Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream

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

22 files changed, 4287 insertions, 0 deletions

diff --git a/taskcluster/gecko_taskgraph/util/__init__.py b/taskcluster/gecko_taskgraph/util/__init__.py
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/util/__init__.py
diff --git a/taskcluster/gecko_taskgraph/util/attributes.py b/taskcluster/gecko_taskgraph/util/attributes.py
new file mode 100644
index 0000000000..0ed0be5a8d
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/util/attributes.py
@@ -0,0 +1,143 @@
+# 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 re
+
+INTEGRATION_PROJECTS = {
+    "autoland",
+}
+
+TRUNK_PROJECTS = INTEGRATION_PROJECTS | {"mozilla-central", "comm-central"}
+
+RELEASE_PROJECTS = {
+    "mozilla-central",
+    "mozilla-beta",
+    "mozilla-release",
+    "mozilla-esr102",
+    "mozilla-esr115",
+    "comm-central",
+    "comm-beta",
+    "comm-esr102",
+    "comm-esr115",
+}
+
+RELEASE_PROMOTION_PROJECTS = {
+    "jamun",
+    "maple",
+    "try",
+    "try-comm-central",
+} | RELEASE_PROJECTS
+
+TEMPORARY_PROJECTS = set(
+    {
+        # When using a "Disposable Project Branch" you can specify your branch here. e.g.:
+        "oak",
+    }
+)
+
+TRY_PROJECTS = {
+    "try",
+    "try-comm-central",
+}
+
+ALL_PROJECTS = RELEASE_PROMOTION_PROJECTS | TRUNK_PROJECTS | TEMPORARY_PROJECTS
+
+RUN_ON_PROJECT_ALIASES = {
+    # key is alias, value is lambda to test it against
+    "all": lambda project: True,
+    "integration": lambda project: (
+        project in INTEGRATION_PROJECTS or project == "toolchains"
+    ),
+    "release": lambda project: (project in RELEASE_PROJECTS or project == "toolchains"),
+    "trunk": lambda project: (project in TRUNK_PROJECTS or project == "toolchains"),
+    "trunk-only": lambda project: project in TRUNK_PROJECTS,
+    "autoland": lambda project: project in ("autoland", "toolchains"),
+    "autoland-only": lambda project: project == "autoland",
+    "mozilla-central": lambda project: project in ("mozilla-central", "toolchains"),
+    "mozilla-central-only": lambda project: project == "mozilla-central",
+}
+
+_COPYABLE_ATTRIBUTES = (
+    "accepted-mar-channel-ids",
+    "artifact_map",
+    "artifact_prefix",
+    "build_platform",
+    "build_type",
+    "l10n_chunk",
+    "locale",
+    "mar-channel-id",
+    "maven_packages",
+    "nightly",
+    "required_signoffs",
+    "shippable",
+    "shipping_phase",
+    "shipping_product",
+    "signed",
+    "stub-installer",
+    "update-channel",
+)
+
+
+def match_run_on_projects(project, run_on_projects):
+    """Determine whether the given project is included in the `run-on-projects`
+    parameter, applying expansions for things like "integration" mentioned in
+    the attribute documentation."""
+    aliases = RUN_ON_PROJECT_ALIASES.keys()
+    run_aliases = set(aliases) & set(run_on_projects)
+    if run_aliases:
+        if any(RUN_ON_PROJECT_ALIASES[alias](project) for alias in run_aliases):
+            return True
+
+    return project in run_on_projects
+
+
+def match_run_on_hg_branches(hg_branch, run_on_hg_branches):
+    """Determine whether the given project is included in the `run-on-hg-branches`
+    parameter. Allows 'all'."""
+    if "all" in run_on_hg_branches:
+        return True
+
+    for expected_hg_branch_pattern in run_on_hg_branches:
+        if re.match(expected_hg_branch_pattern, hg_branch):
+            return True
+
+    return False
+
+
+def copy_attributes_from_dependent_job(dep_job, denylist=()):
+    return {
+        attr: dep_job.attributes[attr]
+        for attr in _COPYABLE_ATTRIBUTES
+        if attr in dep_job.attributes and attr not in denylist
+    }
+
+
+def sorted_unique_list(*args):
+    """Join one or more lists, and return a sorted list of unique members"""
+    combined = set().union(*args)
+    return sorted(combined)
+
+
+def release_level(project):
+    """
+    Whether this is a staging release or not.
+
+    :return str: One of "production" or "staging".
+    """
+    return "production" if project in RELEASE_PROJECTS else "staging"
+
+
+def is_try(params):
+    """
+    Determine whether this graph is being built on a try project or for
+    `mach try fuzzy`.
