str])),
+        Optional(
+            "toolchain-env",
+            description="Additional env variables to add to the worker when using this toolchain",
+        ): {str: object},
+        # Base work directory used to set up the task.
+        Optional("workdir"): str,
+    }
+)
+
+
+def get_digest_data(config, run, taskdesc):
+    files = list(run.pop("resources", []))
+    # The script
+    files.append("taskcluster/scripts/misc/{}".format(run["script"]))
+    # Tooltool manifest if any is defined:
+    tooltool_manifest = taskdesc["worker"]["env"].get("TOOLTOOL_MANIFEST")
+    if tooltool_manifest:
+        files.append(tooltool_manifest)
+
+    # Accumulate dependency hashes for index generation.
+    data = [hash_paths(GECKO, files)]
+
+    data.append(taskdesc["attributes"]["toolchain-artifact"])
+
+    # If the task uses an in-tree docker image, we want it to influence
+    # the index path as well. Ideally, the content of the docker image itself
+    # should have an influence, but at the moment, we can't get that
+    # information here. So use the docker image name as a proxy. Not a lot of
+    # changes to docker images actually have an impact on the resulting
+    # toolchain artifact, so we'll just rely on such important changes to be
+    # accompanied with a docker image name change.
+    image = taskdesc["worker"].get("docker-image", {}).get("in-tree")
+    if image:
+        data.append(image)
+
+    # Likewise script arguments should influence the index.
+    args = run.get("arguments")
+    if args:
+        data.extend(args)
+
+    if taskdesc["attributes"].get("rebuild-on-release"):
+        # Add whether this is a release branch or not
+        data.append(str(config.params["project"] in RELEASE_PROJECTS))
+    return data
+
+
+def common_toolchain(config, job, taskdesc, is_docker):
+    run = job["run"]
+
+    worker = taskdesc["worker"] = job["worker"]
+    worker["chain-of-trust"] = True
+
+    if is_docker:
+        # If the task doesn't have a docker-image, set a default
+        worker.setdefault("docker-image", {"in-tree": "deb11-toolchain-build"})
+
+    if job["worker"]["os"] == "windows":
+        # There were no caches on generic-worker before bug 1519472, and they cause
+        # all sorts of problems with Windows toolchain tasks, disable them until
+        # tasks are ready.
+        run["use-caches"] = False
+
+    env = worker.setdefault("env", {})
+    env.update(
+        {
+            "MOZ_BUILD_DATE": config.params["moz_build_date"],
+            "MOZ_SCM_LEVEL": config.params["level"],
+            "TOOLCHAIN_ARTIFACT": run["toolchain-artifact"],
+        }
+    )
+
+    if is_docker:
+        # Toolchain checkouts don't live under {workdir}/checkouts
+        workspace = "{workdir}/workspace/build".format(**run)
+        env["GECKO_PATH"] = f"{workspace}/src"
+
+    attributes = taskdesc.setdefault("attributes", {})
+    attributes["toolchain-artifact"] = run.pop("toolchain-artifact")
+    toolchain_artifact = attributes["toolchain-artifact"]
+    if not toolchain_artifact.startswith("public/build/"):
+        if "artifact_prefix" in attributes:
+            raise Exception(
+                "Toolchain {} has an artifact_prefix attribute. That is not"
+                " allowed on toolchain tasks.".format(taskdesc["label"])
+            )
+        attributes["artifact_prefix"] = os.path.dirname(toolchain_artifact)
+
+    resolve_keyed_by(
+        run,
+        "toolchain-alias",
+        item_name=taskdesc["label"],
+        project=config.params["project"],
+    )
+    alias = run.pop("toolchain-alias", None)
+    if alias:
+        attributes["toolchain-alias"] = alias
+    if "toolchain-env" in run:
+        attributes["toolchain-env"] = run.pop("toolchain-env")
+
+    # Allow the job to specify where artifacts come from, but add
+    # public/build if it's not there already.
+    artifacts = worker.setdefault("artifacts", [])
+    if not artifacts:
+        if is_docker:
+            docker_worker_add_artifacts(config, job, taskdesc)
+        else:
+            generic_worker_add_artifacts(config, job, taskdesc)
+
+    digest_data = get_digest_data(config, run, taskdesc)
+
+    if job.get("attributes", {}).get("cached_task") is not False and not taskgraph.fast:
+        name = taskdesc["label"].replace(f"{config.kind}-", "", 1)
+        taskdesc["cache"] = {
+            "type": CACHE_TYPE,
+            "name": name,
+            "digest-data": digest_data,
+        }
+
+    # Toolchains that are used for local development need to be built on a
+    # level-3 branch to be installable via `mach bootstrap`.
+    local_toolchain = taskdesc["attributes"].get("local-toolchain")
+    if local_toolchain:
+        if taskdesc.get("run-on-projects"):
+            raise Exception(
+                "Toolchain {} used for local developement must not have"
+                " run-on-projects set".format(taskdesc["label"])
+            )
+        taskdesc["run-on-projects"] = ["integration", "release"]
+
+    script = run.pop("script")
+    arguments = run.pop("arguments", [])
+    if local_toolchain and not attributes["toolchain-artifact"].startswith("public/"):
+        # Local toolchains with private artifacts are expected to have a script that
+        # fill a directory given as a final command line argument. That script, and the
+        # arguments provided, are used by the build system bootstrap code, and for the
+        # corresponding CI tasks, the command is wrapped with a script that creates an
+        # artifact based on that filled directory.
+        # We prefer automatic wrapping rather than manual wrapping in the yaml because
+        # it makes the index independent of the wrapper script, which is irrelevant.
+        # Also, an attribute is added for the bootstrap code to be able to easily parse
+        # the command.
+        attributes["toolchain-command"] = {
+            "script": script,
+            "arguments": list(arguments),
+        }
+        arguments.insert(0, script)
+        script = "private_local_toolchain.sh"
+
+    run["using"] = "run-task"
+    if is_docker:
+        gecko_path = "workspace/build/src"
+    elif job["worker"]["os"] == "windows":
+        gecko_path = "%GECKO_PATH%"
+    else:
+        gecko_path = "$GECKO_PATH"
+
+    if is_docker:
+        run["cwd"] = run["workdir"]
+    run["command"] = [
+        "{}/taskcluster/scripts/misc/{}".format(gecko_path, script)
+    ] + arguments
+    if not is_docker:
+        # Don't quote the first item in the command because it purposely contains
+        # an environment variable that is not meant to be quoted.
+        if len(run["command"]) > 1:
+            run["command"] = run["command"][0] + " " + shell_quote(*run["command"][1:])
+        else:
+            run["command"] = run["command"][0]
+
+    configure_taskdesc_for_run(config, job, taskdesc, worker["implementation"])
+
+
+toolchain_defaults = {
+    "tooltool-downloads": False,
+    "sparse-profile": "toolchain-build",
+}
+
+
+@run_job_using(
+    "docker-worker",
+    "toolchain-script",
+    schema=toolchain_run_schema,
+    defaults=toolchain_defaults,
+)
+def docker_worker_toolchain(config, job, taskdesc):
+    common_toolchain(config, job, taskdesc, is_docker=True)
+
+
+@run_job_using(
+    "generic-worker",
+    "toolchain-script",
+    schema=toolchain_run_schema,
+    defaults=toolchain_defaults,
+)
+def generic_worker_toolchain(config, job, taskdesc):
+    common_toolchain(config, job, taskdesc, is_docker=False)
diff --git a/taskcluster/gecko_taskgraph/transforms/l10n.py b/taskcluster/gecko_taskgraph/transforms/l10n.py
new file mode 100644
index 0000000000..e36c70246b
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/l10n.py
@@ -0,0 +1,416 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+Do transforms specific to l10n kind
+"""
+
+
+import json
+
+from mozbuild.chunkify import chunkify
+from taskgraph.transforms.base import TransformSequence
+from taskgraph.util.schema import (
+    optionally_keyed_by,
+    resolve_keyed_by,
+    taskref_or_string,
+)
+from taskgraph.util.taskcluster import get_artifact_prefix
+from taskgraph.util.treeherder import add_suffix
+from voluptuous import Any, Optional, Required
+
+from gecko_taskgraph.loader.multi_dep import schema
+from gecko_taskgraph.transforms.job import job_description_schema
+from gecko_taskgraph.transforms.task import task_description_schema
+from gecko_taskgraph.util.attributes import (
+    copy_attributes_from_dependent_job,
+    task_name,
+)
+from gecko_taskgraph.util.copy_task import copy_task
+
+
+def _by_platform(arg):
+    return optionally_keyed_by("build-platform", arg)
+
+
+l10n_description_schema = schema.extend(
+    {
+        # Name for this job, inferred from the dependent job before validation
+        Required("name"): str,
+        # build-platform, inferred from dependent job before validation
+        Required("build-platform"): str,
+        # max run time of the task
+        Required("run-time"): _by_platform(int),
+        # Locales not to repack for
+        Required("ignore-locales"): _by_platform([str]),
+        # All l10n jobs use mozharness
+        Required("mozharness"): {
+            # Script to invoke for mozharness
+            Required("script"): _by_platform(str),
+            # Config files passed to the mozharness script
+            Required("config"): _by_platform([str]),
+            # Additional paths to look for mozharness configs in. These should be
+            # relative to the base of the source checkout
+            Optional("config-paths"): [str],
+            # Options to pass to the mozharness script
+            Optional("options"): _by_platform([str]),
+            # Action commands to provide to mozharness script
+            Required("actions"): _by_platform([str]),
+            # if true, perform a checkout of a comm-central based branch inside the
+            # gecko checkout
+            Optional("comm-checkout"): bool,
+        },
+        # Items for the taskcluster index
+        Optional("index"): {
+            # Product to identify as in the taskcluster index
+            Required("product"): _by_platform(str),
+            # Job name to identify as in the taskcluster index
+            Required("job-name"): _by_platform(str),
+            # Type of index
+            Optional("type"): _by_platform(str),
+        },
+        # Description of the localized task
+        Required("description"): _by_platform(str),
+        Optional("run-on-projects"): job_description_schema["run-on-projects"],
+        # worker-type to utilize
+        Required("worker-type"): _by_platform(str),
+        # File which contains the used locales
+        Required("locales-file"): _by_platform(str),
+        # Tooltool visibility required for task.
+        Required("tooltool"): _by_platform(Any("internal", "public")),
+        # Docker image required for task.  We accept only in-tree images
+        # -- generally desktop-build or android-build -- for now.
+        Optional("docker-image"): _by_platform(
+            # an in-tree generated docker image (from `taskcluster/docker/<name>`)
+            {"in-tree": str},
+        ),
+        Optional("fetches"): {
+            str: _by_platform([str]),
+        },
+        # The set of secret names to which the task has access; these are prefixed
+        # with `project/releng/gecko/{treeherder.kind}/level-{level}/`.  Setting
+        # this will enable any worker features required and set the task's scopes
+        # appropriately.  `true` here means ['*'], all secrets.  Not supported on
+        # Windows
+        Optional("secrets"): _by_platform(Any(bool, [str])),
+        # Information for treeherder
+        Required("treeherder"): {
+            # Platform to display the task on in treeherder
+            Required("platform"): _by_platform(str),
+            # Symbol to use
+            Required("symbol"): str,
+            # Tier this task is
+            Required("tier"): _by_platform(int),
+        },
+        # Extra environment values to pass to the worker
+        Optional("env"): _by_platform({str: taskref_or_string}),
+        # Max number locales per chunk
+        Optional("locales-per-chunk"): _by_platform(int),
+        # Task deps to chain this task with, added in transforms from primary-dependency
+        # if this is a shippable-style build
+        Optional("dependencies"): {str: str},
+        # Run the task when the listed files change (if present).
+        Optional("when"): {"files-changed": [str]},
+        # passed through directly to the job description
+        Optional("attributes"): job_description_schema["attributes"],
+        Optional("extra"): job_description_schema["extra"],
+        # Shipping product and phase
+        Optional("shipping-product"): task_description_schema["shipping-product"],
+        Optional("shipping-phase"): task_description_schema["shipping-phase"],
+    }
+)
+
+transforms = TransformSequence()
+
+
+def parse_locales_file(locales_file, platform=None):
+    """Parse the passed locales file for a list of locales."""
+    locales = []
+
+    with open(locales_file, mode="r") as f:
+        if locales_file.endswith("json"):
+            all_locales = json.load(f)
+            # XXX Only single locales are fetched
+            locales = {
+                locale: data["revision"]
+                for locale, data in all_locales.items()
+                if platform is None or platform in data["platforms"]
+            }
+        else:
+            all_locales = f.read().split()
+            # 'default' is the hg revision at the top of hg repo, in this context
+            locales = {locale: "default" for locale in all_locales}
+    return locales
+
+
+def _remove_locales(locales, to_remove=None):
+    # ja-JP-mac is a mac-only locale, but there are no mac builds being repacked,
+    # so just omit it unconditionally
+    return {
+        locale: revision
+        for locale, revision in locales.items()
+        if locale not in to_remove
+    }
+
+
+@transforms.add
+def setup_name(config, jobs):
+    for job in jobs:
+        dep = job["primary-dependency"]
+        # Set the name to the same as the dep task, without kind name.
+        # Label will get set automatically with this kinds name.
+        job["name"] = job.get("name", task_name(dep))
+        yield job
+
+
+@transforms.add
+def copy_in_useful_magic(config, jobs):
+    for job in jobs:
+        dep = job["primary-dependency"]
+        attributes = copy_attributes_from_dependent_job(dep)
+        attributes.update(job.get("attributes", {}))
+        # build-platform is needed on `job` for by-build-platform
+        job["build-platform"] = attributes.get("build_platform")
+        job["attributes"] = attributes
+        yield job
+
+
+transforms.add_validate(l10n_description_schema)
+
+
+@transforms.add
+def setup_shippable_dependency(config, jobs):
+    """Sets up a task dependency to the signing job this relates to"""
+    for job in jobs:
+        job["dependencies"] = {"build": job["dependent-tasks"]["build"].label}
+        if job["attributes"]["build_platform"].startswith("win") or job["attributes"][
+            "build_platform"
+        ].startswith("linux"):
+            job["dependencies"].update(
+                {
+                    "build-signing": job["dependent-tasks"]["build-signing"].label,
+                }
+            )
+        if job["attributes"]["build_platform"].startswith("macosx"):
+            job["dependencies"].update(
+                {"repackage": job["dependent-tasks"]["repackage"].label}
+            )
+        yield job
+
+
+@transforms.add
+def handle_keyed_by(config, jobs):
+    """Resolve fields that can be keyed by platform, etc."""
+    fields = [
+        "locales-file",
+        "locales-per-chunk",
+        "worker-type",
+        "description",
+        "run-time",
+        "docker-image",
+        "secrets",
+        "fetches.toolchain",
+        "fetches.fetch",
+        "tooltool",
+        "env",
+        "ignore-locales",
+        "mozharness.config",
+        "mozharness.options",
+        "mozharness.actions",
+        "mozharness.script",
+        "treeherder.tier",
+        "treeherder.platform",
+        "index.type",
+        "index.product",
+        "index.job-name",
+        "when.files-changed",
+    ]
+    for job in jobs:
+        job = copy_task(job)  # don't overwrite dict values here
+        for field in fields:
+            resolve_keyed_by(item=job, field=field, item_name=job["name"])
+        yield job
+
+
+@transforms.add
+def handle_artifact_prefix(config, jobs):
+    """Resolve ``artifact_prefix`` in env vars"""
+    for job in jobs:
+        artifact_prefix = get_artifact_prefix(job)
+        for k1, v1 in job.get("env", {}).items():
+            if isinstance(v1, str):
+                job["env"][k1] = v1.format(artifact_prefix=artifact_prefix)
+            elif isinstance(v1, dict):
+                for k2, v2 in v1.items():
+                    job["env"][k1][k2] = v2.format(artifact_prefix=artifact_prefix)
+        yield job
+
+
+@transforms.add
+def all_locales_attribute(config, jobs):
+    for job in jobs:
+        locales_platform = job["attributes"]["build_platform"].replace("-shippable", "")
+        locales_platform = locales_platform.replace("-pgo", "")
+        locales_with_changesets = parse_locales_file(
+            job["locales-file"], platform=locales_platform
+        )
+        locales_with_changesets = _remove_locales(
+            locales_with_changesets, to_remove=job["ignore-locales"]
+        )
+
+        locales = sorted(locales_with_changesets.keys())
+        attributes = job.setdefault("attributes", {})
+        attributes["all_locales"] = locales
+        attributes["all_locales_with_changesets"] = locales_with_changesets
+        if job.get("shipping-product"):
+            attributes["shipping_product"] = job["shipping-product"]
+        yield job
+
+
+@transforms.add
+def chunk_locales(config, jobs):
+    """Utilizes chunking for l10n stuff"""
+    for job in jobs:
+        locales_per_chunk = job.get("locales-per-chunk")
+        locales_with_changesets = job["attributes"]["all_locales_with_changesets"]
+        if locales_per_chunk:
+            chunks, remainder = divmod(len(locales_with_changesets), locales_per_chunk)
+            if remainder:
+                chunks = int(chunks + 1)
+            for this_chunk in range(1, chunks + 1):
+                chunked = copy_task(job)
+                chunked["name"] = chunked["name"].replace("/", f"-{this_chunk}/", 1)
+                chunked["mozharness"]["options"] = chunked["mozharness"].get(
+                    "options", []
+                )
+                # chunkify doesn't work with dicts
+                locales_with_changesets_as_list = sorted(
+                    locales_with_changesets.items()
+                )
+                chunked_locales = chunkify(
+                    locales_with_changesets_as_list, this_chunk, chunks
+                )
+                chunked["mozharness"]["options"].extend(
+                    [
+                        f"locale={locale}:{changeset}"
+                        for locale, changeset in chunked_locales
+                    ]
+                )
+                chunked["attributes"]["l10n_chunk"] = str(this_chunk)
+                # strip revision
+                chunked["attributes"]["chunk_locales"] = [
+                    locale for locale, _ in chunked_locales
+                ]
+
+                # add the chunk number to the TH symbol
+                chunked["treeherder"]["symbol"] = add_suffix(
+                    chunked["treeherder"]["symbol"], this_chunk
+                )
+                yield chunked
+        else:
+            job["mozharness"]["options"] = job["mozharness"].get("options", [])
+            job["mozharness"]["options"].extend(
+                [
+                    f"locale={locale}:{changeset}"
+                    for locale, changeset in sorted(locales_with_changesets.items())
+                ]
+            )
+            yield job
+
+
+transforms.add_validate(l10n_description_schema)
+
+
+@transforms.add
+def stub_installer(config, jobs):
+    for job in jobs:
+        job.setdefault("attributes", {})
+        job.setdefault("env", {})
+        if job["attributes"].get("stub-installer"):
+            job["env"].update({"USE_STUB_INSTALLER": "1"})
+        yield job
+
+
+@transforms.add
+def set_extra_config(config, jobs):
+    for job in jobs:
+        job["mozharness"].setdefault("extra-config", {})["branch"] = config.params[
+            "project"
+        ]
+        if "update-channel" in job["attributes"]:
+            job["mozharness"]["extra-config"]["update_channel"] = job["attributes"][
+                "update-channel"
+            ]
+        yield job
+
+
+@transforms.add
+def make_job_description(config, jobs):
+    for job in jobs:
+        job["mozharness"].update(
+            {
+                "using": "mozharness",
+                "job-script": "taskcluster/scripts/builder/build-l10n.sh",
+                "secrets": job.get("secrets", False),
+            }
+        )
+        job_description = {
+            "name": job["name"],
+            "worker-type": job["worker-type"],
+            "description": job["description"],
+            "run": job["mozharness"],
+            "attributes": job["attributes"],
+            "treeherder": {
+                "kind": "build",
+                "tier": job["treeherder"]["tier"],
+                "symbol": job["treeherder"]["symbol"],
+                "platform": job["treeherder"]["platform"],
+            },
+            "run-on-projects": job.get("run-on-projects")
+            if job.get("run-on-projects")
+            else [],
+        }
+        if job.get("extra"):
+            job_description["extra"] = job["extra"]
+
+        job_description["run"]["tooltool-downloads"] = job["tooltool"]
+
+        job_description["worker"] = {
+            "max-run-time": job["run-time"],
+            "chain-of-trust": True,
+        }
+        if job["worker-type"] == "b-win2012":
+            job_description["worker"]["os"] = "windows"
+            job_description["run"]["use-simple-package"] = False
+            job_description["run"]["use-magic-mh-args"] = False
+
+        if job.get("docker-image"):
+            job_description["worker"]["docker-image"] = job["docker-image"]
+
+        if job.get("fetches"):
+            job_description["fetches"] = job["fetches"]
+
+        if job.get("index"):
+            job_description["index"] = {
+                "product": job["index"]["product"],
+                "job-name": job["index"]["job-name"],
+                "type": job["index"].get("type", "generic"),
+            }
+
+        if job.get("dependencies"):
+            job_description["dependencies"] = job["dependencies"]
+        if job.get("env"):
+            job_description["worker"]["env"] = job["env"]
+        if job.get("when", {}).get("files-changed"):
+            job_description.setdefault("when", {})
+            job_description["when"]["files-changed"] = [job["locales-file"]] + job[
+                "when"
+            ]["files-changed"]
+
+        if "shipping-phase" in job:
+            job_description["shipping-phase"] = job["shipping-phase"]
+
+        if "shipping-product" in job:
+            job_description["shipping-product"] = job["shipping-product"]
+
+        yield job_description
diff --git a/taskcluster/gecko_taskgraph/transforms/mac_dummy.py b/taskcluster/gecko_taskgraph/transforms/mac_dummy.py
new file mode 100644
index 0000000000..f134ee2765
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/mac_dummy.py
@@ -0,0 +1,40 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+Add dependencies to dummy macosx64 tasks.
+"""
+
+from taskgraph.transforms.base import TransformSequence
+
+transforms = TransformSequence()
+
+
+@transforms.add
+def add_dependencies(config, jobs):
+    for job in jobs:
+        dependencies = {}
+
+        platform = job.get("attributes", {}).get("build_platform")
+        if not platform:
+            continue
+        arm = platform.replace("macosx64", "macosx64-aarch64")
+        intel = platform.replace("macosx64", "macosx64-x64")
+        for dep_task in config.kind_dependencies_tasks.values():
+            # Weed out unwanted tasks.
+            if dep_task.attributes.get("build_platform"):
+                if dep_task.attributes["build_platform"] not in (platform, arm, intel):
+                    continue
+            # Add matching tasks to deps
+            dependencies[dep_task.label] = dep_task.label
+            # Pick one task to copy run-on-projects from
+            if (
+                dep_task.kind == "build"
+                and dep_task.attributes["build_platform"] == platform
+            ):
+                job["run-on-projects"] = dep_task.attributes.get("run_on_projects")
+
+        job.setdefault("dependencies", {}).update(dependencies)
+        job["if-dependencies"] = list(dependencies)
+
+        yield job
diff --git a/taskcluster/gecko_taskgraph/transforms/mac_notarization.py b/taskcluster/gecko_taskgraph/transforms/mac_notarization.py
new file mode 100644
index 0000000000..5591022e1b
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/mac_notarization.py
@@ -0,0 +1,19 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+Transform mac notarization tasks
+"""
+
+from taskgraph.transforms.base import TransformSequence
+
+transforms = TransformSequence()
+
+
+@transforms.add
+def only_level_3_notarization(config, jobs):
+    """Filter out any notarization jobs that are not level 3"""
+    for job in jobs:
+        if "notarization" in config.kind and int(config.params["level"]) != 3:
+            continue
+        yield job
diff --git a/taskcluster/gecko_taskgraph/transforms/mar_signing.py b/taskcluster/gecko_taskgraph/transforms/mar_signing.py
new file mode 100644
index 0000000000..d923721f45
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/mar_signing.py
@@ -0,0 +1,140 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+Transform the {partials,mar}-signing task into an actual task description.
+"""
+
+import logging
+import os
+
+from taskgraph.transforms.base import TransformSequence
+from taskgraph.util.taskcluster import get_artifact_prefix
+from taskgraph.util.treeherder import inherit_treeherder_from_dep, join_symbol
+
+from gecko_taskgraph.util.attributes import (
+    copy_attributes_from_dependent_job,
+    sorted_unique_list,
+)
+from gecko_taskgraph.util.partials import get_partials_artifacts_from_params
+from gecko_taskgraph.util.scriptworker import get_signing_cert_scope_per_platform
+
+logger = logging.getLogger(__name__)
+
+SIGNING_FORMATS = {
+    "mar-signing-autograph-stage": {
+        "target.complete.mar": ["autograph_stage_mar384"],
+    },
+    "default": {
+        "target.complete.mar": ["autograph_hash_only_mar384"],
+    },
+}
+
+transforms = TransformSequence()
+
+
+def generate_partials_artifacts(job, release_history, platform, locale=None):
+    artifact_prefix = get_artifact_prefix(job)
+    if locale:
+        artifact_prefix = f"{artifact_prefix}/{locale}"
+    else:
+        locale = "en-US"
+
+    artifacts = get_partials_artifacts_from_params(release_history, platform, locale)
+
+    upstream_artifacts = [
+        {
+            "taskId": {"task-reference": "<partials>"},
+            "taskType": "partials",
+            "paths": [f"{artifact_prefix}/{path}" for path, version in artifacts],
+            "formats": ["autograph_hash_only_mar384"],
+        }
+    ]
+
+    return upstream_artifacts
+
+
+def generate_complete_artifacts(job, kind):
+    upstream_artifacts = []
+    if kind not in SIGNING_FORMATS:
+        kind = "default"
+    for artifact in job.attributes["release_artifacts"]:
+        basename = os.path.basename(artifact)
+        if basename in SIGNING_FORMATS[kind]:
+            upstream_artifacts.append(
+                {
+                    "taskId": {"task-reference": f"<{job.kind}>"},
+                    "taskType": "build",
+                    "paths": [artifact],
+                    "formats": SIGNING_FORMATS[kind][basename],
+                }
+            )
+
+    return upstream_artifacts
+
+
+@transforms.add
+def make_task_description(config, jobs):
+    for job in jobs:
+        dep_job = job["primary-dependency"]
+        locale = dep_job.attributes.get("locale")
+
+        treeherder = inherit_treeherder_from_dep(job, dep_job)
+        treeherder.setdefault(
+            "symbol", join_symbol(job.get("treeherder-group", "ms"), locale or "N")
+        )
+
+        label = job.get("label", f"{config.kind}-{dep_job.label}")
+
+        dependencies = {dep_job.kind: dep_job.label}
+        signing_dependencies = dep_job.dependencies
+        # This is so we get the build task etc in our dependencies to
+        # have better beetmover support.
+        dependencies.update(signing_dependencies)
+
+        attributes = copy_attributes_from_dependent_job(dep_job)
+        attributes["required_signoffs"] = sorted_unique_list(
+            attributes.get("required_signoffs", []), job.pop("required_signoffs")
+        )
+        attributes["shipping_phase"] = job["shipping-phase"]
+        if locale:
+            attributes["locale"] = locale
+
+        build_platform = attributes.get("build_platform")
+        if config.kind == "partials-signing":
+            upstream_artifacts = generate_partials_artifacts(
+                dep_job, config.params["release_history"], build_platform, locale
+            )
+        else:
+            upstream_artifacts = generate_complete_artifacts(dep_job, config.kind)
+
+        is_shippable = job.get(
+            "shippable", dep_job.attributes.get("shippable")  # First check current job
+        )  # Then dep job for 'shippable'
+        signing_cert_scope = get_signing_cert_scope_per_platform(
+            build_platform, is_shippable, config
+        )
+
+        scopes = [signing_cert_scope]
+
+        task = {
+            "label": label,
+            "description": "{} {}".format(
+                dep_job.description, job["description-suffix"]
+            ),
+            "worker-type": job.get("worker-type", "linux-signing"),
+            "worker": {
+                "implementation": "scriptworker-signing",
+                "upstream-artifacts": upstream_artifacts,
+                "max-run-time": 3600,
+            },
+            "dependencies": dependencies,
+            "attributes": attributes,
+            "scopes": scopes,
+            "run-on-projects": job.get(
+                "run-on-projects", dep_job.attributes.get("run_on_projects")
+            ),
+            "treeherder": treeherder,
+        }
+
+        yield task
diff --git a/taskcluster/gecko_taskgraph/transforms/maybe_release.py b/taskcluster/gecko_taskgraph/transforms/maybe_release.py
new file mode 100644
index 0000000000..08a066001a
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/maybe_release.py
@@ -0,0 +1,23 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+from taskgraph.transforms.base import TransformSequence
+from taskgraph.util.schema import resolve_keyed_by
+
+from gecko_taskgraph.util.attributes import release_level
+
+transforms = TransformSequence()
+
+
+@transforms.add
+def make_task_description(config, jobs):
+    for job in jobs:
+        for key in ["worker-type", "scopes"]:
+            resolve_keyed_by(
+                job,
+                key,
+                item_name=job["name"],
+                **{"release-level": release_level(config.params["project"])}
+            )
+        yield job
diff --git a/taskcluster/gecko_taskgraph/transforms/merge_automation.py b/taskcluster/gecko_taskgraph/transforms/merge_automation.py
new file mode 100644
index 0000000000..ca5f3b6bde
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/merge_automation.py
@@ -0,0 +1,81 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+Transform the update generation task into an actual task description.
+"""
+
+from taskgraph.transforms.base import TransformSequence
+from taskgraph.util.schema import resolve_keyed_by
+
+transforms = TransformSequence()
+
+
+@transforms.add
+def handle_keyed_by(config, tasks):
+    """Resolve fields that can be keyed by platform, etc."""
+    if "merge_config" not in config.params:
+        return
+    merge_config = config.params["merge_config"]
+    fields = [
+        "worker.push",
+        "worker-type",
+        "worker.l10n-bump-info",
+        "worker.source-repo",
+    ]
+    for task in tasks:
+        for field in fields:
+            resolve_keyed_by(
+                task,
+                field,
+                item_name=task["name"],
+                **{
+                    "project": config.params["project"],
+                    "release-type": config.params["release_type"],
+                    "behavior": merge_config["behavior"],
+                }
+            )
+        yield task
+
+
+@transforms.add
+def update_labels(config, tasks):
+    for task in tasks:
+        merge_config = config.params["merge_config"]
+        task["label"] = "merge-{}".format(merge_config["behavior"])
+        treeherder = task.get("treeherder", {})
+        treeherder["symbol"] = "Rel({})".format(merge_config["behavior"])
+        task["treeherder"] = treeherder
+        yield task
+
+
+@transforms.add
+def add_payload_config(config, tasks):
+    for task in tasks:
+        if "merge_config" not in config.params:
+            break
+        merge_config = config.params["merge_config"]
+        worker = task["worker"]
+        worker["merge-info"] = config.graph_config["merge-automation"]["behaviors"][
+            merge_config["behavior"]
+        ]
+
+        if "l10n-bump-info" in worker and worker["l10n-bump-info"] is None:
+            del worker["l10n-bump-info"]
+
+        # Override defaults, useful for testing.
+        for field in [
+            "from-repo",
+            "from-branch",
+            "to-repo",
+            "to-branch",
+            "fetch-version-from",
+        ]:
+            if merge_config.get(field):
+                worker["merge-info"][field] = merge_config[field]
+
+        worker["force-dry-run"] = merge_config["force-dry-run"]
+        worker["ssh-user"] = merge_config.get("ssh-user-alias", "merge_user")
+        if merge_config.get("push"):
+            worker["push"] = merge_config["push"]
+        yield task
diff --git a/taskcluster/gecko_taskgraph/transforms/name_sanity.py b/taskcluster/gecko_taskgraph/transforms/name_sanity.py
new file mode 100644
index 0000000000..856f4f82be
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/name_sanity.py
@@ -0,0 +1,45 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+Generate labels for tasks without names, consistently.
+Uses attributes from `primary-dependency`.
+"""
+
+from taskgraph.transforms.base import TransformSequence
+
+transforms = TransformSequence()
+
+
+@transforms.add
+def make_label(config, jobs):
+    """Generate a sane label for a new task constructed from a dependency
+    Using attributes from the dependent job and the current task kind"""
+    for job in jobs:
+        dep_job = job["primary-dependency"]
+        attr = dep_job.attributes.get
+
+        if attr("locale", job.get("locale")):
+            template = "{kind}-{locale}-{build_platform}/{build_type}"
+        elif attr("l10n_chunk"):
+            template = "{kind}-{build_platform}-{l10n_chunk}/{build_type}"
+        elif config.kind.startswith("release-eme-free") or config.kind.startswith(
+            "release-partner-repack"
+        ):
+            suffix = job.get("extra", {}).get("repack_suffix", None) or job.get(
+                "extra", {}
+            ).get("repack_id", None)
+            template = "{kind}-{build_platform}"
+            if suffix:
+                template += "-{}".format(suffix.replace("/", "-"))
+        else:
+            template = "{kind}-{build_platform}/{build_type}"
+        job["label"] = template.format(
+            kind=config.kind,
+            build_platform=attr("build_platform"),
+            build_type=attr("build_type"),
+            locale=attr("locale", job.get("locale", "")),  # Locale can be absent
+            l10n_chunk=attr("l10n_chunk", ""),  # Can be empty
+        )
+
+        yield job
diff --git a/taskcluster/gecko_taskgraph/transforms/openh264.py b/taskcluster/gecko_taskgraph/transforms/openh264.py
new file mode 100644
index 0000000000..f41215d20b
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/openh264.py
@@ -0,0 +1,26 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+This transform is used to help populate mozharness options for openh264 jobs
+"""
+
+from taskgraph.transforms.base import TransformSequence
+
+transforms = TransformSequence()
+
+
+@transforms.add
+def set_mh_options(config, jobs):
+    """
+    This transform sets the 'openh264_rev' attribute.
+    """
+    for job in jobs:
+        repo = job.pop("repo")
+        rev = job.pop("revision")
+        attributes = job.setdefault("attributes", {})
+        attributes["openh264_rev"] = rev
+        run = job.setdefault("run", {})
+        options = run.setdefault("options", [])
+        options.extend([f"repo={repo}", f"rev={rev}"])
+        yield job
diff --git a/taskcluster/gecko_taskgraph/transforms/openh264_signing.py b/taskcluster/gecko_taskgraph/transforms/openh264_signing.py
new file mode 100644
index 0000000000..dfffc7cc17
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/openh264_signing.py
@@ -0,0 +1,109 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+Transform the repackage signing task into an actual task description.
+"""
+
+from taskgraph.transforms.base import TransformSequence
+from taskgraph.util.treeherder import inherit_treeherder_from_dep
+from voluptuous import Optional
+
+from gecko_taskgraph.loader.single_dep import schema
+from gecko_taskgraph.transforms.task import task_description_schema
+from gecko_taskgraph.util.attributes import copy_attributes_from_dependent_job
+from gecko_taskgraph.util.scriptworker import get_signing_cert_scope_per_platform
+
+transforms = TransformSequence()
+
+signing_description_schema = schema.extend(
+    {
+        Optional("label"): str,
+        Optional("extra"): object,
+        Optional("shipping-product"): task_description_schema["shipping-product"],
+        Optional("shipping-phase"): task_description_schema["shipping-phase"],
+    }
+)
+
+transforms.add_validate(signing_description_schema)
+
+
+@transforms.add
+def make_signing_description(config, jobs):
+    for job in jobs:
+        dep_job = job["primary-dependency"]
+        attributes = dep_job.attributes
+        build_platform = dep_job.attributes.get("build_platform")
+        is_nightly = True  # cert_scope_per_platform uses this to choose the right cert
+
+        description = (
+            "Signing of OpenH264 Binaries for '"
+            "{build_platform}/{build_type}'".format(
+                build_platform=attributes.get("build_platform"),
+                build_type=attributes.get("build_type"),
+            )
+        )
+
+        # we have a genuine repackage job as our parent
+        dependencies = {"openh264": dep_job.label}
+
+        my_attributes = copy_attributes_from_dependent_job(dep_job)
+
+        signing_cert_scope = get_signing_cert_scope_per_platform(
+            build_platform, is_nightly, config
+        )
+
+        scopes = [signing_cert_scope]
+        worker_type = "linux-signing"
+        worker = {
+            "implementation": "scriptworker-signing",
+            "max-run-time": 3600,
+        }
+        rev = attributes["openh264_rev"]
+        upstream_artifact = {
+            "taskId": {"task-reference": "<openh264>"},
+            "taskType": "build",
+        }
+
+        if "win" in build_platform:
+            # job['primary-dependency'].task['payload']['command']
+            upstream_artifact["formats"] = ["autograph_authenticode_sha2"]
+        elif "mac" in build_platform:
+            upstream_artifact["formats"] = ["mac_single_file"]
+            upstream_artifact["singleFileGlobs"] = ["libgmpopenh264.dylib"]
+            worker_type = "mac-signing"
+            worker["mac-behavior"] = "mac_notarize_single_file"
+        else:
+            upstream_artifact["formats"] = ["autograph_gpg"]
+
+        upstream_artifact["paths"] = [
+            f"private/openh264/openh264-{build_platform}-{rev}.zip",
+        ]
+        worker["upstream-artifacts"] = [upstream_artifact]
+
+        treeherder = inherit_treeherder_from_dep(job, dep_job)
+        treeherder.setdefault(
+            "symbol",
+            _generate_treeherder_symbol(
+                dep_job.task.get("extra", {}).get("treeherder", {}).get("symbol")
+            ),
+        )
+
+        task = {
+            "label": job["label"],
+            "description": description,
+            "worker-type": worker_type,
+            "worker": worker,
+            "scopes": scopes,
+            "dependencies": dependencies,
+            "attributes": my_attributes,
+            "run-on-projects": dep_job.attributes.get("run_on_projects"),
+            "treeherder": treeherder,
+        }
+
+        yield task
+
+
+def _generate_treeherder_symbol(build_symbol):
+    symbol = build_symbol + "s"
+    return symbol
diff --git a/taskcluster/gecko_taskgraph/transforms/partials.py b/taskcluster/gecko_taskgraph/transforms/partials.py
new file mode 100644
index 0000000000..267739cfc3
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/partials.py
@@ -0,0 +1,172 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+Transform the partials task into an actual task description.
+"""
+
+import logging
+
+from taskgraph.transforms.base import TransformSequence
+from taskgraph.util.taskcluster import get_artifact_prefix
+from taskgraph.util.treeherder import inherit_treeherder_from_dep
+
+from gecko_taskgraph.util.attributes import (
+    copy_attributes_from_dependent_job,
+    release_level,
+)
+from gecko_taskgraph.util.partials import get_builds
+from gecko_taskgraph.util.platforms import architecture
+
+logger = logging.getLogger(__name__)
+
+transforms = TransformSequence()
+
+
+def _generate_task_output_files(job, filenames, locale=None):
+    locale_output_path = f"{locale}/" if locale else ""
+    artifact_prefix = get_artifact_prefix(job)
+
+    data = list()
+    for filename in filenames:
+        data.append(
+            {
+                "type": "file",
+                "path": f"/home/worker/artifacts/{filename}",
+                "name": f"{artifact_prefix}/{locale_output_path}{filename}",
+            }
+        )
+    data.append(
+        {
+            "type": "file",
+            "path": "/home/worker/artifacts/manifest.json",
+            "name": f"{artifact_prefix}/{locale_output_path}manifest.json",
+        }
+    )
+    return data
+
+
+def identify_desired_signing_keys(project, product):
+    if project in ["mozilla-central", "comm-central", "oak"]:
+        return "nightly"
+    if project == "mozilla-beta":
+        if product == "devedition":
+            return "nightly"
+        return "release"
+    if (
+        project in ["mozilla-release", "comm-beta"]
+        or project.startswith("mozilla-esr")
+        or project.startswith("comm-esr")
+    ):
+        return "release"
+    return "dep1"
+
+
+@transforms.add
+def make_task_description(config, jobs):
+    # If no balrog release history, then don't generate partials
+    if not config.params.get("release_history"):
+        return
+    for job in jobs:
+        dep_job = job["primary-dependency"]
+
+        treeherder = inherit_treeherder_from_dep(job, dep_job)
+        treeherder.setdefault("symbol", "p(N)")
+
+        label = job.get("label", f"partials-{dep_job.label}")
+
+        dependencies = {dep_job.kind: dep_job.label}
+
+        attributes = copy_attributes_from_dependent_job(dep_job)
+        locale = dep_job.attributes.get("locale")
+        if locale:
+            attributes["locale"] = locale
+            treeherder["symbol"] = f"p({locale})"
+        attributes["shipping_phase"] = job["shipping-phase"]
+
+        build_locale = locale or "en-US"
+
+        build_platform = attributes["build_platform"]
+        builds = get_builds(
+            config.params["release_history"], build_platform, build_locale
+        )
+
+        # If the list is empty there's no available history for this platform
+        # and locale combination, so we can't build any partials.
+        if not builds:
+            continue
+
+        extra = {"funsize": {"partials": list()}}
+        update_number = 1
+
+        locale_suffix = ""
+        if locale:
+            locale_suffix = f"{locale}/"
+        artifact_path = "<{}/{}/{}target.complete.mar>".format(
+            dep_job.kind,
+            get_artifact_prefix(dep_job),
+            locale_suffix,
+        )
+        for build in sorted(builds):
+            partial_info = {
+                "locale": build_locale,
+                "from_mar": builds[build]["mar_url"],
+                "to_mar": {"artifact-reference": artifact_path},
+                "branch": config.params["project"],
+                "update_number": update_number,
+                "dest_mar": build,
+            }
+            if "product" in builds[build]:
+                partial_info["product"] = builds[build]["product"]
+            if "previousVersion" in builds[build]:
+                partial_info["previousVersion"] = builds[build]["previousVersion"]
+            if "previousBuildNumber" in builds[build]:
+                partial_info["previousBuildNumber"] = builds[build][
+                    "previousBuildNumber"
+                ]
+            extra["funsize"]["partials"].append(partial_info)
+            update_number += 1
+
+        level = config.params["level"]
+
+        worker = {
+            "artifacts": _generate_task_output_files(dep_job, builds.keys(), locale),
+            "implementation": "docker-worker",
+            "docker-image": {"in-tree": "funsize-update-generator"},
+            "os": "linux",
+            "max-run-time": 3600 if "asan" in dep_job.label else 1800,
+            "chain-of-trust": True,
+            "taskcluster-proxy": True,
+            "env": {
+                "SIGNING_CERT": identify_desired_signing_keys(
+                    config.params["project"], config.params["release_product"]
+                ),
+                "EXTRA_PARAMS": f"--arch={architecture(build_platform)}",
+                "MAR_CHANNEL_ID": attributes["mar-channel-id"],
+            },
+        }
+        if release_level(config.params["project"]) == "staging":
+            worker["env"]["FUNSIZE_ALLOW_STAGING_PREFIXES"] = "true"
+
+        task = {
+            "label": label,
+            "description": f"{dep_job.description} Partials",
+            "worker-type": "b-linux-gcp",
+            "dependencies": dependencies,
+            "scopes": [],
+            "attributes": attributes,
+            "run-on-projects": dep_job.attributes.get("run_on_projects"),
+            "treeherder": treeherder,
+            "extra": extra,
+            "worker": worker,
+        }
+
+        # We only want caching on linux/windows due to bug 1436977
+        if int(level) == 3 and any(
+            [build_platform.startswith(prefix) for prefix in ["linux", "win"]]
+        ):
+            task["scopes"].append(
+                "auth:aws-s3:read-write:tc-gp-private-1d-us-east-1/releng/mbsdiff-cache/"
+            )
+
+        yield task
diff --git a/taskcluster/gecko_taskgraph/transforms/partner_attribution.py b/taskcluster/gecko_taskgraph/transforms/partner_attribution.py
new file mode 100644
index 0000000000..0bd5e0d141
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/partner_attribution.py
@@ -0,0 +1,129 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+Transform the partner attribution task into an actual task description.
+"""
+
+
+import json
+import logging
+from collections import defaultdict
+
+from taskgraph.transforms.base import TransformSequence
+
+from gecko_taskgraph.util.partners import (
+    apply_partner_priority,
+    check_if_partners_enabled,
+    generate_attribution_code,
+    get_partner_config_by_kind,
+)
+
+log = logging.getLogger(__name__)
+
+transforms = TransformSequence()
+transforms.add(check_if_partners_enabled)
+transforms.add(apply_partner_priority)
+
+
+@transforms.add
+def add_command_arguments(config, tasks):
+    enabled_partners = config.params.get("release_partners")
+    dependencies = {}
+    fetches = defaultdict(set)
+    attributions = []
+    release_artifacts = []
+    attribution_config = get_partner_config_by_kind(config, config.kind)
+
+    for partner_config in attribution_config.get("configs", []):
+        # we might only be interested in a subset of all partners, eg for a respin
+        if enabled_partners and partner_config["campaign"] not in enabled_partners:
+            continue
+        attribution_code = generate_attribution_code(
+            attribution_config["defaults"], partner_config
+        )
+        for platform in partner_config["platforms"]:
+            stage_platform = platform.replace("-shippable", "")
+            for locale in partner_config["locales"]:
+                # find the upstream, throw away locales we don't have, somehow. Skip ?
+                if locale == "en-US":
+                    upstream_label = "repackage-signing-{platform}/opt".format(
+                        platform=platform
+                    )
+                    upstream_artifact = "target.installer.exe"
+                else:
+                    upstream_label = (
+                        "repackage-signing-l10n-{locale}-{platform}/opt".format(
+                            locale=locale, platform=platform
+                        )
+                    )
+                    upstream_artifact = "{locale}/target.installer.exe".format(
+                        locale=locale
+                    )
+                if upstream_label not in config.kind_dependencies_tasks:
+                    raise Exception(f"Can't find upstream task for {platform} {locale}")
+                upstream = config.kind_dependencies_tasks[upstream_label]
+
+                # set the dependencies to just what we need rather than all of l10n
+                dependencies.update({upstream.label: upstream.label})
+
+                fetches[upstream_label].add((upstream_artifact, stage_platform, locale))
+
+                artifact_part = "{platform}/{locale}/target.installer.exe".format(
+                    platform=stage_platform, locale=locale
+                )
+                artifact = (
+                    "releng/partner/{partner}/{sub_partner}/{artifact_part}".format(
+                        partner=partner_config["campaign"],
+                        sub_partner=partner_config["content"],
+                        artifact_part=artifact_part,
+                    )
+                )
+                # config for script
+                # TODO - generalise input & output ??