+    """
+    return "try" in params["project"] or params["try_mode"] == "try_select"
+
+
+def task_name(task):
+    if task.label.startswith(task.kind + "-"):
+        return task.label[len(task.kind) + 1 :]
+    raise AttributeError(f"Task {task.label} does not have a name.")
diff --git a/taskcluster/gecko_taskgraph/util/backstop.py b/taskcluster/gecko_taskgraph/util/backstop.py
new file mode 100644
index 0000000000..26c9a4fb91
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/util/backstop.py
@@ -0,0 +1,84 @@
+# 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 requests import HTTPError
+from taskgraph.util.taskcluster import find_task_id, get_artifact
+
+from gecko_taskgraph.util.attributes import INTEGRATION_PROJECTS, TRY_PROJECTS
+from gecko_taskgraph.util.taskcluster import state_task
+
+BACKSTOP_PUSH_INTERVAL = 20
+BACKSTOP_TIME_INTERVAL = 60 * 4  # minutes
+BACKSTOP_INDEX = "{trust-domain}.v2.{project}.latest.taskgraph.backstop"
+
+
+def is_backstop(
+    params,
+    push_interval=BACKSTOP_PUSH_INTERVAL,
+    time_interval=BACKSTOP_TIME_INTERVAL,
+    trust_domain="gecko",
+    integration_projects=INTEGRATION_PROJECTS,
+):
+    """Determines whether the given parameters represent a backstop push.
+
+    Args:
+        push_interval (int): Number of pushes
+        time_interval (int): Minutes between forced schedules.
+                             Use 0 to disable.
+        trust_domain (str): "gecko" for Firefox, "comm" for Thunderbird
+        integration_projects (set): project that uses backstop optimization
+    Returns:
+        bool: True if this is a backstop, otherwise False.
+    """
+    # In case this is being faked on try.
+    if params.get("backstop", False):
+        return True
+
+    project = params["project"]
+    pushid = int(params["pushlog_id"])
+    pushdate = int(params["pushdate"])
+
+    if project in TRY_PROJECTS:
+        return False
+    if project not in integration_projects:
+        return True
+
+    # On every Nth push, want to run all tasks.
+    if pushid % push_interval == 0:
+        return True
+
+    if time_interval <= 0:
+        return False
+
+    # We also want to ensure we run all tasks at least once per N minutes.
+    subs = {"trust-domain": trust_domain, "project": project}
+    index = BACKSTOP_INDEX.format(**subs)
+
+    try:
+        last_backstop_id = find_task_id(index)
+    except KeyError:
+        # Index wasn't found, implying there hasn't been a backstop push yet.
+        return True
+
+    if state_task(last_backstop_id) in ("failed", "exception"):
+        # If the last backstop failed its decision task, make this a backstop.
+        return True
+
+    try:
+        last_pushdate = get_artifact(last_backstop_id, "public/parameters.yml")[
+            "pushdate"
+        ]
+    except HTTPError as e:
+        # If the last backstop decision task exists in the index, but
+        # parameters.yml isn't available yet, it means the decision task is
+        # still running. If that's the case, we can be pretty sure the time
+        # component will not cause a backstop, so just return False.
+        if e.response.status_code == 404:
+            return False
+        raise
+
+    if (pushdate - last_pushdate) / 60 >= time_interval:
+        return True
+    return False
diff --git a/taskcluster/gecko_taskgraph/util/bugbug.py b/taskcluster/gecko_taskgraph/util/bugbug.py
new file mode 100644
index 0000000000..50e02d69c6
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/util/bugbug.py
@@ -0,0 +1,125 @@
+# 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 sys
+import time
+
+import requests
+from mozbuild.util import memoize
+from taskgraph import create
+from taskgraph.util.taskcluster import requests_retry_session
+
+try:
+    # TODO(py3): use time.monotonic()
+    from time import monotonic
+except ImportError:
+    from time import time as monotonic
+
+BUGBUG_BASE_URL = "https://bugbug.herokuapp.com"
+RETRY_TIMEOUT = 9 * 60  # seconds
+RETRY_INTERVAL = 10  # seconds
+
+# Preset confidence thresholds.
+CT_LOW = 0.7
+CT_MEDIUM = 0.8
+CT_HIGH = 0.9
+
+GROUP_TRANSLATIONS = {
+    "testing/web-platform/tests": "",
+    "testing/web-platform/mozilla/tests": "/_mozilla",
+}
+
+
+def translate_group(group):
+    for prefix, value in GROUP_TRANSLATIONS.items():
+        if group.startswith(prefix):
+            return group.replace(prefix, value)
+
+    return group
+
+
+class BugbugTimeoutException(Exception):
+    pass
+
+
+@memoize
+def get_session():
+    s = requests.Session()
+    s.headers.update({"X-API-KEY": "gecko-taskgraph"})
+    return requests_retry_session(retries=5, session=s)
+
+
+def _write_perfherder_data(lower_is_better):
+    if os.environ.get("MOZ_AUTOMATION", "0") == "1":
+        perfherder_data = {
+            "framework": {"name": "build_metrics"},
+            "suites": [
+                {
+                    "name": suite,
+                    "value": value,
+                    "lowerIsBetter": True,
+                    "shouldAlert": False,
+                    "subtests": [],
+                }
+                for suite, value in lower_is_better.items()
+            ],
+        }
+        print(f"PERFHERDER_DATA: {json.dumps(perfherder_data)}", file=sys.stderr)
+
+
+@memoize
+def push_schedules(branch, rev):
+    # Noop if we're in test-action-callback
+    if create.testing:
+        return
+
+    url = BUGBUG_BASE_URL + "/push/{branch}/{rev}/schedules".format(
+        branch=branch, rev=rev
+    )
+    start = monotonic()
+    session = get_session()
+
+    # On try there is no fallback and pulling is slower, so we allow bugbug more
+    # time to compute the results.
+    # See https://github.com/mozilla/bugbug/issues/1673.
+    timeout = RETRY_TIMEOUT
+    if branch == "try":
+        timeout += int(timeout / 3)
+
+    attempts = timeout / RETRY_INTERVAL
+    i = 0
+    while i < attempts:
+        r = session.get(url)
+        r.raise_for_status()
+
+        if r.status_code != 202:
+            break
+
+        time.sleep(RETRY_INTERVAL)
+        i += 1
+    end = monotonic()
+
+    _write_perfherder_data(
+        lower_is_better={
+            "bugbug_push_schedules_time": end - start,
+            "bugbug_push_schedules_retries": i,
+        }
+    )
+
+    data = r.json()
+    if r.status_code == 202:
+        raise BugbugTimeoutException(f"Timed out waiting for result from '{url}'")
+
+    if "groups" in data:
+        data["groups"] = {translate_group(k): v for k, v in data["groups"].items()}
+
+    if "config_groups" in data:
+        data["config_groups"] = {
+            translate_group(k): v for k, v in data["config_groups"].items()
+        }
+
+    return data
diff --git a/taskcluster/gecko_taskgraph/util/cached_tasks.py b/taskcluster/gecko_taskgraph/util/cached_tasks.py
new file mode 100644
index 0000000000..fff9bb9844
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/util/cached_tasks.py
@@ -0,0 +1,82 @@
+# 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 time
+
+TARGET_CACHE_INDEX = "{trust_domain}.cache.level-{level}.{type}.{name}.hash.{digest}"
+EXTRA_CACHE_INDEXES = [
+    "{trust_domain}.cache.level-{level}.{type}.{name}.latest",
+    "{trust_domain}.cache.level-{level}.{type}.{name}.pushdate.{build_date_long}",
+]
+
+
+def add_optimization(
+    config, taskdesc, cache_type, cache_name, digest=None, digest_data=None
+):
+    """
+    Allow the results of this task to be cached. This adds index routes to the
+    task so it can be looked up for future runs, and optimization hints so that
+    cached artifacts can be found. Exactly one of `digest` and `digest_data`
+    must be passed.
+
+    :param TransformConfig config: The configuration for the kind being transformed.
+    :param dict taskdesc: The description of the current task.
+    :param str cache_type: The type of task result being cached.
+    :param str cache_name: The name of the object being cached.
+    :param digest: A unique string indentifying this version of the artifacts
+        being generated. Typically this will be the hash of inputs to the task.
+    :type digest: bytes or None
+    :param digest_data: A list of bytes representing the inputs of this task.
+        They will be concatenated and hashed to create the digest for this
+        task.
+    :type digest_data: list of bytes or None
+    """
+    cached_task = taskdesc.get("attributes", {}).get("cached_task")
+    if cached_task is False:
+        return
+
+    if (digest is None) == (digest_data is None):
+        raise Exception("Must pass exactly one of `digest` and `digest_data`.")
+    if digest is None:
+        digest = hashlib.sha256("\n".join(digest_data).encode("utf-8")).hexdigest()
+
+    subs = {
+        "trust_domain": config.graph_config["trust-domain"],
+        "type": cache_type,
+        "name": cache_name,
+        "digest": digest,
+    }
+
+    # We'll try to find a cached version of the toolchain at levels above
+    # and including the current level, starting at the highest level.
+    index_routes = []
+    for level in reversed(range(int(config.params["level"]), 4)):
+        subs["level"] = level
+        index_routes.append(TARGET_CACHE_INDEX.format(**subs))
+    taskdesc["optimization"] = {"index-search": index_routes}
+
+    # ... and cache at the lowest level.