+                #  add releng/partner prefix via get_artifact_prefix..()
+                attributions.append(
+                    {
+                        "input": f"/builds/worker/fetches/{artifact_part}",
+                        "output": f"/builds/worker/artifacts/{artifact}",
+                        "attribution": attribution_code,
+                    }
+                )
+                release_artifacts.append(artifact)
+
+    # bail-out early if we don't have any attributions to do
+    if not attributions:
+        return
+
+    for task in tasks:
+        worker = task.get("worker", {})
+        worker["chain-of-trust"] = True
+
+        task.setdefault("dependencies", {}).update(dependencies)
+        task.setdefault("fetches", {})
+        for upstream_label, upstream_artifacts in fetches.items():
+            task["fetches"][upstream_label] = [
+                {
+                    "artifact": upstream_artifact,
+                    "dest": "{platform}/{locale}".format(
+                        platform=platform, locale=locale
+                    ),
+                    "extract": False,
+                    "verify-hash": True,
+                }
+                for upstream_artifact, platform, locale in upstream_artifacts
+            ]
+        worker.setdefault("env", {})["ATTRIBUTION_CONFIG"] = json.dumps(
+            attributions, sort_keys=True
+        )
+        worker["artifacts"] = [
+            {
+                "name": "releng/partner",
+                "path": "/builds/worker/artifacts/releng/partner",
+                "type": "directory",
+            }
+        ]
+        task.setdefault("attributes", {})["release_artifacts"] = release_artifacts
+        task["label"] = config.kind
+
+        yield task
diff --git a/taskcluster/gecko_taskgraph/transforms/partner_attribution_beetmover.py b/taskcluster/gecko_taskgraph/transforms/partner_attribution_beetmover.py
new file mode 100644
index 0000000000..b2c435dd81
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/partner_attribution_beetmover.py
@@ -0,0 +1,202 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+Transform the beetmover task into an actual task description.
+"""
+
+from collections import defaultdict
+from copy import deepcopy
+
+from taskgraph.transforms.base import TransformSequence
+from taskgraph.util.schema import optionally_keyed_by, resolve_keyed_by
+from taskgraph.util.taskcluster import get_artifact_prefix
+from voluptuous import Any, Optional, Required
+
+from gecko_taskgraph.loader.single_dep import schema
+from gecko_taskgraph.transforms.beetmover import craft_release_properties
+from gecko_taskgraph.transforms.task import task_description_schema
+from gecko_taskgraph.util.attributes import (
+    copy_attributes_from_dependent_job,
+    release_level,
+)
+from gecko_taskgraph.util.partners import (
+    apply_partner_priority,
+    get_partner_config_by_kind,
+)
+from gecko_taskgraph.util.scriptworker import (
+    add_scope_prefix,
+    get_beetmover_bucket_scope,
+)
+
+beetmover_description_schema = schema.extend(
+    {
+        # depname is used in taskref's to identify the taskID of the unsigned things
+        Required("depname", default="build"): str,
+        # unique label to describe this beetmover task, defaults to {dep.label}-beetmover
+        Optional("label"): str,
+        Required("partner-bucket-scope"): optionally_keyed_by("release-level", str),
+        Required("partner-public-path"): Any(None, str),
+        Required("partner-private-path"): Any(None, str),
+        Optional("extra"): object,
+        Required("shipping-phase"): task_description_schema["shipping-phase"],
+        Optional("shipping-product"): task_description_schema["shipping-product"],
+        Optional("priority"): task_description_schema["priority"],
+    }
+)
+
+transforms = TransformSequence()
+transforms.add_validate(beetmover_description_schema)
+transforms.add(apply_partner_priority)
+
+
+@transforms.add
+def resolve_keys(config, jobs):
+    for job in jobs:
+        resolve_keyed_by(
+            job,
+            "partner-bucket-scope",
+            item_name=job["label"],
+            **{"release-level": release_level(config.params["project"])},
+        )
+        yield job
+
+
+@transforms.add
+def split_public_and_private(config, jobs):
+    # we need to separate private vs public destinations because beetmover supports one
+    # in a single task. Only use a single task for each type though.
+    partner_config = get_partner_config_by_kind(config, config.kind)
+    for job in jobs:
+        upstream_artifacts = job["primary-dependency"].attributes.get(
+            "release_artifacts"
+        )
+        attribution_task_ref = "<{}>".format(job["primary-dependency"].label)
+        prefix = get_artifact_prefix(job["primary-dependency"])
+        artifacts = defaultdict(list)
+        for artifact in upstream_artifacts:
+            partner, sub_partner, platform, locale, _ = artifact.replace(
+                prefix + "/", ""
+            ).split("/", 4)
+            destination = "private"
+            this_config = [
+                p
+                for p in partner_config["configs"]
+                if (p["campaign"] == partner and p["content"] == sub_partner)
+            ]
+            if this_config[0].get("upload_to_candidates"):
+                destination = "public"
+            artifacts[destination].append(
+                (artifact, partner, sub_partner, platform, locale)
+            )
+
+        action_scope = add_scope_prefix(config, "beetmover:action:push-to-partner")
+        public_bucket_scope = get_beetmover_bucket_scope(config)
+        partner_bucket_scope = add_scope_prefix(config, job["partner-bucket-scope"])
+        repl_dict = {
+            "build_number": config.params["build_number"],
+            "release_partner_build_number": config.params[
+                "release_partner_build_number"
+            ],
+            "version": config.params["version"],
+            "partner": "{partner}",  # we'll replace these later, per artifact
+            "subpartner": "{subpartner}",
+            "platform": "{platform}",
+            "locale": "{locale}",
+        }
+        for destination, destination_artifacts in artifacts.items():
+            this_job = deepcopy(job)
+
+            if destination == "public":
+                this_job["scopes"] = [public_bucket_scope, action_scope]
+                this_job["partner_public"] = True
+            else:
+                this_job["scopes"] = [partner_bucket_scope, action_scope]
+                this_job["partner_public"] = False
+
+            partner_path_key = f"partner-{destination}-path"
+            partner_path = this_job[partner_path_key].format(**repl_dict)
+            this_job.setdefault("worker", {})[
+                "upstream-artifacts"
+            ] = generate_upstream_artifacts(
+                attribution_task_ref, destination_artifacts, partner_path
+            )
+
+            yield this_job
+
+
+@transforms.add
+def make_task_description(config, jobs):
+    for job in jobs:
+        dep_job = job["primary-dependency"]
+
+        attributes = dep_job.attributes
+        build_platform = attributes.get("build_platform")
+        if not build_platform:
+            raise Exception("Cannot find build platform!")
+
+        label = config.kind
+        description = "Beetmover for partner attribution"
+        if job["partner_public"]:
+            label = f"{label}-public"
+            description = f"{description} public"
+        else:
+            label = f"{label}-private"
+            description = f"{description} private"
+        attributes = copy_attributes_from_dependent_job(dep_job)
+
+        task = {
+            "label": label,
+            "description": description,
+            "dependencies": {dep_job.kind: dep_job.label},
+            "attributes": attributes,
+            "run-on-projects": dep_job.attributes.get("run_on_projects"),
+            "shipping-phase": job["shipping-phase"],
+            "shipping-product": job.get("shipping-product"),
+            "partner_public": job["partner_public"],
+            "worker": job["worker"],
+            "scopes": job["scopes"],
+        }
+        # we may have reduced the priority for partner jobs, otherwise task.py will set it
+        if job.get("priority"):
+            task["priority"] = job["priority"]
+
+        yield task
+
+
+def generate_upstream_artifacts(attribution_task, artifacts, partner_path):
+    upstream_artifacts = []
+    for artifact, partner, subpartner, platform, locale in artifacts:
+        upstream_artifacts.append(
+            {
+                "taskId": {"task-reference": attribution_task},
+                "taskType": "repackage",
+                "paths": [artifact],
+                "locale": partner_path.format(
+                    partner=partner,
+                    subpartner=subpartner,
+                    platform=platform,
+                    locale=locale,
+                ),
+            }
+        )
+
+    if not upstream_artifacts:
+        raise Exception("Couldn't find any upstream artifacts.")
+
+    return upstream_artifacts
+
+
+@transforms.add
+def make_task_worker(config, jobs):
+    for job in jobs:
+        job["worker-type"] = "beetmover"
+        worker = {
+            "implementation": "beetmover",
+            "release-properties": craft_release_properties(config, job),
+            "partner-public": job["partner_public"],
+        }
+        job["worker"].update(worker)
+        del job["partner_public"]
+
+        yield job
diff --git a/taskcluster/gecko_taskgraph/transforms/partner_repack.py b/taskcluster/gecko_taskgraph/transforms/partner_repack.py
new file mode 100644
index 0000000000..d164c10a59
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/partner_repack.py
@@ -0,0 +1,136 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+Transform the partner repack task into an actual task description.
+"""
+
+from taskgraph.transforms.base import TransformSequence
+from taskgraph.util.schema import resolve_keyed_by
+
+from gecko_taskgraph.util.attributes import release_level
+from gecko_taskgraph.util.partners import (
+    apply_partner_priority,
+    check_if_partners_enabled,
+    get_partner_config_by_kind,
+    get_partner_url_config,
+    get_repack_ids_by_platform,
+)
+from gecko_taskgraph.util.scriptworker import get_release_config
+
+transforms = TransformSequence()
+transforms.add(check_if_partners_enabled)
+transforms.add(apply_partner_priority)
+
+
+@transforms.add
+def skip_unnecessary_platforms(config, tasks):
+    for task in tasks:
+        if config.kind == "release-partner-repack":
+            platform = task["attributes"]["build_platform"]
+            repack_ids = get_repack_ids_by_platform(config, platform)
+            if not repack_ids:
+                continue
+        yield task
+
+
+@transforms.add
+def remove_mac_dependency(config, tasks):
+    """Remove mac dependency depending on current level
+    to accomodate for mac notarization not running on level 1
+    """
+    level = int(config.params.get("level", 0))
+    for task in tasks:
+        if "macosx" not in task["attributes"]["build_platform"]:
+            yield task
+            continue
+        skipped_kind = "mac-signing" if level == 3 else "mac-notarization"
+        for dep_label in list(task["dependencies"].keys()):
+            if skipped_kind in dep_label:
+                del task["dependencies"][dep_label]
+        yield task
+
+
+@transforms.add
+def populate_repack_manifests_url(config, tasks):
+    for task in tasks:
+        partner_url_config = get_partner_url_config(config.params, config.graph_config)
+
+        for k in partner_url_config:
+            if config.kind.startswith(k):
+                task["worker"].setdefault("env", {})[
+                    "REPACK_MANIFESTS_URL"
+                ] = partner_url_config[k]
+                break
+        else:
+            raise Exception("Can't find partner REPACK_MANIFESTS_URL")
+
+        for property in ("limit-locales",):
+            property = f"extra.{property}"
+            resolve_keyed_by(
+                task,
+                property,
+                property,
+                **{"release-level": release_level(config.params["project"])},
+            )
+
+        if task["worker"]["env"]["REPACK_MANIFESTS_URL"].startswith("git@"):
+            task.setdefault("scopes", []).append(
+                "secrets:get:project/releng/gecko/build/level-{level}/partner-github-ssh".format(
+                    **config.params
+                )
+            )
+
+        yield task
+
+
+@transforms.add
+def make_label(config, tasks):
+    for task in tasks:
+        task["label"] = "{}-{}".format(config.kind, task["name"])
+        yield task
+
+
+@transforms.add
+def add_command_arguments(config, tasks):
+    release_config = get_release_config(config)
+
+    # staging releases - pass reduced set of locales to the repacking script
+    all_locales = set()
+    partner_config = get_partner_config_by_kind(config, config.kind)
+    for partner in partner_config.values():
+        for sub_partner in partner.values():
+            all_locales.update(sub_partner.get("locales", []))
+
+    for task in tasks:
+        # add the MOZHARNESS_OPTIONS, eg version=61.0, build-number=1, platform=win64
+        if not task["attributes"]["build_platform"].endswith("-shippable"):
+            raise Exception(
+                "Unexpected partner repack platform: {}".format(
+                    task["attributes"]["build_platform"],
+                ),
+            )
+        platform = task["attributes"]["build_platform"].partition("-shippable")[0]
+        task["run"]["options"] = [
+            "version={}".format(release_config["version"]),
+            "build-number={}".format(release_config["build_number"]),
+            f"platform={platform}",
+        ]
+        if task["extra"]["limit-locales"]:
+            for locale in all_locales:
+                task["run"]["options"].append(f"limit-locale={locale}")
+        if "partner" in config.kind and config.params["release_partners"]:
+            for partner in config.params["release_partners"]:
+                task["run"]["options"].append(f"partner={partner}")
+
+        # The upstream taskIds are stored a special environment variable, because we want to use
+        # task-reference's to resolve dependencies, but the string handling of MOZHARNESS_OPTIONS
+        # blocks that. It's space-separated string of ids in the end.
+        task["worker"]["env"]["UPSTREAM_TASKIDS"] = {
+            "task-reference": " ".join([f"<{dep}>" for dep in task["dependencies"]])
+        }
+
+        # Forward the release type for bouncer product construction
+        task["worker"]["env"]["RELEASE_TYPE"] = config.params["release_type"]
+
+        yield task
diff --git a/taskcluster/gecko_taskgraph/transforms/partner_signing.py b/taskcluster/gecko_taskgraph/transforms/partner_signing.py
new file mode 100644
index 0000000000..c9b6b7a8cc
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/partner_signing.py
@@ -0,0 +1,66 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+Transform the signing task into an actual task description.
+"""
+
+from taskgraph.transforms.base import TransformSequence
+
+from gecko_taskgraph.util.attributes import copy_attributes_from_dependent_job
+from gecko_taskgraph.util.partners import get_partner_config_by_kind
+from gecko_taskgraph.util.signed_artifacts import (
+    generate_specifications_of_artifacts_to_sign,
+)
+
+transforms = TransformSequence()
+
+
+@transforms.add
+def set_mac_label(config, jobs):
+    for job in jobs:
+        dep_job = job["primary-dependency"]
+        if "mac-notarization" in config.kind:
+            default_label = dep_job.label.replace("mac-signing", "mac-notarization")
+            job.setdefault("label", default_label)
+        assert job["label"] != dep_job.label, "Unable to determine label for {}".format(
+            config.kind
+        )
+        yield job
+
+
+@transforms.add
+def define_upstream_artifacts(config, jobs):
+    partner_configs = get_partner_config_by_kind(config, config.kind)
+    if not partner_configs:
+        return
+
+    for job in jobs:
+        dep_job = job["primary-dependency"]
+        job["depname"] = dep_job.label
+        job["attributes"] = copy_attributes_from_dependent_job(dep_job)
+
+        repack_ids = job["extra"]["repack_ids"]
+        artifacts_specifications = generate_specifications_of_artifacts_to_sign(
+            config,
+            job,
+            keep_locale_template=True,
+            kind=config.kind,
+        )
+        task_type = "build"
+        if "notarization" in job["depname"] or "mac-signing" in job["depname"]:
+            task_type = "scriptworker"
+        job["upstream-artifacts"] = [
+            {
+                "taskId": {"task-reference": f"<{dep_job.kind}>"},
+                "taskType": task_type,
+                "paths": [
+                    path_template.format(locale=repack_id)
+                    for path_template in spec["artifacts"]
+                    for repack_id in repack_ids
+                ],
+                "formats": spec["formats"],
+            }
+            for spec in artifacts_specifications
+        ]
+        yield job
diff --git a/taskcluster/gecko_taskgraph/transforms/per_platform_dummy.py b/taskcluster/gecko_taskgraph/transforms/per_platform_dummy.py
new file mode 100644
index 0000000000..5237f4f281
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/per_platform_dummy.py
@@ -0,0 +1,33 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+Transform the repackage task into an actual task description.
+"""
+
+from taskgraph.transforms.base import TransformSequence
+
+from gecko_taskgraph.util.attributes import copy_attributes_from_dependent_job
+
+transforms = TransformSequence()
+
+
+@transforms.add
+def one_task_per_product_and_platform(config, jobs):
+    unique_products_and_platforms = set()
+    for job in jobs:
+        dep_task = job["primary-dependency"]
+        if "primary-dependency" in job:
+            del job["primary-dependency"]
+        product = dep_task.attributes.get("shipping_product")
+        platform = dep_task.attributes.get("build_platform")
+        if (product, platform) not in unique_products_and_platforms:
+            attr_denylist = ("l10n_chunk", "locale", "artifact_map", "artifact_prefix")
+            attributes = copy_attributes_from_dependent_job(
+                dep_task, denylist=attr_denylist
+            )
+            attributes.update(job.get("attributes", {}))
+            job["attributes"] = attributes
+            job["name"] = f"{product}-{platform}"
+            yield job
+            unique_products_and_platforms.add((product, platform))
diff --git a/taskcluster/gecko_taskgraph/transforms/perftest.py b/taskcluster/gecko_taskgraph/transforms/perftest.py
new file mode 100644
index 0000000000..5c579b48b5
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/perftest.py
@@ -0,0 +1,351 @@
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+This transform passes options from `mach perftest` to the corresponding task.
+"""
+
+
+import json
+from copy import deepcopy
+from datetime import date, timedelta
+
+from taskgraph.transforms.base import TransformSequence
+from taskgraph.util.schema import Schema, optionally_keyed_by, resolve_keyed_by
+from taskgraph.util.treeherder import join_symbol, split_symbol
+from voluptuous import Any, Extra, Optional
+
+transforms = TransformSequence()
+
+
+perftest_description_schema = Schema(
+    {
+        # The test names and the symbols to use for them: [test-symbol, test-path]
+        Optional("perftest"): [[str]],
+        # Metrics to gather for the test. These will be merged
+        # with options specified through perftest-perfherder-global
+        Optional("perftest-metrics"): optionally_keyed_by(
+            "perftest",
+            Any(
+                [str],
+                {str: Any(None, {str: Any(None, str, [str])})},
+            ),
+        ),
+        # Perfherder data options that will be applied to
+        # all metrics gathered.
+        Optional("perftest-perfherder-global"): optionally_keyed_by(
+            "perftest", {str: Any(None, str, [str])}
+        ),
+        # Extra options to add to the test's command
+        Optional("perftest-extra-options"): optionally_keyed_by("perftest", [str]),
+        # Variants of the test to make based on extra browsertime
+        # arguments. Expecting:
+        #    [variant-suffix, options-to-use]
+        # If variant-suffix is `null` then the options will be added
+        # to the existing task. Otherwise, a new variant is created
+        # with the given suffix and with its options replaced.
+        Optional("perftest-btime-variants"): optionally_keyed_by(
+            "perftest", [[Any(None, str)]]
+        ),
+        # These options will be parsed in the next schemas
+        Extra: object,
+    }
+)
+
+
+transforms.add_validate(perftest_description_schema)
+
+
+@transforms.add
+def split_tests(config, jobs):
+    for job in jobs:
+        if job.get("perftest") is None:
+            yield job
+            continue
+
+        for test_symbol, test_name in job.pop("perftest"):
+            job_new = deepcopy(job)
+
+            job_new["perftest"] = test_symbol
+            job_new["name"] += "-" + test_symbol
+            job_new["treeherder"]["symbol"] = job["treeherder"]["symbol"].format(
+                symbol=test_symbol
+            )
+            job_new["run"]["command"] = job["run"]["command"].replace(
+                "{perftest_testname}", test_name
+            )
+
+            yield job_new
+
+
+@transforms.add
+def handle_keyed_by_perftest(config, jobs):
+    fields = ["perftest-metrics", "perftest-extra-options", "perftest-btime-variants"]
+    for job in jobs:
+        if job.get("perftest") is None:
+            yield job
+            continue
+
+        for field in fields:
+            resolve_keyed_by(job, field, item_name=job["name"])
+
+        job.pop("perftest")
+        yield job
+
+
+@transforms.add
+def parse_perftest_metrics(config, jobs):
+    """Parse the metrics into a dictionary immediately.
+
+    This way we can modify the extraOptions field (and others) entry through the
+    transforms that come later. The metrics aren't formatted until the end of the
+    transforms.
+    """
+    for job in jobs:
+        if job.get("perftest-metrics") is None:
+            yield job
+            continue
+        perftest_metrics = job.pop("perftest-metrics")
+
+        # If perftest metrics is a string, split it up first
+        if isinstance(perftest_metrics, list):
+            new_metrics_info = [{"name": metric} for metric in perftest_metrics]
+        else:
+            new_metrics_info = []
+            for metric, options in perftest_metrics.items():
+                entry = {"name": metric}
+                entry.update(options)
+                new_metrics_info.append(entry)
+
+        job["perftest-metrics"] = new_metrics_info
+        yield job
+
+
+@transforms.add
+def split_perftest_variants(config, jobs):
+    for job in jobs:
+        if job.get("variants") is None:
+            yield job
+            continue
+
+        for variant in job.pop("variants"):
+            job_new = deepcopy(job)
+
+            group, symbol = split_symbol(job_new["treeherder"]["symbol"])
+            group += "-" + variant
+            job_new["treeherder"]["symbol"] = join_symbol(group, symbol)
+            job_new["name"] += "-" + variant
+            job_new.setdefault("perftest-perfherder-global", {}).setdefault(
+                "extraOptions", []
+            ).append(variant)
+            job_new[variant] = True
+
+            yield job_new
+
+        yield job
+
+
+@transforms.add
+def split_btime_variants(config, jobs):
+    for job in jobs:
+        if job.get("perftest-btime-variants") is None:
+            yield job
+            continue
+
+        variants = job.pop("perftest-btime-variants")
+        if not variants:
+            yield job
+            continue
+
+        yield_existing = False
+        for suffix, options in variants:
+            if suffix is None:
+                # Append options to the existing job
+                job.setdefault("perftest-btime-variants", []).append(options)
+                yield_existing = True
+            else:
+                job_new = deepcopy(job)
+                group, symbol = split_symbol(job_new["treeherder"]["symbol"])
+                symbol += "-" + suffix
+                job_new["treeherder"]["symbol"] = join_symbol(group, symbol)
+                job_new["name"] += "-" + suffix
+                job_new.setdefault("perftest-perfherder-global", {}).setdefault(
+                    "extraOptions", []
+                ).append(suffix)
+                # Replace the existing options with the new ones
+                job_new["perftest-btime-variants"] = [options]
+                yield job_new
+
+        # The existing job has been modified so we should also return it
+        if yield_existing:
+            yield job
+
+
+@transforms.add
+def setup_http3_tests(config, jobs):
+    for job in jobs:
+        if job.get("http3") is None or not job.pop("http3"):
+            yield job
+            continue
+        job.setdefault("perftest-btime-variants", []).append(
+            "firefox.preference=network.http.http3.enable:true"
+        )
+        yield job
+
+
+@transforms.add
+def setup_perftest_metrics(config, jobs):
+    for job in jobs:
+        if job.get("perftest-metrics") is None:
+            yield job
+            continue
+        perftest_metrics = job.pop("perftest-metrics")
+
+        # Options to apply to each metric
+        global_options = job.pop("perftest-perfherder-global", {})
+        for metric_info in perftest_metrics:
+            for opt, val in global_options.items():
+                if isinstance(val, list) and opt in metric_info:
+                    metric_info[opt].extend(val)
+                elif not (isinstance(val, list) and len(val) == 0):
+                    metric_info[opt] = val
+
+        quote_escape = '\\"'
+        if "win" in job.get("platform", ""):
+            # Escaping is a bit different on windows platforms
+            quote_escape = '\\\\\\"'
+
+        job["run"]["command"] = job["run"]["command"].replace(
+            "{perftest_metrics}",
+            " ".join(
+                [
+                    ",".join(
+                        [
+                            ":".join(
+                                [
+                                    option,
+                                    str(value)
+                                    .replace(" ", "")
+                                    .replace("'", quote_escape),
+                                ]
+                            )
+                            for option, value in metric_info.items()
+                        ]
+                    )
+                    for metric_info in perftest_metrics
+                ]
+            ),
+        )
+
+        yield job
+
+
+@transforms.add
+def setup_perftest_browsertime_variants(config, jobs):
+    for job in jobs:
+        if job.get("perftest-btime-variants") is None:
+            yield job
+            continue
+
+        job["run"]["command"] += " --browsertime-extra-options %s" % ",".join(
+            [opt.strip() for opt in job.pop("perftest-btime-variants")]
+        )
+
+        yield job
+
+
+@transforms.add
+def setup_perftest_extra_options(config, jobs):
+    for job in jobs:
+        if job.get("perftest-extra-options") is None:
+            yield job
+            continue
+        job["run"]["command"] += " " + " ".join(job.pop("perftest-extra-options"))
+        yield job
+
+
+@transforms.add
+def pass_perftest_options(config, jobs):
+    for job in jobs:
+        env = job.setdefault("worker", {}).setdefault("env", {})
+        env["PERFTEST_OPTIONS"] = json.dumps(
+            config.params["try_task_config"].get("perftest-options")
+        )
+        yield job
+
+
+@transforms.add
+def setup_perftest_test_date(config, jobs):
+    for job in jobs:
+        if (
+            job.get("attributes", {}).get("batch", False)
+            and "--test-date" not in job["run"]["command"]
+        ):
+            yesterday = (date.today() - timedelta(1)).strftime("%Y.%m.%d")
+            job["run"]["command"] += " --test-date %s" % yesterday
+        yield job
+
+
+@transforms.add
+def setup_regression_detector(config, jobs):
+    for job in jobs:
+        if "change-detector" in job.get("name"):
+
+            tasks_to_analyze = []
+            for task in config.params["try_task_config"].get("tasks", []):
+                # Explicitly skip these tasks since they're
+                # part of the mozperftest tasks
+                if "side-by-side" in task:
+                    continue
+                if "change-detector" in task:
+                    continue
+
+                # Select these tasks
+                if "browsertime" in task:
+                    tasks_to_analyze.append(task)
+                elif "talos" in task:
+                    tasks_to_analyze.append(task)
+                elif "awsy" in task:
+                    tasks_to_analyze.append(task)
+                elif "perftest" in task:
+                    tasks_to_analyze.append(task)
+
+            if len(tasks_to_analyze) == 0:
+                yield job
+                continue
+
+            # Make the change detector task depend on the tasks to analyze.
+            # This prevents the task from running until all data is available
+            # within the current push.
+            job["soft-dependencies"] = tasks_to_analyze
+            job["requires"] = "all-completed"
+
+            new_project = config.params["project"]
+            if (
+                "try" in config.params["project"]
+                or config.params["try_mode"] == "try_select"
+            ):
+                new_project = "try"
+
+            base_project = None
+            if (
+                config.params.get("try_task_config", {})
+                .get("env", {})
+                .get("PERF_BASE_REVISION", None)
+                is not None
+            ):
+                task_names = " --task-name ".join(tasks_to_analyze)
+                base_revision = config.params["try_task_config"]["env"][
+                    "PERF_BASE_REVISION"
+                ]
+                base_project = new_project
+
+                # Add all the required information to the task
+                job["run"]["command"] = job["run"]["command"].format(
+                    task_name=task_names,
+                    base_revision=base_revision,
+                    base_branch=base_project,
+                    new_branch=new_project,
+                    new_revision=config.params["head_rev"],
+                )
+
+        yield job
diff --git a/taskcluster/gecko_taskgraph/transforms/python_update.py b/taskcluster/gecko_taskgraph/transforms/python_update.py
new file mode 100644
index 0000000000..f4f135b585
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/python_update.py
@@ -0,0 +1,25 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+Transform the repo-update task into an actual task description.
+"""
+
+from taskgraph.transforms.base import TransformSequence
+from taskgraph.util.schema import resolve_keyed_by
+
+transforms = TransformSequence()
+
+
+@transforms.add
+def resolve_keys(config, tasks):
+    for task in tasks:
+        env = task["worker"].setdefault("env", {})
+        env["BRANCH"] = config.params["project"]
+        for envvar in env:
+            resolve_keyed_by(env, envvar, envvar, **config.params)
+
+        for envvar in list(env.keys()):
+            if not env.get(envvar):
+                del env[envvar]
+        yield task
diff --git a/taskcluster/gecko_taskgraph/transforms/release.py b/taskcluster/gecko_taskgraph/transforms/release.py
new file mode 100644
index 0000000000..1158252fe7
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/release.py
@@ -0,0 +1,20 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+"""
+Transforms for release tasks
+"""
+
+
+def run_on_releases(config, jobs):
+    """
+    Filter out jobs with `run-on-releases` set, and that don't match the
+    `release_type` paramater.
+    """
+    for job in jobs:
+        release_type = config.params["release_type"]
+        run_on_release_types = job.pop("run-on-releases", None)
+
+        if run_on_release_types is None or release_type in run_on_release_types:
+            yield job
diff --git a/taskcluster/gecko_taskgraph/transforms/release_beetmover_signed_addons.py b/taskcluster/gecko_taskgraph/transforms/release_beetmover_signed_addons.py
new file mode 100644
index 0000000000..fb8eb91f44
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/release_beetmover_signed_addons.py
@@ -0,0 +1,243 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+Transform the beetmover task into an actual task description.
+"""
+
+import copy
+import logging
+
+from taskgraph.transforms.base import TransformSequence
+from taskgraph.util.schema import optionally_keyed_by, resolve_keyed_by
+from taskgraph.util.treeherder import inherit_treeherder_from_dep
+from voluptuous import Optional, Required
+
+from gecko_taskgraph.loader.single_dep import schema
+from gecko_taskgraph.transforms.beetmover import craft_release_properties
+from gecko_taskgraph.transforms.task import task_description_schema
+from gecko_taskgraph.util.attributes import (
+    copy_attributes_from_dependent_job,
+    release_level,
+)
+from gecko_taskgraph.util.scriptworker import (
+    generate_beetmover_artifact_map,
+    generate_beetmover_upstream_artifacts,
+    get_beetmover_action_scope,
+    get_beetmover_bucket_scope,
+)
+
+logger = logging.getLogger(__name__)
+
+
+transforms = TransformSequence()
+
+
+beetmover_description_schema = schema.extend(
+    {
+        # attributes is used for enabling artifact-map by declarative artifacts
+        Required("attributes"): {str: object},
+        # unique label to describe this beetmover task, defaults to {dep.label}-beetmover
+        Optional("label"): str,
+        # treeherder is allowed here to override any defaults we use for beetmover.  See
+        # taskcluster/gecko_taskgraph/transforms/task.py for the schema details, and the
+        # below transforms for defaults of various values.
+        Optional("treeherder"): task_description_schema["treeherder"],
+        Required("description"): str,
+        Required("worker-type"): optionally_keyed_by("release-level", str),
+        Required("run-on-projects"): [],
+        # locale is passed only for l10n beetmoving
+        Optional("locale"): str,
+        Optional("shipping-phase"): task_description_schema["shipping-phase"],
+        Optional("shipping-product"): task_description_schema["shipping-product"],
+    }
+)
+
+
+transforms.add_validate(beetmover_description_schema)
+
+
+@transforms.add
+def resolve_keys(config, jobs):
+    for job in jobs:
+        for field in ("worker-type", "attributes.artifact_map"):
+            resolve_keyed_by(
+                job,
+                field,
+                item_name=job["label"],
+                **{
+                    "release-level": release_level(config.params["project"]),
+                    "release-type": config.params["release_type"],
+                    "project": config.params["project"],
+                },
+            )
+        yield job
+
+
+@transforms.add
+def make_task_description(config, jobs):
+    for job in jobs:
+        dep_job = job["primary-dependency"]
+        attributes = dep_job.attributes
+
+        treeherder = inherit_treeherder_from_dep(job, dep_job)
+        treeherder.setdefault(
+            "symbol", "langpack(BM{})".format(attributes.get("l10n_chunk", ""))
+        )
+
+        job["attributes"].update(copy_attributes_from_dependent_job(dep_job))
+        job["attributes"]["chunk_locales"] = dep_job.attributes.get(
+            "chunk_locales", ["en-US"]
+        )
+
+        job["description"] = job["description"].format(
+            locales="/".join(job["attributes"]["chunk_locales"]),
+            platform=job["attributes"]["build_platform"],
+        )
+
+        job["scopes"] = [
+            get_beetmover_bucket_scope(config),
+            get_beetmover_action_scope(config),
+        ]
+
+        job["dependencies"] = {"langpack-copy": dep_job.label}
+
+        job["run-on-projects"] = job.get(
+            "run_on_projects", dep_job.attributes["run_on_projects"]
+        )
+        job["treeherder"] = treeherder
+        job["shipping-phase"] = job.get(
+            "shipping-phase", dep_job.attributes["shipping_phase"]
+        )
+        job["shipping-product"] = dep_job.attributes["shipping_product"]
+
+        yield job
+
+
+@transforms.add
+def make_task_worker(config, jobs):
+    for job in jobs:
+        platform = job["attributes"]["build_platform"]
+        locale = job["attributes"]["chunk_locales"]
+
+        job["worker"] = {
+            "implementation": "beetmover",
+            "release-properties": craft_release_properties(config, job),
+            "upstream-artifacts": generate_beetmover_upstream_artifacts(
+                config,
+                job,
+                platform,
+                locale,
+            ),
+            "artifact-map": generate_beetmover_artifact_map(
+                config, job, platform=platform, locale=locale
+            ),
+        }
+
+        yield job
+
+
+@transforms.add
+def strip_unused_data(config, jobs):
+    for job in jobs:
+        del job["primary-dependency"]
+
+        yield job
+
+
+@transforms.add
+def yield_all_platform_jobs(config, jobs):
+    # Even though langpacks are now platform independent, we keep beetmoving them at old
+    # platform-specific locations. That's why this transform exist
+    # The linux64 and mac specific ja-JP-mac are beetmoved along with the signing beetmover
+    # So while the dependent jobs are linux here, we only yield jobs for other platforms
+    for job in jobs:
+        platforms = ("linux", "macosx64", "win32", "win64")
+        if "devedition" in job["attributes"]["build_platform"]:
+            platforms = (f"{plat}-devedition" for plat in platforms)
+        for platform in platforms:
+            platform_job = copy.deepcopy(job)
+            if "ja" in platform_job["attributes"]["chunk_locales"] and platform in (
+                "macosx64",
+                "macosx64-devedition",
+            ):
+                platform_job = _strip_ja_data_from_linux_job(platform_job)
+
+            platform_job = _change_platform_data(config, platform_job, platform)
+
+            yield platform_job
+
+
+def _strip_ja_data_from_linux_job(platform_job):
+    # Let's take "ja" out the description. This locale is in a substring like "aa/bb/cc/dd", where
+    # "ja" could be any of "aa", "bb", "cc", "dd"
+    platform_job["description"] = platform_job["description"].replace("ja/", "")
+    platform_job["description"] = platform_job["description"].replace("/ja", "")
+
+    platform_job["worker"]["upstream-artifacts"] = [
+        artifact
+        for artifact in platform_job["worker"]["upstream-artifacts"]
+        if artifact["locale"] != "ja"
+    ]
+
+    return platform_job
+
+
+def _change_platform_in_artifact_map_paths(paths, orig_platform, new_platform):
+    amended_paths = {}
+    for artifact, artifact_info in paths.items():
+        amended_artifact_info = {
+            "checksums_path": artifact_info["checksums_path"].replace(
+                orig_platform, new_platform
+            ),
+            "destinations": [
+                d.replace(orig_platform, new_platform)
+                for d in artifact_info["destinations"]
+            ],
+        }
+        amended_paths[artifact] = amended_artifact_info
+
+    return amended_paths
+
+
+def _change_platform_data(config, platform_job, platform):
+    orig_platform = "linux64"
+    if "devedition" in platform:
+        orig_platform = "linux64-devedition"
+    platform_job["attributes"]["build_platform"] = platform
+    platform_job["label"] = platform_job["label"].replace(orig_platform, platform)
+    platform_job["description"] = platform_job["description"].replace(
+        orig_platform, platform
+    )
+    platform_job["treeherder"]["platform"] = platform_job["treeherder"][
+        "platform"
+    ].replace(orig_platform, platform)
+    platform_job["worker"]["release-properties"]["platform"] = platform
+
+    # amend artifactMap entries as well
+    platform_mapping = {
+        "linux64": "linux-x86_64",
+        "linux": "linux-i686",
+        "macosx64": "mac",
+        "win32": "win32",
+        "win64": "win64",
+        "linux64-devedition": "linux-x86_64",
+        "linux-devedition": "linux-i686",
+        "macosx64-devedition": "mac",
+        "win32-devedition": "win32",
+        "win64-devedition": "win64",
+    }
+    orig_platform = platform_mapping.get(orig_platform, orig_platform)
+    platform = platform_mapping.get(platform, platform)
+    platform_job["worker"]["artifact-map"] = [
+        {
+            "locale": entry["locale"],
+            "taskId": entry["taskId"],
+            "paths": _change_platform_in_artifact_map_paths(
+                entry["paths"], orig_platform, platform
+            ),
+        }
+        for entry in platform_job["worker"]["artifact-map"]
+    ]
+
+    return platform_job
diff --git a/taskcluster/gecko_taskgraph/transforms/release_deps.py b/taskcluster/gecko_taskgraph/transforms/release_deps.py
new file mode 100644
index 0000000000..e44af576eb
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/release_deps.py
@@ -0,0 +1,61 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+Add dependencies to release tasks.
+"""
+
+from taskgraph.transforms.base import TransformSequence
+
+PHASES = ["build", "promote", "push", "ship"]
+
+transforms = TransformSequence()
+
+
+@transforms.add
+def add_dependencies(config, jobs):
+    for job in jobs:
+        dependencies = {}
+        # Add any kind_dependencies_tasks with matching product as dependencies
+        product = job.get("shipping-product")
+        phase = job.get("shipping-phase")
+        if product is None:
+            continue
+
+        required_signoffs = set(
+            job.setdefault("attributes", {}).get("required_signoffs", [])
+        )
+        for dep_task in config.kind_dependencies_tasks.values():
+            # Weed out unwanted tasks.
+            # XXX we have run-on-projects which specifies the on-push behavior;
+            # we need another attribute that specifies release promotion,
+            # possibly which action(s) each task belongs in.
+
+            # We can only depend on tasks in the current or previous phases
+            dep_phase = dep_task.attributes.get("shipping_phase")
+            if dep_phase and PHASES.index(dep_phase) > PHASES.index(phase):
+                continue
+
+            if dep_task.attributes.get("build_platform") and job.get(
+                "attributes", {}
+            ).get("build_platform"):
+                if (
+                    dep_task.attributes["build_platform"]
+                    != job["attributes"]["build_platform"]
+                ):
+                    continue
+            # Add matching product tasks to deps
+            if (
+                dep_task.task.get("shipping-product") == product
+                or dep_task.attributes.get("shipping_product") == product
+            ):
+                dependencies[dep_task.label] = dep_task.label
+                required_signoffs.update(
+                    dep_task.attributes.get("required_signoffs", [])
+                )
+
+        job.setdefault("dependencies", {}).update(dependencies)
+        if required_signoffs:
+            job["attributes"]["required_signoffs"] = sorted(required_signoffs)
+
+        yield job
diff --git a/taskcluster/gecko_taskgraph/transforms/release_flatpak_push.py b/taskcluster/gecko_taskgraph/transforms/release_flatpak_push.py
new file mode 100644
index 0000000000..8a336502e6
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/release_flatpak_push.py
@@ -0,0 +1,79 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+Transform the release-flatpak-push kind into an actual task description.
+"""
+
+from taskgraph.transforms.base import TransformSequence
+from taskgraph.util.schema import Schema, optionally_keyed_by, resolve_keyed_by
+from voluptuous import Optional, Required
+
+from gecko_taskgraph.transforms.task import task_description_schema
+from gecko_taskgraph.util.attributes import release_level
+from gecko_taskgraph.util.scriptworker import add_scope_prefix
+
+push_flatpak_description_schema = Schema(
+    {
+        Required("name"): str,
+        Required("job-from"): task_description_schema["job-from"],
+        Required("dependencies"): task_description_schema["dependencies"],
+        Required("description"): task_description_schema["description"],
+        Required("treeherder"): task_description_schema["treeherder"],
+        Required("run-on-projects"): task_description_schema["run-on-projects"],
+        Required("worker-type"): optionally_keyed_by("release-level", str),
+        Required("worker"): object,
+        Optional("scopes"): [str],
+        Required("shipping-phase"): task_description_schema["shipping-phase"],
+        Required("shipping-product"): task_description_schema["shipping-product"],
+        Optional("extra"): task_description_schema["extra"],
+        Optional("attributes"): task_description_schema["attributes"],
+    }
+)
+
+transforms = TransformSequence()
+transforms.add_validate(push_flatpak_description_schema)
+
+
+@transforms.add
+def make_task_description(config, jobs):
+    for job in jobs:
+        if len(job["dependencies"]) != 1:
+            raise Exception("Exactly 1 dependency is required")
+
+        job["worker"]["upstream-artifacts"] = generate_upstream_artifacts(
+            job["dependencies"]
+        )
+
+        resolve_keyed_by(
+            job,
+            "worker.channel",
+            item_name=job["name"],
+            **{"release-type": config.params["release_type"]},
+        )
+        resolve_keyed_by(
+            job,
+            "worker-type",
+            item_name=job["name"],
+            **{"release-level": release_level(config.params["project"])},
+        )
+        if release_level(config.params["project"]) == "production":
+            job.setdefault("scopes", []).append(
+                add_scope_prefix(
+                    config,
+                    "flathub:firefox:{}".format(job["worker"]["channel"]),
+                )
+            )
+
+        yield job
+
+
+def generate_upstream_artifacts(dependencies):
+    return [
+        {
+            "taskId": {"task-reference": f"<{task_kind}>"},
+            "taskType": "build",
+            "paths": ["public/build/target.flatpak.tar.xz"],
+        }
+        for task_kind in dependencies.keys()
+    ]
diff --git a/taskcluster/gecko_taskgraph/transforms/release_flatpak_repackage.py b/taskcluster/gecko_taskgraph/transforms/release_flatpak_repackage.py
new file mode 100644
index 0000000000..7af1134c3a
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/release_flatpak_repackage.py
@@ -0,0 +1,42 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+from taskgraph.transforms.base import TransformSequence
+from taskgraph.util.schema import resolve_keyed_by
+
+from gecko_taskgraph.util.attributes import release_level
+from gecko_taskgraph.util.scriptworker import get_release_config
+
+transforms = TransformSequence()
+
+
+@transforms.add
+def format(config, tasks):
+    """Apply format substitution to worker.env and worker.command."""
+
+    format_params = {
+        "release_config": get_release_config(config),
+        "config_params": config.params,
+    }
+
+    for task in tasks:
+        format_params["task"] = task
+
+        command = task.get("worker", {}).get("command", [])
+        task["worker"]["command"] = [x.format(**format_params) for x in command]
+
+        env = task.get("worker", {}).get("env", {})
+        for k in env.keys():
+            resolve_keyed_by(
+                env,
+                k,
+                "flatpak envs",
+                **{
+                    "release-level": release_level(config.params["project"]),
+                    "project": config.params["project"],
+                }
+            )
+            task["worker"]["env"][k] = env[k].format(**format_params)
+
+        yield task
diff --git a/taskcluster/gecko_taskgraph/transforms/release_generate_checksums.py b/taskcluster/gecko_taskgraph/transforms/release_generate_checksums.py
new file mode 100644
index 0000000000..0024b88726
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/release_generate_checksums.py
@@ -0,0 +1,53 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+Transform the checksums task into an actual task description.
+"""
+
+import copy
+import logging
+
+from taskgraph.transforms.base import TransformSequence
+from taskgraph.util.schema import resolve_keyed_by
+
+from gecko_taskgraph.util.attributes import release_level
+from gecko_taskgraph.util.scriptworker import get_release_config
+
+logger = logging.getLogger(__name__)
+
+transforms = TransformSequence()
+
+
+@transforms.add
+def handle_keyed_by(config, jobs):
+    """Resolve fields that can be keyed by project, etc."""
+    fields = [
+        "run.config",
+        "run.extra-config",
+    ]
+    for job in jobs:
+        job = copy.deepcopy(job)
+        for field in fields:
+            resolve_keyed_by(
+                item=job,
+                field=field,
+                item_name=job["name"],
+                **{"release-level": release_level(config.params["project"])}
+            )
+        yield job
+
+
+@transforms.add
+def interpolate(config, jobs):
+    release_config = get_release_config(config)
+    for job in jobs:
+        mh_options = list(job["run"]["options"])
+        job["run"]["options"] = [
+            option.format(
+                version=release_config["version"],
+                build_number=release_config["build_number"],
+            )
+            for option in mh_options
+        ]
+        yield job
diff --git a/taskcluster/gecko_taskgraph/transforms/release_generate_checksums_beetmover.py b/taskcluster/gecko_taskgraph/transforms/release_generate_checksums_beetmover.py
new file mode 100644
index 0000000000..c91e807b27
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/release_generate_checksums_beetmover.py
@@ -0,0 +1,118 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+Transform the `release-generate-checksums-beetmover` task to also append `build` as dependency
+"""
+
+from taskgraph.transforms.base import TransformSequence
+from voluptuous import Optional
+
+from gecko_taskgraph.loader.single_dep import schema
+from gecko_taskgraph.transforms.beetmover import craft_release_properties
+from gecko_taskgraph.transforms.task import task_description_schema
+from gecko_taskgraph.util.attributes import copy_attributes_from_dependent_job
+from gecko_taskgraph.util.scriptworker import (
+    generate_beetmover_artifact_map,
+    generate_beetmover_upstream_artifacts,
+    get_beetmover_action_scope,
+    get_beetmover_bucket_scope,
+)
+
+transforms = TransformSequence()
+
+
+release_generate_checksums_beetmover_schema = schema.extend(
+    {
+        # unique label to describe this beetmover task, defaults to {dep.label}-beetmover
+        Optional("label"): str,
+        # treeherder is allowed here to override any defaults we use for beetmover.  See
+        # taskcluster/gecko_taskgraph/transforms/task.py for the schema details, and the
+        # below transforms for defaults of various values.
+        Optional("treeherder"): task_description_schema["treeherder"],
+        Optional("shipping-phase"): task_description_schema["shipping-phase"],
+        Optional("shipping-product"): task_description_schema["shipping-product"],
+        Optional("attributes"): task_description_schema["attributes"],
+    }
+)
+
+transforms = TransformSequence()
+transforms.add_validate(release_generate_checksums_beetmover_schema)
+
+
+@transforms.add
+def make_task_description(config, jobs):
+    for job in jobs:
+        dep_job = job["primary-dependency"]
+        attributes = copy_attributes_from_dependent_job(dep_job)
+        attributes.update(job.get("attributes", {}))
+
+        treeherder = job.get("treeherder", {})
+        treeherder.setdefault("symbol", "BM-SGenChcks")
+        dep_th_platform = (
+            dep_job.task.get("extra", {})
+            .get("treeherder", {})
+            .get("machine", {})
+            .get("platform", "")
+        )
+        treeherder.setdefault("platform", f"{dep_th_platform}/opt")
+        treeherder.setdefault("tier", 1)
+        treeherder.setdefault("kind", "build")
+
+        job_template = f"{dep_job.label}"
+        label = job_template.replace("signing", "beetmover")
+
+        description = "Transfer *SUMS and *SUMMARY checksums file to S3."
+
+        # first dependency is the signing task for the *SUMS files
+        dependencies = {dep_job.kind: dep_job.label}
+
+        if len(dep_job.dependencies) > 1:
+            raise NotImplementedError(
+                "Can't beetmove a signing task with multiple dependencies"
+            )
+        # update the dependencies with the dependencies of the signing task
+        dependencies.update(dep_job.dependencies)
+
+        bucket_scope = get_beetmover_bucket_scope(config)
+        action_scope = get_beetmover_action_scope(config)
+
+        task = {
+            "label": label,
+            "description": description,
+            "worker-type": "beetmover",
+            "scopes": [bucket_scope, action_scope],
+            "dependencies": dependencies,
+            "attributes": attributes,
+            "run-on-projects": dep_job.attributes.get("run_on_projects"),
+            "treeherder": treeherder,
+            "shipping-phase": "promote",
+        }
+
+        yield task
+
+
+@transforms.add
+def make_task_worker(config, jobs):
+    for job in jobs:
+        valid_beetmover_job = len(job["dependencies"]) == 2 and any(
+            ["signing" in j for j in job["dependencies"]]
+        )
+        if not valid_beetmover_job:
+            raise NotImplementedError("Beetmover must have two dependencies.")
+
+        platform = job["attributes"]["build_platform"]
+        worker = {
+            "implementation": "beetmover",
+            "release-properties": craft_release_properties(config, job),
+            "upstream-artifacts": generate_beetmover_upstream_artifacts(
+                config, job, platform=None, locale=None
+            ),
+            "artifact-map": generate_beetmover_artifact_map(
+                config, job, platform=platform
+            ),
+        }
+
+        job["worker"] = worker
+
+        yield job
diff --git a/taskcluster/gecko_taskgraph/transforms/release_generate_checksums_signing.py b/taskcluster/gecko_taskgraph/transforms/release_generate_checksums_signing.py
new file mode 100644
index 0000000000..6dfee1d33b
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/release_generate_checksums_signing.py
@@ -0,0 +1,86 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+Transform the release-generate-checksums-signing task into task description.
+"""
+
+from taskgraph.transforms.base import TransformSequence
+from taskgraph.util.taskcluster import get_artifact_path
+from voluptuous import Optional
+
+from gecko_taskgraph.loader.single_dep import schema
+from gecko_taskgraph.transforms.task import task_description_schema
+from gecko_taskgraph.util.attributes import copy_attributes_from_dependent_job
+from gecko_taskgraph.util.scriptworker import get_signing_cert_scope
+
+release_generate_checksums_signing_schema = schema.extend(
+    {
+        Optional("label"): str,
+        Optional("treeherder"): task_description_schema["treeherder"],
+        Optional("shipping-product"): task_description_schema["shipping-product"],
+        Optional("shipping-phase"): task_description_schema["shipping-phase"],
+    }
+)
+
+transforms = TransformSequence()
+transforms.add_validate(release_generate_checksums_signing_schema)
+
+
+@transforms.add
+def make_release_generate_checksums_signing_description(config, jobs):
+    for job in jobs:
+        dep_job = job["primary-dependency"]
+        attributes = copy_attributes_from_dependent_job(dep_job)
+
+        treeherder = job.get("treeherder", {})
+        treeherder.setdefault("symbol", "SGenChcks")
+        dep_th_platform = (
+            dep_job.task.get("extra", {})
+            .get("treeherder", {})
+            .get("machine", {})
+            .get("platform", "")
+        )
+        treeherder.setdefault("platform", f"{dep_th_platform}/opt")
+        treeherder.setdefault("tier", 1)
+        treeherder.setdefault("kind", "build")
+
+        job_template = "{}-{}".format(dep_job.label, "signing")
+        label = job.get("label", job_template)
+        description = "Signing of the overall release-related checksums"
+
+        dependencies = {dep_job.kind: dep_job.label}
+
+        upstream_artifacts = [
+            {
+                "taskId": {"task-reference": f"<{str(dep_job.kind)}>"},
+                "taskType": "build",
+                "paths": [
+                    get_artifact_path(dep_job, "SHA256SUMS"),
+                    get_artifact_path(dep_job, "SHA512SUMS"),
+                ],
+                "formats": ["autograph_gpg"],
+            }
+        ]
+
+        signing_cert_scope = get_signing_cert_scope(config)
+
+        task = {
+            "label": label,
+            "description": description,
+            "worker-type": "linux-signing",
+            "worker": {
+                "implementation": "scriptworker-signing",
+                "upstream-artifacts": upstream_artifacts,
+                "max-run-time": 3600,
+            },
+            "scopes": [
+                signing_cert_scope,
+            ],
+            "dependencies": dependencies,
+            "attributes": attributes,
+            "run-on-projects": dep_job.attributes.get("run_on_projects"),
+            "treeherder": treeherder,
+        }
+
+        yield task
diff --git a/taskcluster/gecko_taskgraph/transforms/release_mark_as_shipped.py b/taskcluster/gecko_taskgraph/transforms/release_mark_as_shipped.py
new file mode 100644
index 0000000000..f2ce148320
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/release_mark_as_shipped.py
@@ -0,0 +1,39 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+from taskgraph.transforms.base import TransformSequence
+from taskgraph.util.schema import resolve_keyed_by
+
+from gecko_taskgraph.util.attributes import release_level
+from gecko_taskgraph.util.scriptworker import get_release_config
+
+transforms = TransformSequence()
+
+
+@transforms.add
+def make_task_description(config, jobs):
+    release_config = get_release_config(config)
+    for job in jobs:
+        resolve_keyed_by(
+            job,
+            "worker-type",
+            item_name=job["name"],
+            **{"release-level": release_level(config.params["project"])}
+        )
+        resolve_keyed_by(
+            job,
+            "scopes",
+            item_name=job["name"],
+            **{"release-level": release_level(config.params["project"])}
+        )
+
+        job["worker"][
+            "release-name"
+        ] = "{product}-{version}-build{build_number}".format(
+            product=job["shipping-product"].capitalize(),
+            version=release_config["version"],
+            build_number=release_config["build_number"],
+        )
+
+        yield job
diff --git a/taskcluster/gecko_taskgraph/transforms/release_msix_push.py b/taskcluster/gecko_taskgraph/transforms/release_msix_push.py
new file mode 100644
index 0000000000..817341f92c
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/release_msix_push.py
@@ -0,0 +1,88 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+Transform the release-msix-push kind into an actual task description.
+"""
+
+from taskgraph.transforms.base import TransformSequence
+from taskgraph.util.schema import Schema, optionally_keyed_by, resolve_keyed_by
+from voluptuous import Optional, Required
+
+from gecko_taskgraph.transforms.task import task_description_schema
+from gecko_taskgraph.util.attributes import release_level
+from gecko_taskgraph.util.scriptworker import add_scope_prefix
+
+push_msix_description_schema = Schema(
+    {
+        Required("name"): str,
+        Required("job-from"): task_description_schema["job-from"],
+        Required("dependencies"): task_description_schema["dependencies"],
+        Required("description"): task_description_schema["description"],
+        Required("treeherder"): task_description_schema["treeherder"],
+        Required("run-on-projects"): task_description_schema["run-on-projects"],
+        Required("worker-type"): optionally_keyed_by("release-level", str),
+        Required("worker"): object,
+        Optional("scopes"): [str],
+        Required("shipping-phase"): task_description_schema["shipping-phase"],
+        Required("shipping-product"): task_description_schema["shipping-product"],
+        Optional("extra"): task_description_schema["extra"],
+        Optional("attributes"): task_description_schema["attributes"],
+    }
+)
+
+transforms = TransformSequence()
+transforms.add_validate(push_msix_description_schema)
+
+
+@transforms.add
+def make_task_description(config, jobs):
+    for job in jobs:
+
+        job["worker"]["upstream-artifacts"] = generate_upstream_artifacts(
+            job["dependencies"]
+        )
+
+        resolve_keyed_by(
+            job,
+            "worker.channel",
+            item_name=job["name"],
+            **{"release-type": config.params["release_type"]},
+        )
+        resolve_keyed_by(
+            job,
+            "worker.publish-mode",
+            item_name=job["name"],
+            **{"release-type": config.params["release_type"]},
+        )
+        resolve_keyed_by(
+            job,
+            "worker-type",
+            item_name=job["name"],
+            **{"release-level": release_level(config.params["project"])},
+        )
+        if release_level(config.params["project"]) == "production":
+            job.setdefault("scopes", []).append(
+                add_scope_prefix(
+                    config,
+                    "microsoftstore:{}".format(job["worker"]["channel"]),
+                )
+            )
+
+        # Override shipping-phase for release: push to the Store early to
+        # allow time for certification.
+        if job["worker"]["publish-mode"] == "Manual":
+            job["shipping-phase"] = "promote"
+
+        yield job
+
+
+def generate_upstream_artifacts(dependencies):
+    return [
+        {
+            "taskId": {"task-reference": f"<{task_kind}>"},
+            "taskType": "build",
+            "paths": ["public/build/target.store.msix"],
+        }
+        for task_kind in dependencies.keys()
+    ]
diff --git a/taskcluster/gecko_taskgraph/transforms/release_notifications.py b/taskcluster/gecko_taskgraph/transforms/release_notifications.py
new file mode 100644
index 0000000000..86109ec5ed
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/release_notifications.py
@@ -0,0 +1,73 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+Add notifications via taskcluster-notify for release tasks
+"""
+from string import Formatter
+
+from taskgraph.transforms.base import TransformSequence
+from taskgraph.util.schema import resolve_keyed_by
+
+from gecko_taskgraph.util.scriptworker import get_release_config
+
+transforms = TransformSequence()
+
+
+class TitleCaseFormatter(Formatter):
+    """Support title formatter for strings"""
+
+    def convert_field(self, value, conversion):
+        if conversion == "t":
+            return str(value).title()
+        super().convert_field(value, conversion)
+        return value
+
+
+titleformatter = TitleCaseFormatter()
+
+
+@transforms.add
+def add_notifications(config, jobs):
+    release_config = get_release_config(config)
+
+    for job in jobs:
+        label = "{}-{}".format(config.kind, job["name"])
+
+        notifications = job.pop("notifications", None)
+        if notifications:
+            resolve_keyed_by(
+                notifications, "emails", label, project=config.params["project"]
+            )
+            emails = notifications["emails"]
+            format_kwargs = dict(
+                task=job,
+                config=config.__dict__,
+                release_config=release_config,
+            )
+            subject = titleformatter.format(notifications["subject"], **format_kwargs)
+            message = titleformatter.format(notifications["message"], **format_kwargs)
+            emails = [email.format(**format_kwargs) for email in emails]
+
+            # By default, we only send mail on success to avoid messages like 'blah is in the
+            # candidates dir' when cancelling graphs, dummy job failure, etc
+            status_types = notifications.get("status-types", ["on-completed"])
+            for s in status_types:
+                job.setdefault("routes", []).extend(
+                    [f"notify.email.{email}.{s}" for email in emails]
+                )
+
+            # Customize the email subject to include release name and build number
+            job.setdefault("extra", {}).update(
+                {
+                    "notify": {
+                        "email": {
+                            "subject": subject,
+                        }
+                    }
+                }
+            )
+            if message:
+                job["extra"]["notify"]["email"]["content"] = message
+
+        yield job
diff --git a/taskcluster/gecko_taskgraph/transforms/release_sign_and_push_langpacks.py b/taskcluster/gecko_taskgraph/transforms/release_sign_and_push_langpacks.py
new file mode 100644
index 0000000000..17e4d37fb3
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/release_sign_and_push_langpacks.py
@@ -0,0 +1,180 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+Transform the release-sign-and-push task into an actual task description.
+"""
+
+from taskgraph.transforms.base import TransformSequence
+from taskgraph.util.schema import optionally_keyed_by, resolve_keyed_by
+from taskgraph.util.treeherder import inherit_treeherder_from_dep
+from voluptuous import Any, Required
+
+from gecko_taskgraph.loader.single_dep import schema
+from gecko_taskgraph.transforms.task import task_description_schema
+from gecko_taskgraph.util.attributes import (
+    copy_attributes_from_dependent_job,
+    release_level,
+)
+
+transforms = TransformSequence()
+
+langpack_sign_push_description_schema = schema.extend(
+    {
+        Required("label"): str,
+        Required("description"): str,
+        Required("worker-type"): optionally_keyed_by("release-level", str),
+        Required("worker"): {
+            Required("channel"): optionally_keyed_by(
+                "project", "platform", Any("listed", "unlisted")
+            ),
+            Required("upstream-artifacts"): None,  # Processed here below
+        },
+        Required("run-on-projects"): [],
+        Required("scopes"): optionally_keyed_by("release-level", [str]),
+        Required("shipping-phase"): task_description_schema["shipping-phase"],
+        Required("shipping-product"): task_description_schema["shipping-product"],
+    }
+)
+
+
+@transforms.add
+def set_label(config, jobs):
+    for job in jobs:
+        label = "push-langpacks-{}".format(job["primary-dependency"].label)
+        job["label"] = label
+
+        yield job
+
+
+transforms.add_validate(langpack_sign_push_description_schema)
+
+
+@transforms.add
+def resolve_keys(config, jobs):
+    for job in jobs:
+        resolve_keyed_by(
+            job,
+            "worker-type",
+            item_name=job["label"],
+            **{"release-level": release_level(config.params["project"])},
+        )
+        resolve_keyed_by(
+            job,
+            "scopes",
+            item_name=job["label"],
+            **{"release-level": release_level(config.params["project"])},
+        )
+        resolve_keyed_by(
+            job,
+            "worker.channel",
+            item_name=job["label"],
+            project=config.params["project"],
+            platform=job["primary-dependency"].attributes["build_platform"],
+        )
+
+        yield job
+
+
+@transforms.add
+def copy_attributes(config, jobs):
+    for job in jobs:
+        dep_job = job["primary-dependency"]
+        job["attributes"] = copy_attributes_from_dependent_job(dep_job)
+        job["attributes"]["chunk_locales"] = dep_job.attributes.get(
+            "chunk_locales", ["en-US"]
+        )
+
+        yield job
+
+
+@transforms.add
+def filter_out_macos_jobs_but_mac_only_locales(config, jobs):
+    for job in jobs:
+        build_platform = job["primary-dependency"].attributes.get("build_platform")
+
+        if build_platform in ("linux64-devedition", "linux64-shippable"):
+            yield job
+        elif (
+            build_platform in ("macosx64-devedition", "macosx64-shippable")
+            and "ja-JP-mac" in job["attributes"]["chunk_locales"]
+        ):
+            # Other locales of the same job shouldn't be processed
+            job["attributes"]["chunk_locales"] = ["ja-JP-mac"]
+            job["label"] = job["label"].replace(
+                # Guard against a chunk 10 or chunk 1 (latter on try) weird munging
+                "-{}/".format(job["attributes"]["l10n_chunk"]),
+                "-ja-JP-mac/",
+            )
+            yield job
+
+
+@transforms.add
+def make_task_description(config, jobs):
+    for job in jobs:
+        dep_job = job["primary-dependency"]
+
+        treeherder = inherit_treeherder_from_dep(job, dep_job)
+        treeherder.setdefault(
+            "symbol", "langpack(SnP{})".format(job["attributes"].get("l10n_chunk", ""))
+        )
+
+        job["description"] = job["description"].format(
+            locales="/".join(job["attributes"]["chunk_locales"]),
+        )
+
+        job["dependencies"] = {dep_job.kind: dep_job.label}
+        job["treeherder"] = treeherder
+
+        yield job
+
+
+def generate_upstream_artifacts(upstream_task_ref, locales):
+    return [
+        {
+            "taskId": {"task-reference": upstream_task_ref},
+            "taskType": "build",
+            "paths": [
+                "public/build{locale}/target.langpack.xpi".format(
+                    locale="" if locale == "en-US" else "/" + locale
+                )
+                for locale in locales
+            ],
+        }
+    ]
+
+
+@transforms.add
+def make_task_worker(config, jobs):
+    for job in jobs:
+        upstream_task_ref = get_upstream_task_ref(
+            job, expected_kinds=("build", "shippable-l10n")
+        )
+
+        job["worker"]["implementation"] = "push-addons"
+        job["worker"]["upstream-artifacts"] = generate_upstream_artifacts(
+            upstream_task_ref, job["attributes"]["chunk_locales"]
+        )
+
+        yield job
+
+
+def get_upstream_task_ref(job, expected_kinds):
+    upstream_tasks = [
+        job_kind
+        for job_kind in job["dependencies"].keys()
+        if job_kind in expected_kinds
+    ]
+
+    if len(upstream_tasks) > 1:
+        raise Exception("Only one dependency expected")
+
+    return f"<{upstream_tasks[0]}>"
+
+
+@transforms.add
+def strip_unused_data(config, jobs):
+    for job in jobs:
+        del job["primary-dependency"]
+
+        yield job
diff --git a/taskcluster/gecko_taskgraph/transforms/release_snap_repackage.py b/taskcluster/gecko_taskgraph/transforms/release_snap_repackage.py
new file mode 100644
index 0000000000..659a203971
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/release_snap_repackage.py
@@ -0,0 +1,39 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+from taskgraph.transforms.base import TransformSequence
+from taskgraph.util.schema import resolve_keyed_by
+
+from gecko_taskgraph.util.attributes import release_level
+from gecko_taskgraph.util.scriptworker import get_release_config
+
+transforms = TransformSequence()
+
+
+@transforms.add
+def format(config, tasks):
+    """Apply format substitution to worker.env and worker.command."""
+
+    format_params = {
+        "release_config": get_release_config(config),
+        "config_params": config.params,
+    }
+
+    for task in tasks:
+        format_params["task"] = task
+
+        command = task.get("worker", {}).get("command", [])
+        task["worker"]["command"] = [x.format(**format_params) for x in command]
+
+        env = task.get("worker", {}).get("env", {})
+        for k in env.keys():
+            resolve_keyed_by(
+                env,
+                k,
+                "snap envs",
+                **{"release-level": release_level(config.params["project"])}
+            )
+            task["worker"]["env"][k] = env[k].format(**format_params)
+
+        yield task
diff --git a/taskcluster/gecko_taskgraph/transforms/release_started.py b/taskcluster/gecko_taskgraph/transforms/release_started.py
new file mode 100644
index 0000000000..0f54c8e098
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/release_started.py
@@ -0,0 +1,52 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+Add notifications via taskcluster-notify for release tasks
+"""
+from pipes import quote as shell_quote
+
+from taskgraph.transforms.base import TransformSequence
+from taskgraph.util.schema import resolve_keyed_by
+
+transforms = TransformSequence()
+
+
+@transforms.add
+def add_notifications(config, jobs):
+    for job in jobs:
+        label = "{}-{}".format(config.kind, job["name"])
+
+        resolve_keyed_by(job, "emails", label, project=config.params["project"])
+        emails = [email.format(config=config.__dict__) for email in job.pop("emails")]
+
+        command = [
+            "release",
+            "send-buglist-email",
+            "--version",
+            config.params["version"],
+            "--product",
+            job["shipping-product"],
+            "--revision",
+            config.params["head_rev"],
+            "--build-number",
+            str(config.params["build_number"]),
+            "--repo",
+            config.params["head_repository"],
+        ]
+        for address in emails:
+            command += ["--address", address]
+        command += [
+            # We wrap this in `{'task-reference': ...}` below
+            "--task-group-id",
+            "<decision>",
+        ]
+
+        job["scopes"] = [f"notify:email:{address}" for address in emails]
+        job["run"] = {
+            "using": "mach",
+            "sparse-profile": "mach",
+            "mach": {"task-reference": " ".join(map(shell_quote, command))},
+        }
+
+        yield job
diff --git a/taskcluster/gecko_taskgraph/transforms/release_version_bump.py b/taskcluster/gecko_taskgraph/transforms/release_version_bump.py
new file mode 100644
index 0000000000..a0f3f69d05
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/release_version_bump.py
@@ -0,0 +1,42 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+Transform the update generation task into an actual task description.
+"""
+
+from taskgraph.transforms.base import TransformSequence
+from taskgraph.util.schema import resolve_keyed_by
+
+transforms = TransformSequence()
+
+
+@transforms.add
+def handle_keyed_by(config, tasks):
+    """Resolve fields that can be keyed by platform, etc."""
+    default_fields = [
+        "worker.push",
+        "worker.bump-files",
+        "worker-type",
+    ]
+    for task in tasks:
+        fields = default_fields[:]
+        for additional_field in (
+            "l10n-bump-info",
+            "source-repo",
+            "dontbuild",
+            "ignore-closed-tree",
+        ):
+            if additional_field in task["worker"]:
+                fields.append(f"worker.{additional_field}")
+        for field in fields:
+            resolve_keyed_by(
+                task,
+                field,
+                item_name=task["name"],
+                **{
+                    "project": config.params["project"],
+                    "release-type": config.params["release_type"],
+                },
+            )
+        yield task
diff --git a/taskcluster/gecko_taskgraph/transforms/repackage.py b/taskcluster/gecko_taskgraph/transforms/repackage.py
new file mode 100644
index 0000000000..2fe849c32d
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/repackage.py
@@ -0,0 +1,684 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+Transform the repackage task into an actual task description.
+"""
+
+from taskgraph.transforms.base import TransformSequence
+from taskgraph.util.schema import optionally_keyed_by, resolve_keyed_by
+from taskgraph.util.taskcluster import get_artifact_prefix
+from voluptuous import Extra, Optional, Required
+
+from gecko_taskgraph.loader.single_dep import schema
+from gecko_taskgraph.transforms.job import job_description_schema
+from gecko_taskgraph.util.attributes import copy_attributes_from_dependent_job
+from gecko_taskgraph.util.copy_task import copy_task
+from gecko_taskgraph.util.platforms import architecture, archive_format
+from gecko_taskgraph.util.workertypes import worker_type_implementation
+
+packaging_description_schema = schema.extend(
+    {
+        # unique label to describe this repackaging task
+        Optional("label"): str,
+        Optional("worker-type"): str,
+        Optional("worker"): object,
+        # treeherder is allowed here to override any defaults we use for repackaging.  See
+        # taskcluster/gecko_taskgraph/transforms/task.py for the schema details, and the
+        # below transforms for defaults of various values.
+        Optional("treeherder"): job_description_schema["treeherder"],
+        # If a l10n task, the corresponding locale
+        Optional("locale"): str,
+        # Routes specific to this task, if defined
+        Optional("routes"): [str],
+        # passed through directly to the job description
+        Optional("extra"): job_description_schema["extra"],
+        # passed through to job description
+        Optional("fetches"): job_description_schema["fetches"],
+        Optional("run-on-projects"): job_description_schema["run-on-projects"],
+        # Shipping product and phase
+        Optional("shipping-product"): job_description_schema["shipping-product"],
+        Optional("shipping-phase"): job_description_schema["shipping-phase"],
+        Required("package-formats"): optionally_keyed_by(
+            "build-platform", "release-type", [str]
+        ),
+        Optional("msix"): {
+            Optional("channel"): optionally_keyed_by(
+                "package-format",
+                "level",
+                "build-platform",
+                "release-type",
+                "shipping-product",
+                str,
+            ),
+            Optional("identity-name"): optionally_keyed_by(
+                "package-format",
+                "level",
+                "build-platform",
+                "release-type",
+                "shipping-product",
+                str,
+            ),
+            Optional("publisher"): optionally_keyed_by(
+                "package-format",
+                "level",
+                "build-platform",
+                "release-type",
+                "shipping-product",
+                str,
+            ),
+            Optional("publisher-display-name"): optionally_keyed_by(
+                "package-format",
+                "level",
+                "build-platform",
+                "release-type",
+                "shipping-product",
+                str,
+            ),
+            Optional("vendor"): str,
+        },
+        # All l10n jobs use mozharness
+        Required("mozharness"): {
+            Extra: object,
+            # Config files passed to the mozharness script
+            Required("config"): optionally_keyed_by("build-platform", [str]),
+            # Additional paths to look for mozharness configs in. These should be
+            # relative to the base of the source checkout
+            Optional("config-paths"): [str],
+            # if true, perform a checkout of a comm-central based branch inside the
+            # gecko checkout
+            Optional("comm-checkout"): bool,
+            Optional("run-as-root"): bool,
+            Optional("use-caches"): bool,
+        },
+    }
+)
+
+# The configuration passed to the mozharness repackage script. This defines the
+# arguments passed to `mach repackage`
+# - `args` is interpolated by mozharness (`{package-name}`, `{installer-tag}`,
+#   `{stub-installer-tag}`, `{sfx-stub}`, `{wsx-stub}`, `{fetch-dir}`), with values
+#    from mozharness.
+# - `inputs` are passed as long-options, with the filename prefixed by
+#   `MOZ_FETCH_DIR`. The filename is interpolated by taskgraph
+#   (`{archive_format}`).
+# - `output` is passed to `--output`, with the filename prefixed by the output
+#   directory.
+PACKAGE_FORMATS = {
+    "mar": {
+        "args": [
+            "mar",
+            "--arch",
+            "{architecture}",
+            "--mar-channel-id",
+            "{mar-channel-id}",
+        ],
+        "inputs": {
+            "input": "target{archive_format}",
+            "mar": "mar-tools/mar",
+        },
+        "output": "target.complete.mar",
+    },
+    "msi": {
+        "args": [
+            "msi",
+            "--wsx",
+            "{wsx-stub}",
+            "--version",
+            "{version_display}",
+            "--locale",
+            "{_locale}",
+            "--arch",
+            "{architecture}",
+            "--candle",
+            "{fetch-dir}/candle.exe",
+            "--light",
+            "{fetch-dir}/light.exe",
+        ],
+        "inputs": {
+            "setupexe": "target.installer.exe",
+        },
+        "output": "target.installer.msi",
+    },
+    "msix": {
+        "args": [
+            "msix",
+            "--channel",
+            "{msix-channel}",
+            "--publisher",
+            "{msix-publisher}",
+            "--publisher-display-name",
+            "{msix-publisher-display-name}",
+            "--identity-name",
+            "{msix-identity-name}",
+            "--vendor",
+            "{msix-vendor}",
+            "--arch",
+            "{architecture}",
+            # For langpacks.  Ignored if directory does not exist.
+            "--distribution-dir",
+            "{fetch-dir}/distribution",
+            "--verbose",
+            "--makeappx",
+            "{fetch-dir}/msix-packaging/makemsix",
+        ],
+        "inputs": {
+            "input": "target{archive_format}",
+        },
+        "output": "target.installer.msix",
+    },
+    "msix-store": {
+        "args": [
+            "msix",
+            "--channel",
+            "{msix-channel}",
+            "--publisher",
+            "{msix-publisher}",
+            "--publisher-display-name",
+            "{msix-publisher-display-name}",
+            "--identity-name",
+            "{msix-identity-name}",
+            "--vendor",
+            "{msix-vendor}",
+            "--arch",
+            "{architecture}",
+            # For langpacks.  Ignored if directory does not exist.
+            "--distribution-dir",
+            "{fetch-dir}/distribution",
+            "--verbose",
+            "--makeappx",
+            "{fetch-dir}/msix-packaging/makemsix",
+        ],
+        "inputs": {
+            "input": "target{archive_format}",
+        },
+        "output": "target.store.msix",
+    },
+    "dmg": {
+        "args": ["dmg"],
+        "inputs": {
+            "input": "target{archive_format}",
+        },
+        "output": "target.dmg",
+    },
+    "pkg": {
+        "args": ["pkg"],
+        "inputs": {
+            "input": "target{archive_format}",
+        },
+        "output": "target.pkg",
+    },
+    "installer": {
+        "args": [
+            "installer",
+            "--package-name",
+            "{package-name}",
+            "--tag",
+            "{installer-tag}",
+            "--sfx-stub",
+            "{sfx-stub}",
+        ],
+        "inputs": {
+            "package": "target{archive_format}",
+            "setupexe": "setup.exe",
+        },
+        "output": "target.installer.exe",
+    },
+    "installer-stub": {
+        "args": [
+            "installer",
+            "--tag",
+            "{stub-installer-tag}",
+            "--sfx-stub",
+            "{sfx-stub}",
+        ],
+        "inputs": {
+            "setupexe": "setup-stub.exe",
+        },
+        "output": "target.stub-installer.exe",
+    },
+    "deb": {
+        "args": [
+            "deb",
+            "--arch",
+            "{architecture}",
+            "--templates",
+            "browser/installer/linux/app/debian",
+            "--version",
+            "{version_display}",
+            "--build-number",
+            "{build_number}",
+            "--release-product",
+            "{release_product}",
+            "--release-type",
+            "{release_type}",
+        ],
+        "inputs": {
+            "input": "target{archive_format}",
+        },
+        "output": "target.deb",
+    },
+    "deb-l10n": {
+        "args": [
+            "deb-l10n",
+            "--version",
+            "{version_display}",
+            "--build-number",
+            "{build_number}",
+            "--templates",
+            "browser/installer/linux/langpack/debian",
+        ],
+        "inputs": {
+            "input-xpi-file": "target.langpack.xpi",
+            "input-tar-file": "target{archive_format}",
+        },
+        "output": "target.langpack.deb",
+    },
+}
+MOZHARNESS_EXPANSIONS = [
+    "package-name",
+    "installer-tag",
+    "fetch-dir",
+    "stub-installer-tag",
+    "sfx-stub",
+    "wsx-stub",
+]
+
+transforms = TransformSequence()
+transforms.add_validate(packaging_description_schema)
+
+
+@transforms.add
+def copy_in_useful_magic(config, jobs):
+    """Copy attributes from upstream task to be used for keyed configuration."""
+    for job in jobs:
+        dep = job["primary-dependency"]
+        job["build-platform"] = dep.attributes.get("build_platform")
+        job["shipping-product"] = dep.attributes.get("shipping_product")
+        yield job
+
+
+@transforms.add
+def handle_keyed_by(config, jobs):
+    """Resolve fields that can be keyed by platform, etc, but not `msix.*` fields
+    that can be keyed by `package-format`.  Such fields are handled specially below.
+    """
+    fields = [
+        "mozharness.config",
+        "package-formats",
+        "worker.max-run-time",
+    ]
+    for job in jobs:
+        job = copy_task(job)  # don't overwrite dict values here
+        for field in fields:
+            resolve_keyed_by(
+                item=job,
+                field=field,
+                item_name="?",
+                **{
+                    "release-type": config.params["release_type"],
+                    "level": config.params["level"],
+                },
+            )
+        yield job
+
+
+@transforms.add
+def make_repackage_description(config, jobs):
+    for job in jobs:
+        dep_job = job["primary-dependency"]
+
+        label = job.get("label", dep_job.label.replace("signing-", "repackage-"))
+        job["label"] = label
+
+        yield job
+
+
+@transforms.add
+def make_job_description(config, jobs):
+    for job in jobs:
+        dep_job = job["primary-dependency"]
+        dependencies = {dep_job.kind: dep_job.label}
+
+        attributes = copy_attributes_from_dependent_job(dep_job)
+        attributes["repackage_type"] = "repackage"
+
+        locale = attributes.get("locale", job.get("locale"))
+        if locale:
+            attributes["locale"] = locale
+
+        description = (
+            "Repackaging for locale '{locale}' for build '"
+            "{build_platform}/{build_type}'".format(
+                locale=attributes.get("locale", "en-US"),
+                build_platform=attributes.get("build_platform"),
+                build_type=attributes.get("build_type"),
+            )
+        )
+
+        treeherder = job.get("treeherder", {})
+        treeherder.setdefault("symbol", "Rpk")
+        dep_th_platform = dep_job.task.get("extra", {}).get("treeherder-platform")
+        treeherder.setdefault("platform", dep_th_platform)
+        treeherder.setdefault("tier", 1)
+        treeherder.setdefault("kind", "build")
+
+        # Search dependencies before adding langpack dependencies.
+        signing_task = None
+        repackage_signing_task = None
+        for dependency in dependencies.keys():
+            if "repackage-signing" in dependency:
+                repackage_signing_task = dependency
+            elif "signing" in dependency or "notarization" in dependency:
+                signing_task = dependency
+
+        if config.kind == "repackage-msi":
+            treeherder["symbol"] = "MSI({})".format(locale or "N")
+
+        elif config.kind == "repackage-msix":
+            assert not locale
+
+            # Like "MSIXs(Bs)".
+            treeherder["symbol"] = "MSIX({})".format(
+                dep_job.task.get("extra", {}).get("treeherder", {}).get("symbol", "B")
+            )
+
+        elif config.kind == "repackage-shippable-l10n-msix":
+            assert not locale
+
+            if attributes.get("l10n_chunk") or attributes.get("chunk_locales"):
+                # We don't want to produce MSIXes for single-locale repack builds.
+                continue
+
+            description = (
+                "Repackaging with multiple locales for build '"
+                "{build_platform}/{build_type}'".format(
+                    build_platform=attributes.get("build_platform"),
+                    build_type=attributes.get("build_type"),
+                )
+            )
+
+            # Like "MSIXs(Bs-multi)".
+            treeherder["symbol"] = "MSIX({}-multi)".format(
+                dep_job.task.get("extra", {}).get("treeherder", {}).get("symbol", "B")
+            )
+
+            fetches = job.setdefault("fetches", {})
+
+            # The keys are unique, like `shippable-l10n-signing-linux64-shippable-1/opt`, so we
+            # can't ask for the tasks directly, we must filter for them.
+            for t in config.kind_dependencies_tasks.values():
+                if t.kind != "shippable-l10n-signing":
+                    continue
+                if t.attributes["build_platform"] != "linux64-shippable":
+                    continue
+                if t.attributes["build_type"] != "opt":
+                    continue
+
+                dependencies.update({t.label: t.label})
+
+                fetches.update(
+                    {
+                        t.label: [
+                            {
+                                "artifact": f"{loc}/target.langpack.xpi",
+                                "extract": False,
+                                # Otherwise we can't disambiguate locales!
+                                "dest": f"distribution/extensions/{loc}",
+                            }
+                            for loc in t.attributes["chunk_locales"]
+                        ]
+                    }
+                )
+
+        elif config.kind == "repackage-deb":
+            attributes["repackage_type"] = "repackage-deb"
+            description = (
+                "Repackaging the '{build_platform}/{build_type}' "
+                "{version} build into a '.deb' package"
+            ).format(
+                build_platform=attributes.get("build_platform"),
+                build_type=attributes.get("build_type"),
+                version=config.params["version"],
+            )
+
+        _fetch_subst_locale = "en-US"
+        if locale:
+            _fetch_subst_locale = locale
+
+        worker_type = job["worker-type"]
+        build_platform = attributes["build_platform"]
+
+        use_stub = attributes.get("stub-installer")
+
+        repackage_config = []
+        package_formats = job.get("package-formats")
+        if use_stub and not repackage_signing_task and "msix" not in package_formats:
+            # if repackage_signing_task doesn't exists, generate the stub installer
+            package_formats += ["installer-stub"]
+        for format in package_formats:
+            command = copy_task(PACKAGE_FORMATS[format])
+            substs = {
+                "archive_format": archive_format(build_platform),
+                "_locale": _fetch_subst_locale,
+                "architecture": architecture(build_platform),
+                "version_display": config.params["version"],
+                "mar-channel-id": attributes["mar-channel-id"],
+                "build_number": config.params["build_number"],
+                "release_product": config.params["release_product"],
+                "release_type": config.params["release_type"],
+            }
+            # Allow us to replace `args` as well, but specifying things expanded in mozharness
+            # without breaking .format and without allowing unknown through.
+            substs.update({name: f"{{{name}}}" for name in MOZHARNESS_EXPANSIONS})
+
+            # We need to resolve `msix.*` values keyed by `package-format` for each format, not
+            # just once, so we update a temporary copy just for extracting these values.
+            temp_job = copy_task(job)
+            for msix_key in (
+                "channel",
+                "identity-name",
+                "publisher",
+                "publisher-display-name",
+                "vendor",
+            ):
+                resolve_keyed_by(
+                    item=temp_job,
+                    field=f"msix.{msix_key}",
+                    item_name="?",
+                    **{
+                        "package-format": format,
+                        "release-type": config.params["release_type"],
+                        "level": config.params["level"],
+                    },
+                )
+
+                # Turn `msix.channel` into `msix-channel`, etc.
+                value = temp_job.get("msix", {}).get(msix_key)
+                if value:
+                    substs.update(
+                        {f"msix-{msix_key}": value},
+                    )
+
+            command["inputs"] = {
+                name: filename.format(**substs)
+                for name, filename in command["inputs"].items()
+            }
+            command["args"] = [arg.format(**substs) for arg in command["args"]]
+            if "installer" in format and "aarch64" not in build_platform:
+                command["args"].append("--use-upx")
+
+            repackage_config.append(command)
+
+        run = job.get("mozharness", {})
+        run.update(
+            {
+                "using": "mozharness",
+                "script": "mozharness/scripts/repackage.py",
+                "job-script": "taskcluster/scripts/builder/repackage.sh",
+                "actions": ["setup", "repackage"],
+                "extra-config": {
+                    "repackage_config": repackage_config,
+                },
+                "run-as-root": run.get("run-as-root", False),
+                "use-caches": run.get("use-caches", True),
+            }
+        )
+
+        worker = job.get("worker", {})
+        worker.update(
+            {
+                "chain-of-trust": True,
+                # Don't add generic artifact directory.
+                "skip-artifacts": True,
+            }
+        )
+        worker.setdefault("max-run-time", 3600)
+
+        if locale:
+            # Make sure we specify the locale-specific upload dir
+            worker.setdefault("env", {})["LOCALE"] = locale
+
+        worker["artifacts"] = _generate_task_output_files(
+            dep_job,
+            worker_type_implementation(config.graph_config, config.params, worker_type),
+            repackage_config=repackage_config,
+            locale=locale,
+        )
+        attributes["release_artifacts"] = [
+            artifact["name"] for artifact in worker["artifacts"]
+        ]
+
+        task = {
+            "label": job["label"],
+            "description": description,
+            "worker-type": worker_type,
+            "dependencies": dependencies,
+            "if-dependencies": [dep_job.kind],
+            "attributes": attributes,
+            "run-on-projects": job.get(
+                "run-on-projects", dep_job.attributes.get("run_on_projects")
+            ),
+            "optimization": dep_job.optimization,
+            "treeherder": treeherder,
+            "routes": job.get("routes", []),
+            "extra": job.get("extra", {}),
+            "worker": worker,
+            "run": run,
+            "fetches": _generate_download_config(
+                config,
+                dep_job,
+                build_platform,
+                signing_task,
+                repackage_signing_task,
+                locale=locale,
+                existing_fetch=job.get("fetches"),
+            ),
+        }
+
+        if build_platform.startswith("macosx"):
+            task.setdefault("fetches", {}).setdefault("toolchain", []).extend(
+                [
+                    "linux64-libdmg",
+                    "linux64-hfsplus",
+                    "linux64-node",
+                    "linux64-xar",
+                    "linux64-mkbom",
+                ]
+            )
+
+        if "shipping-phase" in job:
+            task["shipping-phase"] = job["shipping-phase"]
+
+        yield task
+
+
+def _generate_download_config(
+    config,
+    task,
+    build_platform,
+    signing_task,
+    repackage_signing_task,
+    locale=None,
+    existing_fetch=None,
+):
+    locale_path = f"{locale}/" if locale else ""
+    fetch = {}
+    if existing_fetch:
+        fetch.update(existing_fetch)
+
+    if repackage_signing_task and build_platform.startswith("win"):
+        fetch.update(
+            {
+                repackage_signing_task: [f"{locale_path}target.installer.exe"],
+            }
+        )
+    elif build_platform.startswith("linux") or build_platform.startswith("macosx"):
+        signing_fetch = [
+            {
+                "artifact": "{}target{}".format(
+                    locale_path, archive_format(build_platform)
+                ),
+                "extract": False,
+            },
+        ]
+        if config.kind == "repackage-deb-l10n":
+            signing_fetch.append(
+                {
+                    "artifact": f"{locale_path}target.langpack.xpi",
+                    "extract": False,
+                }
+            )
+        fetch.update({signing_task: signing_fetch})
+    elif build_platform.startswith("win"):
+        fetch.update(
+            {
+                signing_task: [
+                    {
+                        "artifact": f"{locale_path}target.zip",
+                        "extract": False,
+                    },
+                    f"{locale_path}setup.exe",
+                ],
+            }
+        )
+
+        use_stub = task.attributes.get("stub-installer")
+        if use_stub:
+            fetch[signing_task].append(f"{locale_path}setup-stub.exe")
+
+    if fetch:
+        return fetch
+
+    raise NotImplementedError(f'Unsupported build_platform: "{build_platform}"')
+
+
+def _generate_task_output_files(
+    task, worker_implementation, repackage_config, locale=None
+):
+    locale_output_path = f"{locale}/" if locale else ""
+    artifact_prefix = get_artifact_prefix(task)
+
+    if worker_implementation == ("docker-worker", "linux"):
+        local_prefix = "/builds/worker/workspace/"
+    elif worker_implementation == ("generic-worker", "windows"):
+        local_prefix = "workspace/"
+    else:
+        raise NotImplementedError(
+            f'Unsupported worker implementation: "{worker_implementation}"'
+        )
+
+    output_files = []
+    for config in repackage_config:
+        output_files.append(
+            {
+                "type": "file",
+                "path": "{}outputs/{}{}".format(
+                    local_prefix, locale_output_path, config["output"]
+                ),
+                "name": "{}/{}{}".format(
+                    artifact_prefix, locale_output_path, config["output"]
+                ),
+            }
+        )
+    return output_files
diff --git a/taskcluster/gecko_taskgraph/transforms/repackage_l10n.py b/taskcluster/gecko_taskgraph/transforms/repackage_l10n.py
new file mode 100644
index 0000000000..e0f46e6fdc
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/repackage_l10n.py
@@ -0,0 +1,26 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+Transform the repackage task into an actual task description.
+"""
+
+
+from taskgraph.transforms.base import TransformSequence
+
+from gecko_taskgraph.util.copy_task import copy_task
+
+transforms = TransformSequence()
+
+
+@transforms.add
+def split_locales(config, jobs):
+    for job in jobs:
+        dep_job = job["primary-dependency"]
+        for locale in dep_job.attributes.get("chunk_locales", []):
+            locale_job = copy_task(job)  # don't overwrite dict values here
+            treeherder = locale_job.setdefault("treeherder", {})
+            treeherder_group = locale_job.pop("treeherder-group")
+            treeherder["symbol"] = f"{treeherder_group}({locale})"
+            locale_job["locale"] = locale
+            yield locale_job
diff --git a/taskcluster/gecko_taskgraph/transforms/repackage_partner.py b/taskcluster/gecko_taskgraph/transforms/repackage_partner.py
new file mode 100644
index 0000000000..582a86dfad
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/repackage_partner.py
@@ -0,0 +1,302 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+Transform the repackage task into an actual task description.
+"""
+
+
+import copy
+
+from taskgraph.transforms.base import TransformSequence
+from taskgraph.util.schema import optionally_keyed_by, resolve_keyed_by
+from taskgraph.util.taskcluster import get_artifact_prefix
+from voluptuous import Optional, Required
+
+from gecko_taskgraph.loader.single_dep import schema
+from gecko_taskgraph.transforms.repackage import (
+    PACKAGE_FORMATS as PACKAGE_FORMATS_VANILLA,
+)
+from gecko_taskgraph.transforms.task import task_description_schema
+from gecko_taskgraph.util.attributes import copy_attributes_from_dependent_job
+from gecko_taskgraph.util.partners import get_partner_config_by_kind
+from gecko_taskgraph.util.platforms import archive_format, executable_extension
+from gecko_taskgraph.util.workertypes import worker_type_implementation
+
+
+def _by_platform(arg):
+    return optionally_keyed_by("build-platform", arg)
+
+
+# When repacking the stub installer we need to pass a zip file and package name to the
+# repackage task. This is not needed for vanilla stub but analogous to the full installer.
+PACKAGE_FORMATS = copy.deepcopy(PACKAGE_FORMATS_VANILLA)
+PACKAGE_FORMATS["installer-stub"]["inputs"]["package"] = "target-stub{archive_format}"
+PACKAGE_FORMATS["installer-stub"]["args"].extend(["--package-name", "{package-name}"])
+
+packaging_description_schema = schema.extend(
+    {
+        # unique label to describe this repackaging task
+        Optional("label"): str,
+        # Routes specific to this task, if defined
+        Optional("routes"): [str],
+        # passed through directly to the job description
+        Optional("extra"): task_description_schema["extra"],
+        # Shipping product and phase
+        Optional("shipping-product"): task_description_schema["shipping-product"],
+        Optional("shipping-phase"): task_description_schema["shipping-phase"],
+        Required("package-formats"): _by_platform([str]),
+        # All l10n jobs use mozharness
+        Required("mozharness"): {
+            # Config files passed to the mozharness script
+            Required("config"): _by_platform([str]),
+            # Additional paths to look for mozharness configs in. These should be
+            # relative to the base of the source checkout
+            Optional("config-paths"): [str],
+            # if true, perform a checkout of a comm-central based branch inside the
+            # gecko checkout
+            Optional("comm-checkout"): bool,
+        },
+        # Override the default priority for the project
+        Optional("priority"): task_description_schema["priority"],
+    }
+)
+
+transforms = TransformSequence()
+transforms.add_validate(packaging_description_schema)
+
+
+@transforms.add
+def copy_in_useful_magic(config, jobs):
+    """Copy attributes from upstream task to be used for keyed configuration."""
+    for job in jobs:
+        dep = job["primary-dependency"]
+        job["build-platform"] = dep.attributes.get("build_platform")
+        yield job
+
+
+@transforms.add
+def handle_keyed_by(config, jobs):
+    """Resolve fields that can be keyed by platform, etc."""
+    fields = [
+        "mozharness.config",
+        "package-formats",
+    ]
+    for job in jobs:
+        job = copy.deepcopy(job)  # don't overwrite dict values here
+        for field in fields:
+            resolve_keyed_by(item=job, field=field, item_name="?")
+        yield job
+
+
+@transforms.add
+def make_repackage_description(config, jobs):
+    for job in jobs:
+        dep_job = job["primary-dependency"]
+
+        label = job.get("label", dep_job.label.replace("signing-", "repackage-"))
+        job["label"] = label
+
+        yield job
+
+
+@transforms.add
+def make_job_description(config, jobs):
+    for job in jobs:
+        dep_job = job["primary-dependency"]
+        attributes = copy_attributes_from_dependent_job(dep_job)
+        build_platform = attributes["build_platform"]
+
+        if job["build-platform"].startswith("win"):
+            if dep_job.kind.endswith("signing"):
+                continue
+        if job["build-platform"].startswith("macosx"):
+            if dep_job.kind.endswith("repack"):
+                continue
+        dependencies = {dep_job.attributes.get("kind"): dep_job.label}
+        dependencies.update(dep_job.dependencies)
+
+        signing_task = None
+        for dependency in dependencies.keys():
+            if build_platform.startswith("macosx") and dependency.endswith("signing"):
+                signing_task = dependency
+            elif build_platform.startswith("win") and dependency.endswith("repack"):
+                signing_task = dependency
+
+        attributes["repackage_type"] = "repackage"
+
+        repack_id = job["extra"]["repack_id"]
+
+        partner_config = get_partner_config_by_kind(config, config.kind)
+        partner, subpartner, _ = repack_id.split("/")
+        repack_stub_installer = partner_config[partner][subpartner].get(
+            "repack_stub_installer"
+        )
+        if build_platform.startswith("win32") and repack_stub_installer:
+            job["package-formats"].append("installer-stub")
+
+        repackage_config = []
+        for format in job.get("package-formats"):
+            command = copy.deepcopy(PACKAGE_FORMATS[format])
+            substs = {
+                "archive_format": archive_format(build_platform),
+                "executable_extension": executable_extension(build_platform),
+            }
+            command["inputs"] = {
+                name: filename.format(**substs)
+                for name, filename in command["inputs"].items()
+            }
+            repackage_config.append(command)
+
+        run = job.get("mozharness", {})
+        run.update(
+            {
+                "using": "mozharness",
+                "script": "mozharness/scripts/repackage.py",
+                "job-script": "taskcluster/scripts/builder/repackage.sh",
+                "actions": ["setup", "repackage"],
+                "extra-config": {
+                    "repackage_config": repackage_config,
+                },
+            }
+        )
+
+        worker = {
+            "chain-of-trust": True,
+            "max-run-time": 3600,
+            "taskcluster-proxy": True if get_artifact_prefix(dep_job) else False,
+            "env": {
+                "REPACK_ID": repack_id,
+            },
+            # Don't add generic artifact directory.