+    taskdesc.setdefault("routes", []).append(
+        f"index.{TARGET_CACHE_INDEX.format(**subs)}"
+    )
+
+    # ... and add some extra routes for humans
+    subs["build_date_long"] = time.strftime(
+        "%Y.%m.%d.%Y%m%d%H%M%S", time.gmtime(config.params["build_date"])
+    )
+    taskdesc["routes"].extend(
+        [f"index.{route.format(**subs)}" for route in EXTRA_CACHE_INDEXES]
+    )
+
+    taskdesc["attributes"]["cached_task"] = {
+        "type": cache_type,
+        "name": cache_name,
+        "digest": digest,
+    }
+
+    # Allow future pushes to find this task before it completes
+    # Implementation in morphs
+    taskdesc["attributes"]["eager_indexes"] = [TARGET_CACHE_INDEX.format(**subs)]
diff --git a/taskcluster/gecko_taskgraph/util/chunking.py b/taskcluster/gecko_taskgraph/util/chunking.py
new file mode 100644
index 0000000000..2c6c429a2c
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/util/chunking.py
@@ -0,0 +1,315 @@
+# 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/.
+
+
+"""Utility functions to handle test chunking."""
+
+import json
+import logging
+import os
+from abc import ABCMeta, abstractmethod
+
+from manifestparser import TestManifest
+from manifestparser.filters import chunk_by_runtime, tags
+from mozbuild.util import memoize
+from moztest.resolve import TEST_SUITES, TestManifestLoader, TestResolver
+
+from gecko_taskgraph import GECKO
+from gecko_taskgraph.util.bugbug import CT_LOW, BugbugTimeoutException, push_schedules
+
+logger = logging.getLogger(__name__)
+here = os.path.abspath(os.path.dirname(__file__))
+resolver = TestResolver.from_environment(cwd=here, loader_cls=TestManifestLoader)
+
+
+def guess_mozinfo_from_task(task, repo=""):
+    """Attempt to build a mozinfo dict from a task definition.
+
+    This won't be perfect and many values used in the manifests will be missing. But
+    it should cover most of the major ones and be "good enough" for chunking in the
+    taskgraph.
+
+    Args:
+        task (dict): A task definition.
+
+    Returns:
+        A dict that can be used as a mozinfo replacement.
+    """
+    setting = task["test-setting"]
+    arch = setting["platform"]["arch"]
+    p_os = setting["platform"]["os"]
+
+    info = {
+        "asan": setting["build"].get("asan", False),
+        "bits": 32 if "32" in arch else 64,
+        "ccov": setting["build"].get("ccov", False),
+        "debug": setting["build"]["type"] in ("debug", "debug-isolated-process"),
+        "e10s": not setting["runtime"].get("1proc", False),
+        "no-fission": "no-fission" in setting["runtime"].keys(),
+        "fission": any(
+            "1proc" not in key or "no-fission" not in key
+            for key in setting["runtime"].keys()
+        ),
+        "headless": "-headless" in task["test-name"],
+        "condprof": "conditioned_profile" in setting["runtime"].keys(),
+        "tsan": setting["build"].get("tsan", False),
+        "xorigin": any("xorigin" in key for key in setting["runtime"].keys()),
+        "socketprocess_networking": "socketprocess_networking"
+        in setting["runtime"].keys(),
+        "nightly_build": repo in ["mozilla-central", "autoland", "try", ""],  # trunk
+        "http3": "http3" in setting["runtime"].keys(),
+    }
+    for platform in ("android", "linux", "mac", "win"):
+        if p_os["name"].startswith(platform):
+            info["os"] = platform
+            break
+    else:
+        raise ValueError("{} is not a known platform!".format(p_os["name"]))
+
+    # crashreporter is disabled for asan / tsan builds
+    if info["asan"] or info["tsan"]:
+        info["crashreporter"] = False
+    else:
+        info["crashreporter"] = True
+
+    info["appname"] = "fennec" if info["os"] == "android" else "firefox"
+
+    # guess processor
+    if arch == "aarch64":
+        info["processor"] = "aarch64"
+    elif info["os"] == "android" and "arm" in arch:
+        info["processor"] = "arm"
+    elif info["bits"] == 32:
+        info["processor"] = "x86"
+    else:
+        info["processor"] = "x86_64"
+
+    # guess toolkit
+    if info["os"] == "android":
+        info["toolkit"] = "android"
+    elif info["os"] == "win":
+        info["toolkit"] = "windows"
+    elif info["os"] == "mac":
+        info["toolkit"] = "cocoa"
+    else:
+        info["toolkit"] = "gtk"
+
+    # guess os_version
+    os_versions = {
+        ("linux", "1804"): "18.04",
+        ("macosx", "1015"): "10.15",
+        ("macosx", "1100"): "11.00",
+        ("windows", "7"): "6.1",
+        ("windows", "10"): "10.0",
+    }
+    for (name, old_ver), new_ver in os_versions.items():
+        if p_os["name"] == name and p_os["version"] == old_ver:
+            info["os_version"] = new_ver
+            break
+
+    return info
+
+
+@memoize
+def get_runtimes(platform, suite_name):
+    if not suite_name or not platform:
+        raise TypeError("suite_name and platform cannot be empty.")