+            "skip-artifacts": True,
+        }
+
+        worker_type = "b-linux-gcp"
+        worker["docker-image"] = {"in-tree": "debian11-amd64-build"}
+
+        worker["artifacts"] = _generate_task_output_files(
+            dep_job,
+            worker_type_implementation(config.graph_config, config.params, worker_type),
+            repackage_config,
+            partner=repack_id,
+        )
+
+        description = (
+            "Repackaging for repack_id '{repack_id}' for build '"
+            "{build_platform}/{build_type}'".format(
+                repack_id=job["extra"]["repack_id"],
+                build_platform=attributes.get("build_platform"),
+                build_type=attributes.get("build_type"),
+            )
+        )
+
+        task = {
+            "label": job["label"],
+            "description": description,
+            "worker-type": worker_type,
+            "dependencies": dependencies,
+            "attributes": attributes,
+            "scopes": ["queue:get-artifact:releng/partner/*"],
+            "run-on-projects": dep_job.attributes.get("run_on_projects"),
+            "routes": job.get("routes", []),
+            "extra": job.get("extra", {}),
+            "worker": worker,
+            "run": run,
+            "fetches": _generate_download_config(
+                dep_job,
+                build_platform,
+                signing_task,
+                partner=repack_id,
+                project=config.params["project"],
+                repack_stub_installer=repack_stub_installer,
+            ),
+        }
+
+        # we may have reduced the priority for partner jobs, otherwise task.py will set it
+        if job.get("priority"):
+            task["priority"] = job["priority"]
+        if build_platform.startswith("macosx"):
+            task.setdefault("fetches", {}).setdefault("toolchain", []).extend(
+                [
+                    "linux64-libdmg",
+                    "linux64-hfsplus",
+                    "linux64-node",
+                ]
+            )
+        yield task
+
+
+def _generate_download_config(
+    task,
+    build_platform,
+    signing_task,
+    partner=None,
+    project=None,
+    repack_stub_installer=False,
+):
+    locale_path = f"{partner}/" if partner else ""
+
+    if build_platform.startswith("macosx"):
+        return {
+            signing_task: [
+                {
+                    "artifact": f"{locale_path}target.tar.gz",
+                    "extract": False,
+                },
+            ],
+        }
+    if build_platform.startswith("win"):
+        download_config = [
+            {
+                "artifact": f"{locale_path}target.zip",
+                "extract": False,
+            },
+            f"{locale_path}setup.exe",
+        ]
+        if build_platform.startswith("win32") and repack_stub_installer:
+            download_config.extend(
+                [
+                    {
+                        "artifact": f"{locale_path}target-stub.zip",
+                        "extract": False,
+                    },
+                    f"{locale_path}setup-stub.exe",
+                ]
+            )
+        return {signing_task: download_config}
+
+    raise NotImplementedError(f'Unsupported build_platform: "{build_platform}"')
+
+
+def _generate_task_output_files(task, worker_implementation, repackage_config, partner):
+    """We carefully generate an explicit list here, but there's an artifacts directory
+    too, courtesy of generic_worker_add_artifacts() (windows) or docker_worker_add_artifacts().
+    Any errors here are likely masked by that.
+    """
+    partner_output_path = f"{partner}/"
+    artifact_prefix = get_artifact_prefix(task)
+
+    if worker_implementation == ("docker-worker", "linux"):
+        local_prefix = "/builds/worker/workspace/"
+    elif worker_implementation == ("generic-worker", "windows"):
+        local_prefix = "workspace/"
+    else:
+        raise NotImplementedError(
+            f'Unsupported worker implementation: "{worker_implementation}"'
+        )
+
+    output_files = []
+    for config in repackage_config:
+        output_files.append(
+            {
+                "type": "file",
+                "path": "{}outputs/{}{}".format(
+                    local_prefix, partner_output_path, config["output"]
+                ),
+                "name": "{}/{}{}".format(
+                    artifact_prefix, partner_output_path, config["output"]
+                ),
+            }
+        )
+    return output_files
diff --git a/taskcluster/gecko_taskgraph/transforms/repackage_routes.py b/taskcluster/gecko_taskgraph/transforms/repackage_routes.py
new file mode 100644
index 0000000000..2973ee35bd
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/repackage_routes.py
@@ -0,0 +1,34 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+Add indexes to repackage kinds
+"""
+
+from taskgraph.transforms.base import TransformSequence
+
+transforms = TransformSequence()
+
+
+@transforms.add
+def add_indexes(config, jobs):
+    for job in jobs:
+        repackage_type = job["attributes"].get("repackage_type")
+        if repackage_type and job["attributes"]["build_type"] != "debug":
+            build_platform = job["attributes"]["build_platform"]
+            job_name = f"{build_platform}-{repackage_type}"
+            product = job.get("index", {}).get("product", "firefox")
+            index_type = "generic"
+            if job["attributes"].get("shippable") and job["attributes"].get("locale"):
+                index_type = "shippable-l10n"
+            if job["attributes"].get("shippable"):
+                index_type = "shippable"
+            if job["attributes"].get("locale"):
+                index_type = "l10n"
+            job["index"] = {
+                "job-name": job_name,
+                "product": product,
+                "type": index_type,
+            }
+
+        yield job
diff --git a/taskcluster/gecko_taskgraph/transforms/repackage_set_upstream_mac_kind.py b/taskcluster/gecko_taskgraph/transforms/repackage_set_upstream_mac_kind.py
new file mode 100644
index 0000000000..14c865eea5
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/repackage_set_upstream_mac_kind.py
@@ -0,0 +1,39 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+Transform mac notarization tasks
+"""
+
+from taskgraph.transforms.base import TransformSequence
+from taskgraph.util.schema import resolve_keyed_by
+
+transforms = TransformSequence()
+
+
+@transforms.add
+def repackage_set_upstream_mac_kind(config, tasks):
+    """
+    Notarization only runs on level 3
+    If level < 3 then repackage the mac-signing task artifact
+    Exception for debug builds, which will use signed build on level 3
+    """
+    for task in tasks:
+        if "macosx64" not in task["primary-dependency"].attributes["build_platform"]:
+            task.pop("upstream-mac-kind")
+            yield task
+            continue
+        resolve_keyed_by(
+            task,
+            "upstream-mac-kind",
+            item_name=config.kind,
+            **{
+                "build-type": task["primary-dependency"].attributes["build_type"],
+                "project": config.params.get("project"),
+            }
+        )
+        upstream_mac_kind = task.pop("upstream-mac-kind")
+
+        if task["primary-dependency"].kind != upstream_mac_kind:
+            continue
+        yield task
diff --git a/taskcluster/gecko_taskgraph/transforms/repackage_signing.py b/taskcluster/gecko_taskgraph/transforms/repackage_signing.py
new file mode 100644
index 0000000000..f98f8f0814
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/repackage_signing.py
@@ -0,0 +1,137 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+Transform the repackage signing task into an actual task description.
+"""
+
+import os
+
+from taskgraph.transforms.base import TransformSequence
+from voluptuous import Optional
+
+from gecko_taskgraph.loader.single_dep import schema
+from gecko_taskgraph.transforms.task import task_description_schema
+from gecko_taskgraph.util.attributes import copy_attributes_from_dependent_job
+from gecko_taskgraph.util.scriptworker import get_signing_cert_scope_per_platform
+
+repackage_signing_description_schema = schema.extend(
+    {
+        Optional("label"): str,
+        Optional("treeherder"): task_description_schema["treeherder"],
+        Optional("shipping-product"): task_description_schema["shipping-product"],
+        Optional("shipping-phase"): task_description_schema["shipping-phase"],
+    }
+)
+
+SIGNING_FORMATS = {
+    "target.installer.exe": ["autograph_authenticode_sha2_stub"],
+    "target.stub-installer.exe": ["autograph_authenticode_sha2_stub"],
+    "target.installer.msi": ["autograph_authenticode_sha2"],
+    "target.installer.msix": ["autograph_authenticode_sha2"],
+}
+
+transforms = TransformSequence()
+transforms.add_validate(repackage_signing_description_schema)
+
+
+@transforms.add
+def make_repackage_signing_description(config, jobs):
+    for job in jobs:
+        dep_job = job["primary-dependency"]
+        attributes = copy_attributes_from_dependent_job(dep_job)
+        locale = attributes.get("locale", dep_job.attributes.get("locale"))
+        attributes["repackage_type"] = "repackage-signing"
+
+        treeherder = job.get("treeherder", {})
+        treeherder.setdefault("symbol", "rs(B)")
+        dep_th_platform = dep_job.task.get("extra", {}).get("treeherder-platform")
+        treeherder.setdefault("platform", dep_th_platform)
+        treeherder.setdefault(
+            "tier", dep_job.task.get("extra", {}).get("treeherder", {}).get("tier", 1)
+        )
+        treeherder.setdefault("kind", "build")
+
+        if locale:
+            treeherder["symbol"] = f"rs({locale})"
+
+        if config.kind == "repackage-signing-msi":
+            treeherder["symbol"] = "MSIs({})".format(locale or "N")
+
+        elif config.kind in (
+            "repackage-signing-msix",
+            "repackage-signing-shippable-l10n-msix",
+        ):
+            # Like "MSIXs(Bs-multi)".
+            treeherder["symbol"] = "MSIXs({})".format(
+                dep_job.task.get("extra", {}).get("treeherder", {}).get("symbol", "B")
+            )
+
+        label = job["label"]
+
+        dep_kind = dep_job.kind
+        if "l10n" in dep_kind:
+            dep_kind = "repackage"
+
+        dependencies = {dep_kind: dep_job.label}
+
+        signing_dependencies = dep_job.dependencies
+        # This is so we get the build task etc in our dependencies to have better beetmover
+        # support.  But for multi-locale MSIX packages, we don't want the signing task to directly
+        # depend on the langpack tasks.
+        dependencies.update(
+            {
+                k: v
+                for k, v in signing_dependencies.items()
+                if k != "docker-image"
+                and not k.startswith("shippable-l10n-signing-linux64")
+            }
+        )
+
+        description = (
+            "Signing of repackaged artifacts for locale '{locale}' for build '"
+            "{build_platform}/{build_type}'".format(
+                locale=attributes.get("locale", "en-US"),
+                build_platform=attributes.get("build_platform"),
+                build_type=attributes.get("build_type"),
+            )
+        )
+
+        build_platform = dep_job.attributes.get("build_platform")
+        is_shippable = dep_job.attributes.get("shippable")
+        signing_cert_scope = get_signing_cert_scope_per_platform(
+            build_platform, is_shippable, config
+        )
+        scopes = [signing_cert_scope]
+
+        upstream_artifacts = []
+        for artifact in sorted(dep_job.attributes.get("release_artifacts")):
+            basename = os.path.basename(artifact)
+            if basename in SIGNING_FORMATS:
+                upstream_artifacts.append(
+                    {
+                        "taskId": {"task-reference": f"<{dep_kind}>"},
+                        "taskType": "repackage",
+                        "paths": [artifact],
+                        "formats": SIGNING_FORMATS[os.path.basename(artifact)],
+                    }
+                )
+
+        task = {
+            "label": label,
+            "description": description,
+            "worker-type": "linux-signing" if is_shippable else "linux-depsigning",
+            "worker": {
+                "implementation": "scriptworker-signing",
+                "upstream-artifacts": upstream_artifacts,
+                "max-run-time": 3600,
+            },
+            "scopes": scopes,
+            "dependencies": dependencies,
+            "attributes": attributes,
+            "run-on-projects": dep_job.attributes.get("run_on_projects"),
+            "optimization": dep_job.optimization,
+            "treeherder": treeherder,
+        }
+
+        yield task
diff --git a/taskcluster/gecko_taskgraph/transforms/repackage_signing_partner.py b/taskcluster/gecko_taskgraph/transforms/repackage_signing_partner.py
new file mode 100644
index 0000000000..eaf71f92a2
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/repackage_signing_partner.py
@@ -0,0 +1,145 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+Transform the repackage signing task into an actual task description.
+"""
+
+from taskgraph.transforms.base import TransformSequence
+from taskgraph.util.taskcluster import get_artifact_path
+from voluptuous import Optional
+
+from gecko_taskgraph.loader.single_dep import schema
+from gecko_taskgraph.transforms.task import task_description_schema
+from gecko_taskgraph.util.attributes import copy_attributes_from_dependent_job
+from gecko_taskgraph.util.partners import get_partner_config_by_kind
+from gecko_taskgraph.util.scriptworker import get_signing_cert_scope_per_platform
+
+transforms = TransformSequence()
+
+repackage_signing_description_schema = schema.extend(
+    {
+        Optional("label"): str,
+        Optional("extra"): object,
+        Optional("shipping-product"): task_description_schema["shipping-product"],
+        Optional("shipping-phase"): task_description_schema["shipping-phase"],
+        Optional("priority"): task_description_schema["priority"],
+    }
+)
+
+transforms.add_validate(repackage_signing_description_schema)
+
+
+@transforms.add
+def make_repackage_signing_description(config, jobs):
+    for job in jobs:
+        dep_job = job["primary-dependency"]
+        repack_id = dep_job.task["extra"]["repack_id"]
+        attributes = dep_job.attributes
+        build_platform = dep_job.attributes.get("build_platform")
+        is_shippable = dep_job.attributes.get("shippable")
+
+        # Mac & windows
+        label = dep_job.label.replace("repackage-", "repackage-signing-")
+        # Linux
+        label = label.replace("chunking-dummy-", "repackage-signing-")
+        description = "Signing of repackaged artifacts for partner repack id '{repack_id}' for build '" "{build_platform}/{build_type}'".format(  # NOQA: E501
+            repack_id=repack_id,
+            build_platform=attributes.get("build_platform"),
+            build_type=attributes.get("build_type"),
+        )
+
+        if "linux" in build_platform:
+            # we want the repack job, via the dependencies for the the chunking-dummy dep_job
+            for dep in dep_job.dependencies.values():
+                if dep.startswith("release-partner-repack"):
+                    dependencies = {"repack": dep}
+                    break
+        else:
+            # we have a genuine repackage job as our parent
+            dependencies = {"repackage": dep_job.label}
+
+        attributes = copy_attributes_from_dependent_job(dep_job)
+        attributes["repackage_type"] = "repackage-signing"
+
+        signing_cert_scope = get_signing_cert_scope_per_platform(
+            build_platform, is_shippable, config
+        )
+        scopes = [signing_cert_scope]
+
+        if "win" in build_platform:
+            upstream_artifacts = [
+                {
+                    "taskId": {"task-reference": "<repackage>"},
+                    "taskType": "repackage",
+                    "paths": [
+                        get_artifact_path(dep_job, f"{repack_id}/target.installer.exe"),
+                    ],
+                    "formats": ["autograph_authenticode_sha2", "autograph_gpg"],
+                }
+            ]
+
+            partner_config = get_partner_config_by_kind(config, config.kind)
+            partner, subpartner, _ = repack_id.split("/")
+            repack_stub_installer = partner_config[partner][subpartner].get(
+                "repack_stub_installer"
+            )
+            if build_platform.startswith("win32") and repack_stub_installer:
+                upstream_artifacts.append(
+                    {
+                        "taskId": {"task-reference": "<repackage>"},
+                        "taskType": "repackage",
+                        "paths": [
+                            get_artifact_path(
+                                dep_job,
+                                f"{repack_id}/target.stub-installer.exe",
+                            ),
+                        ],
+                        "formats": ["autograph_authenticode_sha2", "autograph_gpg"],
+                    }
+                )
+        elif "mac" in build_platform:
+            upstream_artifacts = [
+                {
+                    "taskId": {"task-reference": "<repackage>"},
+                    "taskType": "repackage",
+                    "paths": [
+                        get_artifact_path(dep_job, f"{repack_id}/target.dmg"),
+                    ],
+                    "formats": ["autograph_gpg"],
+                }
+            ]
+        elif "linux" in build_platform:
+            upstream_artifacts = [
+                {
+                    "taskId": {"task-reference": "<repack>"},
+                    "taskType": "repackage",
+                    "paths": [
+                        get_artifact_path(dep_job, f"{repack_id}/target.tar.bz2"),
+                    ],
+                    "formats": ["autograph_gpg"],
+                }
+            ]
+
+        task = {
+            "label": label,
+            "description": description,
+            "worker-type": "linux-signing",
+            "worker": {
+                "implementation": "scriptworker-signing",
+                "upstream-artifacts": upstream_artifacts,
+                "max-run-time": 3600,
+            },
+            "scopes": scopes,
+            "dependencies": dependencies,
+            "attributes": attributes,
+            "run-on-projects": dep_job.attributes.get("run_on_projects"),
+            "extra": {
+                "repack_id": repack_id,
+            },
+        }
+        # we may have reduced the priority for partner jobs, otherwise task.py will set it
+        if job.get("priority"):
+            task["priority"] = job["priority"]
+
+        yield task
diff --git a/taskcluster/gecko_taskgraph/transforms/repo_update.py b/taskcluster/gecko_taskgraph/transforms/repo_update.py
new file mode 100644
index 0000000000..f4f135b585
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/repo_update.py
@@ -0,0 +1,25 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+Transform the repo-update task into an actual task description.
+"""
+
+from taskgraph.transforms.base import TransformSequence
+from taskgraph.util.schema import resolve_keyed_by
+
+transforms = TransformSequence()
+
+
+@transforms.add
+def resolve_keys(config, tasks):
+    for task in tasks:
+        env = task["worker"].setdefault("env", {})
+        env["BRANCH"] = config.params["project"]
+        for envvar in env:
+            resolve_keyed_by(env, envvar, envvar, **config.params)
+
+        for envvar in list(env.keys()):
+            if not env.get(envvar):
+                del env[envvar]
+        yield task
diff --git a/taskcluster/gecko_taskgraph/transforms/reprocess_symbols.py b/taskcluster/gecko_taskgraph/transforms/reprocess_symbols.py
new file mode 100644
index 0000000000..5ad359bd5a
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/reprocess_symbols.py
@@ -0,0 +1,67 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+Transform the reprocess-symbols task description template,
+taskcluster/ci/reprocess-symbols/job-template.yml into an actual task description.
+"""
+
+
+import logging
+
+from taskgraph.transforms.base import TransformSequence
+from taskgraph.util.treeherder import inherit_treeherder_from_dep, join_symbol
+
+from gecko_taskgraph.util.attributes import copy_attributes_from_dependent_job
+
+logger = logging.getLogger(__name__)
+
+transforms = TransformSequence()
+
+
+@transforms.add
+def fill_template(config, tasks):
+    for task in tasks:
+        assert len(task["dependent-tasks"]) == 2
+
+        build_dep = task["primary-dependency"]
+        upload_dep = None
+        for dep_idx in task["dependent-tasks"]:
+            dep = task["dependent-tasks"][dep_idx]
+            if dep_idx != build_dep:
+                upload_dep = dep
+
+        task.pop("dependent-tasks", None)
+
+        # Fill out the dynamic fields in the task description
+        task["label"] = build_dep.label + "-reprocess-symbols"
+        task["dependencies"] = {"build": build_dep.label, "upload": upload_dep.label}
+        task["worker"]["env"]["GECKO_HEAD_REPOSITORY"] = config.params[
+            "head_repository"
+        ]
+        task["worker"]["env"]["GECKO_HEAD_REV"] = config.params["head_rev"]
+        task["worker"]["env"]["CRASHSTATS_SECRET"] = task["worker"]["env"][
+            "CRASHSTATS_SECRET"
+        ].format(level=config.params["level"])
+
+        attributes = copy_attributes_from_dependent_job(build_dep)
+        attributes.update(task.get("attributes", {}))
+        task["attributes"] = attributes
+
+        treeherder = inherit_treeherder_from_dep(task, build_dep)
+        th = build_dep.task.get("extra")["treeherder"]
+        th_symbol = th.get("symbol")
+        th_groupsymbol = th.get("groupSymbol", "?")
+
+        # Disambiguate the treeherder symbol.
+        sym = "Rep" + (th_symbol[1:] if th_symbol.startswith("B") else th_symbol)
+        treeherder.setdefault("symbol", join_symbol(th_groupsymbol, sym))
+        task["treeherder"] = treeherder
+
+        task["run-on-projects"] = build_dep.attributes.get("run_on_projects")
+        task["optimization"] = {"reprocess-symbols": None}
+        task["if-dependencies"] = ["build"]
+
+        del task["primary-dependency"]
+
+        yield task
diff --git a/taskcluster/gecko_taskgraph/transforms/reverse_chunk_deps.py b/taskcluster/gecko_taskgraph/transforms/reverse_chunk_deps.py
new file mode 100644
index 0000000000..ac2f282799
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/reverse_chunk_deps.py
@@ -0,0 +1,45 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+Adjust dependencies to not exceed MAX_DEPENDENCIES
+"""
+
+from taskgraph.transforms.base import TransformSequence
+from taskgraph.util.treeherder import add_suffix
+
+import gecko_taskgraph.transforms.release_deps as release_deps
+from gecko_taskgraph import MAX_DEPENDENCIES
+from gecko_taskgraph.util.copy_task import copy_task
+
+transforms = TransformSequence()
+
+
+def yield_job(orig_job, deps, count):
+    job = copy_task(orig_job)
+    job["dependencies"] = deps
+    job["name"] = "{}-{}".format(orig_job["name"], count)
+    if "treeherder" in job:
+        job["treeherder"]["symbol"] = add_suffix(
+            job["treeherder"]["symbol"], f"-{count}"
+        )
+
+    return job
+
+
+@transforms.add
+def add_dependencies(config, jobs):
+    for job in release_deps.add_dependencies(config, jobs):
+        count = 1
+        deps = {}
+
+        # sort for deterministic chunking
+        for dep_label in sorted(job["dependencies"].keys()):
+            deps[dep_label] = dep_label
+            if len(deps) == MAX_DEPENDENCIES:
+                yield yield_job(job, deps, count)
+                deps = {}
+                count += 1
+        if deps:
+            yield yield_job(job, deps, count)
+            count += 1
diff --git a/taskcluster/gecko_taskgraph/transforms/run_pgo_profile.py b/taskcluster/gecko_taskgraph/transforms/run_pgo_profile.py
new file mode 100644
index 0000000000..2585bdd712
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/run_pgo_profile.py
@@ -0,0 +1,34 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+Apply some defaults and minor modifications to the pgo jobs.
+"""
+
+import logging
+
+from taskgraph.transforms.base import TransformSequence
+
+logger = logging.getLogger(__name__)
+
+transforms = TransformSequence()
+
+
+@transforms.add
+def run_profile_data(config, jobs):
+    for job in jobs:
+        build_platform = job["attributes"].get("build_platform")
+        instr = "instrumented-build-{}".format(job["name"])
+        if "android" in build_platform:
+            artifact = "geckoview-test_runner.apk"
+        elif "macosx64" in build_platform:
+            artifact = "target.dmg"
+        elif "win" in build_platform:
+            artifact = "target.zip"
+        else:
+            artifact = "target.tar.bz2"
+        job.setdefault("fetches", {})[instr] = [
+            artifact,
+            "target.crashreporter-symbols.zip",
+        ]
+        yield job
diff --git a/taskcluster/gecko_taskgraph/transforms/scriptworker.py b/taskcluster/gecko_taskgraph/transforms/scriptworker.py
new file mode 100644
index 0000000000..5d382702af
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/scriptworker.py
@@ -0,0 +1,18 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+"""
+Transforms for adding appropriate scopes to scriptworker tasks.
+"""
+
+
+from gecko_taskgraph.util.scriptworker import get_balrog_server_scope
+
+
+def add_balrog_scopes(config, jobs):
+    for job in jobs:
+        server_scope = get_balrog_server_scope(config)
+        job["scopes"] = [server_scope]
+
+        yield job
diff --git a/taskcluster/gecko_taskgraph/transforms/scriptworker_canary.py b/taskcluster/gecko_taskgraph/transforms/scriptworker_canary.py
new file mode 100644
index 0000000000..43735f3dce
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/scriptworker_canary.py
@@ -0,0 +1,46 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+Build a command to run `mach release push-scriptworker-canaries`.
+"""
+
+
+from pipes import quote as shell_quote
+
+from mozrelease.scriptworker_canary import TASK_TYPES
+from taskgraph.transforms.base import TransformSequence
+
+transforms = TransformSequence()
+
+
+@transforms.add
+def build_command(config, jobs):
+    scriptworkers = config.params["try_task_config"].get(
+        "scriptworker-canary-workers", []
+    )
+    # Filter the list of workers to those we have configured a set of canary
+    # tasks for.
+    scriptworkers = [
+        scriptworker for scriptworker in scriptworkers if scriptworker in TASK_TYPES
+    ]
+
+    if not scriptworkers:
+        return
+
+    for job in jobs:
+
+        command = ["release", "push-scriptworker-canary"]
+        for scriptworker in scriptworkers:
+            command.extend(["--scriptworker", scriptworker])
+        for address in job.pop("addresses"):
+            command.extend(["--address", address])
+        if "ssh-key-secret" in job:
+            ssh_key_secret = job.pop("ssh-key-secret")
+            command.extend(["--ssh-key-secret", ssh_key_secret])
+            job.setdefault("scopes", []).append(f"secrets:get:{ssh_key_secret}")
+
+        job.setdefault("run", {}).update(
+            {"using": "mach", "mach": " ".join(map(shell_quote, command))}
+        )
+        yield job
diff --git a/taskcluster/gecko_taskgraph/transforms/sentry.py b/taskcluster/gecko_taskgraph/transforms/sentry.py
new file mode 100644
index 0000000000..2e43a15518
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/sentry.py
@@ -0,0 +1,30 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+from taskgraph.transforms.base import TransformSequence
+
+transforms = TransformSequence()
+
+
+@transforms.add
+def sentry(config, tasks):
+    """Do transforms specific to github-sync tasks."""
+    if config.params["project"] not in ["mozilla-central", "try"]:
+        return
+    for task in tasks:
+        scopes = [
+            scope.format(level=config.params["level"]) for scope in task["scopes"]
+        ]
+        task["scopes"] = scopes
+
+        env = {
+            key: value.format(
+                level=config.params["level"],
+                head_repository=config.params["head_repository"],
+                head_rev=config.params["head_rev"],
+            )
+            for (key, value) in task["worker"]["env"].items()
+        }
+        task["worker"]["env"] = env
+        yield task
diff --git a/taskcluster/gecko_taskgraph/transforms/shippable_l10n_signing.py b/taskcluster/gecko_taskgraph/transforms/shippable_l10n_signing.py
new file mode 100644
index 0000000000..324efa92dd
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/shippable_l10n_signing.py
@@ -0,0 +1,86 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+Transform the signing task into an actual task description.
+"""
+
+from taskgraph.transforms.base import TransformSequence
+from taskgraph.util.treeherder import join_symbol
+
+from gecko_taskgraph.util.attributes import copy_attributes_from_dependent_job
+from gecko_taskgraph.util.signed_artifacts import (
+    generate_specifications_of_artifacts_to_sign,
+)
+
+transforms = TransformSequence()
+
+
+@transforms.add
+def make_signing_description(config, jobs):
+    for job in jobs:
+        dep_job = job["primary-dependency"]
+        job["depname"] = dep_job.label
+
+        # add the chunk number to the TH symbol
+        symbol = job.get("treeherder", {}).get("symbol", "Bs")
+        symbol = "{}{}".format(symbol, dep_job.attributes.get("l10n_chunk"))
+        group = "L10n"
+
+        job["treeherder"] = {
+            "symbol": join_symbol(group, symbol),
+        }
+
+        yield job
+
+
+@transforms.add
+def define_upstream_artifacts(config, jobs):
+    for job in jobs:
+        dep_job = job["primary-dependency"]
+        upstream_artifact_task = job.pop("upstream-artifact-task", dep_job)
+
+        job["attributes"] = copy_attributes_from_dependent_job(dep_job)
+        if dep_job.attributes.get("chunk_locales"):
+            # Used for l10n attribute passthrough
+            job["attributes"]["chunk_locales"] = dep_job.attributes.get("chunk_locales")
+
+        locale_specifications = generate_specifications_of_artifacts_to_sign(
+            config,
+            job,
+            keep_locale_template=True,
+            dep_kind=upstream_artifact_task.kind,
+        )
+
+        upstream_artifacts = []
+        for spec in locale_specifications:
+            upstream_task_type = "l10n"
+            if upstream_artifact_task.kind.endswith(
+                ("-mac-notarization", "-mac-signing")
+            ):
+                # Upstream is mac signing or notarization
+                upstream_task_type = "scriptworker"
+            upstream_artifacts.append(
+                {
+                    "taskId": {"task-reference": f"<{upstream_artifact_task.kind}>"},
+                    "taskType": upstream_task_type,
+                    # Set paths based on artifacts in the specs (above) one per
+                    # locale present in the chunk this is signing stuff for.
+                    # Pass paths through set and sorted() so we get a list back
+                    # and we remove any duplicates (e.g. hardcoded ja-JP-mac langpack)
+                    "paths": sorted(
+                        {
+                            path_template.format(locale=locale)
+                            for locale in upstream_artifact_task.attributes.get(
+                                "chunk_locales", []
+                            )
+                            for path_template in spec["artifacts"]
+                        }
+                    ),
+                    "formats": spec["formats"],
+                }
+            )
+
+        job["upstream-artifacts"] = upstream_artifacts
+
+        yield job
diff --git a/taskcluster/gecko_taskgraph/transforms/signing.py b/taskcluster/gecko_taskgraph/transforms/signing.py
new file mode 100644
index 0000000000..9a5873fc81
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/signing.py
@@ -0,0 +1,266 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+Transform the signing task into an actual task description.
+"""
+
+from taskgraph.transforms.base import TransformSequence
+from taskgraph.util.keyed_by import evaluate_keyed_by
+from taskgraph.util.schema import taskref_or_string
+from voluptuous import Optional, Required
+
+from gecko_taskgraph.loader.single_dep import schema
+from gecko_taskgraph.transforms.task import task_description_schema
+from gecko_taskgraph.util.attributes import (
+    copy_attributes_from_dependent_job,
+    release_level,
+)
+from gecko_taskgraph.util.scriptworker import (
+    add_scope_prefix,
+    get_signing_cert_scope_per_platform,
+)
+
+transforms = TransformSequence()
+
+signing_description_schema = schema.extend(
+    {
+        # Artifacts from dep task to sign - Sync with taskgraph/transforms/task.py
+        # because this is passed directly into the signingscript worker
+        Required("upstream-artifacts"): [
+            {
+                # taskId of the task with the artifact
+                Required("taskId"): taskref_or_string,
+                # type of signing task (for CoT)
+                Required("taskType"): str,
+                # Paths to the artifacts to sign
+                Required("paths"): [str],
+                # Signing formats to use on each of the paths
+                Required("formats"): [str],
+            }
+        ],
+        # depname is used in taskref's to identify the taskID of the unsigned things
+        Required("depname"): str,
+        # attributes for this task
+        Optional("attributes"): {str: object},
+        # unique label to describe this signing task, defaults to {dep.label}-signing
+        Optional("label"): str,
+        # treeherder is allowed here to override any defaults we use for signing.  See
+        # taskcluster/gecko_taskgraph/transforms/task.py for the schema details, and the
+        # below transforms for defaults of various values.
+        Optional("treeherder"): task_description_schema["treeherder"],
+        # Routes specific to this task, if defined
+        Optional("routes"): [str],
+        Optional("shipping-phase"): task_description_schema["shipping-phase"],
+        Optional("shipping-product"): task_description_schema["shipping-product"],
+        Optional("dependent-tasks"): {str: object},
+        # Optional control for how long a task may run (aka maxRunTime)
+        Optional("max-run-time"): int,
+        Optional("extra"): {str: object},
+        # Max number of partner repacks per chunk
+        Optional("repacks-per-chunk"): int,
+        # Override the default priority for the project
+        Optional("priority"): task_description_schema["priority"],
+    }
+)
+
+
+@transforms.add
+def set_defaults(config, jobs):
+    for job in jobs:
+        if not job.get("depname"):
+            dep_job = job["primary-dependency"]
+            job["depname"] = dep_job.kind
+        yield job
+
+
+transforms.add_validate(signing_description_schema)
+
+
+@transforms.add
+def add_entitlements_link(config, jobs):
+    for job in jobs:
+        entitlements_path = evaluate_keyed_by(
+            config.graph_config["mac-notarization"]["mac-entitlements"],
+            "mac entitlements",
+            {
+                "platform": job["primary-dependency"].attributes.get("build_platform"),
+                "release-level": release_level(config.params["project"]),
+            },
+        )
+        if entitlements_path:
+            job["entitlements-url"] = config.params.file_url(
+                entitlements_path,
+            )
+        yield job
+
+
+@transforms.add
+def add_requirements_link(config, jobs):
+    for job in jobs:
+        requirements_path = evaluate_keyed_by(
+            config.graph_config["mac-notarization"]["mac-requirements"],
+            "mac requirements",
+            {
+                "platform": job["primary-dependency"].attributes.get("build_platform"),
+            },
+        )
+        if requirements_path:
+            job["requirements-plist-url"] = config.params.file_url(
+                requirements_path,
+            )
+        yield job
+
+
+@transforms.add
+def make_task_description(config, jobs):
+    for job in jobs:
+        dep_job = job["primary-dependency"]
+        attributes = dep_job.attributes
+
+        signing_format_scopes = []
+        formats = set()
+        for artifacts in job["upstream-artifacts"]:
+            for f in artifacts["formats"]:
+                formats.add(f)  # Add each format only once
+
+        is_shippable = dep_job.attributes.get("shippable", False)
+        build_platform = dep_job.attributes.get("build_platform")
+        treeherder = None
+        if "partner" not in config.kind and "eme-free" not in config.kind:
+            treeherder = job.get("treeherder", {})
+
+            dep_th_platform = (
+                dep_job.task.get("extra", {})
+                .get("treeherder", {})
+                .get("machine", {})
+                .get("platform", "")
+            )
+            build_type = dep_job.attributes.get("build_type")
+            treeherder.setdefault(
+                "platform",
+                _generate_treeherder_platform(
+                    dep_th_platform, build_platform, build_type
+                ),
+            )
+
+            # ccov builds are tier 2, so they cannot have tier 1 tasks
+            # depending on them.
+            treeherder.setdefault(
+                "tier",
+                dep_job.task.get("extra", {}).get("treeherder", {}).get("tier", 1),
+            )
+            treeherder.setdefault(
+                "symbol",
+                _generate_treeherder_symbol(
+                    dep_job.task.get("extra", {}).get("treeherder", {}).get("symbol")
+                ),
+            )
+            treeherder.setdefault("kind", "build")
+
+        label = job["label"]
+        description = (
+            "Initial Signing for locale '{locale}' for build '"
+            "{build_platform}/{build_type}'".format(
+                locale=attributes.get("locale", "en-US"),
+                build_platform=build_platform,
+                build_type=attributes.get("build_type"),
+            )
+        )
+
+        attributes = (
+            job["attributes"]
+            if job.get("attributes")
+            else copy_attributes_from_dependent_job(dep_job)
+        )
+        attributes["signed"] = True
+
+        if "linux" in build_platform:
+            attributes["release_artifacts"] = ["public/build/KEY"]
+
+        if dep_job.attributes.get("chunk_locales"):
+            # Used for l10n attribute passthrough
+            attributes["chunk_locales"] = dep_job.attributes.get("chunk_locales")
+
+        signing_cert_scope = get_signing_cert_scope_per_platform(
+            build_platform, is_shippable, config
+        )
+        worker_type_alias = "linux-signing" if is_shippable else "linux-depsigning"
+        task = {
+            "label": label,
+            "description": description,
+            "worker": {
+                "implementation": "scriptworker-signing",
+                "upstream-artifacts": job["upstream-artifacts"],
+                "max-run-time": job.get("max-run-time", 3600),
+            },
+            "scopes": [signing_cert_scope] + signing_format_scopes,
+            "dependencies": _generate_dependencies(job),
+            "attributes": attributes,
+            "run-on-projects": dep_job.attributes.get("run_on_projects"),
+            "optimization": dep_job.optimization,
+            "routes": job.get("routes", []),
+            "shipping-product": job.get("shipping-product"),
+            "shipping-phase": job.get("shipping-phase"),
+        }
+        if dep_job.kind in task["dependencies"]:
+            task["if-dependencies"] = [dep_job.kind]
+
+        # build-mac-{signing,notarization} uses signingscript instead of iscript
+        if "macosx" in build_platform and config.kind.endswith("-mac-notarization"):
+            task["worker"]["mac-behavior"] = "apple_notarization"
+            task["scopes"] = [
+                add_scope_prefix(config, "signing:cert:release-apple-notarization")
+            ]
+        elif "macosx" in build_platform:
+            # iscript overrides
+            task["worker"]["mac-behavior"] = "mac_sign_and_pkg"
+
+            worker_type_alias_map = {
+                "linux-depsigning": "mac-depsigning",
+                "linux-signing": "mac-signing",
+            }
+            assert worker_type_alias in worker_type_alias_map, (
+                "Make sure to adjust the below worker_type_alias logic for "
+                "mac if you change the signing workerType aliases!"
+                " ({} not found in mapping)".format(worker_type_alias)
+            )
+            worker_type_alias = worker_type_alias_map[worker_type_alias]
+            for attr in ("entitlements-url", "requirements-plist-url"):
+                if job.get(attr):
+                    task["worker"][attr] = job[attr]
+
+        task["worker-type"] = worker_type_alias
+        if treeherder:
+            task["treeherder"] = treeherder
+        if job.get("extra"):
+            task["extra"] = job["extra"]
+        # we may have reduced the priority for partner jobs, otherwise task.py will set it
+        if job.get("priority"):
+            task["priority"] = job["priority"]
+
+        yield task
+
+
+def _generate_dependencies(job):
+    if isinstance(job.get("dependent-tasks"), dict):
+        deps = {}
+        for k, v in job["dependent-tasks"].items():
+            deps[k] = v.label
+        return deps
+    return {job["depname"]: job["primary-dependency"].label}
+
+
+def _generate_treeherder_platform(dep_th_platform, build_platform, build_type):
+    if "-pgo" in build_platform:
+        actual_build_type = "pgo"
+    elif "-ccov" in build_platform:
+        actual_build_type = "ccov"
+    else:
+        actual_build_type = build_type
+    return f"{dep_th_platform}/{actual_build_type}"
+
+
+def _generate_treeherder_symbol(build_symbol):
+    symbol = build_symbol + "s"
+    return symbol
diff --git a/taskcluster/gecko_taskgraph/transforms/source_checksums_signing.py b/taskcluster/gecko_taskgraph/transforms/source_checksums_signing.py
new file mode 100644
index 0000000000..60c5f30ed3
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/source_checksums_signing.py
@@ -0,0 +1,83 @@
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+Transform the checksums signing task into an actual task description.
+"""
+
+from taskgraph.transforms.base import TransformSequence
+from voluptuous import Optional
+
+from gecko_taskgraph.loader.single_dep import schema
+from gecko_taskgraph.transforms.task import task_description_schema
+from gecko_taskgraph.util.attributes import copy_attributes_from_dependent_job
+from gecko_taskgraph.util.scriptworker import get_signing_cert_scope
+
+checksums_signing_description_schema = schema.extend(
+    {
+        Optional("label"): str,
+        Optional("treeherder"): task_description_schema["treeherder"],
+        Optional("shipping-product"): task_description_schema["shipping-product"],
+        Optional("shipping-phase"): task_description_schema["shipping-phase"],
+    }
+)
+
+transforms = TransformSequence()
+transforms.add_validate(checksums_signing_description_schema)
+
+
+@transforms.add
+def make_checksums_signing_description(config, jobs):
+    for job in jobs:
+        dep_job = job["primary-dependency"]
+        attributes = dep_job.attributes
+
+        treeherder = job.get("treeherder", {})
+        treeherder.setdefault("symbol", "css(N)")
+        dep_th_platform = (
+            dep_job.task.get("extra", {})
+            .get("treeherder", {})
+            .get("machine", {})
+            .get("platform", "")
+        )
+        treeherder.setdefault("platform", f"{dep_th_platform}/opt")
+        treeherder.setdefault("tier", 1)
+        treeherder.setdefault("kind", "build")
+
+        label = job["label"]
+        description = "Signing of release-source checksums file"
+        dependencies = {"beetmover": dep_job.label}
+
+        attributes = copy_attributes_from_dependent_job(dep_job)
+
+        upstream_artifacts = [
+            {
+                "taskId": {"task-reference": "<beetmover>"},
+                "taskType": "beetmover",
+                "paths": [
+                    "public/target-source.checksums",
+                ],
+                "formats": ["autograph_gpg"],
+            }
+        ]
+
+        signing_cert_scope = get_signing_cert_scope(config)
+
+        task = {
+            "label": label,
+            "description": description,
+            "worker-type": "linux-signing",
+            "worker": {
+                "implementation": "scriptworker-signing",
+                "upstream-artifacts": upstream_artifacts,
+                "max-run-time": 3600,
+            },
+            "scopes": [
+                signing_cert_scope,
+            ],
+            "dependencies": dependencies,
+            "attributes": attributes,
+            "run-on-projects": dep_job.attributes.get("run_on_projects"),
+            "treeherder": treeherder,
+        }
+
+        yield task
diff --git a/taskcluster/gecko_taskgraph/transforms/source_test.py b/taskcluster/gecko_taskgraph/transforms/source_test.py
new file mode 100644
index 0000000000..b480fcad02
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/source_test.py
@@ -0,0 +1,270 @@
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+Source-test jobs can run on multiple platforms.  These transforms allow jobs
+with either `platform` or a list of `platforms`, and set the appropriate
+treeherder configuration and attributes for that platform.
+"""
+
+
+import copy
+import os
+
+import taskgraph
+from taskgraph.transforms.base import TransformSequence
+from taskgraph.util.attributes import keymatch
+from taskgraph.util.schema import Schema, optionally_keyed_by, resolve_keyed_by
+from taskgraph.util.treeherder import join_symbol, split_symbol
+from voluptuous import Any, Extra, Optional, Required
+
+from gecko_taskgraph.transforms.job import job_description_schema
+from gecko_taskgraph.util.hg import get_json_automationrelevance
+
+source_test_description_schema = Schema(
+    {
+        # most fields are passed directly through as job fields, and are not
+        # repeated here
+        Extra: object,
+        # The platform on which this task runs.  This will be used to set up attributes
+        # (for try selection) and treeherder metadata (for display).  If given as a list,
+        # the job will be "split" into multiple tasks, one with each platform.
+        Required("platform"): Any(str, [str]),
+        # Build labels required for the task. If this key is provided it must
+        # contain a build label for the task platform.
+        # The task will then depend on a build task, and the installer url will be
+        # saved to the GECKO_INSTALLER_URL environment variable.
+        Optional("require-build"): optionally_keyed_by("project", {str: str}),
+        # These fields can be keyed by "platform", and are otherwise identical to
+        # job descriptions.
+        Required("worker-type"): optionally_keyed_by(
+            "platform", job_description_schema["worker-type"]
+        ),
+        Required("worker"): optionally_keyed_by(
+            "platform", job_description_schema["worker"]
+        ),
+        Optional("python-version"): [int],
+        Optional("dependencies"): {
+            k: optionally_keyed_by("platform", v)
+            for k, v in job_description_schema["dependencies"].items()
+        },
+        # A list of artifacts to install from 'fetch' tasks.
+        Optional("fetches"): {
+            str: optionally_keyed_by(
+                "platform", job_description_schema["fetches"][str]
+            ),
+        },
+    }
+)
+
+transforms = TransformSequence()
+
+transforms.add_validate(source_test_description_schema)
+
+
+@transforms.add
+def set_job_name(config, jobs):
+    for job in jobs:
+        if "job-from" in job and job["job-from"] != "kind.yml":
+            from_name = os.path.splitext(job["job-from"])[0]
+            job["name"] = "{}-{}".format(from_name, job["name"])
+        yield job
+
+
+@transforms.add
+def expand_platforms(config, jobs):
+    for job in jobs:
+        if isinstance(job["platform"], str):
+            yield job
+            continue
+
+        for platform in job["platform"]:
+            pjob = copy.deepcopy(job)
+            pjob["platform"] = platform
+
+            if "name" in pjob:
+                pjob["name"] = "{}-{}".format(pjob["name"], platform)
+            else:
+                pjob["label"] = "{}-{}".format(pjob["label"], platform)
+            yield pjob
+
+
+@transforms.add
+def split_python(config, jobs):
+    for job in jobs:
+        key = "python-version"
+        versions = job.pop(key, [])
+        if not versions:
+            yield job
+            continue
+        for version in versions:
+            group = f"py{version}"
+            pyjob = copy.deepcopy(job)
+            if "name" in pyjob:
+                pyjob["name"] += f"-{group}"
+            else:
+                pyjob["label"] += f"-{group}"
+            symbol = split_symbol(pyjob["treeherder"]["symbol"])[1]
+            pyjob["treeherder"]["symbol"] = join_symbol(group, symbol)
+            pyjob["run"][key] = version
+            yield pyjob
+
+
+@transforms.add
+def split_jsshell(config, jobs):
+    all_shells = {"sm": "Spidermonkey", "v8": "Google V8"}
+
+    for job in jobs:
+        if not job["name"].startswith("jsshell"):
+            yield job
+            continue
+
+        test = job.pop("test")
+        for shell in job.get("shell", all_shells.keys()):
+            assert shell in all_shells
+
+            new_job = copy.deepcopy(job)
+            new_job["name"] = "{}-{}".format(new_job["name"], shell)
+            new_job["description"] = "{} on {}".format(
+                new_job["description"], all_shells[shell]
+            )
+            new_job["shell"] = shell
+
+            group = f"js-bench-{shell}"
+            symbol = split_symbol(new_job["treeherder"]["symbol"])[1]
+            new_job["treeherder"]["symbol"] = join_symbol(group, symbol)
+
+            run = new_job["run"]
+            run["mach"] = run["mach"].format(
+                shell=shell, SHELL=shell.upper(), test=test
+            )
+            yield new_job
+
+
+def add_build_dependency(config, job):
+    """
+    Add build dependency to the job and installer_url to env.
+    """
+    key = job["platform"]
+    build_labels = job.pop("require-build", {})
+    matches = keymatch(build_labels, key)
+    if not matches:
+        raise Exception(
+            "No build platform found. "
+            "Define 'require-build' for {} in the task config.".format(key)
+        )
+
+    if len(matches) > 1:
+        raise Exception(f"More than one build platform found for '{key}'.")
+
+    label = matches[0]
+    deps = job.setdefault("dependencies", {})
+    deps.update({"build": label})
+
+
+@transforms.add
+def handle_platform(config, jobs):
+    """
+    Handle the 'platform' property, setting up treeherder context as well as
+    try-related attributes.