+
+    base = os.path.join(GECKO, "testing", "runtimes", "manifest-runtimes-{}.json")
+    for key in ("android", "windows"):
+        if key in platform:
+            path = base.format(key)
+            break
+    else:
+        path = base.format("unix")
+
+    if not os.path.exists(path):
+        raise OSError(f"manifest runtime file at {path} not found.")
+
+    with open(path) as fh:
+        return json.load(fh)[suite_name]
+
+
+def chunk_manifests(suite, platform, chunks, manifests):
+    """Run the chunking algorithm.
+
+    Args:
+        platform (str): Platform used to find runtime info.
+        chunks (int): Number of chunks to split manifests into.
+        manifests(list): Manifests to chunk.
+
+    Returns:
+        A list of length `chunks` where each item contains a list of manifests
+        that run in that chunk.
+    """
+    manifests = set(manifests)
+
+    if "web-platform-tests" not in suite:
+        runtimes = {
+            k: v for k, v in get_runtimes(platform, suite).items() if k in manifests
+        }
+        return [
+            c[1]
+            for c in chunk_by_runtime(None, chunks, runtimes).get_chunked_manifests(
+                manifests
+            )
+        ]
+
+    # Keep track of test paths for each chunk, and the runtime information.
+    chunked_manifests = [[] for _ in range(chunks)]
+
+    # Spread out the test manifests evenly across all chunks.
+    for index, key in enumerate(sorted(manifests)):
+        chunked_manifests[index % chunks].append(key)
+
+    # One last sort by the number of manifests. Chunk size should be more or less
+    # equal in size.
+    chunked_manifests.sort(key=lambda x: len(x))
+
+    # Return just the chunked test paths.
+    return chunked_manifests
+
+
+class BaseManifestLoader(metaclass=ABCMeta):
+    def __init__(self, params):
+        self.params = params
+
+    @abstractmethod
+    def get_manifests(self, flavor, subsuite, mozinfo):
+        """Compute which manifests should run for the given flavor, subsuite and mozinfo.
+
+        This function returns skipped manifests separately so that more balanced
+        chunks can be achieved by only considering "active" manifests in the
+        chunking algorithm.
+
+        Args:
+            flavor (str): The suite to run. Values are defined by the 'build_flavor' key
+                in `moztest.resolve.TEST_SUITES`.
+            subsuite (str): The subsuite to run or 'undefined' to denote no subsuite.
+            mozinfo (frozenset): Set of data in the form of (<key>, <value>) used
+                                 for filtering.
+
+        Returns:
+            A tuple of two manifest lists. The first is the set of active manifests (will
+            run at least one test. The second is a list of skipped manifests (all tests are
+            skipped).
+        """
+
+
+class DefaultLoader(BaseManifestLoader):
+    """Load manifests using metadata from the TestResolver."""
+
+    @memoize
+    def get_tests(self, suite):
+        suite_definition = TEST_SUITES[suite]
+        return list(
+            resolver.resolve_tests(
+                flavor=suite_definition["build_flavor"],
+                subsuite=suite_definition.get("kwargs", {}).get(
+                    "subsuite", "undefined"
+                ),
+            )
+        )
+
+    @memoize
+    def get_manifests(self, suite, mozinfo):
+        mozinfo = dict(mozinfo)
+        # Compute all tests for the given suite/subsuite.
+        tests = self.get_tests(suite)
+
+        # TODO: the only exception here is we schedule webgpu as that is a --tag
+        if "web-platform-tests" in suite:
+            manifests = set()
+            for t in tests:
+                manifests.add(t["manifest"])
+            return {
+                "active": list(manifests),
+                "skipped": [],
+                "other_dirs": dict.fromkeys(manifests, ""),
+            }
+
+        manifests = {chunk_by_runtime.get_manifest(t) for t in tests}
+
+        filters = None
+        if mozinfo["condprof"]:
+            filters = [tags(["condprof"])]
+
+        # Compute  the active tests.
+        m = TestManifest()
+        m.tests = tests
+        tests = m.active_tests(disabled=False, exists=False, filters=filters, **mozinfo)
+        active = {}
+        # map manifests and 'other' directories included
+        for t in tests:
+            mp = chunk_by_runtime.get_manifest(t)
+            active.setdefault(mp, [])
+
+            if not mp.startswith(t["dir_relpath"]):
+                active[mp].append(t["dir_relpath"])
+
+        skipped = manifests - set(active.keys())
+        other = {}
+        for m in active:
+            if len(active[m]) > 0:
+                other[m] = list(set(active[m]))
+        return {
+            "active": list(active.keys()),
+            "skipped": list(skipped),
+            "other_dirs": other,
+        }
+
+
+class BugbugLoader(DefaultLoader):
+    """Load manifests using metadata from the TestResolver, and then
+    filter them based on a query to bugbug."""
+
+    CONFIDENCE_THRESHOLD = CT_LOW
+
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        self.timedout = False
+
+    @memoize
+    def get_manifests(self, suite, mozinfo):
+        manifests = super().get_manifests(suite, mozinfo)
+
+        # Don't prune any manifests if we're on a backstop push or there was a timeout.
+        if self.params["backstop"] or self.timedout:
+            return manifests
+
+        try:
+            data = push_schedules(self.params["project"], self.params["head_rev"])
+        except BugbugTimeoutException:
+            logger.warning("Timed out waiting for bugbug, loading all test manifests.")
+            self.timedout = True
+            return self.get_manifests(suite, mozinfo)
+
+        bugbug_manifests = {
+            m
+            for m, c in data.get("groups", {}).items()
+            if c >= self.CONFIDENCE_THRESHOLD
+        }
+
+        manifests["active"] = list(set(manifests["active"]) & bugbug_manifests)
+        manifests["skipped"] = list(set(manifests["skipped"]) & bugbug_manifests)
+        return manifests
+
+
+manifest_loaders = {
+    "bugbug": BugbugLoader,
+    "default": DefaultLoader,
+}
+
+_loader_cache = {}
+
+
+def get_manifest_loader(name, params):
+    # Ensure we never create more than one instance of the same loader type for
+    # performance reasons.
+    if name in _loader_cache:
+        return _loader_cache[name]
+
+    loader = manifest_loaders[name](dict(params))
+    _loader_cache[name] = loader
+    return loader
diff --git a/taskcluster/gecko_taskgraph/util/copy_task.py b/taskcluster/gecko_taskgraph/util/copy_task.py
new file mode 100644
index 0000000000..0aaf43361e
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/util/copy_task.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 mozbuild.util import ReadOnlyDict
+from taskgraph.task import Task
+
+immutable_types = {int, float, bool, str, type(None), ReadOnlyDict}
+
+
+def copy_task(obj):
+    """
+    Perform a deep copy of a task that has a tree-like structure.
+
+    Unlike copy.deepcopy, this does *not* support copying graph-like structure,
+    but it does it more efficiently than deepcopy.
+    """
+    ty = type(obj)
+    if ty in immutable_types:
+        return obj
+    if ty is dict:
+        return {k: copy_task(v) for k, v in obj.items()}
+    if ty is list:
+        return [copy_task(elt) for elt in obj]
+    if ty is Task:
+        task = Task(
+            kind=copy_task(obj.kind),
+            label=copy_task(obj.label),
+            attributes=copy_task(obj.attributes),
+            task=copy_task(obj.task),
+            description=copy_task(obj.description),
+            optimization=copy_task(obj.optimization),
+            dependencies=copy_task(obj.dependencies),
+            soft_dependencies=copy_task(obj.soft_dependencies),
+            if_dependencies=copy_task(obj.if_dependencies),
+        )
+        if obj.task_id:
+            task.task_id = obj.task_id
+        return task
+    raise NotImplementedError(f"copying '{ty}' from '{obj}'")
diff --git a/taskcluster/gecko_taskgraph/util/declarative_artifacts.py b/taskcluster/gecko_taskgraph/util/declarative_artifacts.py
new file mode 100644
index 0000000000..545472dec3
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/util/declarative_artifacts.py
@@ -0,0 +1,92 @@
+# 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 re
+
+from gecko_taskgraph.util.scriptworker import (
+    generate_beetmover_artifact_map,
+    generate_beetmover_upstream_artifacts,
+)
+
+_ARTIFACT_ID_PER_PLATFORM = {
+    "android-aarch64-opt": "{package}-default-arm64-v8a",
+    "android-arm-opt": "{package}-default-armeabi-v7a",
+    "android-x86-opt": "{package}-default-x86",
+    "android-x86_64-opt": "{package}-default-x86_64",
+    "android-geckoview-fat-aar-opt": "{package}-default",
+    "android-aarch64-shippable": "{package}{update_channel}-omni-arm64-v8a",
+    "android-aarch64-shippable-lite": "{package}{update_channel}-arm64-v8a",
+    "android-arm-shippable": "{package}{update_channel}-omni-armeabi-v7a",
+    "android-arm-shippable-lite": "{package}{update_channel}-armeabi-v7a",
+    "android-x86-shippable": "{package}{update_channel}-omni-x86",
+    "android-x86-shippable-lite": "{package}{update_channel}-x86",
+    "android-x86_64-shippable": "{package}{update_channel}-omni-x86_64",
+    "android-x86_64-shippable-lite": "{package}{update_channel}-x86_64",
+    "android-geckoview-fat-aar-shippable": "{package}{update_channel}-omni",
+    "android-geckoview-fat-aar-shippable-lite": "{package}{update_channel}",
+}
+
+
+def get_geckoview_artifact_map(config, job):
+    return generate_beetmover_artifact_map(
+        config,
+        job,
+        **get_geckoview_template_vars(
+            config,
+            job["attributes"]["build_platform"],
+            job["maven-package"],
+            job["attributes"].get("update-channel"),
+        ),
+    )
+
+