+    """
+    fields = [
+        "always-target",
+        "fetches.toolchain",
+        "require-build",
+        "worker-type",
+        "worker",
+    ]
+
+    for job in jobs:
+        platform = job["platform"]
+
+        for field in fields:
+            resolve_keyed_by(
+                job, field, item_name=job["name"], project=config.params["project"]
+            )
+        for field in job.get("dependencies", {}):
+            resolve_keyed_by(
+                job,
+                f"dependencies.{field}",
+                item_name=job["name"],
+                project=config.params["project"],
+            )
+
+        if "treeherder" in job:
+            job["treeherder"].setdefault("platform", platform)
+
+        if "require-build" in job:
+            add_build_dependency(config, job)
+
+        del job["platform"]
+        yield job
+
+
+@transforms.add
+def handle_shell(config, jobs):
+    """
+    Handle the 'shell' property.
+    """
+    fields = [
+        "run-on-projects",
+        "worker.env",
+    ]
+
+    for job in jobs:
+        if not job.get("shell"):
+            yield job
+            continue
+
+        for field in fields:
+            resolve_keyed_by(job, field, item_name=job["name"])
+
+        del job["shell"]
+        yield job
+
+
+@transforms.add
+def set_code_review_env(config, jobs):
+    """
+    Add a CODE_REVIEW environment variable when running in code-review bot mode
+    """
+    is_code_review = config.params["target_tasks_method"] == "codereview"
+
+    for job in jobs:
+        attrs = job.get("attributes", {})
+        if is_code_review and attrs.get("code-review") is True:
+            env = job["worker"].setdefault("env", {})
+            env["CODE_REVIEW"] = "1"
+
+        yield job
+
+
+@transforms.add
+def set_base_revision_in_tgdiff(config, jobs):
+    # Don't attempt to download 'json-automation' locally as the revision may
+    # not exist in the repository.
+    if not os.environ.get("MOZ_AUTOMATION") or taskgraph.fast:
+        yield from jobs
+        return
+
+    data = get_json_automationrelevance(
+        config.params["head_repository"], config.params["head_rev"]
+    )
+    for job in jobs:
+        if job["name"] != "taskgraph-diff":
+            yield job
+            continue
+
+        job["run"]["command-context"] = {
+            "base_rev": data["changesets"][0]["parents"][0]
+        }
+        yield job
+
+
+@transforms.add
+def set_worker_exit_code(config, jobs):
+    for job in jobs:
+        worker = job["worker"]
+        worker.setdefault("retry-exit-status", [])
+        if 137 not in worker["retry-exit-status"]:
+            worker["retry-exit-status"].append(137)
+        yield job
diff --git a/taskcluster/gecko_taskgraph/transforms/spidermonkey.py b/taskcluster/gecko_taskgraph/transforms/spidermonkey.py
new file mode 100644
index 0000000000..8e652f1668
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/spidermonkey.py
@@ -0,0 +1,21 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+import copy
+
+from taskgraph.transforms.base import TransformSequence
+from taskgraph.util.schema import resolve_keyed_by
+
+transforms = TransformSequence()
+
+
+@transforms.add
+def handle_keyed_by(config, jobs):
+    """Resolve fields that can be keyed by platform, etc."""
+    fields = ["fetches.toolchain"]
+    for job in jobs:
+        job = copy.deepcopy(job)  # don't overwrite dict values here
+        for field in fields:
+            resolve_keyed_by(item=job, field=field, item_name=job["name"])
+
+        yield job
diff --git a/taskcluster/gecko_taskgraph/transforms/split_by_locale.py b/taskcluster/gecko_taskgraph/transforms/split_by_locale.py
new file mode 100644
index 0000000000..ae68ab5051
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/split_by_locale.py
@@ -0,0 +1,79 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+This transform splits the jobs it receives into per-locale tasks. Locales are
+provided by the `locales-file`.
+"""
+
+from copy import deepcopy
+from pprint import pprint
+
+from taskgraph.transforms.base import TransformSequence
+from taskgraph.util.schema import Schema
+from voluptuous import Extra, Optional, Required
+
+from gecko_taskgraph.transforms.l10n import parse_locales_file
+
+transforms = TransformSequence()
+
+split_by_locale_schema = Schema(
+    {
+        # The file to pull locale information from. This should be a json file
+        # such as browser/locales/l10n-changesets.json.
+        Required("locales-file"): str,
+        # The platform name in the form used by the locales files. Defaults to
+        # attributes.build_platform if not provided.
+        Optional("locale-file-platform"): str,
+        # A list of properties elsewhere in the job that need to have the locale
+        # name substituted into them. The referenced properties may be strings
+        # or lists. In the case of the latter, all list values will have
+        # substitutions performed.
+        Optional("properties-with-locale"): [str],
+        Extra: object,
+    }
+)
+
+
+transforms.add_validate(split_by_locale_schema)
+
+
+@transforms.add
+def add_command(config, jobs):
+    for job in jobs:
+        locales_file = job.pop("locales-file")
+        properties_with_locale = job.pop("properties-with-locale")
+        build_platform = job.pop(
+            "locale-file-platform", job["attributes"]["build_platform"]
+        )
+
+        for locale in parse_locales_file(locales_file, build_platform):
+            locale_job = deepcopy(job)
+            locale_job["attributes"]["locale"] = locale
+            for prop in properties_with_locale:
+                container, subfield = locale_job, prop
+                while "." in subfield:
+                    f, subfield = subfield.split(".", 1)
+                    if f not in container:
+                        raise Exception(
+                            f"Unable to find property {prop} to perform locale substitution on. Job is:\n{pprint(job)}"
+                        )
+                    container = container[f]
+                    if not isinstance(container, dict):
+                        raise Exception(
+                            f"{container} is not a dict, cannot perform locale substitution. Job is:\n{pprint(job)}"
+                        )
+
+                if isinstance(container[subfield], str):
+                    container[subfield] = container[subfield].format(locale=locale)
+                elif isinstance(container[subfield], list):
+                    for i in range(len(container[subfield])):
+                        container[subfield][i] = container[subfield][i].format(
+                            locale=locale
+                        )
+                else:
+                    raise Exception(
+                        f"Don't know how to subtitute locale for value of type: {type(container[subfield])}; value is: {container[subfield]}"
+                    )
+
+            yield locale_job
diff --git a/taskcluster/gecko_taskgraph/transforms/startup_test.py b/taskcluster/gecko_taskgraph/transforms/startup_test.py
new file mode 100644
index 0000000000..2660ef6e93
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/startup_test.py
@@ -0,0 +1,40 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+
+from taskgraph.transforms.base import TransformSequence
+
+transforms = TransformSequence()
+
+
+@transforms.add
+def add_command(config, jobs):
+    for job in jobs:
+        extra_config = job.pop("extra-config")
+        upstream_kind = extra_config["upstream_kind"]
+        upstream_artifact = extra_config["upstream_artifact"]
+        binary = extra_config["binary"]
+        package_to_test = "<{}/public/build/{}>".format(
+            upstream_kind, upstream_artifact
+        )
+
+        if job["attributes"]["build_platform"].startswith("linux"):
+            job["run"]["command"] = {
+                "artifact-reference": ". $HOME/scripts/xvfb.sh && start_xvfb '1600x1200x24' 0 && "
+                + "python3 ./mach python testing/mozharness/scripts/does_it_crash.py "
+                + "--run-for 30 --thing-url "
+                + package_to_test
+                + " --thing-to-run "
+                + binary
+            }
+        else:
+            job["run"]["mach"] = {
+                "artifact-reference": "python testing/mozharness/scripts/does_it_crash.py "
+                + "--run-for 30 --thing-url "
+                + package_to_test
+                + " --thing-to-run "
+                + binary
+            }
+
+        yield job
diff --git a/taskcluster/gecko_taskgraph/transforms/strip_dependent_task.py b/taskcluster/gecko_taskgraph/transforms/strip_dependent_task.py
new file mode 100644
index 0000000000..4e1ec8783a
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/strip_dependent_task.py
@@ -0,0 +1,17 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+FIXME
+"""
+
+from taskgraph.transforms.base import TransformSequence
+
+transforms = TransformSequence()
+
+
+@transforms.add
+def strip_dependent_task(config, jobs):
+    for job in jobs:
+        del job["primary-dependency"]
+        yield job
diff --git a/taskcluster/gecko_taskgraph/transforms/task.py b/taskcluster/gecko_taskgraph/transforms/task.py
new file mode 100644
index 0000000000..e823e96b21
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/task.py
@@ -0,0 +1,2266 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+These transformations take a task description and turn it into a TaskCluster
+task definition (along with attributes, label, etc.).  The input to these
+transformations is generic to any kind of task, but abstracts away some of the
+complexities of worker implementations, scopes, and treeherder annotations.
+"""
+
+
+import datetime
+import hashlib
+import os
+import re
+import time
+
+import attr
+from mozbuild.util import memoize
+from taskcluster.utils import fromNow
+from taskgraph.transforms.base import TransformSequence
+from taskgraph.util.keyed_by import evaluate_keyed_by
+from taskgraph.util.schema import (
+    Schema,
+    optionally_keyed_by,
+    resolve_keyed_by,
+    taskref_or_string,
+    validate_schema,
+)
+from taskgraph.util.treeherder import split_symbol
+from voluptuous import All, Any, Extra, Match, NotIn, Optional, Required
+
+from gecko_taskgraph import GECKO, MAX_DEPENDENCIES
+from gecko_taskgraph.optimize.schema import OptimizationSchema
+from gecko_taskgraph.transforms.job.common import get_expiration
+from gecko_taskgraph.util import docker as dockerutil
+from gecko_taskgraph.util.attributes import TRUNK_PROJECTS, is_try, release_level
+from gecko_taskgraph.util.copy_task import copy_task
+from gecko_taskgraph.util.hash import hash_path
+from gecko_taskgraph.util.partners import get_partners_to_be_published
+from gecko_taskgraph.util.scriptworker import BALROG_ACTIONS, get_release_config
+from gecko_taskgraph.util.signed_artifacts import get_signed_artifacts
+from gecko_taskgraph.util.workertypes import get_worker_type, worker_type_implementation
+
+RUN_TASK = os.path.join(GECKO, "taskcluster", "scripts", "run-task")
+
+SCCACHE_GCS_PROJECT = "sccache-3"
+
+
+@memoize
+def _run_task_suffix():
+    """String to append to cache names under control of run-task."""
+    return hash_path(RUN_TASK)[0:20]
+
+
+def _compute_geckoview_version(app_version, moz_build_date):
+    """Geckoview version string that matches geckoview gradle configuration"""
+    # Must be synchronized with /mobile/android/geckoview/build.gradle computeVersionCode(...)
+    version_without_milestone = re.sub(r"a[0-9]", "", app_version, 1)
+    parts = version_without_milestone.split(".")
+    return f"{parts[0]}.{parts[1]}.{moz_build_date}"
+
+
+# A task description is a general description of a TaskCluster task
+task_description_schema = Schema(
+    {
+        # the label for this task
+        Required("label"): str,
+        # description of the task (for metadata)
+        Required("description"): str,
+        # attributes for this task
+        Optional("attributes"): {str: object},
+        # relative path (from config.path) to the file task was defined in
+        Optional("job-from"): str,
+        # dependencies of this task, keyed by name; these are passed through
+        # verbatim and subject to the interpretation of the Task's get_dependencies
+        # method.
+        Optional("dependencies"): {
+            All(
+                str,
+                NotIn(
+                    ["self", "decision"],
+                    "Can't use 'self` or 'decision' as depdency names.",
+                ),
+            ): object,
+        },
+        # Soft dependencies of this task, as a list of tasks labels
+        Optional("soft-dependencies"): [str],
+        # Dependencies that must be scheduled in order for this task to run.
+        Optional("if-dependencies"): [str],
+        Optional("requires"): Any("all-completed", "all-resolved"),
+        # expiration and deadline times, relative to task creation, with units
+        # (e.g., "14 days").  Defaults are set based on the project.
+        Optional("expires-after"): str,
+        Optional("deadline-after"): str,
+        Optional("expiration-policy"): str,
+        # custom routes for this task; the default treeherder routes will be added
+        # automatically
+        Optional("routes"): [str],
+        # custom scopes for this task; any scopes required for the worker will be
+        # added automatically. The following parameters will be substituted in each
+        # scope:
+        #  {level} -- the scm level of this push
+        #  {project} -- the project of this push
+        Optional("scopes"): [str],
+        # Tags
+        Optional("tags"): {str: str},
+        # custom "task.extra" content
+        Optional("extra"): {str: object},
+        # treeherder-related information; see
+        # https://firefox-ci-tc.services.mozilla.com/schemas/taskcluster-treeherder/v1/task-treeherder-config.json
+        # If not specified, no treeherder extra information or routes will be
+        # added to the task
+        Optional("treeherder"): {
+            # either a bare symbol, or "grp(sym)".
+            "symbol": str,
+            # the job kind
+            "kind": Any("build", "test", "other"),
+            # tier for this task
+            "tier": int,
+            # task platform, in the form platform/collection, used to set
+            # treeherder.machine.platform and treeherder.collection or
+            # treeherder.labels
+            "platform": Match("^[A-Za-z0-9_-]{1,50}/[A-Za-z0-9_-]{1,50}$"),
+        },
+        # information for indexing this build so its artifacts can be discovered;
+        # if omitted, the build will not be indexed.
+        Optional("index"): {
+            # the name of the product this build produces
+            "product": str,
+            # the names to use for this job in the TaskCluster index
+            "job-name": str,
+            # Type of gecko v2 index to use
+            "type": Any(
+                "generic",
+                "l10n",
+                "shippable",
+                "shippable-l10n",
+                "android-shippable",
+                "android-shippable-with-multi-l10n",
+                "shippable-with-multi-l10n",
+            ),
+            # The rank that the task will receive in the TaskCluster
+            # index.  A newly completed task supercedes the currently
+            # indexed task iff it has a higher rank.  If unspecified,
+            # 'by-tier' behavior will be used.
+            "rank": Any(
+                # Rank is equal the timestamp of the build_date for tier-1
+                # tasks, and zero for non-tier-1.  This sorts tier-{2,3}
+                # builds below tier-1 in the index.
+                "by-tier",
+                # Rank is given as an integer constant (e.g. zero to make
+                # sure a task is last in the index).
+                int,
+                # Rank is equal to the timestamp of the build_date.  This
+                # option can be used to override the 'by-tier' behavior
+                # for non-tier-1 tasks.
+                "build_date",
+            ),
+        },
+        # The `run_on_projects` attribute, defaulting to "all".  This dictates the
+        # projects on which this task should be included in the target task set.
+        # See the attributes documentation for details.
+        Optional("run-on-projects"): optionally_keyed_by("build-platform", [str]),
+        # Like `run_on_projects`, `run-on-hg-branches` defaults to "all".
+        Optional("run-on-hg-branches"): optionally_keyed_by("project", [str]),
+        # The `shipping_phase` attribute, defaulting to None. This specifies the
+        # release promotion phase that this task belongs to.
+        Required("shipping-phase"): Any(
+            None,
+            "build",
+            "promote",
+            "push",
+            "ship",
+        ),
+        # The `shipping_product` attribute, defaulting to None. This specifies the
+        # release promotion product that this task belongs to.
+        Required("shipping-product"): Any(None, str),
+        # The `always-target` attribute will cause the task to be included in the
+        # target_task_graph regardless of filtering. Tasks included in this manner
+        # will be candidates for optimization even when `optimize_target_tasks` is
+        # False, unless the task was also explicitly chosen by the target_tasks
+        # method.
+        Required("always-target"): bool,
+        # Optimization to perform on this task during the optimization phase.
+        # Optimizations are defined in taskcluster/gecko_taskgraph/optimize.py.
+        Required("optimization"): OptimizationSchema,
+        # the provisioner-id/worker-type for the task.  The following parameters will
+        # be substituted in this string:
+        #  {level} -- the scm level of this push
+        "worker-type": str,
+        # Whether the job should use sccache compiler caching.
+        Required("use-sccache"): bool,
+        # information specific to the worker implementation that will run this task
+        Optional("worker"): {
+            Required("implementation"): str,
+            Extra: object,
+        },
+        # Override the default priority for the project
+        Optional("priority"): str,
+    }
+)
+
+TC_TREEHERDER_SCHEMA_URL = (
+    "https://github.com/taskcluster/taskcluster-treeherder/"
+    "blob/master/schemas/task-treeherder-config.yml"
+)
+
+
+UNKNOWN_GROUP_NAME = (
+    "Treeherder group {} (from {}) has no name; " "add it to taskcluster/ci/config.yml"
+)
+
+V2_ROUTE_TEMPLATES = [
+    "index.{trust-domain}.v2.{project}.latest.{product}.{job-name}",
+    "index.{trust-domain}.v2.{project}.pushdate.{build_date_long}.{product}.{job-name}",
+    "index.{trust-domain}.v2.{project}.pushdate.{build_date}.latest.{product}.{job-name}",
+    "index.{trust-domain}.v2.{project}.pushlog-id.{pushlog_id}.{product}.{job-name}",
+    "index.{trust-domain}.v2.{project}.revision.{branch_rev}.{product}.{job-name}",
+]
+
+# {central, inbound, autoland} write to a "trunk" index prefix. This facilitates
+# walking of tasks with similar configurations.
+V2_TRUNK_ROUTE_TEMPLATES = [
+    "index.{trust-domain}.v2.trunk.revision.{branch_rev}.{product}.{job-name}",
+]
+
+V2_SHIPPABLE_TEMPLATES = [
+    "index.{trust-domain}.v2.{project}.shippable.latest.{product}.{job-name}",
+    "index.{trust-domain}.v2.{project}.shippable.{build_date}.revision.{branch_rev}.{product}.{job-name}",  # noqa - too long
+    "index.{trust-domain}.v2.{project}.shippable.{build_date}.latest.{product}.{job-name}",
+    "index.{trust-domain}.v2.{project}.shippable.revision.{branch_rev}.{product}.{job-name}",
+]
+
+V2_SHIPPABLE_L10N_TEMPLATES = [
+    "index.{trust-domain}.v2.{project}.shippable.latest.{product}-l10n.{job-name}.{locale}",
+    "index.{trust-domain}.v2.{project}.shippable.{build_date}.revision.{branch_rev}.{product}-l10n.{job-name}.{locale}",  # noqa - too long
+    "index.{trust-domain}.v2.{project}.shippable.{build_date}.latest.{product}-l10n.{job-name}.{locale}",  # noqa - too long
+    "index.{trust-domain}.v2.{project}.shippable.revision.{branch_rev}.{product}-l10n.{job-name}.{locale}",  # noqa - too long
+]
+
+V2_L10N_TEMPLATES = [
+    "index.{trust-domain}.v2.{project}.revision.{branch_rev}.{product}-l10n.{job-name}.{locale}",
+    "index.{trust-domain}.v2.{project}.pushdate.{build_date_long}.{product}-l10n.{job-name}.{locale}",  # noqa - too long
+    "index.{trust-domain}.v2.{project}.pushlog-id.{pushlog_id}.{product}-l10n.{job-name}.{locale}",
+    "index.{trust-domain}.v2.{project}.latest.{product}-l10n.{job-name}.{locale}",
+]
+
+# This index is specifically for builds that include geckoview releases,
+# so we can hard-code the project to "geckoview"
+V2_GECKOVIEW_RELEASE = "index.{trust-domain}.v2.{project}.geckoview-version.{geckoview-version}.{product}.{job-name}"  # noqa - too long
+
+# the roots of the treeherder routes
+TREEHERDER_ROUTE_ROOT = "tc-treeherder"
+
+
+def get_branch_rev(config):
+    return config.params[
+        "{}head_rev".format(config.graph_config["project-repo-param-prefix"])
+    ]
+
+
+def get_branch_repo(config):
+    return config.params[
+        "{}head_repository".format(
+            config.graph_config["project-repo-param-prefix"],
+        )
+    ]
+
+
+@memoize
+def get_default_priority(graph_config, project):
+    return evaluate_keyed_by(
+        graph_config["task-priority"], "Graph Config", {"project": project}
+    )
+
+
+# define a collection of payload builders, depending on the worker implementation
+payload_builders = {}
+
+
+@attr.s(frozen=True)
+class PayloadBuilder:
+    schema = attr.ib(type=Schema)
+    builder = attr.ib()
+
+
+def payload_builder(name, schema):
+    schema = Schema({Required("implementation"): name, Optional("os"): str}).extend(
+        schema
+    )
+
+    def wrap(func):
+        payload_builders[name] = PayloadBuilder(schema, func)
+        return func
+
+    return wrap
+
+
+# define a collection of index builders, depending on the type implementation
+index_builders = {}
+
+
+def index_builder(name):
+    def wrap(func):
+        index_builders[name] = func
+        return func
+
+    return wrap
+
+
+UNSUPPORTED_INDEX_PRODUCT_ERROR = """\
+The gecko-v2 product {product} is not in the list of configured products in
+`taskcluster/ci/config.yml'.
+"""
+
+
+def verify_index(config, index):
+    product = index["product"]
+    if product not in config.graph_config["index"]["products"]:
+        raise Exception(UNSUPPORTED_INDEX_PRODUCT_ERROR.format(product=product))
+
+
+@payload_builder(
+    "docker-worker",
+    schema={
+        Required("os"): "linux",
+        # For tasks that will run in docker-worker, this is the
+        # name of the docker image or in-tree docker image to run the task in.  If
+        # in-tree, then a dependency will be created automatically.  This is
+        # generally `desktop-test`, or an image that acts an awful lot like it.
+        Required("docker-image"): Any(
+            # a raw Docker image path (repo/image:tag)
+            str,
+            # an in-tree generated docker image (from `taskcluster/docker/<name>`)
+            {"in-tree": str},
+            # an indexed docker image
+            {"indexed": str},
+        ),
+        # worker features that should be enabled
+        Required("chain-of-trust"): bool,
+        Required("taskcluster-proxy"): bool,
+        Required("allow-ptrace"): bool,
+        Required("loopback-video"): bool,
+        Required("loopback-audio"): bool,
+        Required("docker-in-docker"): bool,  # (aka 'dind')
+        Required("privileged"): bool,
+        # Paths to Docker volumes.
+        #
+        # For in-tree Docker images, volumes can be parsed from Dockerfile.
+        # This only works for the Dockerfile itself: if a volume is defined in
+        # a base image, it will need to be declared here. Out-of-tree Docker
+        # images will also require explicit volume annotation.
+        #
+        # Caches are often mounted to the same path as Docker volumes. In this
+        # case, they take precedence over a Docker volume. But a volume still
+        # needs to be declared for the path.
+        Optional("volumes"): [str],
+        Optional(
+            "required-volumes",
+            description=(
+                "Paths that are required to be volumes for performance reasons. "
+                "For in-tree images, these paths will be checked to verify that they "
+                "are defined as volumes."
+            ),
+        ): [str],
+        # caches to set up for the task
+        Optional("caches"): [
+            {
+                # only one type is supported by any of the workers right now
+                "type": "persistent",
+                # name of the cache, allowing re-use by subsequent tasks naming the
+                # same cache
+                "name": str,
+                # location in the task image where the cache will be mounted
+                "mount-point": str,
+                # Whether the cache is not used in untrusted environments
+                # (like the Try repo).
+                Optional("skip-untrusted"): bool,
+            }
+        ],
+        # artifacts to extract from the task image after completion
+        Optional("artifacts"): [
+            {
+                # type of artifact -- simple file, or recursive directory
+                "type": Any("file", "directory"),
+                # task image path from which to read artifact
+                "path": str,
+                # name of the produced artifact (root of the names for
+                # type=directory)
+                "name": str,
+                "expires-after": str,
+            }
+        ],
+        # environment variables
+        Required("env"): {str: taskref_or_string},
+        # the command to run; if not given, docker-worker will default to the
+        # command in the docker image
+        Optional("command"): [taskref_or_string],
+        # the maximum time to run, in seconds
+        Required("max-run-time"): int,
+        # the exit status code(s) that indicates the task should be retried
+        Optional("retry-exit-status"): [int],
+        # the exit status code(s) that indicates the caches used by the task
+        # should be purged
+        Optional("purge-caches-exit-status"): [int],
+        # Whether any artifacts are assigned to this worker
+        Optional("skip-artifacts"): bool,
+    },
+)
+def build_docker_worker_payload(config, task, task_def):
+    worker = task["worker"]
+    level = int(config.params["level"])
+
+    image = worker["docker-image"]
+    if isinstance(image, dict):
+        if "in-tree" in image:
+            name = image["in-tree"]
+            docker_image_task = "docker-image-" + image["in-tree"]
+            task.setdefault("dependencies", {})["docker-image"] = docker_image_task
+
+            image = {
+                "path": "public/image.tar.zst",
+                "taskId": {"task-reference": "<docker-image>"},
+                "type": "task-image",
+            }
+
+            # Find VOLUME in Dockerfile.
+            volumes = dockerutil.parse_volumes(name)
+            for v in sorted(volumes):
+                if v in worker["volumes"]:
+                    raise Exception(
+                        "volume %s already defined; "
+                        "if it is defined in a Dockerfile, "
+                        "it does not need to be specified in the "
+                        "worker definition" % v
+                    )
+
+                worker["volumes"].append(v)
+
+        elif "indexed" in image:
+            image = {
+                "path": "public/image.tar.zst",
+                "namespace": image["indexed"],
+                "type": "indexed-image",
+            }
+        else:
+            raise Exception("unknown docker image type")
+
+    features = {}
+
+    if worker.get("taskcluster-proxy"):
+        features["taskclusterProxy"] = True
+
+    if worker.get("allow-ptrace"):
+        features["allowPtrace"] = True
+        task_def["scopes"].append("docker-worker:feature:allowPtrace")
+
+    if worker.get("chain-of-trust"):
+        features["chainOfTrust"] = True
+
+    if worker.get("docker-in-docker"):
+        features["dind"] = True
+
+    # Never enable sccache on the toolchains repo, as there is no benefit from it
+    # because each push uses a different compiler.
+    if task.get("use-sccache") and config.params["project"] != "toolchains":
+        features["taskclusterProxy"] = True
+        task_def["scopes"].append(
+            "assume:project:taskcluster:{trust_domain}:level-{level}-sccache-buckets".format(
+                trust_domain=config.graph_config["trust-domain"],
+                level=config.params["level"],
+            )
+        )
+        worker["env"]["USE_SCCACHE"] = "1"
+        worker["env"]["SCCACHE_GCS_PROJECT"] = SCCACHE_GCS_PROJECT
+        # Disable sccache idle shutdown.
+        worker["env"]["SCCACHE_IDLE_TIMEOUT"] = "0"
+    else:
+        worker["env"]["SCCACHE_DISABLE"] = "1"
+
+    capabilities = {}
+
+    for lo in "audio", "video":
+        if worker.get("loopback-" + lo):
+            capitalized = "loopback" + lo.capitalize()
+            devices = capabilities.setdefault("devices", {})
+            devices[capitalized] = True
+            task_def["scopes"].append("docker-worker:capability:device:" + capitalized)
+
+    if worker.get("privileged"):
+        capabilities["privileged"] = True
+        task_def["scopes"].append("docker-worker:capability:privileged")
+
+    task_def["payload"] = payload = {
+        "image": image,
+        "env": worker["env"],
+    }
+    if "command" in worker:
+        payload["command"] = worker["command"]
+
+    if "max-run-time" in worker:
+        payload["maxRunTime"] = worker["max-run-time"]
+
+    run_task = payload.get("command", [""])[0].endswith("run-task")
+
+    # run-task exits EXIT_PURGE_CACHES if there is a problem with caches.
+    # Automatically retry the tasks and purge caches if we see this exit
+    # code.
+    # TODO move this closer to code adding run-task once bug 1469697 is
+    # addressed.
+    if run_task:
+        worker.setdefault("retry-exit-status", []).append(72)
+        worker.setdefault("purge-caches-exit-status", []).append(72)
+
+    payload["onExitStatus"] = {}
+    if "retry-exit-status" in worker:
+        payload["onExitStatus"]["retry"] = worker["retry-exit-status"]
+    if "purge-caches-exit-status" in worker:
+        payload["onExitStatus"]["purgeCaches"] = worker["purge-caches-exit-status"]
+
+    if "artifacts" in worker:
+        artifacts = {}
+        expires_policy = get_expiration(
+            config, task.get("expiration-policy", "default")
+        )
+        now = datetime.datetime.utcnow()
+        task_exp = task_def["expires"]["relative-datestamp"]
+        task_exp_from_now = fromNow(task_exp)
+        for artifact in worker["artifacts"]:
+            art_exp = artifact.get("expires-after", expires_policy)
+            expires = art_exp if fromNow(art_exp, now) < task_exp_from_now else task_exp
+            artifacts[artifact["name"]] = {
+                "path": artifact["path"],
+                "type": artifact["type"],
+                "expires": {"relative-datestamp": expires},
+            }
+        payload["artifacts"] = artifacts
+
+    if isinstance(worker.get("docker-image"), str):
+        out_of_tree_image = worker["docker-image"]
+    else:
+        out_of_tree_image = None
+        image = worker.get("docker-image", {}).get("in-tree")
+
+    if "caches" in worker:
+        caches = {}
+
+        # run-task knows how to validate caches.
+        #
+        # To help ensure new run-task features and bug fixes don't interfere
+        # with existing caches, we seed the hash of run-task into cache names.
+        # So, any time run-task changes, we should get a fresh set of caches.
+        # This means run-task can make changes to cache interaction at any time
+        # without regards for backwards or future compatibility.
+        #
+        # But this mechanism only works for in-tree Docker images that are built
+        # with the current run-task! For out-of-tree Docker images, we have no
+        # way of knowing their content of run-task. So, in addition to varying
+        # cache names by the contents of run-task, we also take the Docker image
+        # name into consideration. This means that different Docker images will
+        # never share the same cache. This is a bit unfortunate. But it is the
+        # safest thing to do. Fortunately, most images are defined in-tree.
+        #
+        # For out-of-tree Docker images, we don't strictly need to incorporate
+        # the run-task content into the cache name. However, doing so preserves
+        # the mechanism whereby changing run-task results in new caches
+        # everywhere.
+
+        # As an additional mechanism to force the use of different caches, the
+        # string literal in the variable below can be changed. This is
+        # preferred to changing run-task because it doesn't require images
+        # to be rebuilt.
+        cache_version = "v3"
+
+        if run_task:
+            suffix = f"{cache_version}-{_run_task_suffix()}"
+
+            if out_of_tree_image:
+                name_hash = hashlib.sha256(
+                    out_of_tree_image.encode("utf-8")
+                ).hexdigest()
+                suffix += name_hash[0:12]
+
+        else:
+            suffix = cache_version
+
+        skip_untrusted = is_try(config.params) or level == 1
+
+        for cache in worker["caches"]:
+            # Some caches aren't enabled in environments where we can't
+            # guarantee certain behavior. Filter those out.
+            if cache.get("skip-untrusted") and skip_untrusted:
+                continue
+
+            name = "{trust_domain}-level-{level}-{name}-{suffix}".format(
+                trust_domain=config.graph_config["trust-domain"],
+                level=config.params["level"],
+                name=cache["name"],
+                suffix=suffix,
+            )
+
+            caches[name] = cache["mount-point"]
+            task_def["scopes"].append("docker-worker:cache:%s" % name)
+
+        # Assertion: only run-task is interested in this.
+        if run_task:
+            payload["env"]["TASKCLUSTER_CACHES"] = ";".join(sorted(caches.values()))
+
+        payload["cache"] = caches
+
+    # And send down volumes information to run-task as well.
+    if run_task and worker.get("volumes"):
+        payload["env"]["TASKCLUSTER_VOLUMES"] = ";".join(sorted(worker["volumes"]))
+
+    if payload.get("cache") and skip_untrusted:
+        payload["env"]["TASKCLUSTER_UNTRUSTED_CACHES"] = "1"
+
+    if features:
+        payload["features"] = features
+    if capabilities:
+        payload["capabilities"] = capabilities
+
+    check_caches_are_volumes(task)
+    check_required_volumes(task)
+
+
+@payload_builder(
+    "generic-worker",
+    schema={
+        Required("os"): Any("windows", "macosx", "linux", "linux-bitbar"),
+        # see http://schemas.taskcluster.net/generic-worker/v1/payload.json
+        # and https://docs.taskcluster.net/reference/workers/generic-worker/payload
+        # command is a list of commands to run, sequentially
+        # on Windows, each command is a string, on OS X and Linux, each command is
+        # a string array
+        Required("command"): Any(
+            [taskref_or_string], [[taskref_or_string]]  # Windows  # Linux / OS X
+        ),
+        # artifacts to extract from the task image after completion; note that artifacts
+        # for the generic worker cannot have names
+        Optional("artifacts"): [
+            {
+                # type of artifact -- simple file, or recursive directory
+                "type": Any("file", "directory"),
+                # filesystem path from which to read artifact
+                "path": str,
+                # if not specified, path is used for artifact name
+                Optional("name"): str,
+                "expires-after": str,
+            }
+        ],
+        # Directories and/or files to be mounted.
+        # The actual allowed combinations are stricter than the model below,
+        # but this provides a simple starting point.
+        # See https://docs.taskcluster.net/reference/workers/generic-worker/payload
+        Optional("mounts"): [
+            {
+                # A unique name for the cache volume, implies writable cache directory
+                # (otherwise mount is a read-only file or directory).
+                Optional("cache-name"): str,
+                # Optional content for pre-loading cache, or mandatory content for
+                # read-only file or directory. Pre-loaded content can come from either
+                # a task artifact or from a URL.
+                Optional("content"): {
+                    # *** Either (artifact and task-id) or url must be specified. ***
+                    # Artifact name that contains the content.
+                    Optional("artifact"): str,
+                    # Task ID that has the artifact that contains the content.
+                    Optional("task-id"): taskref_or_string,
+                    # URL that supplies the content in response to an unauthenticated
+                    # GET request.
+                    Optional("url"): str,
+                },
+                # *** Either file or directory must be specified. ***
+                # If mounting a cache or read-only directory, the filesystem location of
+                # the directory should be specified as a relative path to the task
+                # directory here.
+                Optional("directory"): str,
+                # If mounting a file, specify the relative path within the task
+                # directory to mount the file (the file will be read only).
+                Optional("file"): str,
+                # Required if and only if `content` is specified and mounting a
+                # directory (not a file). This should be the archive format of the
+                # content (either pre-loaded cache or read-only directory).
+                Optional("format"): Any("rar", "tar.bz2", "tar.gz", "zip"),
+            }
+        ],
+        # environment variables
+        Required("env"): {str: taskref_or_string},
+        # the maximum time to run, in seconds
+        Required("max-run-time"): int,
+        # os user groups for test task workers
+        Optional("os-groups"): [str],
+        # feature for test task to run as administarotr
+        Optional("run-as-administrator"): bool,
+        # optional features
+        Required("chain-of-trust"): bool,
+        Optional("taskcluster-proxy"): bool,
+        # the exit status code(s) that indicates the task should be retried
+        Optional("retry-exit-status"): [int],
+        # Wether any artifacts are assigned to this worker
+        Optional("skip-artifacts"): bool,
+    },
+)
+def build_generic_worker_payload(config, task, task_def):
+    worker = task["worker"]
+    features = {}
+
+    task_def["payload"] = {
+        "command": worker["command"],
+        "maxRunTime": worker["max-run-time"],
+    }
+
+    if worker["os"] == "windows":
+        task_def["payload"]["onExitStatus"] = {
+            "retry": [
+                # These codes (on windows) indicate a process interruption,
+                # rather than a task run failure. See bug 1544403.
+                1073807364,  # process force-killed due to system shutdown
+                3221225786,  # sigint (any interrupt)
+            ]
+        }
+    if "retry-exit-status" in worker:
+        task_def["payload"].setdefault("onExitStatus", {}).setdefault(
+            "retry", []
+        ).extend(worker["retry-exit-status"])
+    if worker["os"] == "linux-bitbar":
+        task_def["payload"].setdefault("onExitStatus", {}).setdefault("retry", [])
+        # exit code 4 is used to indicate an intermittent android device error
+        if 4 not in task_def["payload"]["onExitStatus"]["retry"]:
+            task_def["payload"]["onExitStatus"]["retry"].extend([4])
+
+    env = worker.get("env", {})
+
+    # Never enable sccache on the toolchains repo, as there is no benefit from it
+    # because each push uses a different compiler.
+    if task.get("use-sccache") and config.params["project"] != "toolchains":
+        features["taskclusterProxy"] = True
+        task_def["scopes"].append(
+            "assume:project:taskcluster:{trust_domain}:level-{level}-sccache-buckets".format(
+                trust_domain=config.graph_config["trust-domain"],
+                level=config.params["level"],
+            )
+        )
+        env["USE_SCCACHE"] = "1"
+        worker["env"]["SCCACHE_GCS_PROJECT"] = SCCACHE_GCS_PROJECT
+        # Disable sccache idle shutdown.
+        env["SCCACHE_IDLE_TIMEOUT"] = "0"
+    else:
+        env["SCCACHE_DISABLE"] = "1"
+
+    if env:
+        task_def["payload"]["env"] = env
+
+    artifacts = []
+
+    expires_policy = get_expiration(config, task.get("expiration-policy", "default"))
+    now = datetime.datetime.utcnow()
+    task_exp = task_def["expires"]["relative-datestamp"]
+    task_exp_from_now = fromNow(task_exp)
+    for artifact in worker.get("artifacts", []):
+        art_exp = artifact.get("expires-after", expires_policy)
+        task_exp = task_def["expires"]["relative-datestamp"]
+        expires = art_exp if fromNow(art_exp, now) < task_exp_from_now else task_exp
+        a = {
+            "path": artifact["path"],
+            "type": artifact["type"],
+            "expires": {"relative-datestamp": expires},
+        }
+        if "name" in artifact:
+            a["name"] = artifact["name"]
+        artifacts.append(a)
+
+    if artifacts:
+        task_def["payload"]["artifacts"] = artifacts
+
+    # Need to copy over mounts, but rename keys to respect naming convention
+    #   * 'cache-name' -> 'cacheName'
+    #   * 'task-id'    -> 'taskId'
+    # All other key names are already suitable, and don't need renaming.
+    mounts = copy_task(worker.get("mounts", []))
+    for mount in mounts:
+        if "cache-name" in mount:
+            mount["cacheName"] = "{trust_domain}-level-{level}-{name}".format(
+                trust_domain=config.graph_config["trust-domain"],
+                level=config.params["level"],
+                name=mount.pop("cache-name"),
+            )
+            task_def["scopes"].append(
+                "generic-worker:cache:{}".format(mount["cacheName"])
+            )
+        if "content" in mount:
+            if "task-id" in mount["content"]:
+                mount["content"]["taskId"] = mount["content"].pop("task-id")
+            if "artifact" in mount["content"]:
+                if not mount["content"]["artifact"].startswith("public/"):
+                    task_def["scopes"].append(
+                        "queue:get-artifact:{}".format(mount["content"]["artifact"])
+                    )
+
+    if mounts:
+        task_def["payload"]["mounts"] = mounts
+
+    if worker.get("os-groups"):
+        task_def["payload"]["osGroups"] = worker["os-groups"]
+        task_def["scopes"].extend(
+            [
+                "generic-worker:os-group:{}/{}".format(task["worker-type"], group)
+                for group in worker["os-groups"]
+            ]
+        )
+
+    if worker.get("chain-of-trust"):
+        features["chainOfTrust"] = True
+
+    if worker.get("taskcluster-proxy"):
+        features["taskclusterProxy"] = True
+
+    if worker.get("run-as-administrator", False):
+        features["runAsAdministrator"] = True
+        task_def["scopes"].append(
+            "generic-worker:run-as-administrator:{}".format(task["worker-type"]),
+        )
+
+    if features:
+        task_def["payload"]["features"] = features
+
+
+@payload_builder(
+    "scriptworker-signing",
+    schema={
+        # the maximum time to run, in seconds
+        Required("max-run-time"): int,
+        # list of artifact URLs for the artifacts that should be signed
+        Required("upstream-artifacts"): [
+            {
+                # taskId of the task with the artifact
+                Required("taskId"): taskref_or_string,
+                # type of signing task (for CoT)
+                Required("taskType"): str,
+                # Paths to the artifacts to sign
+                Required("paths"): [str],
+                # Signing formats to use on each of the paths
+                Required("formats"): [str],
+                Optional("singleFileGlobs"): [str],
+            }
+        ],
+        # behavior for mac iscript
+        Optional("mac-behavior"): Any(
+            "apple_notarization",
+            "mac_sign_and_pkg",
+            "mac_geckodriver",
+            "mac_notarize_geckodriver",
+            "mac_single_file",
+            "mac_notarize_single_file",
+        ),
+        Optional("entitlements-url"): str,
+        Optional("requirements-plist-url"): str,
+    },
+)
+def build_scriptworker_signing_payload(config, task, task_def):
+    worker = task["worker"]
+
+    task_def["payload"] = {
+        "maxRunTime": worker["max-run-time"],
+        "upstreamArtifacts": worker["upstream-artifacts"],
+    }
+    if worker.get("mac-behavior"):
+        task_def["payload"]["behavior"] = worker["mac-behavior"]
+        for attribute in ("entitlements-url", "requirements-plist-url"):
+            if worker.get(attribute):
+                task_def["payload"][attribute] = worker[attribute]
+
+    artifacts = set(task.setdefault("attributes", {}).get("release_artifacts", []))
+    for upstream_artifact in worker["upstream-artifacts"]:
+        for path in upstream_artifact["paths"]:
+            artifacts.update(
+                get_signed_artifacts(
+                    input=path,
+                    formats=upstream_artifact["formats"],
+                    behavior=worker.get("mac-behavior"),
+                )
+            )
+    task["attributes"]["release_artifacts"] = sorted(list(artifacts))
+
+
+@payload_builder(
+    "beetmover",
+    schema={
+        # the maximum time to run, in seconds
+        Required("max-run-time"): int,
+        # locale key, if this is a locale beetmover job
+        Optional("locale"): str,
+        Optional("partner-public"): bool,
+        Required("release-properties"): {
+            "app-name": str,
+            "app-version": str,
+            "branch": str,
+            "build-id": str,
+            "hash-type": str,
+            "platform": str,
+        },
+        # list of artifact URLs for the artifacts that should be beetmoved
+        Required("upstream-artifacts"): [
+            {
+                # taskId of the task with the artifact
+                Required("taskId"): taskref_or_string,
+                # type of signing task (for CoT)
+                Required("taskType"): str,
+                # Paths to the artifacts to sign
+                Required("paths"): [str],
+                # locale is used to map upload path and allow for duplicate simple names
+                Required("locale"): str,
+            }
+        ],
+        Optional("artifact-map"): object,
+    },
+)
+def build_beetmover_payload(config, task, task_def):
+    worker = task["worker"]
+    release_config = get_release_config(config)
+    release_properties = worker["release-properties"]
+
+    task_def["payload"] = {
+        "maxRunTime": worker["max-run-time"],
+        "releaseProperties": {
+            "appName": release_properties["app-name"],
+            "appVersion": release_properties["app-version"],
+            "branch": release_properties["branch"],
+            "buildid": release_properties["build-id"],
+            "hashType": release_properties["hash-type"],
+            "platform": release_properties["platform"],
+        },
+        "upload_date": config.params["build_date"],
+        "upstreamArtifacts": worker["upstream-artifacts"],
+    }
+    if worker.get("locale"):
+        task_def["payload"]["locale"] = worker["locale"]
+    if worker.get("artifact-map"):
+        task_def["payload"]["artifactMap"] = worker["artifact-map"]
+    if worker.get("partner-public"):
+        task_def["payload"]["is_partner_repack_public"] = worker["partner-public"]
+    if release_config:
+        task_def["payload"].update(release_config)
+
+
+@payload_builder(
+    "beetmover-push-to-release",
+    schema={
+        # the maximum time to run, in seconds
+        Required("max-run-time"): int,
+        Required("product"): str,
+    },
+)
+def build_beetmover_push_to_release_payload(config, task, task_def):
+    worker = task["worker"]
+    release_config = get_release_config(config)
+    partners = [f"{p}/{s}" for p, s, _ in get_partners_to_be_published(config)]
+
+    task_def["payload"] = {
+        "maxRunTime": worker["max-run-time"],
+        "product": worker["product"],
+        "version": release_config["version"],
+        "build_number": release_config["build_number"],
+        "partners": partners,
+    }
+
+
+@payload_builder(
+    "beetmover-import-from-gcs-to-artifact-registry",
+    schema={
+        Required("max-run-time"): int,
+        Required("gcs-sources"): [str],
+        Required("product"): str,
+    },
+)
+def build_import_from_gcs_to_artifact_registry_payload(config, task, task_def):
+    task_def["payload"] = {
+        "product": task["worker"]["product"],
+        "gcs_sources": task["worker"]["gcs-sources"],
+    }
+
+
+@payload_builder(
+    "beetmover-maven",
+    schema={
+        Required("max-run-time"): int,
+        Required("release-properties"): {
+            "app-name": str,
+            "app-version": str,
+            "branch": str,
+            "build-id": str,
+            "artifact-id": str,
+            "hash-type": str,
+            "platform": str,
+        },
+        Required("upstream-artifacts"): [
+            {
+                Required("taskId"): taskref_or_string,
+                Required("taskType"): str,
+                Required("paths"): [str],
+                Optional("zipExtract"): bool,
+            }
+        ],
+        Optional("artifact-map"): object,
+    },
+)
+def build_beetmover_maven_payload(config, task, task_def):
+    build_beetmover_payload(config, task, task_def)
+
+    task_def["payload"]["artifact_id"] = task["worker"]["release-properties"][
+        "artifact-id"
+    ]
+    if task["worker"].get("artifact-map"):
+        task_def["payload"]["artifactMap"] = task["worker"]["artifact-map"]
+
+    task_def["payload"]["version"] = _compute_geckoview_version(
+        task["worker"]["release-properties"]["app-version"],
+        task["worker"]["release-properties"]["build-id"],
+    )
+
+    del task_def["payload"]["releaseProperties"]["hashType"]
+    del task_def["payload"]["releaseProperties"]["platform"]
+
+
+@payload_builder(
+    "balrog",
+    schema={
+        Required("balrog-action"): Any(*BALROG_ACTIONS),
+        Optional("product"): str,
+        Optional("platforms"): [str],
+        Optional("release-eta"): str,
+        Optional("channel-names"): optionally_keyed_by("release-type", [str]),
+        Optional("require-mirrors"): bool,
+        Optional("publish-rules"): optionally_keyed_by(
+            "release-type", "release-level", [int]
+        ),
+        Optional("rules-to-update"): optionally_keyed_by(
+            "release-type", "release-level", [str]
+        ),
+        Optional("archive-domain"): optionally_keyed_by("release-level", str),
+        Optional("download-domain"): optionally_keyed_by("release-level", str),
+        Optional("blob-suffix"): str,
+        Optional("complete-mar-filename-pattern"): str,
+        Optional("complete-mar-bouncer-product-pattern"): str,
+        Optional("update-line"): object,
+        Optional("suffixes"): [str],
+        Optional("background-rate"): optionally_keyed_by(
+            "release-type", "beta-number", Any(int, None)
+        ),
+        Optional("force-fallback-mapping-update"): optionally_keyed_by(
+            "release-type", "beta-number", bool
+        ),
+        Optional("pin-channels"): optionally_keyed_by(
+            "release-type", "release-level", [str]
+        ),
+        # list of artifact URLs for the artifacts that should be beetmoved
+        Optional("upstream-artifacts"): [
+            {
+                # taskId of the task with the artifact
+                Required("taskId"): taskref_or_string,
+                # type of signing task (for CoT)
+                Required("taskType"): str,
+                # Paths to the artifacts to sign
+                Required("paths"): [str],
+            }
+        ],
+    },
+)
+def build_balrog_payload(config, task, task_def):
+    worker = task["worker"]
+    release_config = get_release_config(config)
+    beta_number = None
+    if "b" in release_config["version"]:
+        beta_number = release_config["version"].split("b")[-1]
+
+    task_def["payload"] = {
+        "behavior": worker["balrog-action"],
+    }
+
+    if (
+        worker["balrog-action"] == "submit-locale"
+        or worker["balrog-action"] == "v2-submit-locale"
+    ):
+        task_def["payload"].update(
+            {
+                "upstreamArtifacts": worker["upstream-artifacts"],
+                "suffixes": worker["suffixes"],
+            }
+        )
+    else:
+        for prop in (
+            "archive-domain",
+            "channel-names",
+            "download-domain",
+            "publish-rules",
+            "rules-to-update",
+            "background-rate",
+            "force-fallback-mapping-update",
+            "pin-channels",
+        ):
+            if prop in worker:
+                resolve_keyed_by(
+                    worker,
+                    prop,
+                    task["description"],
+                    **{
+                        "release-type": config.params["release_type"],
+                        "release-level": release_level(config.params["project"]),
+                        "beta-number": beta_number,
+                    },
+                )
+        task_def["payload"].update(
+            {
+                "build_number": release_config["build_number"],
+                "product": worker["product"],
+                "version": release_config["version"],
+            }
+        )
+        for prop in (
+            "blob-suffix",
+            "complete-mar-filename-pattern",
+            "complete-mar-bouncer-product-pattern",
+            "pin-channels",
+        ):
+            if prop in worker:
+                task_def["payload"][prop.replace("-", "_")] = worker[prop]
+        if (
+            worker["balrog-action"] == "submit-toplevel"
+            or worker["balrog-action"] == "v2-submit-toplevel"
+        ):
+            task_def["payload"].update(
+                {
+                    "app_version": release_config["appVersion"],
+                    "archive_domain": worker["archive-domain"],
+                    "channel_names": worker["channel-names"],
+                    "download_domain": worker["download-domain"],
+                    "partial_versions": release_config.get("partial_versions", ""),
+                    "platforms": worker["platforms"],
+                    "rules_to_update": worker["rules-to-update"],
+                    "require_mirrors": worker["require-mirrors"],
+                    "update_line": worker["update-line"],
+                }
+            )
+        else:  # schedule / ship
+            task_def["payload"].update(
+                {
+                    "publish_rules": worker["publish-rules"],
+                    "release_eta": worker.get(
+                        "release-eta", config.params.get("release_eta")
+                    )
+                    or "",
+                }
+            )
+            if worker.get("force-fallback-mapping-update"):
+                task_def["payload"]["force_fallback_mapping_update"] = worker[
+                    "force-fallback-mapping-update"
+                ]
+            if worker.get("background-rate"):
+                task_def["payload"]["background_rate"] = worker["background-rate"]
+
+
+@payload_builder(
+    "bouncer-aliases",
+    schema={
+        Required("entries"): object,
+    },
+)
+def build_bouncer_aliases_payload(config, task, task_def):
+    worker = task["worker"]
+
+    task_def["payload"] = {"aliases_entries": worker["entries"]}
+
+
+@payload_builder(
+    "bouncer-locations",
+    schema={
+        Required("implementation"): "bouncer-locations",
+        Required("bouncer-products"): [str],
+    },
+)
+def build_bouncer_locations_payload(config, task, task_def):
+    worker = task["worker"]
+    release_config = get_release_config(config)
+
+    task_def["payload"] = {
+        "bouncer_products": worker["bouncer-products"],
+        "version": release_config["version"],
+        "product": task["shipping-product"],
+    }
+
+
+@payload_builder(
+    "bouncer-submission",
+    schema={
+        Required("locales"): [str],
+        Required("entries"): object,
+    },
+)
+def build_bouncer_submission_payload(config, task, task_def):
+    worker = task["worker"]
+
+    task_def["payload"] = {
+        "locales": worker["locales"],
+        "submission_entries": worker["entries"],
+    }
+
+
+@payload_builder(
+    "push-flatpak",
+    schema={
+        Required("channel"): str,
+        Required("upstream-artifacts"): [
+            {
+                Required("taskId"): taskref_or_string,
+                Required("taskType"): str,
+                Required("paths"): [str],
+            }
+        ],
+    },
+)
+def build_push_flatpak_payload(config, task, task_def):
+    worker = task["worker"]
+
+    task_def["payload"] = {
+        "channel": worker["channel"],
+        "upstreamArtifacts": worker["upstream-artifacts"],
+    }
+
+
+@payload_builder(
+    "push-msix",
+    schema={
+        Required("channel"): str,
+        Optional("publish-mode"): str,
+        Required("upstream-artifacts"): [
+            {
+                Required("taskId"): taskref_or_string,
+                Required("taskType"): str,
+                Required("paths"): [str],
+            }
+        ],
+    },
+)
+def build_push_msix_payload(config, task, task_def):
+    worker = task["worker"]
+
+    task_def["payload"] = {
+        "channel": worker["channel"],
+        "upstreamArtifacts": worker["upstream-artifacts"],
+    }
+    if worker.get("publish-mode"):
+        task_def["payload"]["publishMode"] = worker["publish-mode"]
+
+
+@payload_builder(
+    "shipit-shipped",
+    schema={
+        Required("release-name"): str,
+    },
+)
+def build_ship_it_shipped_payload(config, task, task_def):
+    worker = task["worker"]
+
+    task_def["payload"] = {"release_name": worker["release-name"]}
+
+
+@payload_builder(
+    "shipit-maybe-release",
+    schema={
+        Required("phase"): str,
+    },
+)
+def build_ship_it_maybe_release_payload(config, task, task_def):
+    # expect branch name, including path
+    branch = config.params["head_repository"][len("https://hg.mozilla.org/") :]
+    # 'version' is e.g. '71.0b13' (app_version doesn't have beta number)
+    version = config.params["version"]
+
+    task_def["payload"] = {
+        "product": task["shipping-product"],
+        "branch": branch,
+        "phase": task["worker"]["phase"],
+        "version": version,
+        "cron_revision": config.params["head_rev"],
+    }
+
+
+@payload_builder(
+    "push-addons",
+    schema={
+        Required("channel"): Any("listed", "unlisted"),
+        Required("upstream-artifacts"): [
+            {
+                Required("taskId"): taskref_or_string,
+                Required("taskType"): str,
+                Required("paths"): [str],
+            }
+        ],
+    },
+)
+def build_push_addons_payload(config, task, task_def):
+    worker = task["worker"]
+
+    task_def["payload"] = {
+        "channel": worker["channel"],
+        "upstreamArtifacts": worker["upstream-artifacts"],
+    }
+
+
+@payload_builder(
+    "treescript",
+    schema={
+        Required("tags"): [Any("buildN", "release", None)],
+        Required("bump"): bool,
+        Optional("bump-files"): [str],
+        Optional("repo-param-prefix"): str,
+        Optional("dontbuild"): bool,
+        Optional("ignore-closed-tree"): bool,
+        Optional("force-dry-run"): bool,
+        Optional("push"): bool,
+        Optional("source-repo"): str,
+        Optional("ssh-user"): str,
+        Optional("l10n-bump-info"): {
+            Required("name"): str,
+            Required("path"): str,
+            Required("version-path"): str,
+            Optional("l10n-repo-url"): str,
+            Optional("ignore-config"): object,
+            Required("platform-configs"): [
+                {
+                    Required("platforms"): [str],
+                    Required("path"): str,
+                    Optional("format"): str,
+                }
+            ],
+        },
+        Optional("merge-info"): object,
+    },
+)
+def build_treescript_payload(config, task, task_def):
+    worker = task["worker"]
+    release_config = get_release_config(config)
+
+    task_def["payload"] = {"actions": []}
+    actions = task_def["payload"]["actions"]
+    if worker["tags"]:
+        tag_names = []
+        product = task["shipping-product"].upper()
+        version = release_config["version"].replace(".", "_")
+        buildnum = release_config["build_number"]
+        if "buildN" in worker["tags"]:
+            tag_names.extend(
+                [
+                    f"{product}_{version}_BUILD{buildnum}",
+                ]
+            )
+        if "release" in worker["tags"]:
+            tag_names.extend([f"{product}_{version}_RELEASE"])
+        tag_info = {
+            "tags": tag_names,
+            "revision": config.params[
+                "{}head_rev".format(worker.get("repo-param-prefix", ""))
+            ],
+        }
+        task_def["payload"]["tag_info"] = tag_info
+        actions.append("tag")
+
+    if worker["bump"]:
+        if not worker["bump-files"]:
+            raise Exception("Version Bump requested without bump-files")
+
+        bump_info = {}
+        bump_info["next_version"] = release_config["next_version"]
+        bump_info["files"] = worker["bump-files"]
+        task_def["payload"]["version_bump_info"] = bump_info
+        actions.append("version_bump")
+
+    if worker.get("l10n-bump-info"):
+        l10n_bump_info = {}
+        for k, v in worker["l10n-bump-info"].items():
+            l10n_bump_info[k.replace("-", "_")] = worker["l10n-bump-info"][k]
+        task_def["payload"]["l10n_bump_info"] = [l10n_bump_info]
+        actions.append("l10n_bump")
+
+    if worker.get("merge-info"):
+        merge_info = {
+            merge_param_name.replace("-", "_"): merge_param_value
+            for merge_param_name, merge_param_value in worker["merge-info"].items()
+            if merge_param_name != "version-files"
+        }
+        merge_info["version_files"] = [
+            {
+                file_param_name.replace("-", "_"): file_param_value
+                for file_param_name, file_param_value in file_entry.items()
+            }
+            for file_entry in worker["merge-info"]["version-files"]
+        ]
+        task_def["payload"]["merge_info"] = merge_info
+        actions.append("merge_day")
+
+    if worker["push"]:
+        actions.append("push")
+
+    if worker.get("force-dry-run"):
+        task_def["payload"]["dry_run"] = True
+
+    if worker.get("dontbuild"):
+        task_def["payload"]["dontbuild"] = True
+
+    if worker.get("ignore-closed-tree") is not None:
+        task_def["payload"]["ignore_closed_tree"] = worker["ignore-closed-tree"]
+
+    if worker.get("source-repo"):
+        task_def["payload"]["source_repo"] = worker["source-repo"]
+
+    if worker.get("ssh-user"):
+        task_def["payload"]["ssh_user"] = worker["ssh-user"]
+
+
+@payload_builder(
+    "invalid",
+    schema={
+        # an invalid task is one which should never actually be created; this is used in
+        # release automation on branches where the task just doesn't make sense
+        Extra: object,
+    },
+)
+def build_invalid_payload(config, task, task_def):
+    task_def["payload"] = "invalid task - should never be created"
+
+
+@payload_builder(
+    "always-optimized",
+    schema={
+        Extra: object,
+    },
+)
+@payload_builder("succeed", schema={})
+def build_dummy_payload(config, task, task_def):
+    task_def["payload"] = {}
+
+
+transforms = TransformSequence()
+
+
+@transforms.add
+def set_implementation(config, tasks):
+    """
+    Set the worker implementation based on the worker-type alias.
+    """
+    for task in tasks:
+        if "implementation" in task["worker"]:
+            yield task
+            continue
+
+        impl, os = worker_type_implementation(
+            config.graph_config, config.params, task["worker-type"]
+        )
+
+        tags = task.setdefault("tags", {})
+        tags["worker-implementation"] = impl
+        if os:
+            tags["os"] = os
+
+        worker = task.setdefault("worker", {})
+        worker["implementation"] = impl
+        if os:
+            worker["os"] = os
+
+        yield task
+
+
+@transforms.add
+def set_defaults(config, tasks):
+    for task in tasks:
+        task.setdefault("shipping-phase", None)
+        task.setdefault("shipping-product", None)
+        task.setdefault("always-target", False)
+        task.setdefault("optimization", None)
+        task.setdefault("use-sccache", False)
+
+        worker = task["worker"]
+        if worker["implementation"] in ("docker-worker",):
+            worker.setdefault("chain-of-trust", False)
+            worker.setdefault("taskcluster-proxy", False)
+            worker.setdefault("allow-ptrace", True)
+            worker.setdefault("loopback-video", False)
+            worker.setdefault("loopback-audio", False)
+            worker.setdefault("docker-in-docker", False)
+            worker.setdefault("privileged", False)
+            worker.setdefault("volumes", [])
+            worker.setdefault("env", {})
+            if "caches" in worker:
+                for c in worker["caches"]:
+                    c.setdefault("skip-untrusted", False)
+        elif worker["implementation"] == "generic-worker":
+            worker.setdefault("env", {})
+            worker.setdefault("os-groups", [])
+            if worker["os-groups"] and worker["os"] != "windows":
+                raise Exception(
+                    "os-groups feature of generic-worker is only supported on "
+                    "Windows, not on {}".format(worker["os"])
+                )
+            worker.setdefault("chain-of-trust", False)
+        elif worker["implementation"] in (
+            "scriptworker-signing",
+            "beetmover",
+            "beetmover-push-to-release",
+            "beetmover-maven",
+            "beetmover-import-from-gcs-to-artifact-registry",
+        ):
+            worker.setdefault("max-run-time", 600)
+        elif worker["implementation"] == "push-apk":
+            worker.setdefault("commit", False)
+
+        yield task
+
+
+@transforms.add
+def setup_raptor(config, tasks):
+    """Add options that are specific to raptor jobs (identified by suite=raptor).
+
+    This variant uses a separate set of transforms for manipulating the tests at the
+    task-level. Currently only used for setting the taskcluster proxy setting and
+    the scopes required for perftest secrets.
+    """
+    from gecko_taskgraph.transforms.test.raptor import (
+        task_transforms as raptor_transforms,
+    )
+
+    for task in tasks:
+        if task.get("extra", {}).get("suite", "") != "raptor":
+            yield task
+            continue
+
+        yield from raptor_transforms(config, [task])
+
+
+@transforms.add
+def task_name_from_label(config, tasks):
+    for task in tasks:
+        taskname = task.pop("name", None)
+        if "label" not in task:
+            if taskname is None:
+                raise Exception("task has neither a name nor a label")
+            task["label"] = "{}-{}".format(config.kind, taskname)
+        yield task
+
+
+UNSUPPORTED_SHIPPING_PRODUCT_ERROR = """\
+The shipping product {product} is not in the list of configured products in
+`taskcluster/ci/config.yml'.
+"""
+
+
+def validate_shipping_product(config, product):
+    if product not in config.graph_config["release-promotion"]["products"]:
+        raise Exception(UNSUPPORTED_SHIPPING_PRODUCT_ERROR.format(product=product))
+
+
+@transforms.add
+def validate(config, tasks):
+    for task in tasks:
+        validate_schema(
+            task_description_schema,
+            task,
+            "In task {!r}:".format(task.get("label", "?no-label?")),
+        )
+        validate_schema(
+            payload_builders[task["worker"]["implementation"]].schema,
+            task["worker"],
+            "In task.run {!r}:".format(task.get("label", "?no-label?")),
+        )
+        if task["shipping-product"] is not None:
+            validate_shipping_product(config, task["shipping-product"])
+        yield task
+
+
+@index_builder("generic")
+def add_generic_index_routes(config, task):
+    index = task.get("index")
+    routes = task.setdefault("routes", [])
+
+    verify_index(config, index)
+
+    subs = config.params.copy()
+    subs["job-name"] = index["job-name"]
+    subs["build_date_long"] = time.strftime(
+        "%Y.%m.%d.%Y%m%d%H%M%S", time.gmtime(config.params["build_date"])
+    )
+    subs["build_date"] = time.strftime(
+        "%Y.%m.%d", time.gmtime(config.params["build_date"])
+    )
+    subs["product"] = index["product"]
+    subs["trust-domain"] = config.graph_config["trust-domain"]
+    subs["branch_rev"] = get_branch_rev(config)
+
+    project = config.params.get("project")
+
+    for tpl in V2_ROUTE_TEMPLATES:
+        routes.append(tpl.format(**subs))
+
+    # Additionally alias all tasks for "trunk" repos into a common
+    # namespace.
+    if project and project in TRUNK_PROJECTS:
+        for tpl in V2_TRUNK_ROUTE_TEMPLATES:
+            routes.append(tpl.format(**subs))
+
+    return task
+
+
+@index_builder("shippable")
+def add_shippable_index_routes(config, task):
+    index = task.get("index")
+    routes = task.setdefault("routes", [])
+
+    verify_index(config, index)
+
+    subs = config.params.copy()
+    subs["job-name"] = index["job-name"]
+    subs["build_date_long"] = time.strftime(
+        "%Y.%m.%d.%Y%m%d%H%M%S", time.gmtime(config.params["build_date"])
+    )
+    subs["build_date"] = time.strftime(
+        "%Y.%m.%d", time.gmtime(config.params["build_date"])
+    )
+    subs["product"] = index["product"]
+    subs["trust-domain"] = config.graph_config["trust-domain"]
+    subs["branch_rev"] = get_branch_rev(config)
+
+    for tpl in V2_SHIPPABLE_TEMPLATES:
+        routes.append(tpl.format(**subs))
+
+    # Also add routes for en-US
+    task = add_shippable_l10n_index_routes(config, task, force_locale="en-US")
+
+    return task
+
+
+@index_builder("shippable-with-multi-l10n")
+def add_shippable_multi_index_routes(config, task):
+    task = add_shippable_index_routes(config, task)
+    task = add_l10n_index_routes(config, task, force_locale="multi")
+    return task
+
+
+@index_builder("l10n")
+def add_l10n_index_routes(config, task, force_locale=None):
+    index = task.get("index")
+    routes = task.setdefault("routes", [])
+
+    verify_index(config, index)
+
+    subs = config.params.copy()
+    subs["job-name"] = index["job-name"]
+    subs["build_date_long"] = time.strftime(
+        "%Y.%m.%d.%Y%m%d%H%M%S", time.gmtime(config.params["build_date"])
+    )
+    subs["product"] = index["product"]
+    subs["trust-domain"] = config.graph_config["trust-domain"]
+    subs["branch_rev"] = get_branch_rev(config)
+
+    locales = task["attributes"].get(
+        "chunk_locales", task["attributes"].get("all_locales")
+    )
+    # Some tasks has only one locale set
+    if task["attributes"].get("locale"):
+        locales = [task["attributes"]["locale"]]
+
+    if force_locale:
+        # Used for en-US and multi-locale
+        locales = [force_locale]
+
+    if not locales:
+        raise Exception("Error: Unable to use l10n index for tasks without locales")
+
+    # If there are too many locales, we can't write a route for all of them
+    # See Bug 1323792
+    if len(locales) > 18:  # 18 * 3 = 54, max routes = 64
+        return task
+
+    for locale in locales:
+        for tpl in V2_L10N_TEMPLATES:
+            routes.append(tpl.format(locale=locale, **subs))
+
+    return task
+
+
+@index_builder("shippable-l10n")
+def add_shippable_l10n_index_routes(config, task, force_locale=None):
+    index = task.get("index")
+    routes = task.setdefault("routes", [])
+
+    verify_index(config, index)
+
+    subs = config.params.copy()
+    subs["job-name"] = index["job-name"]
+    subs["build_date_long"] = time.strftime(
+        "%Y.%m.%d.%Y%m%d%H%M%S", time.gmtime(config.params["build_date"])
+    )
+    subs["product"] = index["product"]
+    subs["trust-domain"] = config.graph_config["trust-domain"]
+    subs["branch_rev"] = get_branch_rev(config)
+
+    locales = task["attributes"].get(
+        "chunk_locales", task["attributes"].get("all_locales")
+    )
+    # Some tasks has only one locale set
+    if task["attributes"].get("locale"):
+        locales = [task["attributes"]["locale"]]
+
+    if force_locale:
+        # Used for en-US and multi-locale
+        locales = [force_locale]
+
+    if not locales:
+        raise Exception("Error: Unable to use l10n index for tasks without locales")
+
+    # If there are too many locales, we can't write a route for all of them
+    # See Bug 1323792
+    if len(locales) > 18:  # 18 * 3 = 54, max routes = 64
+        return task
+
+    for locale in locales:
+        for tpl in V2_SHIPPABLE_L10N_TEMPLATES:
+            routes.append(tpl.format(locale=locale, **subs))
+
+    return task
+
+
+def add_geckoview_index_routes(config, task):
+    index = task.get("index")
+    routes = task.setdefault("routes", [])
+    geckoview_version = _compute_geckoview_version(
+        config.params["app_version"], config.params["moz_build_date"]
+    )
+
+    subs = {
+        "geckoview-version": geckoview_version,
+        "job-name": index["job-name"],
+        "product": index["product"],
+        "project": config.params["project"],
+        "trust-domain": config.graph_config["trust-domain"],
+    }
+    routes.append(V2_GECKOVIEW_RELEASE.format(**subs))
+
+    return task
+
+
+@index_builder("android-shippable")
+def add_android_shippable_index_routes(config, task):
+    task = add_shippable_index_routes(config, task)
+    task = add_geckoview_index_routes(config, task)
+
+    return task
+
+
+@index_builder("android-shippable-with-multi-l10n")
+def add_android_shippable_multi_index_routes(config, task):
+    task = add_shippable_multi_index_routes(config, task)
+    task = add_geckoview_index_routes(config, task)
+
+    return task
+
+
+@transforms.add
+def add_index_routes(config, tasks):
+    for task in tasks:
+        index = task.get("index", {})
+
+        # The default behavior is to rank tasks according to their tier
+        extra_index = task.setdefault("extra", {}).setdefault("index", {})
+        rank = index.get("rank", "by-tier")
+
+        if rank == "by-tier":
+            # rank is zero for non-tier-1 tasks and based on pushid for others;
+            # this sorts tier-{2,3} builds below tier-1 in the index
+            tier = task.get("treeherder", {}).get("tier", 3)
+            extra_index["rank"] = 0 if tier > 1 else int(config.params["build_date"])
+        elif rank == "build_date":
+            extra_index["rank"] = int(config.params["build_date"])
+        else:
+            extra_index["rank"] = rank
+
+        if not index:
+            yield task
+            continue
+
+        index_type = index.get("type", "generic")
+        task = index_builders[index_type](config, task)
+
+        del task["index"]
+        yield task
+
+
+@transforms.add
+def try_task_config_env(config, tasks):
+    """Set environment variables in the task."""
+    env = config.params["try_task_config"].get("env")
+    if not env:
+        yield from tasks
+        return
+
+    # Find all implementations that have an 'env' key.
+    implementations = {
+        name
+        for name, builder in payload_builders.items()
+        if "env" in builder.schema.schema
+    }
+    for task in tasks:
+        if task["worker"]["implementation"] in implementations:
+            task["worker"]["env"].update(env)
+        yield task
+
+
+@transforms.add
+def try_task_config_chemspill_prio(config, tasks):
+    """Increase the priority from lowest and very-low -> low, but leave others unchanged."""
+    chemspill_prio = config.params["try_task_config"].get("chemspill-prio")
+    if not chemspill_prio:
+        yield from tasks
+        return
+
+    for task in tasks:
+        if task["priority"] in ("lowest", "very-low"):
+            task["priority"] = "low"
+        yield task
+
+
+@transforms.add
+def try_task_config_routes(config, tasks):
+    """Set routes in the task."""
+    routes = config.params["try_task_config"].get("routes")
+    for task in tasks:
+        if routes:
+            task_routes = task.setdefault("routes", [])
+            task_routes.extend(routes)
+        yield task
+
+
+@transforms.add
+def set_task_and_artifact_expiry(config, jobs):
+    """Set the default expiry for tasks and their artifacts.
+
+    These values are read from ci/config.yml
+    """
+    now = datetime.datetime.utcnow()
+    for job in jobs:
+        expires = get_expiration(config, job.get("expiration-policy", "default"))
+        job_expiry = job.setdefault("expires-after", expires)
+        job_expiry_from_now = fromNow(job_expiry)
+
+        for artifact in job["worker"].get("artifacts", ()):
+            artifact_expiry = artifact.setdefault("expires-after", expires)
+
+            # By using > instead of >=, there's a chance of mismatch
+            #   where the artifact expires sooner than the task.
+            #   There is no chance, however, of mismatch where artifacts
+            #   expire _after_ the task.
+            # Currently this leads to some build tasks having logs
+            #   that expire in 1 year while the task expires in 3 years.
+            if fromNow(artifact_expiry, now) > job_expiry_from_now:
+                artifact["expires-after"] = job_expiry
+
+        yield job
+
+
+@transforms.add
+def build_task(config, tasks):
+    for task in tasks:
+        level = str(config.params["level"])
+
+        task_worker_type = task["worker-type"]
+        worker_overrides = config.params["try_task_config"].get("worker-overrides", {})
+        if task_worker_type in worker_overrides:
+            worker_pool = worker_overrides[task_worker_type]
+            provisioner_id, worker_type = worker_pool.split("/", 1)
+        else:
+            provisioner_id, worker_type = get_worker_type(
+                config.graph_config,
+                config.params,
+                task_worker_type,
+            )
+        task["worker-type"] = "/".join([provisioner_id, worker_type])
+        project = config.params["project"]
+
+        routes = task.get("routes", [])
+        scopes = [
+            s.format(level=level, project=project) for s in task.get("scopes", [])
+        ]
+
+        # set up extra
+        extra = task.get("extra", {})
+        extra["parent"] = {"task-reference": "<decision>"}
+        task_th = task.get("treeherder")
+        if task_th:
+            extra.setdefault("treeherder-platform", task_th["platform"])
+            treeherder = extra.setdefault("treeherder", {})
+
+            machine_platform, collection = task_th["platform"].split("/", 1)
+            treeherder["machine"] = {"platform": machine_platform}
+            treeherder["collection"] = {collection: True}
+
+            group_names = config.graph_config["treeherder"]["group-names"]
+            groupSymbol, symbol = split_symbol(task_th["symbol"])
+            if groupSymbol != "?":
+                treeherder["groupSymbol"] = groupSymbol
+                if groupSymbol not in group_names:
+                    path = os.path.join(config.path, task.get("job-from", ""))
+                    raise Exception(UNKNOWN_GROUP_NAME.format(groupSymbol, path))
+                treeherder["groupName"] = group_names[groupSymbol]
+            treeherder["symbol"] = symbol
+            if len(symbol) > 25 or len(groupSymbol) > 25:
+                raise RuntimeError(
+                    "Treeherder group and symbol names must not be longer than "
+                    "25 characters: {} (see {})".format(
+                        task_th["symbol"],
+                        TC_TREEHERDER_SCHEMA_URL,
+                    )
+                )
+            treeherder["jobKind"] = task_th["kind"]
+            treeherder["tier"] = task_th["tier"]
+
+            branch_rev = get_branch_rev(config)
+
+            routes.append(
+                "{}.v2.{}.{}".format(
+                    TREEHERDER_ROUTE_ROOT,
+                    config.params["project"],
+                    branch_rev,
+                )
+            )
+
+        if "deadline-after" not in task:
+            task["deadline-after"] = "1 day"
+
+        if "priority" not in task:
+            task["priority"] = get_default_priority(
+                config.graph_config, config.params["project"]
+            )
+
+        tags = task.get("tags", {})
+        attributes = task.get("attributes", {})
+
+        tags.update(
+            {
+                "createdForUser": config.params["owner"],
+                "kind": config.kind,
+                "label": task["label"],
+                "retrigger": "true" if attributes.get("retrigger", False) else "false",
+            }
+        )
+
+        task_def = {
+            "provisionerId": provisioner_id,
+            "workerType": worker_type,
+            "routes": routes,
+            "created": {"relative-datestamp": "0 seconds"},
+            "deadline": {"relative-datestamp": task["deadline-after"]},
+            "expires": {"relative-datestamp": task["expires-after"]},
+            "scopes": scopes,
+            "metadata": {
+                "description": task["description"],
+                "name": task["label"],
+                "owner": config.params["owner"],
+                "source": config.params.file_url(config.path, pretty=True),
+            },
+            "extra": extra,
+            "tags": tags,
+            "priority": task["priority"],
+        }
+
+        if task.get("requires", None):
+            task_def["requires"] = task["requires"]
+
+        if task_th:
+            # link back to treeherder in description
+            th_job_link = (
+                "https://treeherder.mozilla.org/#/jobs?repo={}&revision={}&selectedTaskRun=<self>"
+            ).format(config.params["project"], branch_rev)
+            task_def["metadata"]["description"] = {
+                "task-reference": "{description} ([Treeherder job]({th_job_link}))".format(
+                    description=task_def["metadata"]["description"],
+                    th_job_link=th_job_link,
+                )
+            }
+
+        # add the payload and adjust anything else as required (e.g., scopes)
+        payload_builders[task["worker"]["implementation"]].builder(
+            config, task, task_def
+        )
+
+        # Resolve run-on-projects
+        build_platform = attributes.get("build_platform")
+        resolve_keyed_by(
+            task,
+            "run-on-projects",
+            item_name=task["label"],
+            **{"build-platform": build_platform},
+        )
+        attributes["run_on_projects"] = task.get("run-on-projects", ["all"])
+        attributes["always_target"] = task["always-target"]
+        # This logic is here since downstream tasks don't always match their
+        # upstream dependency's shipping_phase.
+        # A text_type task['shipping-phase'] takes precedence, then
+        # an existing attributes['shipping_phase'], then fall back to None.
+        if task.get("shipping-phase") is not None:
+            attributes["shipping_phase"] = task["shipping-phase"]
+        else:
+            attributes.setdefault("shipping_phase", None)
+        # shipping_product will always match the upstream task's
+        # shipping_product, so a pre-set existing attributes['shipping_product']
+        # takes precedence over task['shipping-product']. However, make sure
+        # we don't have conflicting values.
+        if task.get("shipping-product") and attributes.get("shipping_product") not in (
+            None,
+            task["shipping-product"],
+        ):
+            raise Exception(
+                "{} shipping_product {} doesn't match task shipping-product {}!".format(
+                    task["label"],
+                    attributes["shipping_product"],
+                    task["shipping-product"],
+                )
+            )
+        attributes.setdefault("shipping_product", task["shipping-product"])
+
+        # Set MOZ_AUTOMATION on all jobs.
+        if task["worker"]["implementation"] in (
+            "generic-worker",
+            "docker-worker",
+        ):
+            payload = task_def.get("payload")
+            if payload:
+                env = payload.setdefault("env", {})
+                env["MOZ_AUTOMATION"] = "1"
+
+        dependencies = task.get("dependencies", {})
+        if_dependencies = task.get("if-dependencies", [])
+        if if_dependencies:
+            for i, dep in enumerate(if_dependencies):
+                if dep in dependencies:
+                    if_dependencies[i] = dependencies[dep]
+                    continue
+
+                raise Exception(
+                    "{label} specifies '{dep}' in if-dependencies, "
+                    "but {dep} is not a dependency!".format(
+                        label=task["label"], dep=dep
+                    )
+                )
+
+        yield {
+            "label": task["label"],
+            "description": task["description"],
+            "task": task_def,
+            "dependencies": dependencies,
+            "if-dependencies": if_dependencies,
+            "soft-dependencies": task.get("soft-dependencies", []),
+            "attributes": attributes,
+            "optimization": task.get("optimization", None),
+        }
+
+
+@transforms.add
+def chain_of_trust(config, tasks):
+    for task in tasks:
+        if task["task"].get("payload", {}).get("features", {}).get("chainOfTrust"):
+            image = task.get("dependencies", {}).get("docker-image")
+            if image:
+                cot = (
+                    task["task"].setdefault("extra", {}).setdefault("chainOfTrust", {})
+                )
+                cot.setdefault("inputs", {})["docker-image"] = {
+                    "task-reference": "<docker-image>"
+                }
+        yield task
+
+
+@transforms.add
+def check_task_identifiers(config, tasks):
+    """Ensures that all tasks have well defined identifiers:
+    ``^[a-zA-Z0-9_-]{1,38}$``
+    """
+    e = re.compile("^[a-zA-Z0-9_-]{1,38}$")
+    for task in tasks:
+        for attrib in ("workerType", "provisionerId"):
+            if not e.match(task["task"][attrib]):
+                raise Exception(
+                    "task {}.{} is not a valid identifier: {}".format(
+                        task["label"], attrib, task["task"][attrib]
+                    )
+                )
+        yield task
+
+
+@transforms.add
+def check_task_dependencies(config, tasks):
+    """Ensures that tasks don't have more than 100 dependencies."""
+    for task in tasks:
+        if len(task["dependencies"]) > MAX_DEPENDENCIES:
+            raise Exception(
+                "task {}/{} has too many dependencies ({} > {})".format(
+                    config.kind,
+                    task["label"],
+                    len(task["dependencies"]),
+                    MAX_DEPENDENCIES,
+                )
+            )
+        yield task
+
+
+def check_caches_are_volumes(task):
+    """Ensures that all cache paths are defined as volumes.
+
+    Caches and volumes are the only filesystem locations whose content
+    isn't defined by the Docker image itself. Some caches are optional
+    depending on the job environment. We want paths that are potentially
+    caches to have as similar behavior regardless of whether a cache is
+    used. To help enforce this, we require that all paths used as caches
+    to be declared as Docker volumes. This check won't catch all offenders.
+    But it is better than nothing.
+    """
+    volumes = {s for s in task["worker"]["volumes"]}
+    paths = {c["mount-point"] for c in task["worker"].get("caches", [])}
+    missing = paths - volumes
+
+    if not missing:
+        return
+
+    raise Exception(
+        "task %s (image %s) has caches that are not declared as "
+        "Docker volumes: %s "
+        "(have you added them as VOLUMEs in the Dockerfile?)"
+        % (task["label"], task["worker"]["docker-image"], ", ".join(sorted(missing)))
+    )
+
+
+def check_required_volumes(task):
+    """
+    Ensures that all paths that are required to be volumes are defined as volumes.
+
+    Performance of writing to files in poor in directories not marked as
+    volumes, in docker. Ensure that paths that are often written to are marked
+    as volumes.
+    """
+    volumes = set(task["worker"]["volumes"])
+    paths = set(task["worker"].get("required-volumes", []))
+    missing = paths - volumes
+
+    if not missing:
+        return
+
+    raise Exception(
+        "task %s (image %s) has paths that should be volumes for peformance "
+        "that are not declared as Docker volumes: %s "
+        "(have you added them as VOLUMEs in the Dockerfile?)"
+        % (task["label"], task["worker"]["docker-image"], ", ".join(sorted(missing)))
+    )
+
+
+@transforms.add
+def check_run_task_caches(config, tasks):
+    """Audit for caches requiring run-task.
+
+    run-task manages caches in certain ways. If a cache managed by run-task
+    is used by a non run-task task, it could cause problems. So we audit for
+    that and make sure certain cache names are exclusive to run-task.
+
+    IF YOU ARE TEMPTED TO MAKE EXCLUSIONS TO THIS POLICY, YOU ARE LIKELY
+    CONTRIBUTING TECHNICAL DEBT AND WILL HAVE TO SOLVE MANY OF THE PROBLEMS
+    THAT RUN-TASK ALREADY SOLVES. THINK LONG AND HARD BEFORE DOING THAT.
+    """
+    re_reserved_caches = re.compile(
+        """^
+        (checkouts|tooltool-cache)
+    """,
+        re.VERBOSE,
+    )
+
+    re_sparse_checkout_cache = re.compile("^checkouts-sparse")
+
+    cache_prefix = "{trust_domain}-level-{level}-".format(
+        trust_domain=config.graph_config["trust-domain"],
+        level=config.params["level"],
+    )
+
+    suffix = _run_task_suffix()
+
+    for task in tasks:
+        payload = task["task"].get("payload", {})
+        command = payload.get("command") or [""]
+
+        main_command = command[0] if isinstance(command[0], str) else ""
+        run_task = main_command.endswith("run-task")
+
+        require_sparse_cache = False
+        have_sparse_cache = False
+
+        if run_task:
+            for arg in command[1:]:
+                if not isinstance(arg, str):
+                    continue
+
+                if arg == "--":
+                    break
+
+                if arg.startswith("--gecko-sparse-profile"):
+                    if "=" not in arg:
+                        raise Exception(
+                            "{} is specifying `--gecko-sparse-profile` to run-task "
+                            "as two arguments. Unable to determine if the sparse "
+                            "profile exists.".format(task["label"])
+                        )
+                    _, sparse_profile = arg.split("=", 1)
+                    if not os.path.exists(os.path.join(GECKO, sparse_profile)):
+                        raise Exception(
+                            "{} is using non-existant sparse profile {}.".format(
+                                task["label"], sparse_profile
+                            )
+                        )
+                    require_sparse_cache = True
+                    break
+
+        for cache in payload.get("cache", {}):
+            if not cache.startswith(cache_prefix):
+                raise Exception(
+                    "{} is using a cache ({}) which is not appropriate "
+                    "for its trust-domain and level. It should start with {}.".format(
+                        task["label"], cache, cache_prefix
+                    )
+                )
+
+            cache = cache[len(cache_prefix) :]
+
+            if re_sparse_checkout_cache.match(cache):
+                have_sparse_cache = True
+
+            if not re_reserved_caches.match(cache):
+                continue
+
+            if not run_task:
+                raise Exception(
+                    "%s is using a cache (%s) reserved for run-task "
+                    "change the task to use run-task or use a different "
+                    "cache name" % (task["label"], cache)
+                )
+
+            if not cache.endswith(suffix):
+                raise Exception(
+                    "%s is using a cache (%s) reserved for run-task "
+                    "but the cache name is not dependent on the contents "
+                    "of run-task; change the cache name to conform to the "
+                    "naming requirements" % (task["label"], cache)
+                )
+
+        if require_sparse_cache and not have_sparse_cache:
+            raise Exception(
+                "%s is using a sparse checkout but not using "
+                "a sparse checkout cache; change the checkout "
+                "cache name so it is sparse aware" % task["label"]
+            )
+
+        yield task
diff --git a/taskcluster/gecko_taskgraph/transforms/test/__init__.py b/taskcluster/gecko_taskgraph/transforms/test/__init__.py
new file mode 100644
index 0000000000..ac17554baa
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/test/__init__.py
@@ -0,0 +1,538 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+These transforms construct a task description to run the given test, based on a
+test description.  The implementation here is shared among all test kinds, but
+contains specific support for how we run tests in Gecko (via mozharness,
+invoked in particular ways).
+
+This is a good place to translate a test-description option such as
+`single-core: true` to the implementation of that option in a task description
+(worker options, mozharness commandline, environment variables, etc.)
+
+The test description should be fully formed by the time it reaches these
+transforms, and these transforms should not embody any specific knowledge about
+what should run where. this is the wrong place for special-casing platforms,
+for example - use `all_tests.py` instead.
+"""
+
+
+import logging
+from importlib import import_module
+
+from mozbuild.schedules import INCLUSIVE_COMPONENTS
+from taskgraph.transforms.base import TransformSequence
+from taskgraph.util.schema import Schema, optionally_keyed_by, resolve_keyed_by
+from voluptuous import Any, Exclusive, Optional, Required
+
+from gecko_taskgraph.optimize.schema import OptimizationSchema
+from gecko_taskgraph.transforms.test.other import get_mobile_project
+from gecko_taskgraph.util.chunking import manifest_loaders
+
+logger = logging.getLogger(__name__)
+transforms = TransformSequence()
+
+
+# Schema for a test description
+#
+# *****WARNING*****
+#
+# This is a great place for baffling cruft to accumulate, and that makes
+# everyone move more slowly.  Be considerate of your fellow hackers!
+# See the warnings in taskcluster/docs/how-tos.rst
+#
+# *****WARNING*****
+test_description_schema = Schema(
+    {
+        # description of the suite, for the task metadata
+        Required("description"): str,
+        # test suite category and name
+        Optional("suite"): Any(
+            optionally_keyed_by("variant", str),
+            {
+                Optional("category"): str,
+                Optional("name"): optionally_keyed_by("variant", str),
+            },
+        ),
+        # base work directory used to set up the task.
+        Optional("workdir"): optionally_keyed_by("test-platform", Any(str, "default")),
+        # the name by which this test suite is addressed in try syntax; defaults to
+        # the test-name.  This will translate to the `unittest_try_name` or
+        # `talos_try_name` attribute.
+        Optional("try-name"): str,
+        # additional tags to mark up this type of test
+        Optional("tags"): {str: object},
+        # the symbol, or group(symbol), under which this task should appear in
+        # treeherder.
+        Required("treeherder-symbol"): str,
+        # the value to place in task.extra.treeherder.machine.platform; ideally
+        # this is the same as build-platform, and that is the default, but in
+        # practice it's not always a match.
+        Optional("treeherder-machine-platform"): str,
+        # attributes to appear in the resulting task (later transforms will add the
+        # common attributes)
+        Optional("attributes"): {str: object},
+        # relative path (from config.path) to the file task was defined in
+        Optional("job-from"): str,
+        # The `run_on_projects` attribute, defaulting to "all".  This dictates the
+        # projects on which this task should be included in the target task set.
+        # See the attributes documentation for details.
+        #
+        # Note that the special case 'built-projects', the default, uses the parent
+        # build task's run-on-projects, meaning that tests run only on platforms
+        # that are built.
+        Optional("run-on-projects"): optionally_keyed_by(
+            "app",
+            "subtest",
+            "test-platform",
+            "test-name",
+            "variant",
+            Any([str], "built-projects"),
+        ),
+        # When set only run on projects where the build would already be running.
+        # This ensures tasks where this is True won't be the cause of the build
+        # running on a project it otherwise wouldn't have.
+        Optional("built-projects-only"): bool,
+        # the sheriffing tier for this task (default: set based on test platform)
+        Optional("tier"): optionally_keyed_by(
+            "test-platform", "variant", "app", "subtest", Any(int, "default")
+        ),
+        # number of chunks to create for this task.  This can be keyed by test
+        # platform by passing a dictionary in the `by-test-platform` key.  If the
+        # test platform is not found, the key 'default' will be tried.
+        Required("chunks"): optionally_keyed_by(
+            "test-platform", "variant", Any(int, "dynamic")
+        ),
+        # Custom 'test_manifest_loader' to use, overriding the one configured in the
+        # parameters. When 'null', no test chunking will be performed. Can also
+        # be used to disable "manifest scheduling".
+        Optional("test-manifest-loader"): Any(None, *list(manifest_loaders)),
+        # the time (with unit) after which this task is deleted; default depends on
+        # the branch (see below)
+        Optional("expires-after"): str,
+        # The different configurations that should be run against this task, defined
+        # in the TEST_VARIANTS object in the variant.py transforms.
+        Optional("variants"): [str],
+        # Whether to run this task without any variants applied.
+        Required("run-without-variant"): optionally_keyed_by("test-platform", bool),
+        # The EC2 instance size to run these tests on.
+        Required("instance-size"): optionally_keyed_by(
+            "test-platform", Any("default", "large", "xlarge")
+        ),
+        # type of virtualization or hardware required by test.
+        Required("virtualization"): optionally_keyed_by(
+            "test-platform", Any("virtual", "virtual-with-gpu", "hardware")
+        ),
+        # Whether the task requires loopback audio or video (whatever that may mean
+        # on the platform)
+        Required("loopback-audio"): bool,
+        Required("loopback-video"): bool,
+        # Whether the test can run using a software GL implementation on Linux
+        # using the GL compositor. May not be used with "legacy" sized instances
+        # due to poor LLVMPipe performance (bug 1296086).  Defaults to true for
+        # unit tests on linux platforms and false otherwise
+        Optional("allow-software-gl-layers"): bool,
+        # For tasks that will run in docker-worker, this is the
+        # name of the docker image or in-tree docker image to run the task in.  If
+        # in-tree, then a dependency will be created automatically.  This is
+        # generally `desktop-test`, or an image that acts an awful lot like it.
+        Required("docker-image"): optionally_keyed_by(
+            "test-platform",
+            Any(
+                # a raw Docker image path (repo/image:tag)
+                str,
+                # an in-tree generated docker image (from `taskcluster/docker/<name>`)
+                {"in-tree": str},
+                # an indexed docker image
+                {"indexed": str},
+            ),
+        ),
+        # seconds of runtime after which the task will be killed.  Like 'chunks',
+        # this can be keyed by test platform, but also variant.
+        Required("max-run-time"): optionally_keyed_by(
+            "test-platform", "subtest", "variant", "app", int
+        ),
+        # the exit status code that indicates the task should be retried
+        Optional("retry-exit-status"): [int],
+        # Whether to perform a gecko checkout.
+        Required("checkout"): bool,
+        # Wheter to perform a machine reboot after test is done
+        Optional("reboot"): Any(False, "always", "on-exception", "on-failure"),
+        # What to run
+        Required("mozharness"): {
+            # the mozharness script used to run this task
+            Required("script"): optionally_keyed_by("test-platform", str),
+            # the config files required for the task
+            Required("config"): optionally_keyed_by("test-platform", [str]),
+            # mochitest flavor for mochitest runs
+            Optional("mochitest-flavor"): str,
+            # any additional actions to pass to the mozharness command
+            Optional("actions"): [str],
+            # additional command-line options for mozharness, beyond those
+            # automatically added
+            Required("extra-options"): optionally_keyed_by("test-platform", [str]),
+            # the artifact name (including path) to test on the build task; this is
+            # generally set in a per-kind transformation
+            Optional("build-artifact-name"): str,
+            Optional("installer-url"): str,
+            # If not false, tooltool downloads will be enabled via relengAPIProxy
+            # for either just public files, or all files.  Not supported on Windows
+            Required("tooltool-downloads"): Any(
+                False,
+                "public",
+                "internal",
+            ),
+            # Add --blob-upload-branch=<project> mozharness parameter
+            Optional("include-blob-upload-branch"): bool,
+            # The setting for --download-symbols (if omitted, the option will not
+            # be passed to mozharness)
+            Optional("download-symbols"): Any(True, "ondemand"),
+            # If set, then MOZ_NODE_PATH=/usr/local/bin/node is included in the
+            # environment.  This is more than just a helpful path setting -- it
+            # causes xpcshell tests to start additional servers, and runs
+            # additional tests.
+            Required("set-moz-node-path"): bool,
+            # If true, include chunking information in the command even if the number
+            # of chunks is 1
+            Required("chunked"): optionally_keyed_by("test-platform", bool),
+            Required("requires-signed-builds"): optionally_keyed_by(
+                "test-platform", "variant", bool
+            ),
+        },
+        # The set of test manifests to run.
+        Optional("test-manifests"): Any(
+            [str],
+            {"active": [str], "skipped": [str]},
+        ),
+        # The current chunk (if chunking is enabled).
+        Optional("this-chunk"): int,
+        # os user groups for test task workers; required scopes, will be
+        # added automatically
+        Optional("os-groups"): optionally_keyed_by("test-platform", [str]),
+        Optional("run-as-administrator"): optionally_keyed_by("test-platform", bool),
+        # -- values supplied by the task-generation infrastructure
+        # the platform of the build this task is testing
+        Required("build-platform"): str,
+        # the label of the build task generating the materials to test
+        Required("build-label"): str,
+        # the label of the signing task generating the materials to test.