+def get_geckoview_upstream_artifacts(config, job, package, platform=""):
+    if not platform:
+        platform = job["attributes"]["build_platform"]
+    upstream_artifacts = generate_beetmover_upstream_artifacts(
+        config,
+        job,
+        platform="",
+        **get_geckoview_template_vars(
+            config, platform, package, job["attributes"].get("update-channel")
+        ),
+    )
+    return [
+        {key: value for key, value in upstream_artifact.items() if key != "locale"}
+        for upstream_artifact in upstream_artifacts
+    ]
+
+
+def get_geckoview_template_vars(config, platform, package, update_channel):
+    version_groups = re.match(r"(\d+).(\d+).*", config.params["version"])
+    if version_groups:
+        major_version, minor_version = version_groups.groups()
+
+    return {
+        "artifact_id": get_geckoview_artifact_id(
+            config,
+            platform,
+            package,
+            update_channel,
+        ),
+        "build_date": config.params["moz_build_date"],
+        "major_version": major_version,
+        "minor_version": minor_version,
+    }
+
+
+def get_geckoview_artifact_id(config, platform, package, update_channel=None):
+    if update_channel == "release":
+        update_channel = ""
+    elif update_channel is not None:
+        update_channel = f"-{update_channel}"
+    else:
+        # For shippable builds, mozharness defaults to using
+        # "nightly-{project}" for the update channel.  For other builds, the
+        # update channel is not set, but the value is not substituted.
+        update_channel = "-nightly-{}".format(config.params["project"])
+    return _ARTIFACT_ID_PER_PLATFORM[platform].format(
+        update_channel=update_channel, package=package
+    )
diff --git a/taskcluster/gecko_taskgraph/util/docker.py b/taskcluster/gecko_taskgraph/util/docker.py
new file mode 100644
index 0000000000..e8de7d1fdb
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/util/docker.py
@@ -0,0 +1,333 @@
+# 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 os
+import re
+import sys
+from collections.abc import Mapping
+from urllib.parse import quote, urlencode, urlunparse
+
+import requests
+import requests_unixsocket
+from mozbuild.util import memoize
+from mozpack.archive import create_tar_gz_from_files
+from mozpack.files import GeneratedFile
+from taskgraph.util.yaml import load_yaml
+
+from .. import GECKO
+
+IMAGE_DIR = os.path.join(GECKO, "taskcluster", "docker")
+
+
+def docker_url(path, **kwargs):
+    docker_socket = os.environ.get("DOCKER_SOCKET", "/var/run/docker.sock")
+    return urlunparse(
+        ("http+unix", quote(docker_socket, safe=""), path, "", urlencode(kwargs), "")
+    )
+
+
+def post_to_docker(tar, api_path, **kwargs):
+    """POSTs a tar file to a given docker API path.
+
+    The tar argument can be anything that can be passed to requests.post()
+    as data (e.g. iterator or file object).
+    The extra keyword arguments are passed as arguments to the docker API.
+    """
+    # requests-unixsocket doesn't honor requests timeouts
+    # See https://github.com/msabramo/requests-unixsocket/issues/44
+    # We have some large docker images that trigger the default timeout,
+    # so we increase the requests-unixsocket timeout here.
+    session = requests.Session()
+    session.mount(
+        requests_unixsocket.DEFAULT_SCHEME,
+        requests_unixsocket.UnixAdapter(timeout=120),
+    )
+    req = session.post(
+        docker_url(api_path, **kwargs),
+        data=tar,
+        stream=True,
+        headers={"Content-Type": "application/x-tar"},
+    )
+    if req.status_code != 200:
+        message = req.json().get("message")
+        if not message:
+            message = f"docker API returned HTTP code {req.status_code}"
+        raise Exception(message)
+    status_line = {}
+
+    buf = b""
+    for content in req.iter_content(chunk_size=None):
+        if not content:
+            continue
+        # Sometimes, a chunk of content is not a complete json, so we cumulate
+        # with leftovers from previous iterations.
+        buf += content
+        try:
+            data = json.loads(buf)
+        except Exception:
+            continue
+        buf = b""
+        # data is sometimes an empty dict.
+        if not data:
+            continue
+        # Mimick how docker itself presents the output. This code was tested
+        # with API version 1.18 and 1.26.
+        if "status" in data:
+            if "id" in data:
+                if sys.stderr.isatty():
+                    total_lines = len(status_line)
+                    line = status_line.setdefault(data["id"], total_lines)
+                    n = total_lines - line
+                    if n > 0:
+                        # Move the cursor up n lines.
+                        sys.stderr.write(f"\033[{n}A")
+                    # Clear line and move the cursor to the beginning of it.