+        # Signed builds are used in xpcshell tests on Windows, for instance.
+        Optional("build-signing-label"): optionally_keyed_by("variant", str),
+        # the build's attributes
+        Required("build-attributes"): {str: object},
+        # the platform on which the tests will run
+        Required("test-platform"): str,
+        # limit the test-platforms (as defined in test-platforms.yml)
+        # that the test will run on
+        Optional("limit-platforms"): optionally_keyed_by("app", "subtest", [str]),
+        # the name of the test (the key in tests.yml)
+        Required("test-name"): str,
+        # the product name, defaults to firefox
+        Optional("product"): str,
+        # conditional files to determine when these tests should be run
+        Exclusive("when", "optimization"): {
+            Optional("files-changed"): [str],
+        },
+        # Optimization to perform on this task during the optimization phase.
+        # Optimizations are defined in taskcluster/gecko_taskgraph/optimize.py.
+        Exclusive("optimization", "optimization"): OptimizationSchema,
+        # The SCHEDULES component for this task; this defaults to the suite
+        # (not including the flavor) but can be overridden here.
+        Exclusive("schedules-component", "optimization"): Any(
+            str,
+            [str],
+        ),
+        Optional("worker-type"): optionally_keyed_by(
+            "test-platform",
+            Any(str, None),
+        ),
+        Optional(
+            "require-signed-extensions",
+            description="Whether the build being tested requires extensions be signed.",
+        ): optionally_keyed_by("release-type", "test-platform", bool),
+        # The target name, specifying the build artifact to be tested.
+        # If None or not specified, a transform sets the target based on OS:
+        # target.dmg (Mac), target.apk (Android), target.tar.bz2 (Linux),
+        # or target.zip (Windows).
+        Optional("target"): optionally_keyed_by(
+            "app",
+            "test-platform",
+            "variant",
+            Any(
+                str,
+                None,
+                {Required("index"): str, Required("name"): str},
+            ),
+        ),
+        # A list of artifacts to install from 'fetch' tasks. Validation deferred
+        # to 'job' transforms.
+        Optional("fetches"): object,
+        # Raptor / browsertime specific keys, defer validation to 'raptor.py'
+        # transform.
+        Optional("raptor"): object,
+        # Raptor / browsertime specific keys that need to be here since 'raptor' schema
+        # is evluated *before* test_description_schema
+        Optional("app"): str,
+        Optional("subtest"): str,
+        # Define if a given task supports artifact builds or not, see bug 1695325.
+        Optional("supports-artifact-builds"): bool,
+    }
+)
+
+
+@transforms.add
+def handle_keyed_by_mozharness(config, tasks):
+    """Resolve a mozharness field if it is keyed by something"""
+    fields = [
+        "mozharness",
+        "mozharness.chunked",
+        "mozharness.config",
+        "mozharness.extra-options",
+        "mozharness.script",
+    ]
+    for task in tasks:
+        for field in fields:
+            resolve_keyed_by(
+                task,
+                field,
+                item_name=task["test-name"],
+                enforce_single_match=False,
+            )
+        yield task
+
+
+@transforms.add
+def set_defaults(config, tasks):
+    for task in tasks:
+        build_platform = task["build-platform"]
+        if build_platform.startswith("android"):
+            # all Android test tasks download internal objects from tooltool
+            task["mozharness"]["tooltool-downloads"] = "internal"
+            task["mozharness"]["actions"] = ["get-secrets"]
+
+            # loopback-video is always true for Android, but false for other
+            # platform phyla
+            task["loopback-video"] = True
+        task["mozharness"]["set-moz-node-path"] = True
+
+        # software-gl-layers is only meaningful on linux unittests, where it defaults to True
+        if task["test-platform"].startswith("linux") and task["suite"] not in [
+            "talos",
+            "raptor",
+        ]:
+            task.setdefault("allow-software-gl-layers", True)
+        else:
+            task["allow-software-gl-layers"] = False
+
+        task.setdefault("try-name", task["test-name"])
+        task.setdefault("os-groups", [])
+        task.setdefault("run-as-administrator", False)
+        task.setdefault("chunks", 1)
+        task.setdefault("run-on-projects", "built-projects")
+        task.setdefault("built-projects-only", False)
+        task.setdefault("instance-size", "default")
+        task.setdefault("max-run-time", 3600)
+        task.setdefault("reboot", False)
+        task.setdefault("virtualization", "virtual")
+        task.setdefault("loopback-audio", False)
+        task.setdefault("loopback-video", False)
+        task.setdefault("limit-platforms", [])
+        task.setdefault("docker-image", {"in-tree": "ubuntu1804-test"})
+        task.setdefault("checkout", False)
+        task.setdefault("require-signed-extensions", False)
+        task.setdefault("run-without-variant", True)
+        task.setdefault("variants", [])
+        task.setdefault("supports-artifact-builds", True)
+
+        task["mozharness"].setdefault("extra-options", [])
+        task["mozharness"].setdefault("requires-signed-builds", False)
+        task["mozharness"].setdefault("tooltool-downloads", "public")
+        task["mozharness"].setdefault("set-moz-node-path", False)
+        task["mozharness"].setdefault("chunked", False)
+        yield task
+
+
+transforms.add_validate(test_description_schema)
+
+
+@transforms.add
+def run_variant_transforms(config, tasks):
+    """Variant transforms are run as soon as possible to allow other transforms
+    to key by variant."""
+    for task in tasks:
+        xforms = TransformSequence()
+        mod = import_module("gecko_taskgraph.transforms.test.variant")
+        xforms.add(mod.transforms)
+
+        yield from xforms(config, [task])
+
+
+@transforms.add
+def resolve_keys(config, tasks):
+    keys = ("require-signed-extensions", "run-without-variant", "suite", "suite.name")
+    for task in tasks:
+        for key in keys:
+            resolve_keyed_by(
+                task,
+                key,
+                item_name=task["test-name"],
+                enforce_single_match=False,
+                **{
+                    "release-type": config.params["release_type"],
+                    "variant": task["attributes"].get("unittest_variant"),
+                },
+            )
+        yield task
+
+
+@transforms.add
+def run_remaining_transforms(config, tasks):
+    """Runs other transform files next to this module."""
+    # List of modules to load transforms from in order.
+    transform_modules = (
+        ("raptor", lambda t: t["suite"] == "raptor"),
+        ("other", None),
+        ("worker", None),
+        # These transforms should always run last as there is never any
+        # difference in configuration from one chunk to another (other than
+        # chunk number).
+        ("chunk", None),
+    )
+
+    for task in tasks:
+        xforms = TransformSequence()
+        for name, filterfn in transform_modules:
+            if filterfn and not filterfn(task):
+                continue
+
+            mod = import_module(f"gecko_taskgraph.transforms.test.{name}")
+            xforms.add(mod.transforms)
+
+        yield from xforms(config, [task])
+
+
+@transforms.add
+def make_job_description(config, tasks):
+    """Convert *test* descriptions to *job* descriptions (input to
+    gecko_taskgraph.transforms.job)"""
+
+    for task in tasks:
+        attributes = task.get("attributes", {})
+
+        mobile = get_mobile_project(task)
+        if mobile and (mobile not in task["test-name"]):
+            label = "{}-{}-{}-{}".format(
+                config.kind, task["test-platform"], mobile, task["test-name"]
+            )
+        else:
+            label = "{}-{}-{}".format(
+                config.kind, task["test-platform"], task["test-name"]
+            )
+
+        try_name = task["try-name"]
+        if attributes.get("unittest_variant"):
+            suffix = task.pop("variant-suffix")
+            label += suffix
+            try_name += suffix
+
+        if task["chunks"] > 1:
+            label += "-{}".format(task["this-chunk"])
+
+        build_label = task["build-label"]
+
+        if task["suite"] == "talos":
+            attr_try_name = "talos_try_name"
+        elif task["suite"] == "raptor":
+            attr_try_name = "raptor_try_name"
+        else:
+            attr_try_name = "unittest_try_name"
+
+        attr_build_platform, attr_build_type = task["build-platform"].split("/", 1)
+        attributes.update(
+            {
+                "build_platform": attr_build_platform,
+                "build_type": attr_build_type,
+                "test_platform": task["test-platform"],
+                "test_chunk": str(task["this-chunk"]),
+                "supports-artifact-builds": task["supports-artifact-builds"],
+                attr_try_name: try_name,
+            }
+        )
+
+        if "test-manifests" in task:
+            attributes["test_manifests"] = task["test-manifests"]
+
+        jobdesc = {}
+        name = "{}-{}".format(task["test-platform"], task["test-name"])
+        jobdesc["name"] = name
+        jobdesc["label"] = label
+        jobdesc["description"] = task["description"]
+        jobdesc["attributes"] = attributes
+        jobdesc["dependencies"] = {"build": build_label}
+        jobdesc["job-from"] = task["job-from"]
+
+        if task.get("fetches"):
+            jobdesc["fetches"] = task["fetches"]
+
+        if task["mozharness"]["requires-signed-builds"] is True:
+            jobdesc["dependencies"]["build-signing"] = task["build-signing-label"]
+
+        if "expires-after" in task:
+            jobdesc["expires-after"] = task["expires-after"]
+
+        jobdesc["routes"] = []
+        jobdesc["run-on-projects"] = sorted(task["run-on-projects"])
+        jobdesc["scopes"] = []
+        jobdesc["tags"] = task.get("tags", {})
+        jobdesc["extra"] = {
+            "chunks": {
+                "current": task["this-chunk"],
+                "total": task["chunks"],
+            },
+            "suite": attributes["unittest_suite"],
+            "test-setting": task.pop("test-setting"),
+        }
+        jobdesc["treeherder"] = {
+            "symbol": task["treeherder-symbol"],
+            "kind": "test",
+            "tier": task["tier"],
+            "platform": task.get("treeherder-machine-platform", task["build-platform"]),
+        }
+
+        schedules = task.get("schedules-component", [])
+        if task.get("when"):
+            # This may still be used by comm-central.
+            jobdesc["when"] = task["when"]
+        elif "optimization" in task:
+            jobdesc["optimization"] = task["optimization"]
+        elif set(schedules) & set(INCLUSIVE_COMPONENTS):
+            jobdesc["optimization"] = {"test-inclusive": schedules}
+        else:
+            jobdesc["optimization"] = {"test": schedules}
+
+        run = jobdesc["run"] = {}
+        run["using"] = "mozharness-test"
+        run["test"] = task
+
+        if "workdir" in task:
+            run["workdir"] = task.pop("workdir")
+
+        jobdesc["worker-type"] = task.pop("worker-type")
+
+        if "worker" in task:
+            jobdesc["worker"] = task.pop("worker")
+
+        if task.get("fetches"):
+            jobdesc["fetches"] = task.pop("fetches")
+
+        yield jobdesc
+
+
+def normpath(path):
+    return path.replace("/", "\\")
+
+
+def get_firefox_version():
+    with open("browser/config/version.txt") as f:
+        return f.readline().strip()
diff --git a/taskcluster/gecko_taskgraph/transforms/test/chunk.py b/taskcluster/gecko_taskgraph/transforms/test/chunk.py
new file mode 100644
index 0000000000..f6442e3755
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/test/chunk.py
@@ -0,0 +1,262 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import json
+
+import taskgraph
+from taskgraph.transforms.base import TransformSequence
+from taskgraph.util.attributes import keymatch
+from taskgraph.util.treeherder import join_symbol, split_symbol
+
+from gecko_taskgraph.util.attributes import is_try
+from gecko_taskgraph.util.chunking import (
+    DefaultLoader,
+    chunk_manifests,
+    get_manifest_loader,
+    get_runtimes,
+    guess_mozinfo_from_task,
+)
+from gecko_taskgraph.util.copy_task import copy_task
+from gecko_taskgraph.util.perfile import perfile_number_of_chunks
+
+DYNAMIC_CHUNK_DURATION = 20 * 60  # seconds
+"""The approximate time each test chunk should take to run."""
+
+
+DYNAMIC_CHUNK_MULTIPLIER = {
+    # Desktop xpcshell tests run in parallel. Reduce the total runtime to
+    # compensate.
+    "^(?!android).*-xpcshell.*": 0.2,
+}
+"""A multiplication factor to tweak the total duration per platform / suite."""
+
+
+transforms = TransformSequence()
+
+
+@transforms.add
+def set_test_verify_chunks(config, tasks):
+    """Set the number of chunks we use for test-verify."""
+    for task in tasks:
+        if any(task["suite"].startswith(s) for s in ("test-verify", "test-coverage")):
+            env = config.params.get("try_task_config", {}) or {}
+            env = env.get("templates", {}).get("env", {})
+            task["chunks"] = perfile_number_of_chunks(
+                is_try(config.params),
+                env.get("MOZHARNESS_TEST_PATHS", ""),
+                config.params.get("head_repository", ""),
+                config.params.get("head_rev", ""),
+                task["test-name"],
+            )
+
+            # limit the number of chunks we run for test-verify mode because
+            # test-verify is comprehensive and takes a lot of time, if we have
+            # >30 tests changed, this is probably an import of external tests,
+            # or a patch renaming/moving files in bulk
+            maximum_number_verify_chunks = 3
+            if task["chunks"] > maximum_number_verify_chunks:
+                task["chunks"] = maximum_number_verify_chunks
+
+        yield task
+
+
+@transforms.add
+def set_test_manifests(config, tasks):
+    """Determine the set of test manifests that should run in this task."""
+
+    for task in tasks:
+        # When a task explicitly requests no 'test_manifest_loader', test
+        # resolving will happen at test runtime rather than in the taskgraph.
+        if "test-manifest-loader" in task and task["test-manifest-loader"] is None:
+            yield task
+            continue
+
+        # Set 'tests_grouped' to "1", so we can differentiate between suites that are
+        # chunked at the test runtime and those that are chunked in the taskgraph.
+        task.setdefault("tags", {})["tests_grouped"] = "1"
+
+        if taskgraph.fast:
+            # We want to avoid evaluating manifests when taskgraph.fast is set. But
+            # manifests are required for dynamic chunking. Just set the number of
+            # chunks to one in this case.
+            if task["chunks"] == "dynamic":
+                task["chunks"] = 1
+            yield task
+            continue
+
+        manifests = task.get("test-manifests")
+        if manifests:
+            if isinstance(manifests, list):
+                task["test-manifests"] = {"active": manifests, "skipped": []}
+            yield task
+            continue
+
+        mozinfo = guess_mozinfo_from_task(
+            task, config.params.get("head_repository", "")
+        )
+
+        loader_name = task.pop(
+            "test-manifest-loader", config.params["test_manifest_loader"]
+        )
+        loader = get_manifest_loader(loader_name, config.params)
+
+        task["test-manifests"] = loader.get_manifests(
+            task["suite"],
+            frozenset(mozinfo.items()),
+        )
+
+        # When scheduling with test paths, we often find manifests scheduled but all tests
+        # are skipped on a given config.  This will remove the task from the task set if
+        # no manifests have active tests for the given task/config
+        mh_test_paths = {}
+        if "MOZHARNESS_TEST_PATHS" in config.params.get("try_task_config", {}).get(
+            "env", {}
+        ):
+            mh_test_paths = json.loads(
+                config.params["try_task_config"]["env"]["MOZHARNESS_TEST_PATHS"]
+            )
+
+        if task["attributes"]["unittest_suite"] in mh_test_paths.keys():
+            input_paths = mh_test_paths[task["attributes"]["unittest_suite"]]
+            remaining_manifests = []
+
+            # if we have web-platform tests incoming, just yield task
+            for m in input_paths:
+                if m.startswith("testing/web-platform/tests/"):
+                    if not isinstance(loader, DefaultLoader):
+                        task["chunks"] = "dynamic"
+                    yield task
+                    break
+
+            # input paths can exist in other directories (i.e. [../../dir/test.js])
+            # we need to look for all [active] manifests that include tests in the path
+            for m in input_paths:
+                if [tm for tm in task["test-manifests"]["active"] if tm.startswith(m)]:
+                    remaining_manifests.append(m)
+
+            # look in the 'other' manifests
+            for m in input_paths:
+                man = m
+                for tm in task["test-manifests"]["other_dirs"]:
+                    matched_dirs = [
+                        dp
+                        for dp in task["test-manifests"]["other_dirs"].get(tm)
+                        if dp.startswith(man)
+                    ]
+                    if matched_dirs:
+                        if tm not in task["test-manifests"]["active"]:
+                            continue
+                        if m not in remaining_manifests:
+                            remaining_manifests.append(m)
+
+            if remaining_manifests == []:
+                continue
+
+        # The default loader loads all manifests. If we use a non-default
+        # loader, we'll only run some subset of manifests and the hardcoded
+        # chunk numbers will no longer be valid. Dynamic chunking should yield
+        # better results.
+        if not isinstance(loader, DefaultLoader):
+            task["chunks"] = "dynamic"
+
+        yield task
+
+
+@transforms.add
+def resolve_dynamic_chunks(config, tasks):
+    """Determine how many chunks are needed to handle the given set of manifests."""
+
+    for task in tasks:
+        if task["chunks"] != "dynamic":
+            yield task
+            continue
+
+        if not task.get("test-manifests"):
+            raise Exception(
+                "{} must define 'test-manifests' to use dynamic chunking!".format(
+                    task["test-name"]
+                )
+            )
+
+        runtimes = {
+            m: r
+            for m, r in get_runtimes(task["test-platform"], task["suite"]).items()
+            if m in task["test-manifests"]["active"]
+        }
+
+        # Truncate runtimes that are above the desired chunk duration. They
+        # will be assigned to a chunk on their own and the excess duration
+        # shouldn't cause additional chunks to be needed.
+        times = [min(DYNAMIC_CHUNK_DURATION, r) for r in runtimes.values()]
+        avg = round(sum(times) / len(times), 2) if times else 0
+        total = sum(times)
+
+        # If there are manifests missing from the runtimes data, fill them in
+        # with the average of all present manifests.
+        missing = [m for m in task["test-manifests"]["active"] if m not in runtimes]
+        total += avg * len(missing)
+
+        # Apply any chunk multipliers if found.
+        key = "{}-{}".format(task["test-platform"], task["test-name"])
+        matches = keymatch(DYNAMIC_CHUNK_MULTIPLIER, key)
+        if len(matches) > 1:
+            raise Exception(
+                "Multiple matching values for {} found while "
+                "determining dynamic chunk multiplier!".format(key)
+            )
+        elif matches:
+            total = total * matches[0]
+
+        chunks = int(round(total / DYNAMIC_CHUNK_DURATION))
+
+        # Make sure we never exceed the number of manifests, nor have a chunk
+        # length of 0.
+        task["chunks"] = min(chunks, len(task["test-manifests"]["active"])) or 1
+        yield task
+
+
+@transforms.add
+def split_chunks(config, tasks):
+    """Based on the 'chunks' key, split tests up into chunks by duplicating
+    them and assigning 'this-chunk' appropriately and updating the treeherder
+    symbol.
+    """
+
+    for task in tasks:
+        # If test-manifests are set, chunk them ahead of time to avoid running
+        # the algorithm more than once.
+        chunked_manifests = None
+        if "test-manifests" in task:
+            manifests = task["test-manifests"]
+            chunked_manifests = chunk_manifests(
+                task["suite"],
+                task["test-platform"],
+                task["chunks"],
+                manifests["active"],
+            )
+
+            # Add all skipped manifests to the first chunk of backstop pushes
+            # so they still show up in the logs. They won't impact runtime much
+            # and this way tools like ActiveData are still aware that they
+            # exist.
+            if config.params["backstop"] and manifests["active"]:
+                chunked_manifests[0].extend(manifests["skipped"])
+
+        for i in range(task["chunks"]):
+            this_chunk = i + 1
+
+            # copy the test and update with the chunk number
+            chunked = copy_task(task)
+            chunked["this-chunk"] = this_chunk
+
+            if chunked_manifests is not None:
+                chunked["test-manifests"] = sorted(chunked_manifests[i])
+
+            group, symbol = split_symbol(chunked["treeherder-symbol"])
+            if task["chunks"] > 1 or not symbol:
+                # add the chunk number to the TH symbol
+                symbol += str(this_chunk)
+                chunked["treeherder-symbol"] = join_symbol(group, symbol)
+
+            yield chunked
diff --git a/taskcluster/gecko_taskgraph/transforms/test/other.py b/taskcluster/gecko_taskgraph/transforms/test/other.py
new file mode 100644
index 0000000000..1c08d290e4
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/test/other.py
@@ -0,0 +1,1081 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import hashlib
+import json
+import re
+
+from mozbuild.schedules import INCLUSIVE_COMPONENTS
+from mozbuild.util import ReadOnlyDict
+from taskgraph.transforms.base import TransformSequence
+from taskgraph.util.attributes import keymatch
+from taskgraph.util.keyed_by import evaluate_keyed_by
+from taskgraph.util.schema import Schema, resolve_keyed_by
+from taskgraph.util.taskcluster import get_artifact_path, get_index_url
+from voluptuous import Any, Optional, Required
+
+from gecko_taskgraph.transforms.test.variant import TEST_VARIANTS
+from gecko_taskgraph.util.platforms import platform_family
+
+transforms = TransformSequence()
+
+
+@transforms.add
+def limit_platforms(config, tasks):
+    for task in tasks:
+        if not task["limit-platforms"]:
+            yield task
+            continue
+
+        limited_platforms = {key: key for key in task["limit-platforms"]}
+        if keymatch(limited_platforms, task["test-platform"]):
+            yield task
+
+
+@transforms.add
+def handle_suite_category(config, tasks):
+    for task in tasks:
+        task.setdefault("suite", {})
+
+        if isinstance(task["suite"], str):
+            task["suite"] = {"name": task["suite"]}
+
+        suite = task["suite"].setdefault("name", task["test-name"])
+        category = task["suite"].setdefault("category", suite)
+
+        task.setdefault("attributes", {})
+        task["attributes"]["unittest_suite"] = suite
+        task["attributes"]["unittest_category"] = category
+
+        script = task["mozharness"]["script"]
+        category_arg = None
+        if suite.startswith("test-verify") or suite.startswith("test-coverage"):
+            pass
+        elif script in ("android_emulator_unittest.py", "android_hardware_unittest.py"):
+            category_arg = "--test-suite"
+        elif script == "desktop_unittest.py":
+            category_arg = f"--{category}-suite"
+
+        if category_arg:
+            task["mozharness"].setdefault("extra-options", [])
+            extra = task["mozharness"]["extra-options"]
+            if not any(arg.startswith(category_arg) for arg in extra):
+                extra.append(f"{category_arg}={suite}")
+
+        # From here on out we only use the suite name.
+        task["suite"] = suite
+        yield task
+
+
+@transforms.add
+def setup_talos(config, tasks):
+    """Add options that are specific to talos jobs (identified by suite=talos)"""
+    for task in tasks:
+        if task["suite"] != "talos":
+            yield task
+            continue
+
+        extra_options = task.setdefault("mozharness", {}).setdefault(
+            "extra-options", []
+        )
+        extra_options.append("--use-talos-json")
+
+        # win7 needs to test skip
+        if task["build-platform"].startswith("win32"):
+            extra_options.append("--add-option")
+            extra_options.append("--setpref,gfx.direct2d.disabled=true")
+
+        if config.params.get("project", None):
+            extra_options.append("--project=%s" % config.params["project"])
+
+        yield task
+
+
+@transforms.add
+def setup_browsertime_flag(config, tasks):
+    """Optionally add `--browsertime` flag to Raptor pageload tests."""
+
+    browsertime_flag = config.params["try_task_config"].get("browsertime", False)
+
+    for task in tasks:
+        if not browsertime_flag or task["suite"] != "raptor":
+            yield task
+            continue
+
+        if task["treeherder-symbol"].startswith("Rap"):
+            # The Rap group is subdivided as Rap{-fenix,-refbrow(...),
+            # so `taskgraph.util.treeherder.replace_group` isn't appropriate.
+            task["treeherder-symbol"] = task["treeherder-symbol"].replace(
+                "Rap", "Btime", 1
+            )
+
+        extra_options = task.setdefault("mozharness", {}).setdefault(
+            "extra-options", []
+        )
+        extra_options.append("--browsertime")
+
+        yield task
+
+
+@transforms.add
+def handle_artifact_prefix(config, tasks):
+    """Handle translating `artifact_prefix` appropriately"""
+    for task in tasks:
+        if task["build-attributes"].get("artifact_prefix"):
+            task.setdefault("attributes", {}).setdefault(
+                "artifact_prefix", task["build-attributes"]["artifact_prefix"]
+            )
+        yield task
+
+
+@transforms.add
+def set_treeherder_machine_platform(config, tasks):
+    """Set the appropriate task.extra.treeherder.machine.platform"""
+    translation = {
+        # Linux64 build platform for asan is specified differently to
+        # treeherder.
+        "macosx1100-64/opt": "osx-1100/opt",
+        "macosx1100-64-shippable/opt": "osx-1100-shippable/opt",
+        "win64-asan/opt": "windows10-64/asan",
+        "win64-aarch64/opt": "windows10-aarch64/opt",
+    }
+    for task in tasks:
+        # For most desktop platforms, the above table is not used for "regular"
+        # builds, so we'll always pick the test platform here.
+        # On macOS though, the regular builds are in the table.  This causes a
+        # conflict in `verify_task_graph_symbol` once you add a new test
+        # platform based on regular macOS builds, such as for QR.
+        # Since it's unclear if the regular macOS builds can be removed from
+        # the table, workaround the issue for QR.
+        if "android" in task["test-platform"] and "pgo/opt" in task["test-platform"]:
+            platform_new = task["test-platform"].replace("-pgo/opt", "/pgo")
+            task["treeherder-machine-platform"] = platform_new
+        elif "android-em-7.0-x86_64-qr" in task["test-platform"]:
+            task["treeherder-machine-platform"] = task["test-platform"].replace(
+                ".", "-"
+            )
+        elif "android-em-7.0-x86_64-shippable-qr" in task["test-platform"]:
+            task["treeherder-machine-platform"] = task["test-platform"].replace(
+                ".", "-"
+            )
+        elif "android-em-7.0-x86_64-lite-qr" in task["test-platform"]:
+            task["treeherder-machine-platform"] = task["test-platform"].replace(
+                ".", "-"
+            )
+        elif "android-em-7.0-x86_64-shippable-lite-qr" in task["test-platform"]:
+            task["treeherder-machine-platform"] = task["test-platform"].replace(
+                ".", "-"
+            )
+        elif "-qr" in task["test-platform"]:
+            task["treeherder-machine-platform"] = task["test-platform"]
+        elif "android-hw" in task["test-platform"]:
+            task["treeherder-machine-platform"] = task["test-platform"]
+        elif "android-em-7.0-x86_64" in task["test-platform"]:
+            task["treeherder-machine-platform"] = task["test-platform"].replace(
+                ".", "-"
+            )
+        elif "android-em-7.0-x86" in task["test-platform"]:
+            task["treeherder-machine-platform"] = task["test-platform"].replace(
+                ".", "-"
+            )
+        # Bug 1602863 - must separately define linux64/asan and linux1804-64/asan
+        # otherwise causes an exception during taskgraph generation about
+        # duplicate treeherder platform/symbol.
+        elif "linux64-asan/opt" in task["test-platform"]:
+            task["treeherder-machine-platform"] = "linux64/asan"
+        elif "linux1804-asan/opt" in task["test-platform"]:
+            task["treeherder-machine-platform"] = "linux1804-64/asan"
+        else:
+            task["treeherder-machine-platform"] = translation.get(
+                task["build-platform"], task["test-platform"]
+            )
+        yield task
+
+
+@transforms.add
+def set_download_symbols(config, tasks):
+    """In general, we download symbols immediately for debug builds, but only
+    on demand for everything else. ASAN builds shouldn't download
+    symbols since they don't product symbol zips see bug 1283879"""
+    for task in tasks:
+        if task["test-platform"].split("/")[-1] == "debug":
+            task["mozharness"]["download-symbols"] = True
+        elif "asan" in task["build-platform"] or "tsan" in task["build-platform"]:
+            if "download-symbols" in task["mozharness"]:
+                del task["mozharness"]["download-symbols"]
+        else:
+            task["mozharness"]["download-symbols"] = "ondemand"
+        yield task
+
+
+@transforms.add
+def handle_keyed_by(config, tasks):
+    """Resolve fields that can be keyed by platform, etc."""
+    fields = [
+        "instance-size",
+        "docker-image",
+        "max-run-time",
+        "chunks",
+        "suite",
+        "run-on-projects",
+        "os-groups",
+        "run-as-administrator",
+        "workdir",
+        "worker-type",
+        "virtualization",
+        "fetches.fetch",
+        "fetches.toolchain",
+        "target",
+        "webrender-run-on-projects",
+        "mozharness.requires-signed-builds",
+        "build-signing-label",
+    ]
+    for task in tasks:
+        for field in fields:
+            resolve_keyed_by(
+                task,
+                field,
+                item_name=task["test-name"],
+                enforce_single_match=False,
+                project=config.params["project"],
+                variant=task["attributes"].get("unittest_variant"),
+            )
+        yield task
+
+
+@transforms.add
+def set_target(config, tasks):
+    for task in tasks:
+        build_platform = task["build-platform"]
+        target = None
+        if "target" in task:
+            target = task["target"]
+        if not target:
+            if build_platform.startswith("macosx"):
+                target = "target.dmg"
+            elif build_platform.startswith("android"):
+                target = "target.apk"
+            elif build_platform.startswith("win"):
+                target = "target.zip"
+            else:
+                target = "target.tar.bz2"
+
+        if isinstance(target, dict):
+            # TODO Remove hardcoded mobile artifact prefix
+            index_url = get_index_url(target["index"])
+            installer_url = "{}/artifacts/public/{}".format(index_url, target["name"])
+            task["mozharness"]["installer-url"] = installer_url
+        else:
+            task["mozharness"]["build-artifact-name"] = get_artifact_path(task, target)
+
+        yield task
+
+
+@transforms.add
+def setup_browsertime(config, tasks):
+    """Configure browsertime dependencies for Raptor pageload tests that have
+    `--browsertime` extra option."""
+
+    for task in tasks:
+        # We need to make non-trivial changes to various fetches, and our
+        # `by-test-platform` may not be "compatible" with existing
+        # `by-test-platform` filters.  Therefore we do everything after
+        # `handle_keyed_by` so that existing fields have been resolved down to
+        # simple lists.  But we use the `by-test-platform` machinery to express
+        # filters so that when the time comes to move browsertime into YAML
+        # files, the transition is straight-forward.
+        extra_options = task.get("mozharness", {}).get("extra-options", [])
+
+        if task["suite"] != "raptor" or "--webext" in extra_options:
+            yield task
+            continue
+
+        ts = {
+            "by-test-platform": {
+                "android.*": ["browsertime", "linux64-geckodriver", "linux64-node-16"],
+                "linux.*": ["browsertime", "linux64-geckodriver", "linux64-node-16"],
+                "macosx.*": ["browsertime", "macosx64-geckodriver", "macosx64-node-16"],
+                "windows.*aarch64.*": [
+                    "browsertime",
+                    "win32-geckodriver",
+                    "win32-node-16",
+                ],
+                "windows.*-32.*": ["browsertime", "win32-geckodriver", "win32-node-16"],
+                "windows.*-64.*": ["browsertime", "win64-geckodriver", "win64-node-16"],
+            },
+        }
+
+        task.setdefault("fetches", {}).setdefault("toolchain", []).extend(
+            evaluate_keyed_by(ts, "fetches.toolchain", task)
+        )
+
+        fs = {
+            "by-test-platform": {
+                "android.*": ["linux64-ffmpeg-4.4.1"],
+                "linux.*": ["linux64-ffmpeg-4.4.1"],
+                "macosx.*": ["mac64-ffmpeg-4.4.1"],
+                "windows.*aarch64.*": ["win64-ffmpeg-4.4.1"],
+                "windows.*-32.*": ["win64-ffmpeg-4.4.1"],
+                "windows.*-64.*": ["win64-ffmpeg-4.4.1"],
+            },
+        }
+
+        cd_fetches = {
+            "android.*": [
+                "linux64-chromedriver-109",
+                "linux64-chromedriver-110",
+                "linux64-chromedriver-111",
+                "linux64-chromedriver-112",
+                "linux64-chromedriver-113",
+                "linux64-chromedriver-114",
+            ],
+            "linux.*": [
+                "linux64-chromedriver-112",
+                "linux64-chromedriver-113",
+                "linux64-chromedriver-114",
+            ],
+            "macosx.*": [
+                "mac64-chromedriver-109",
+                "mac64-chromedriver-110",
+                "mac64-chromedriver-111",
+                "mac64-chromedriver-112",
+                "mac64-chromedriver-113",
+                "mac64-chromedriver-114",
+            ],
+            "windows.*aarch64.*": [
+                "win32-chromedriver-112",
+                "win32-chromedriver-113",
+                "win32-chromedriver-114",
+            ],
+            "windows.*-32.*": [
+                "win32-chromedriver-112",
+                "win32-chromedriver-113",
+                "win32-chromedriver-114",
+            ],
+            "windows.*-64.*": [
+                "win32-chromedriver-112",
+                "win32-chromedriver-113",
+                "win32-chromedriver-114",
+            ],
+        }
+
+        chromium_fetches = {
+            "linux.*": ["linux64-chromium"],
+            "macosx.*": ["mac-chromium"],
+            "windows.*aarch64.*": ["win32-chromium"],
+            "windows.*-32.*": ["win32-chromium"],
+            "windows.*-64.*": ["win64-chromium"],
+        }
+
+        cd_extracted_name = {
+            "windows": "{}chromedriver.exe",
+            "mac": "{}chromedriver",
+            "default": "{}chromedriver",
+        }
+
+        if "--app=chrome" in extra_options or "--app=chrome-m" in extra_options:
+            # Only add the chromedriver fetches when chrome is running
+            for platform in cd_fetches:
+                fs["by-test-platform"][platform].extend(cd_fetches[platform])
+        if "--app=chromium" in extra_options or "--app=custom-car" in extra_options:
+            for platform in chromium_fetches:
+                fs["by-test-platform"][platform].extend(chromium_fetches[platform])
+
+            # The chromedrivers for chromium are repackaged into the archives
+            # that we get the chromium binary from so we always have a compatible
+            # version.
+            cd_extracted_name = {
+                "windows": "chrome-win/chromedriver.exe",
+                "mac": "chrome-mac/chromedriver",
+                "default": "chrome-linux/chromedriver",
+            }
+
+        # Disable the Raptor install step
+        if "--app=chrome-m" in extra_options:
+            extra_options.append("--noinstall")
+
+        task.setdefault("fetches", {}).setdefault("fetch", []).extend(
+            evaluate_keyed_by(fs, "fetches.fetch", task)
+        )
+
+        extra_options.extend(
+            (
+                "--browsertime-browsertimejs",
+                "$MOZ_FETCHES_DIR/browsertime/node_modules/browsertime/bin/browsertime.js",
+            )
+        )  # noqa: E501
+
+        eos = {
+            "by-test-platform": {
+                "windows.*": [
+                    "--browsertime-node",
+                    "$MOZ_FETCHES_DIR/node/node.exe",
+                    "--browsertime-geckodriver",
+                    "$MOZ_FETCHES_DIR/geckodriver.exe",
+                    "--browsertime-chromedriver",
+                    "$MOZ_FETCHES_DIR/" + cd_extracted_name["windows"],
+                    "--browsertime-ffmpeg",
+                    "$MOZ_FETCHES_DIR/ffmpeg-4.4.1-full_build/bin/ffmpeg.exe",
+                ],
+                "macosx.*": [
+                    "--browsertime-node",
+                    "$MOZ_FETCHES_DIR/node/bin/node",
+                    "--browsertime-geckodriver",
+                    "$MOZ_FETCHES_DIR/geckodriver",
+                    "--browsertime-chromedriver",
+                    "$MOZ_FETCHES_DIR/" + cd_extracted_name["mac"],
+                    "--browsertime-ffmpeg",
+                    "$MOZ_FETCHES_DIR/ffmpeg-macos/ffmpeg",
+                ],
+                "default": [
+                    "--browsertime-node",
+                    "$MOZ_FETCHES_DIR/node/bin/node",
+                    "--browsertime-geckodriver",
+                    "$MOZ_FETCHES_DIR/geckodriver",
+                    "--browsertime-chromedriver",
+                    "$MOZ_FETCHES_DIR/" + cd_extracted_name["default"],
+                    "--browsertime-ffmpeg",
+                    "$MOZ_FETCHES_DIR/ffmpeg-4.4.1-i686-static/ffmpeg",
+                ],
+            }
+        }
+
+        extra_options.extend(evaluate_keyed_by(eos, "mozharness.extra-options", task))
+
+        yield task
+
+
+def get_mobile_project(task):
+    """Returns the mobile project of the specified task or None."""
+
+    if not task["build-platform"].startswith("android"):
+        return
+
+    mobile_projects = ("fenix", "geckoview", "refbrow", "chrome-m")
+
+    for name in mobile_projects:
+        if name in task["test-name"]:
+            return name
+
+    target = None
+    if "target" in task:
+        resolve_keyed_by(
+            task, "target", item_name=task["test-name"], enforce_single_match=False
+        )
+        target = task["target"]
+    if target:
+        if isinstance(target, dict):
+            target = target["name"]
+
+        for name in mobile_projects:
+            if name in target:
+                return name
+
+    return None
+
+
+@transforms.add
+def disable_wpt_timeouts_on_autoland(config, tasks):
+    """do not run web-platform-tests that are expected TIMEOUT on autoland"""
+    for task in tasks:
+        if (
+            "web-platform-tests" in task["test-name"]
+            and config.params["project"] == "autoland"
+        ):
+            task["mozharness"].setdefault("extra-options", []).append("--skip-timeout")
+        yield task
+
+
+@transforms.add
+def enable_code_coverage(config, tasks):
+    """Enable code coverage for the ccov build-platforms"""
+    for task in tasks:
+        if "ccov" in task["build-platform"]:
+            # Do not run tests on fuzzing builds
+            if "fuzzing" in task["build-platform"]:
+                task["run-on-projects"] = []
+                continue
+
+            # Skip this transform for android code coverage builds.
+            if "android" in task["build-platform"]:
+                task.setdefault("fetches", {}).setdefault("toolchain", []).append(
+                    "linux64-grcov"
+                )
+                task["mozharness"].setdefault("extra-options", []).append(
+                    "--java-code-coverage"
+                )
+                yield task
+                continue
+            task["mozharness"].setdefault("extra-options", []).append("--code-coverage")
+            task["instance-size"] = "xlarge"
+
+            # Temporarily disable Mac tests on mozilla-central
+            if "mac" in task["build-platform"]:
+                task["run-on-projects"] = []
+
+            # Ensure we always run on the projects defined by the build, unless the test
+            # is try only or shouldn't run at all.
+            if task["run-on-projects"] not in [[]]:
+                task["run-on-projects"] = "built-projects"
+
+            # Ensure we don't optimize test suites out.
+            # We always want to run all test suites for coverage purposes.
+            task.pop("schedules-component", None)
+            task.pop("when", None)
+            task["optimization"] = None
+
+            # Add a toolchain and a fetch task for the grcov binary.
+            if any(p in task["build-platform"] for p in ("linux", "osx", "win")):
+                task.setdefault("fetches", {})
+                task["fetches"].setdefault("fetch", [])
+                task["fetches"].setdefault("toolchain", [])
+                task["fetches"].setdefault("build", [])
+
+            if "linux" in task["build-platform"]:
+                task["fetches"]["toolchain"].append("linux64-grcov")
+            elif "osx" in task["build-platform"]:
+                task["fetches"]["toolchain"].append("macosx64-grcov")
+            elif "win" in task["build-platform"]:
+                task["fetches"]["toolchain"].append("win64-grcov")
+
+            task["fetches"]["build"].append({"artifact": "target.mozinfo.json"})
+
+            if "talos" in task["test-name"]:
+                task["max-run-time"] = 7200
+                if "linux" in task["build-platform"]:
+                    task["docker-image"] = {"in-tree": "ubuntu1804-test"}
+                task["mozharness"]["extra-options"].append("--add-option")
+                task["mozharness"]["extra-options"].append("--cycles,1")
+                task["mozharness"]["extra-options"].append("--add-option")
+                task["mozharness"]["extra-options"].append("--tppagecycles,1")
+                task["mozharness"]["extra-options"].append("--add-option")
+                task["mozharness"]["extra-options"].append("--no-upload-results")
+                task["mozharness"]["extra-options"].append("--add-option")
+                task["mozharness"]["extra-options"].append("--tptimeout,15000")
+            if "raptor" in task["test-name"]:
+                task["max-run-time"] = 1800
+        yield task
+
+
+@transforms.add
+def handle_run_on_projects(config, tasks):
+    """Handle translating `built-projects` appropriately"""
+    for task in tasks:
+        if task["run-on-projects"] == "built-projects":
+            task["run-on-projects"] = task["build-attributes"].get(
+                "run_on_projects", ["all"]
+            )
+
+        if task.pop("built-projects-only", False):
+            built_projects = set(
+                task["build-attributes"].get("run_on_projects", {"all"})
+            )
+            run_on_projects = set(task.get("run-on-projects", set()))
+
+            # If 'all' exists in run-on-projects, then the intersection of both
+            # is built-projects. Similarly if 'all' exists in built-projects,
+            # the intersection is run-on-projects (so do nothing). When neither
+            # contains 'all', take the actual set intersection.
+            if "all" in run_on_projects:
+                task["run-on-projects"] = sorted(built_projects)
+            elif "all" not in built_projects:
+                task["run-on-projects"] = sorted(run_on_projects & built_projects)
+        yield task
+
+
+@transforms.add
+def handle_tier(config, tasks):
+    """Set the tier based on policy for all test descriptions that do not
+    specify a tier otherwise."""
+    for task in tasks:
+        if "tier" in task:
+            resolve_keyed_by(
+                task,
+                "tier",
+                item_name=task["test-name"],
+                variant=task["attributes"].get("unittest_variant"),
+                enforce_single_match=False,
+            )
+
+        # only override if not set for the test
+        if "tier" not in task or task["tier"] == "default":
+            if task["test-platform"] in [
+                "linux64/opt",
+                "linux64/debug",
+                "linux64-shippable/opt",
+                "linux64-devedition/opt",
+                "linux64-asan/opt",
+                "linux64-qr/opt",
+                "linux64-qr/debug",
+                "linux64-shippable-qr/opt",
+                "linux1804-64/opt",
+                "linux1804-64/debug",
+                "linux1804-64-shippable/opt",
+                "linux1804-64-devedition/opt",
+                "linux1804-64-qr/opt",
+                "linux1804-64-qr/debug",
+                "linux1804-64-shippable-qr/opt",
+                "linux1804-64-asan-qr/opt",
+                "linux1804-64-tsan-qr/opt",
+                "windows7-32-qr/debug",
+                "windows7-32-qr/opt",
+                "windows7-32-devedition-qr/opt",
+                "windows7-32-shippable-qr/opt",
+                "windows10-32-qr/debug",
+                "windows10-32-qr/opt",
+                "windows10-32-shippable-qr/opt",
+                "windows10-32-2004-qr/debug",
+                "windows10-32-2004-qr/opt",
+                "windows10-32-2004-shippable-qr/opt",
+                "windows10-aarch64-qr/opt",
+                "windows10-64/debug",
+                "windows10-64/opt",
+                "windows10-64-shippable/opt",
+                "windows10-64-devedition/opt",
+                "windows10-64-qr/opt",
+                "windows10-64-qr/debug",
+                "windows10-64-shippable-qr/opt",
+                "windows10-64-devedition-qr/opt",
+                "windows10-64-asan-qr/opt",
+                "windows10-64-2004-qr/opt",
+                "windows10-64-2004-qr/debug",
+                "windows10-64-2004-shippable-qr/opt",
+                "windows10-64-2004-devedition-qr/opt",
+                "windows10-64-2004-asan-qr/opt",
+                "windows11-32-2009-qr/debug",
+                "windows11-32-2009-qr/opt",
+                "windows11-32-2009-shippable-qr/opt",
+                "windows11-64-2009-qr/opt",
+                "windows11-64-2009-qr/debug",
+                "windows11-64-2009-shippable-qr/opt",
+                "windows11-64-2009-devedition-qr/opt",
+                "windows11-64-2009-asan-qr/opt",
+                "macosx1015-64/opt",
+                "macosx1015-64/debug",
+                "macosx1015-64-shippable/opt",
+                "macosx1015-64-devedition/opt",
+                "macosx1015-64-devedition-qr/opt",
+                "macosx1015-64-qr/opt",
+                "macosx1015-64-shippable-qr/opt",
+                "macosx1015-64-qr/debug",
+                "macosx1100-64-shippable-qr/opt",
+                "macosx1100-64-qr/debug",
+                "android-em-7.0-x86_64-shippable/opt",
+                "android-em-7.0-x86_64-shippable-lite/opt",
+                "android-em-7.0-x86_64/debug",
+                "android-em-7.0-x86_64/debug-isolated-process",
+                "android-em-7.0-x86_64/opt",
+                "android-em-7.0-x86_64-lite/opt",
+                "android-em-7.0-x86-shippable/opt",
+                "android-em-7.0-x86-shippable-lite/opt",
+                "android-em-7.0-x86_64-shippable-qr/opt",
+                "android-em-7.0-x86_64-qr/debug",
+                "android-em-7.0-x86_64-qr/debug-isolated-process",
+                "android-em-7.0-x86_64-qr/opt",
+                "android-em-7.0-x86_64-shippable-lite-qr/opt",
+                "android-em-7.0-x86_64-lite-qr/debug",
+                "android-em-7.0-x86_64-lite-qr/opt",
+            ]:
+                task["tier"] = 1
+            else:
+                task["tier"] = 2
+
+        yield task
+
+
+@transforms.add
+def apply_raptor_tier_optimization(config, tasks):
+    for task in tasks:
+        if task["suite"] != "raptor":
+            yield task
+            continue
+
+        if "regression-tests" in task["test-name"]:
+            # Don't optimize the regression tests
+            yield task
+            continue
+
+        if not task["test-platform"].startswith("android-hw"):
+            task["optimization"] = {"skip-unless-expanded": None}
+            if task["tier"] > 1:
+                task["optimization"] = {"skip-unless-backstop": None}
+
+        if task["attributes"].get("unittest_variant"):
+            task["tier"] = max(task["tier"], 2)
+        yield task
+
+
+@transforms.add
+def disable_try_only_platforms(config, tasks):
+    """Turns off platforms that should only run on try."""
+    try_only_platforms = ()
+    for task in tasks:
+        if any(re.match(k + "$", task["test-platform"]) for k in try_only_platforms):
+            task["run-on-projects"] = []
+        yield task
+
+
+@transforms.add
+def ensure_spi_disabled_on_all_but_spi(config, tasks):
+    for task in tasks:
+        variant = task["attributes"].get("unittest_variant", "")
+        has_no_setpref = ("gtest", "cppunit", "jittest", "junit", "raptor")
+
+        if (
+            all(s not in task["suite"] for s in has_no_setpref)
+            and "socketprocess" not in variant
+        ):
+            task["mozharness"]["extra-options"].append(
+                "--setpref=media.peerconnection.mtransport_process=false"
+            )
+            task["mozharness"]["extra-options"].append(
+                "--setpref=network.process.enabled=false"
+            )
+
+        yield task
+
+
+test_setting_description_schema = Schema(
+    {
+        Required("_hash"): str,
+        "platform": {
+            Required("arch"): Any("32", "64", "aarch64", "arm7", "x86_64"),
+            Required("os"): {
+                Required("name"): Any("android", "linux", "macosx", "windows"),
+                Required("version"): str,
+                Optional("build"): str,
+            },
+            Optional("device"): str,
+            Optional("display"): "wayland",
+            Optional("machine"): Any("ref-hw-2017"),
+        },
+        "build": {
+            Required("type"): Any("opt", "debug", "debug-isolated-process"),
+            Any(
+                "asan",
+                "ccov",
+                "clang-trunk",
+                "devedition",
+                "domstreams",
+                "lite",
+                "mingwclang",
+                "nightlyasrelease",
+                "shippable",
+                "tsan",
+            ): bool,
+        },
+        "runtime": {Any(*list(TEST_VARIANTS.keys()) + ["1proc"]): bool},
+    },
+    check=False,
+)
+"""Schema test settings must conform to. Validated by
+:py:func:`~test.test_mozilla_central.test_test_setting`"""
+
+
+@transforms.add
+def set_test_setting(config, tasks):
+    """A test ``setting`` is the set of configuration that uniquely
+    distinguishes a test task from other tasks that run the same suite
+    (ignoring chunks).
+
+    There are three different types of information that make up a setting:
+
+    1. Platform - Information describing the underlying platform tests run on,
+    e.g, OS, CPU architecture, etc.
+
+    2. Build - Information describing the build being tested, e.g build type,
+    ccov, asan/tsan, etc.
+
+    3. Runtime - Information describing which runtime parameters are enabled,
+    e.g, prefs, environment variables, etc.
+
+    This transform adds a ``test-setting`` object to the ``extra`` portion of
+    all test tasks, of the form:
+
+    .. code-block::
+
+        {
+            "platform": { ... },
+            "build": { ... },
+            "runtime": { ... }
+        }
+
+    This information could be derived from the label, but consuming this
+    object is less brittle.
+    """
+    # Some attributes have a dash in them which complicates parsing. Ensure we
+    # don't split them up.
+    # TODO Rename these so they don't have a dash.
+    dash_attrs = [
+        "clang-trunk",
+        "ref-hw-2017",
+    ]
+    dash_token = "%D%"
+    platform_re = re.compile(r"(\D+)(\d*)")
+
+    for task in tasks:
+        setting = {
+            "platform": {
+                "os": {},
+            },
+            "build": {},
+            "runtime": {},
+        }
+
+        # parse platform and build information out of 'test-platform'
+        platform, build_type = task["test-platform"].split("/", 1)
+
+        # ensure dashed attributes don't get split up
+        for attr in dash_attrs:
+            if attr in platform:
+                platform = platform.replace(attr, attr.replace("-", dash_token))
+
+        parts = platform.split("-")
+
+        # restore dashes now that split is finished
+        for i, part in enumerate(parts):
+            if dash_token in part:
+                parts[i] = part.replace(dash_token, "-")
+
+        match = platform_re.match(parts.pop(0))
+        assert match
+        os_name, os_version = match.groups()
+
+        device = machine = os_build = display = None
+        if os_name == "android":
+            device = parts.pop(0)
+            if device == "hw":
+                device = parts.pop(0)
+            else:
+                device = "emulator"
+
+            os_version = parts.pop(0)
+            if parts[0].isdigit():
+                os_version = f"{os_version}.{parts.pop(0)}"
+
+            if parts[0] == "android":
+                parts.pop(0)
+
+            arch = parts.pop(0)
+
+        else:
+            arch = parts.pop(0)
+            if parts[0].isdigit():
+                os_build = parts.pop(0)
+
+            if parts[0] == "ref-hw-2017":
+                machine = parts.pop(0)
+
+            if parts[0] == "wayland":
+                display = parts.pop(0)
+
+        # It's not always possible to glean the exact architecture used from
+        # the task, so sometimes this will just be set to "32" or "64".
+        setting["platform"]["arch"] = arch
+        setting["platform"]["os"] = {
+            "name": os_name,
+            "version": os_version,
+        }
+
+        if os_build:
+            setting["platform"]["os"]["build"] = os_build
+
+        if device:
+            setting["platform"]["device"] = device
+
+        if machine:
+            setting["platform"]["machine"] = machine
+
+        if display:
+            setting["platform"]["display"] = display
+
+        # parse remaining parts as build attributes
+        setting["build"]["type"] = build_type
+        while parts:
+            attr = parts.pop(0)
+            if attr == "qr":
+                # all tasks are webrender now, no need to store it
+                continue
+
+            setting["build"][attr] = True
+
+        unittest_variant = task["attributes"].get("unittest_variant")
+        if unittest_variant:
+            for variant in unittest_variant.split("+"):
+                setting["runtime"][variant] = True
+
+        # add a hash of the setting object for easy comparisons
+        setting["_hash"] = hashlib.sha256(
+            json.dumps(setting, sort_keys=True).encode("utf-8")
+        ).hexdigest()[:12]
+
+        task["test-setting"] = ReadOnlyDict(**setting)
+        yield task
+
+
+@transforms.add
+def allow_software_gl_layers(config, tasks):
+    """
+    Handle the "allow-software-gl-layers" property for platforms where it
+    applies.
+    """
+    for task in tasks:
+        if task.get("allow-software-gl-layers"):
+            # This should be set always once bug 1296086 is resolved.
+            task["mozharness"].setdefault("extra-options", []).append(
+                "--allow-software-gl-layers"
+            )
+
+        yield task
+
+
+@transforms.add
+def enable_webrender(config, tasks):
+    """
+    Handle the "webrender" property by passing a flag to mozharness if it is
+    enabled.
+    """
+    for task in tasks:
+        # TODO: this was all conditionally in enable_webrender- do we still need this?
+        extra_options = task["mozharness"].setdefault("extra-options", [])
+        # We only want to 'setpref' on tests that have a profile
+        if not task["attributes"]["unittest_category"] in [
+            "cppunittest",
+            "geckoview-junit",
+            "gtest",
+            "jittest",
+            "raptor",
+        ]:
+            extra_options.append("--setpref=layers.d3d11.enable-blacklist=false")
+
+        yield task
+
+
+@transforms.add
+def set_schedules_for_webrender_android(config, tasks):
+    """android-hw has limited resources, we need webrender on phones"""
+    for task in tasks:
+        if task["suite"] in ["crashtest", "reftest"] and task[
+            "test-platform"
+        ].startswith("android-hw"):
+            task["schedules-component"] = "android-hw-gfx"
+        yield task
+
+
+@transforms.add
+def set_retry_exit_status(config, tasks):
+    """Set the retry exit status to TBPL_RETRY, the value returned by mozharness
+    scripts to indicate a transient failure that should be retried."""
+    for task in tasks:
+        # add in 137 as it is an error with GCP workers
+        task["retry-exit-status"] = [4, 137]
+        yield task
+
+
+@transforms.add
+def set_profile(config, tasks):
+    """Set profiling mode for tests."""
+    ttconfig = config.params["try_task_config"]
+    profile = ttconfig.get("gecko-profile", False)
+    settings = (
+        "gecko-profile-interval",
+        "gecko-profile-entries",
+        "gecko-profile-threads",
+        "gecko-profile-features",
+    )
+
+    for task in tasks:
+        if profile and task["suite"] in ["talos", "raptor"]:
+            extras = task["mozharness"]["extra-options"]
+            extras.append("--gecko-profile")
+            for setting in settings:
+                value = ttconfig.get(setting)
+                if value is not None:
+                    # These values can contain spaces (eg the "DOM Worker"
+                    # thread) and the command is constructed in different,
+                    # incompatible ways on different platforms.
+
+                    if task["test-platform"].startswith("win"):
+                        # Double quotes for Windows (single won't work).
+                        extras.append("--" + setting + '="' + str(value) + '"')
+                    else:
+                        # Other platforms keep things as separate values,
+                        # rather than joining with spaces.
+                        extras.append("--" + setting + "=" + str(value))
+
+        yield task
+
+
+@transforms.add
+def set_tag(config, tasks):
+    """Set test for a specific tag."""
+    tag = None
+    if config.params["try_mode"] == "try_option_syntax":
+        tag = config.params["try_options"]["tag"]
+    for task in tasks:
+        if tag:
+            task["mozharness"]["extra-options"].extend(["--tag", tag])
+        yield task
+
+
+@transforms.add
+def set_test_type(config, tasks):
+    types = ["mochitest", "reftest", "talos", "raptor", "geckoview-junit", "gtest"]
+    for task in tasks:
+        for test_type in types:
+            if test_type in task["suite"] and "web-platform" not in task["suite"]:
+                task.setdefault("tags", {})["test-type"] = test_type
+        yield task
+
+
+@transforms.add
+def set_schedules_components(config, tasks):
+    for task in tasks:
+        if "optimization" in task or "when" in task:
+            yield task
+            continue
+
+        category = task["attributes"]["unittest_category"]
+        schedules = task.get("schedules-component", category)
+        if isinstance(schedules, str):
+            schedules = [schedules]
+
+        schedules = set(schedules)
+        if schedules & set(INCLUSIVE_COMPONENTS):
+            # if this is an "inclusive" test, then all files which might
+            # cause it to run are annotated with SCHEDULES in moz.build,
+            # so do not include the platform or any other components here
+            task["schedules-component"] = sorted(schedules)
+            yield task
+            continue
+
+        schedules.add(category)
+        schedules.add(platform_family(task["build-platform"]))
+
+        task["schedules-component"] = sorted(schedules)
+        yield task
+
+
+@transforms.add
+def enable_parallel_marking_in_tsan_tests(config, tasks):
+    """Enable parallel marking in TSAN tests"""
+    skip_list = ["cppunittest", "gtest"]
+    for task in tasks:
+        if "-tsan-" in task["test-platform"]:
+            if task["suite"] not in skip_list:
+                extra_options = task["mozharness"].setdefault("extra-options", [])
+                extra_options.append(
+                    "--setpref=javascript.options.mem.gc_parallel_marking=true"
+                )
+
+        yield task
+
+
+@transforms.add
+def apply_windows7_optimization(config, tasks):
+    for task in tasks:
+        if task["test-platform"].startswith("windows7"):
+            task["optimization"] = {"skip-unless-backstop": None}
+
+        yield task
diff --git a/taskcluster/gecko_taskgraph/transforms/test/raptor.py b/taskcluster/gecko_taskgraph/transforms/test/raptor.py
new file mode 100644
index 0000000000..3eac5dd9ef
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/test/raptor.py
@@ -0,0 +1,317 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+
+from taskgraph.transforms.base import TransformSequence
+from taskgraph.util.schema import Schema, optionally_keyed_by, resolve_keyed_by
+from taskgraph.util.treeherder import join_symbol, split_symbol
+from voluptuous import Extra, Optional, Required
+
+from gecko_taskgraph.transforms.test import test_description_schema
+from gecko_taskgraph.util.copy_task import copy_task
+
+transforms = TransformSequence()
+task_transforms = TransformSequence()
+
+raptor_description_schema = Schema(
+    {
+        # Raptor specific configs.
+        Optional("raptor"): {
+            Optional("activity"): optionally_keyed_by("app", str),
+            Optional("apps"): optionally_keyed_by("test-platform", "subtest", [str]),
+            Optional("binary-path"): optionally_keyed_by("app", str),
+            Optional("run-visual-metrics"): optionally_keyed_by("app", bool),
+            Optional("subtests"): optionally_keyed_by("app", "test-platform", list),
+            Optional("test"): str,
+            Optional("test-url-param"): optionally_keyed_by(
+                "subtest", "test-platform", str
+            ),
+        },
+        # Configs defined in the 'test_description_schema'.
+        Optional("max-run-time"): optionally_keyed_by(
+            "app", "subtest", "test-platform", test_description_schema["max-run-time"]
+        ),
+        Optional("run-on-projects"): optionally_keyed_by(
+            "app",
+            "test-name",
+            "raptor.test",
+            "subtest",
+            "variant",
+            test_description_schema["run-on-projects"],
+        ),
+        Optional("variants"): test_description_schema["variants"],
+        Optional("target"): optionally_keyed_by(
+            "app", test_description_schema["target"]
+        ),
+        Optional("tier"): optionally_keyed_by(
+            "app", "raptor.test", "subtest", "variant", test_description_schema["tier"]
+        ),
+        Required("test-name"): test_description_schema["test-name"],
+        Required("test-platform"): test_description_schema["test-platform"],
+        Required("require-signed-extensions"): test_description_schema[
+            "require-signed-extensions"
+        ],
+        Required("treeherder-symbol"): test_description_schema["treeherder-symbol"],
+        # Any unrecognized keys will be validated against the test_description_schema.
+        Extra: object,
+    }
+)
+
+transforms.add_validate(raptor_description_schema)
+
+
+@transforms.add
+def set_defaults(config, tests):
+    for test in tests:
+        test.setdefault("raptor", {}).setdefault("run-visual-metrics", False)
+        yield test
+
+
+@transforms.add
+def split_apps(config, tests):
+    app_symbols = {
+        "chrome": "ChR",
+        "chrome-m": "ChR",
+        "chromium": "Cr",
+        "fenix": "fenix",
+        "refbrow": "refbrow",
+        "safari": "Saf",
+        "custom-car": "CaR",
+    }
+
+    for test in tests:
+        apps = test["raptor"].pop("apps", None)
+        if not apps:
+            yield test
+            continue
+
+        for app in apps:
+            # Ignore variants for non-Firefox or non-mobile applications.
+            if app not in ["firefox", "geckoview", "fenix", "chrome-m"] and test[
+                "attributes"
+            ].get("unittest_variant"):
+                continue
+
+            atest = copy_task(test)
+            suffix = f"-{app}"
+            atest["app"] = app
+            atest["description"] += f" on {app.capitalize()}"
+
+            name = atest["test-name"] + suffix
+            atest["test-name"] = name
+            atest["try-name"] = name
+
+            if app in app_symbols:
+                group, symbol = split_symbol(atest["treeherder-symbol"])
+                group += f"-{app_symbols[app]}"
+                atest["treeherder-symbol"] = join_symbol(group, symbol)
+
+            yield atest
+
+
+@transforms.add
+def handle_keyed_by_prereqs(config, tests):
+    """
+    Only resolve keys for prerequisite fields here since the
+    these keyed-by options might have keyed-by fields
+    as well.
+    """
+    for test in tests:
+        resolve_keyed_by(test, "raptor.subtests", item_name=test["test-name"])
+        yield test
+
+
+@transforms.add
+def split_raptor_subtests(config, tests):
+    for test in tests:
+        # For tests that have 'subtests' listed, we want to create a separate
+        # test job for every subtest (i.e. split out each page-load URL into its own job)
+        subtests = test["raptor"].pop("subtests", None)
+        if not subtests:
+            yield test
+            continue
+
+        for chunk_number, subtest in enumerate(subtests):
+
+            # Create new test job
+            chunked = copy_task(test)
+            chunked["chunk-number"] = 1 + chunk_number
+            chunked["subtest"] = subtest
+            chunked["subtest-symbol"] = subtest
+            if isinstance(chunked["subtest"], list):
+                chunked["subtest"] = subtest[0]
+                chunked["subtest-symbol"] = subtest[1]
+            chunked = resolve_keyed_by(
+                chunked, "tier", chunked["subtest"], defer=["variant"]
+            )
+            yield chunked
+
+
+@transforms.add
+def handle_keyed_by(config, tests):
+    fields = [
+        "raptor.test-url-param",
+        "raptor.run-visual-metrics",
+        "raptor.activity",
+        "raptor.binary-path",
+        "limit-platforms",
+        "fetches.fetch",
+        "max-run-time",
+        "run-on-projects",
+        "target",
+        "tier",
+    ]
+    for test in tests:
+        for field in fields:
+            resolve_keyed_by(
+                test, field, item_name=test["test-name"], defer=["variant"]
+            )
+        yield test
+
+
+@transforms.add
+def split_page_load_by_url(config, tests):
+    for test in tests:
+        # `chunk-number` and 'subtest' only exists when the task had a
+        # definition for `subtests`
+        chunk_number = test.pop("chunk-number", None)
+        subtest = test.get(
+            "subtest"
+        )  # don't pop as some tasks need this value after splitting variants
+        subtest_symbol = test.pop("subtest-symbol", None)
+
+        if not chunk_number or not subtest:
+            yield test
+            continue
+
+        if len(subtest_symbol) > 10 and "ytp" not in subtest_symbol:
+            raise Exception(
+                "Treeherder symbol %s is larger than 10 char! Please use a different symbol."
+                % subtest_symbol
+            )
+
+        if test["test-name"].startswith("browsertime-"):
+            test["raptor"]["test"] = subtest
+
+            # Remove youtube-playback in the test name to avoid duplication
+            test["test-name"] = test["test-name"].replace("youtube-playback-", "")
+        else:
+            # Use full test name if running on webextension
+            test["raptor"]["test"] = "raptor-tp6-" + subtest + "-{}".format(test["app"])
+
+        # Only run the subtest/single URL
+        test["test-name"] += f"-{subtest}"
+        test["try-name"] += f"-{subtest}"
+
+        # Set treeherder symbol and description
+        group, _ = split_symbol(test["treeherder-symbol"])
+        test["treeherder-symbol"] = join_symbol(group, subtest_symbol)
+        test["description"] += f" on {subtest}"
+
+        yield test
+
+
+@transforms.add
+def modify_extra_options(config, tests):
+    for test in tests:
+        test_name = test.get("test-name", None)
+
+        if "first-install" in test_name:
+            # First-install tests should never use conditioned profiles
+            extra_options = test.setdefault("mozharness", {}).setdefault(
+                "extra-options", []
+            )
+
+            for i, opt in enumerate(extra_options):
+                if "conditioned-profile" in opt:
+                    if i:
+                        extra_options.pop(i)
+                    break
+
+        if "-widevine" in test_name:
+            extra_options = test.setdefault("mozharness", {}).setdefault(
+                "extra-options", []
+            )
+            for i, opt in enumerate(extra_options):
+                if "--conditioned-profile=settled" in opt:
+                    if i:
+                        extra_options[i] += "-youtube"
+                    break
+
+        if "unity-webgl" in test_name:
+            # Disable the extra-profiler-run for unity-webgl tests.
+            extra_options = test.setdefault("mozharness", {}).setdefault(
+                "extra-options", []
+            )
+            for i, opt in enumerate(extra_options):
+                if "extra-profiler-run" in opt:
+                    if i:
+                        extra_options.pop(i)
+                    break
+
+        yield test
+
+
+@transforms.add
+def add_extra_options(config, tests):
+    for test in tests:
+        mozharness = test.setdefault("mozharness", {})
+        if test.get("app", "") == "chrome-m":
+            mozharness["tooltool-downloads"] = "internal"
+
+        extra_options = mozharness.setdefault("extra-options", [])
+
+        # Adding device name if we're on android
+        test_platform = test["test-platform"]
+        if test_platform.startswith("android-hw-g5"):
+            extra_options.append("--device-name=g5")
+        elif test_platform.startswith("android-hw-a51"):
+            extra_options.append("--device-name=a51")
+        elif test_platform.startswith("android-hw-p5"):
+            extra_options.append("--device-name=p5_aarch64")
+
+        if test["raptor"].pop("run-visual-metrics", False):
+            extra_options.append("--browsertime-video")
+            extra_options.append("--browsertime-visualmetrics")
+            test["attributes"]["run-visual-metrics"] = True
+
+        if "app" in test:
+            extra_options.append(
+                "--app={}".format(test["app"])
+            )  # don't pop as some tasks need this value after splitting variants
+
+        if "activity" in test["raptor"]:
+            extra_options.append("--activity={}".format(test["raptor"].pop("activity")))
+
+        if "binary-path" in test["raptor"]:
+            extra_options.append(
+                "--binary-path={}".format(test["raptor"].pop("binary-path"))
+            )
+
+        if "test" in test["raptor"]:
+            extra_options.append("--test={}".format(test["raptor"].pop("test")))
+
+        if test["require-signed-extensions"]:
+            extra_options.append("--is-release-build")
+
+        if "test-url-param" in test["raptor"]:
+            param = test["raptor"].pop("test-url-param")
+            if not param == []:
+                extra_options.append(
+                    "--test-url-params={}".format(param.replace(" ", ""))
+                )
+
+        extra_options.append("--project={}".format(config.params.get("project")))
+
+        yield test
+
+
+@task_transforms.add
+def add_scopes_and_proxy(config, tasks):
+    for task in tasks:
+        task.setdefault("worker", {})["taskcluster-proxy"] = True
+        task.setdefault("scopes", []).append(
+            "secrets:get:project/perftest/gecko/level-{level}/perftest-login"
+        )
+        yield task
diff --git a/taskcluster/gecko_taskgraph/transforms/test/variant.py b/taskcluster/gecko_taskgraph/transforms/test/variant.py
new file mode 100644
index 0000000000..e2fd9764e1
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/test/variant.py
@@ -0,0 +1,128 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+import datetime
+
+import jsone
+from taskgraph.transforms.base import TransformSequence
+from taskgraph.util.schema import Schema, validate_schema
+from taskgraph.util.treeherder import join_symbol, split_symbol
+from taskgraph.util.yaml import load_yaml
+from voluptuous import Any, Optional, Required
+
+import gecko_taskgraph
+from gecko_taskgraph.util.copy_task import copy_task
+from gecko_taskgraph.util.templates import merge
+
+transforms = TransformSequence()
+
+TEST_VARIANTS = load_yaml(
+    gecko_taskgraph.GECKO, "taskcluster", "ci", "test", "variants.yml"
+)
+"""List of available test variants defined."""
+
+
+variant_description_schema = Schema(
+    {
+        str: {
+            Required("description"): str,
+            Required("suffix"): str,
+            Required("component"): str,
+            Required("expiration"): str,
+            Optional("when"): {Any("$eval", "$if"): str},
+            Optional("replace"): {str: object},
+            Optional("merge"): {str: object},
+        }
+    }
+)
+"""variant description schema"""
+
+
+@transforms.add
+def split_variants(config, tasks):
+    """Splits test definitions into multiple tasks based on the `variants` key.
+
+    If `variants` are defined, the original task will be yielded along with a
+    copy of the original task for each variant defined in the list. The copies
+    will have the 'unittest_variant' attribute set.
+    """
+    validate_schema(variant_description_schema, TEST_VARIANTS, "In variants.yml:")
+
+    def find_expired_variants(variants):
+        expired = []
+
+        # do not expire on esr/beta/release
+        if config.params.get("release_type", "") in [
+            "release",
+            "beta",
+        ]:
+            return []
+
+        if "esr" in config.params.get("release_type", ""):
+            return []
+
+        today = datetime.datetime.today()
+        for variant in variants:
+
+            expiration = variants[variant]["expiration"]
+            if len(expiration.split("-")) == 1:
+                continue
+            expires_at = datetime.datetime.strptime(expiration, "%Y-%m-%d")
+            if expires_at < today:
+                expired.append(variant)
+        return expired
+
+    def remove_expired(variants, expired):
+        remaining_variants = []
+        for name in variants:
+            parts = [p for p in name.split("+") if p not in expired]
+            if len(parts) == 0:
+                continue
+
+            remaining_variants.append(name)
+        return remaining_variants
+
+    def apply_variant(variant, task):
+        task["description"] = variant["description"].format(**task)
+
+        suffix = f"-{variant['suffix']}"
+        group, symbol = split_symbol(task["treeherder-symbol"])
+        if group != "?":
+            group += suffix
+        else:
+            symbol += suffix
+        task["treeherder-symbol"] = join_symbol(group, symbol)
+
+        # This will be used to set the label and try-name in 'make_job_description'.
+        task.setdefault("variant-suffix", "")
+        task["variant-suffix"] += suffix
+
+        # Replace and/or merge the configuration.
+        task.update(variant.get("replace", {}))
+        return merge(task, variant.get("merge", {}))
+
+    expired_variants = find_expired_variants(TEST_VARIANTS)
+    for task in tasks:
+        variants = task.pop("variants", [])
+        variants = remove_expired(variants, expired_variants)
+
+        if task.pop("run-without-variant"):
+            yield copy_task(task)
+
+        for name in variants:
+            # Apply composite variants (joined by '+') in order.
+            parts = name.split("+")
+            taskv = copy_task(task)
+            for part in parts:
+                variant = TEST_VARIANTS[part]
+
+                # If any variant in a composite fails this check we skip it.
+                if "when" in variant:
+                    context = {"task": task}
+                    if not jsone.render(variant["when"], context):
+                        break
+
+                taskv = apply_variant(variant, taskv)
+            else:
+                taskv["attributes"]["unittest_variant"] = name
+                yield taskv
diff --git a/taskcluster/gecko_taskgraph/transforms/test/worker.py b/taskcluster/gecko_taskgraph/transforms/test/worker.py
new file mode 100644
index 0000000000..0d8d72162d
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/test/worker.py
@@ -0,0 +1,201 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+from taskgraph.transforms.base import TransformSequence
+
+# default worker types keyed by instance-size
+LINUX_WORKER_TYPES = {
+    "large": "t-linux-large",
+    "xlarge": "t-linux-xlarge",
+    "default": "t-linux-large",
+}
+
+# windows worker types keyed by test-platform and virtualization
+WINDOWS_WORKER_TYPES = {
+    "windows7-32-qr": {
+        "virtual": "t-win7-32",
+        "virtual-with-gpu": "t-win7-32-gpu",
+        "hardware": "t-win10-64-1803-hw",
+    },
+    "windows7-32-shippable-qr": {
+        "virtual": "t-win7-32",
+        "virtual-with-gpu": "t-win7-32-gpu",
+        "hardware": "t-win10-64-1803-hw",
+    },
+    "windows7-32-devedition-qr": {  # build only, tests have no value
+        "virtual": "t-win7-32",
+        "virtual-with-gpu": "t-win7-32-gpu",
+        "hardware": "t-win10-64-1803-hw",
+    },
+    "windows10-64": {  # source-test
+        "virtual": "t-win10-64",
+        "virtual-with-gpu": "t-win10-64-gpu-s",
+        "hardware": "t-win10-64-1803-hw",
+    },
+    "windows10-64-shippable-qr": {
+        "virtual": "t-win10-64",
+        "virtual-with-gpu": "t-win10-64-gpu-s",
+        "hardware": "t-win10-64-1803-hw",
+    },
+    "windows10-64-ref-hw-2017": {
+        "virtual": "t-win10-64",
+        "virtual-with-gpu": "t-win10-64-gpu-s",
+        "hardware": "t-win10-64-ref-hw",
+    },
+    "windows10-64-2009-qr": {
+        "virtual": "win10-64-2009",
+        "virtual-with-gpu": "win10-64-2009-gpu",
+    },
+    "windows10-64-2009-shippable-qr": {
+        "virtual": "win10-64-2009",
+        "virtual-with-gpu": "win10-64-2009-gpu",
+    },
+    "windows11-32-2009-mingwclang-qr": {
+        "virtual": "win11-64-2009",
+        "virtual-with-gpu": "win11-64-2009-gpu",
+    },
+    "windows11-32-2009-qr": {
+        "virtual": "win11-64-2009",
+        "virtual-with-gpu": "win11-64-2009-gpu",
+    },
+    "windows11-32-2009-shippable-qr": {
+        "virtual": "win11-64-2009",
+        "virtual-with-gpu": "win11-64-2009-gpu",
+    },
+    "windows11-64-2009": {
+        "virtual": "win11-64-2009",
+        "virtual-with-gpu": "win11-64-2009-gpu",
+    },
+    "windows11-64-2009-ccov": {
+        "virtual": "win11-64-2009-ssd",
+        "virtual-with-gpu": "win11-64-2009-ssd-gpu",
+    },
+    "windows11-64-2009-ccov-qr": {
+        "virtual": "win11-64-2009-ssd",
+        "virtual-with-gpu": "win11-64-2009-ssd-gpu",
+    },
+    "windows11-64-2009-devedition": {
+        "virtual": "win11-64-2009",
+        "virtual-with-gpu": "win11-64-2009-gpu",
+    },
+    "windows11-64-2009-shippable": {
+        "virtual": "win11-64-2009",
+        "virtual-with-gpu": "win11-64-2009-gpu",
+    },
+    "windows11-64-2009-qr": {
+        "virtual": "win11-64-2009",
+        "virtual-with-gpu": "win11-64-2009-gpu",
+    },
+    "windows11-64-2009-shippable-qr": {
+        "virtual": "win11-64-2009",
+        "virtual-with-gpu": "win11-64-2009-gpu",
+    },
+    "windows11-64-2009-devedition-qr": {
+        "virtual": "win11-64-2009",
+        "virtual-with-gpu": "win11-64-2009-gpu",
+    },
+    "windows11-64-2009-asan-qr": {
+        "virtual": "win11-64-2009",
+        "virtual-with-gpu": "win11-64-2009-gpu",
+    },
+    "windows11-64-2009-mingwclang-qr": {
+        "virtual": "win11-64-2009",
+        "virtual-with-gpu": "win11-64-2009-gpu",
+    },
+}
+
+# os x worker types keyed by test-platform
+MACOSX_WORKER_TYPES = {
+    "macosx1015-64-power": "t-osx-1015-power",
+    "macosx1015-64": "t-osx-1015-r8",
+    "macosx1100-64": "t-osx-1100-m1",
+}
+
+transforms = TransformSequence()
+
+
+@transforms.add
+def set_worker_type(config, tasks):
+    """Set the worker type based on the test platform."""
+    for task in tasks:
+        # during the taskcluster migration, this is a bit tortured, but it
+        # will get simpler eventually!
+        test_platform = task["test-platform"]
+        if task.get("worker-type", "default") != "default":
+            # This test already has its worker type defined, so just use that (yields below)
+            # Unless the value is set to "default", in that case ignore it.
+            pass
+        elif test_platform.startswith("macosx1015-64"):
+            if "--power-test" in task["mozharness"]["extra-options"]:
+                task["worker-type"] = MACOSX_WORKER_TYPES["macosx1015-64-power"]
+            else:
+                task["worker-type"] = MACOSX_WORKER_TYPES["macosx1015-64"]
+        elif test_platform.startswith("macosx1100-64"):
+            task["worker-type"] = MACOSX_WORKER_TYPES["macosx1100-64"]
+        elif test_platform.startswith("win"):
+            # figure out what platform the job needs to run on
+            if task["virtualization"] == "hardware":
+                # some jobs like talos and reftest run on real h/w - those are all win10
+                if test_platform.startswith("windows10-64-ref-hw-2017"):
+                    win_worker_type_platform = WINDOWS_WORKER_TYPES[
+                        "windows10-64-ref-hw-2017"
+                    ]
+                else:
+                    win_worker_type_platform = WINDOWS_WORKER_TYPES["windows10-64"]
+            else:
+                # the other jobs run on a vm which may or may not be a win10 vm
+                win_worker_type_platform = WINDOWS_WORKER_TYPES[
+                    test_platform.split("/")[0]
+                ]
+                if task[
+                    "virtualization"
+                ] == "virtual-with-gpu" and test_platform.startswith("windows1"):
+                    # add in `--requires-gpu` to the mozharness options
+                    task["mozharness"]["extra-options"].append("--requires-gpu")
+
+            # now we have the right platform set the worker type accordingly
+            task["worker-type"] = win_worker_type_platform[task["virtualization"]]
+        elif test_platform.startswith("android-hw-g5"):
+            if task["suite"] != "raptor":
+                task["worker-type"] = "t-bitbar-gw-unit-g5"
+            else:
+                task["worker-type"] = "t-bitbar-gw-perf-g5"
+        elif test_platform.startswith("android-hw-p5"):
+            if task["suite"] != "raptor":
+                task["worker-type"] = "t-bitbar-gw-unit-p5"
+            else:
+                task["worker-type"] = "t-bitbar-gw-perf-p5"
+        elif test_platform.startswith("android-hw-a51"):
+            if task["suite"] != "raptor":
+                task["worker-type"] = "t-bitbar-gw-unit-a51"
+            else:
+                task["worker-type"] = "t-bitbar-gw-perf-a51"
+        elif test_platform.startswith("android-em-7.0-x86"):
+            task["worker-type"] = "t-linux-kvm"
+        elif test_platform.startswith("linux") or test_platform.startswith("android"):
+            if "wayland" in test_platform:
+                task["worker-type"] = "t-linux-wayland"
+            elif task.get("suite", "") in ["talos", "raptor"] and not task[
+                "build-platform"
+            ].startswith("linux64-ccov"):
+                task["worker-type"] = "t-linux-talos-1804"
+            else:
+                task["worker-type"] = LINUX_WORKER_TYPES[task["instance-size"]]
+        else:
+            raise Exception(f"unknown test_platform {test_platform}")
+
+        yield task
+
+
+@transforms.add
+def set_wayland_env(config, tasks):
+    for task in tasks:
+        if task["worker-type"] != "t-linux-wayland":
+            yield task
+            continue
+
+        env = task.setdefault("worker", {}).setdefault("env", {})
+        env["MOZ_ENABLE_WAYLAND"] = "1"
+        env["WAYLAND_DISPLAY"] = "wayland-0"
+        yield task
diff --git a/taskcluster/gecko_taskgraph/transforms/try_job.py b/taskcluster/gecko_taskgraph/transforms/try_job.py
new file mode 100644
index 0000000000..4b3281f5c5
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/try_job.py
@@ -0,0 +1,18 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+from taskgraph.transforms.base import TransformSequence
+
+transforms = TransformSequence()
+
+
+@transforms.add
+def set_job_try_name(config, jobs):
+    """
+    For a task which is governed by `-j` in try syntax, set the `job_try_name`
+    attribute based on the job name.
+    """
+    for job in jobs:
+        job.setdefault("attributes", {}).setdefault("job_try_name", job["name"])
+        yield job
diff --git a/taskcluster/gecko_taskgraph/transforms/update_verify.py b/taskcluster/gecko_taskgraph/transforms/update_verify.py
new file mode 100644
index 0000000000..19c932c746
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/update_verify.py
@@ -0,0 +1,58 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+Transform the beetmover task into an actual task description.
+"""
+
+
+from copy import deepcopy
+
+from taskgraph.transforms.base import TransformSequence
+from taskgraph.util.treeherder import add_suffix, inherit_treeherder_from_dep
+
+from gecko_taskgraph.util.attributes import task_name
+
+transforms = TransformSequence()
+
+
+@transforms.add
+def add_command(config, tasks):
+    config_tasks = {}
+    for dep in config.kind_dependencies_tasks.values():
+        if (
+            "update-verify-config" in dep.kind
+            or "update-verify-next-config" in dep.kind
+        ):
+            config_tasks[task_name(dep)] = dep
+
+    for task in tasks:
+        config_task = config_tasks[task["name"]]
+        total_chunks = task["extra"]["chunks"]
+        task["worker"].setdefault("env", {})["CHANNEL"] = config_task.task["extra"][
+            "channel"
+        ]
+        task.setdefault("fetches", {})[config_task.label] = [
+            "update-verify.cfg",
+        ]
+        task["treeherder"] = inherit_treeherder_from_dep(task, config_task)
+
+        for this_chunk in range(1, total_chunks + 1):
+            chunked = deepcopy(task)
+            chunked["treeherder"]["symbol"] = add_suffix(
+                chunked["treeherder"]["symbol"], this_chunk
+            )
+            chunked["label"] = "release-update-verify-{}-{}/{}".format(
+                chunked["name"], this_chunk, total_chunks
+            )
+            if not chunked["worker"].get("env"):
+                chunked["worker"]["env"] = {}
+            chunked["run"] = {
+                "using": "run-task",
+                "cwd": "{checkout}",
+                "command": "tools/update-verify/scripts/chunked-verify.sh "
+                f"--total-chunks={total_chunks} --this-chunk={this_chunk}",
+                "sparse-profile": "update-verify",
+            }
+
+            yield chunked
diff --git a/taskcluster/gecko_taskgraph/transforms/update_verify_config.py b/taskcluster/gecko_taskgraph/transforms/update_verify_config.py
new file mode 100644
index 0000000000..1de808f82b
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/update_verify_config.py
@@ -0,0 +1,148 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+Transform the beetmover task into an actual task description.
+"""
+
+from urllib.parse import urlsplit
+
+from taskgraph.transforms.base import TransformSequence
+from taskgraph.util.schema import resolve_keyed_by
+
+from gecko_taskgraph.transforms.task import get_branch_repo, get_branch_rev
+from gecko_taskgraph.util.attributes import release_level
+from gecko_taskgraph.util.scriptworker import get_release_config
+
+transforms = TransformSequence()
+
+
+# The beta regexes do not match point releases.
+# In the rare event that we do ship a point
+# release to beta, we need to either:
+# 1) update these regexes to match that specific version
+# 2) pass a second include version that matches that specific version
+INCLUDE_VERSION_REGEXES = {
+    "beta": r"'^(\d+\.\d+(b\d+)?)$'",
+    "nonbeta": r"'^\d+\.\d+(\.\d+)?$'",
+    # Same as nonbeta, except for the esr suffix
+    "esr": r"'^\d+\.\d+(\.\d+)?esr$'",
+    # Previous esr versions, for update testing before we update users to esr102
+    "esr115-next": r"'^(52|60|68|78|91|102)+\.\d+(\.\d+)?esr$'",
+}
+
+MAR_CHANNEL_ID_OVERRIDE_REGEXES = {
+    "beta": r"'^\d+\.\d+(\.\d+)?$$,firefox-mozilla-beta,firefox-mozilla-release'",
+}
+
+
+def ensure_wrapped_singlequote(regexes):
+    """Ensure that a regex (from INCLUDE_VERSION_REGEXES or MAR_CHANNEL_ID_OVERRIDE_REGEXES)
+    is wrapper in single quotes.
+    """
+    for name, regex in regexes.items():
+        if regex[0] != "'" or regex[-1] != "'":
+            raise Exception(
+                "Regex {} is invalid: not wrapped with single quotes.\n{}".format(
+                    name, regex
+                )
+            )
+
+
+ensure_wrapped_singlequote(INCLUDE_VERSION_REGEXES)
+ensure_wrapped_singlequote(MAR_CHANNEL_ID_OVERRIDE_REGEXES)
+
+
+@transforms.add
+def add_command(config, tasks):
+    keyed_by_args = [
+        "channel",
+        "archive-prefix",
+        "previous-archive-prefix",
+        "aus-server",
+        "override-certs",
+        "include-version",
+        "mar-channel-id-override",
+        "last-watershed",
+    ]
+    optional_args = [
+        "updater-platform",
+    ]
+
+    release_config = get_release_config(config)
+
+    for task in tasks:
+        task["description"] = "generate update verify config for {}".format(
+            task["attributes"]["build_platform"]
+        )
+
+        command = [
+            "python",
+            "testing/mozharness/scripts/release/update-verify-config-creator.py",
+            "--product",
+            task["extra"]["product"],
+            "--stage-product",
+            task["shipping-product"],
+            "--app-name",
+            task["extra"]["app-name"],
+            "--branch-prefix",
+            task["extra"]["branch-prefix"],
+            "--platform",
+            task["extra"]["platform"],
+            "--to-version",
+            release_config["version"],
+            "--to-app-version",
+            release_config["appVersion"],
+            "--to-build-number",
+            str(release_config["build_number"]),
+            "--to-buildid",
+            config.params["moz_build_date"],
+            "--to-revision",
+            get_branch_rev(config),
+            "--output-file",
+            "update-verify.cfg",
+        ]
+
+        repo_path = urlsplit(get_branch_repo(config)).path.lstrip("/")
+        command.extend(["--repo-path", repo_path])
+
+        if release_config.get("partial_versions"):
+            for partial in release_config["partial_versions"].split(","):
+                command.extend(["--partial-version", partial.split("build")[0]])
+
+        for arg in optional_args:
+            if task["extra"].get(arg):
+                command.append(f"--{arg}")
+                command.append(task["extra"][arg])
+
+        for arg in keyed_by_args:
+            thing = f"extra.{arg}"
+            resolve_keyed_by(
+                task,
+                thing,
+                item_name=task["name"],
+                platform=task["attributes"]["build_platform"],
+                **{
+                    "release-type": config.params["release_type"],
+                    "release-level": release_level(config.params["project"]),
+                },
+            )
+            # ignore things that resolved to null
+            if not task["extra"].get(arg):
+                continue
+            if arg == "include-version":
+                task["extra"][arg] = INCLUDE_VERSION_REGEXES[task["extra"][arg]]
+            if arg == "mar-channel-id-override":
+                task["extra"][arg] = MAR_CHANNEL_ID_OVERRIDE_REGEXES[task["extra"][arg]]
+
+            command.append(f"--{arg}")
+            command.append(task["extra"][arg])
+
+        task["run"].update(
+            {
+                "using": "mach",
+                "mach": " ".join(command),
+            }
+        )
+
+        yield task
diff --git a/taskcluster/gecko_taskgraph/transforms/upload_generated_sources.py b/taskcluster/gecko_taskgraph/transforms/upload_generated_sources.py
new file mode 100644
index 0000000000..b862645eed
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/upload_generated_sources.py
@@ -0,0 +1,40 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+Transform the upload-generated-files task description template,
+taskcluster/ci/upload-generated-sources/kind.yml, into an actual task description.
+"""
+
+from taskgraph.transforms.base import TransformSequence
+
+transforms = TransformSequence()
+
+
+@transforms.add
+def add_task_info(config, jobs):
+    for job in jobs:
+        dep_task = job["primary-dependency"]
+        del job["primary-dependency"]
+
+        # Add a dependency on the build task.
+        job["dependencies"] = {"build": dep_task.label}
+        # Label the job to match the build task it's uploading from.
+        job["label"] = dep_task.label.replace("build-", "upload-generated-sources-")
+        # Copy over some bits of metdata from the build task.
+        dep_th = dep_task.task["extra"]["treeherder"]
+        job.setdefault("attributes", {})
+        job["attributes"]["build_platform"] = dep_task.attributes.get("build_platform")
+        if dep_task.attributes.get("shippable"):
+            job["attributes"]["shippable"] = True
+        plat = "{}/{}".format(
+            dep_th["machine"]["platform"], dep_task.attributes.get("build_type")
+        )
+        job["treeherder"]["platform"] = plat
+        job["treeherder"]["tier"] = dep_th["tier"]
+        if dep_th["symbol"] != "N":
+            job["treeherder"]["symbol"] = "Ugs{}".format(dep_th["symbol"])
+        job["run-on-projects"] = dep_task.attributes.get("run_on_projects")
+        job["optimization"] = dep_task.optimization
+
+        yield job
diff --git a/taskcluster/gecko_taskgraph/transforms/upload_symbols.py b/taskcluster/gecko_taskgraph/transforms/upload_symbols.py
new file mode 100644
index 0000000000..f6d40e9a45
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/upload_symbols.py
@@ -0,0 +1,95 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+Transform the upload-symbols task description template,
+taskcluster/ci/upload-symbols/job-template.yml into an actual task description.
+"""
+
+
+import logging
+
+from taskgraph.transforms.base import TransformSequence
+from taskgraph.util.treeherder import inherit_treeherder_from_dep, join_symbol
+
+from gecko_taskgraph.util.attributes import (
+    RELEASE_PROJECTS,
+    copy_attributes_from_dependent_job,
+)
+
+logger = logging.getLogger(__name__)
+
+transforms = TransformSequence()
+
+
+@transforms.add
+def check_nightlies(config, tasks):
+    """Ensure that we upload symbols for all shippable builds, so that crash-stats can
+    resolve any reports sent to it. Try may enable full symbols but not upload them.
+
+    Putting this check here (instead of the transforms for the build kind) lets us
+    leverage the any not-for-build-platforms set in the update-symbols kind."""
+    for task in tasks:
+        dep = task["primary-dependency"]
+        if (
+            config.params["project"] in RELEASE_PROJECTS
+            and dep.attributes.get("shippable")
+            and not dep.attributes.get("enable-full-crashsymbols")
+            and not dep.attributes.get("skip-upload-crashsymbols")
+        ):
+            raise Exception(
+                "Shippable job %s should have enable-full-crashsymbols attribute "
+                "set to true to enable symbol upload to crash-stats" % dep.label
+            )
+        yield task
+
+
+@transforms.add
+def fill_template(config, tasks):
+    for task in tasks:
+        dep = task["primary-dependency"]
+        task.pop("dependent-tasks", None)
+
+        # Fill out the dynamic fields in the task description
+        task["label"] = dep.label + "-upload-symbols"
+
+        # Skip tasks where we don't have the full crashsymbols enabled
+        if not dep.attributes.get("enable-full-crashsymbols") or dep.attributes.get(
+            "skip-upload-crashsymbols"
+        ):
+            logger.debug("Skipping upload symbols task for %s", task["label"])
+            continue
+
+        task["dependencies"] = {"build": dep.label}
+        task["worker"]["env"]["GECKO_HEAD_REPOSITORY"] = config.params[
+            "head_repository"
+        ]
+        task["worker"]["env"]["GECKO_HEAD_REV"] = config.params["head_rev"]
+        task["worker"]["env"]["SYMBOL_SECRET"] = task["worker"]["env"][
+            "SYMBOL_SECRET"
+        ].format(level=config.params["level"])
+
+        attributes = copy_attributes_from_dependent_job(dep)
+        attributes.update(task.get("attributes", {}))
+        task["attributes"] = attributes
+
+        treeherder = inherit_treeherder_from_dep(task, dep)
+        th = dep.task.get("extra")["treeherder"]
+        th_symbol = th.get("symbol")
+        th_groupsymbol = th.get("groupSymbol", "?")
+
+        # Disambiguate the treeherder symbol.
+        sym = "Sym" + (th_symbol[1:] if th_symbol.startswith("B") else th_symbol)
+        treeherder.setdefault("symbol", join_symbol(th_groupsymbol, sym))
+        task["treeherder"] = treeherder
+
+        # We only want to run these tasks if the build is run.
+        # XXX Better to run this on promote phase instead?
+        task["run-on-projects"] = dep.attributes.get("run_on_projects")
+        task["optimization"] = {"upload-symbols": None}
+        task["if-dependencies"] = ["build"]
+
+        # clear out the stuff that's not part of a task description
+        del task["primary-dependency"]
+
+        yield task
diff --git a/taskcluster/gecko_taskgraph/transforms/upstream_artifact_task.py b/taskcluster/gecko_taskgraph/transforms/upstream_artifact_task.py
new file mode 100644
index 0000000000..62f94a8238
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/upstream_artifact_task.py
@@ -0,0 +1,29 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+Find upstream artifact task.
+"""
+
+from taskgraph.transforms.base import TransformSequence
+
+transforms = TransformSequence()
+
+
+@transforms.add
+def find_upstream_artifact_task(config, jobs):
+    for job in jobs:
+        dep_job = None
+        if job.get("dependent-tasks"):
+            dep_labels = [l for l in job["dependent-tasks"].keys()]
+            for label in dep_labels:
+                if label.endswith("-mac-signing"):
+                    assert (
+                        dep_job is None
+                    ), "Can't determine whether " "{} or {} is dep_job!".format(
+                        dep_job.label, label
+                    )
+                    dep_job = job["dependent-tasks"][label]
+            if dep_job is not None:
+                job["upstream-artifact-task"] = dep_job
+        yield job