+                    sys.stderr.write("\033[2K\r")
+                    sys.stderr.write(
+                        "{}: {} {}\n".format(
+                            data["id"], data["status"], data.get("progress", "")
+                        )
+                    )
+                    if n > 1:
+                        # Move the cursor down n - 1 lines, which, considering
+                        # the carriage return on the last write, gets us back
+                        # where we started.
+                        sys.stderr.write(f"\033[{n - 1}B")
+                else:
+                    status = status_line.get(data["id"])
+                    # Only print status changes.
+                    if status != data["status"]:
+                        sys.stderr.write("{}: {}\n".format(data["id"], data["status"]))
+                        status_line[data["id"]] = data["status"]
+            else:
+                status_line = {}
+                sys.stderr.write("{}\n".format(data["status"]))
+        elif "stream" in data:
+            sys.stderr.write(data["stream"])
+        elif "aux" in data:
+            sys.stderr.write(repr(data["aux"]))
+        elif "error" in data:
+            sys.stderr.write("{}\n".format(data["error"]))
+            # Sadly, docker doesn't give more than a plain string for errors,
+            # so the best we can do to propagate the error code from the command
+            # that failed is to parse the error message...
+            errcode = 1
+            m = re.search(r"returned a non-zero code: (\d+)", data["error"])
+            if m:
+                errcode = int(m.group(1))
+            sys.exit(errcode)
+        else:
+            raise NotImplementedError(repr(data))
+        sys.stderr.flush()
+
+
+def docker_image(name, by_tag=False):
+    """
+    Resolve in-tree prebuilt docker image to ``<registry>/<repository>@sha256:<digest>``,
+    or ``<registry>/<repository>:<tag>`` if `by_tag` is `True`.
+    """
+    try:
+        with open(os.path.join(IMAGE_DIR, name, "REGISTRY")) as f:
+            registry = f.read().strip()
+    except OSError:
+        with open(os.path.join(IMAGE_DIR, "REGISTRY")) as f:
+            registry = f.read().strip()
+
+    if not by_tag:
+        hashfile = os.path.join(IMAGE_DIR, name, "HASH")
+        try:
+            with open(hashfile) as f:
+                return f"{registry}/{name}@{f.read().strip()}"
+        except OSError:
+            raise Exception(f"Failed to read HASH file {hashfile}")
+
+    try:
+        with open(os.path.join(IMAGE_DIR, name, "VERSION")) as f:
+            tag = f.read().strip()
+    except OSError:
+        tag = "latest"
+    return f"{registry}/{name}:{tag}"
+
+
+class VoidWriter:
+    """A file object with write capabilities that does nothing with the written
+    data."""
+
+    def write(self, buf):
+        pass
+
+
+def generate_context_hash(topsrcdir, image_path, image_name, args):
+    """Generates a sha256 hash for context directory used to build an image."""
+
+    return stream_context_tar(
+        topsrcdir, image_path, VoidWriter(), image_name, args=args
+    )
+
+
+class HashingWriter:
+    """A file object with write capabilities that hashes the written data at
+    the same time it passes down to a real file object."""
+
+    def __init__(self, writer):
+        self._hash = hashlib.sha256()
+        self._writer = writer
+
+    def write(self, buf):
+        self._hash.update(buf)
+        self._writer.write(buf)
+
+    def hexdigest(self):
+        return self._hash.hexdigest()
+
+
+def create_context_tar(topsrcdir, context_dir, out_path, image_name, args):
+    """Create a context tarball.
+
+    A directory ``context_dir`` containing a Dockerfile will be assembled into
+    a gzipped tar file at ``out_path``.
+
+    We also scan the source Dockerfile for special syntax that influences
+    context generation.
+
+    If a line in the Dockerfile has the form ``# %include <path>``,
+    the relative path specified on that line will be matched against
+    files in the source repository and added to the context under the
+    path ``topsrcdir/``. If an entry is a directory, we add all files
+    under that directory.
+
+    Returns the SHA-256 hex digest of the created archive.
+    """
+    with open(out_path, "wb") as fh:
+        return stream_context_tar(
+            topsrcdir,
+            context_dir,
+            fh,
+            image_name=image_name,
+            args=args,
+        )
+
+
+def stream_context_tar(topsrcdir, context_dir, out_file, image_name, args):
+    """Like create_context_tar, but streams the tar file to the `out_file` file
+    object."""
+    archive_files = {}
+    content = []
+
+    context_dir = os.path.join(topsrcdir, context_dir)
+
+    for root, dirs, files in os.walk(context_dir):
+        for f in files:
+            source_path = os.path.join(root, f)
+            archive_path = source_path[len(context_dir) + 1 :]
+            archive_files[archive_path] = source_path
+
+    # Parse Dockerfile for special syntax of extra files to include.
+    with open(os.path.join(context_dir, "Dockerfile"), "r") as fh:
+        for line in fh:
+            content.append(line)
+
+            if not line.startswith("# %include"):
+                continue
+
+            p = line[len("# %include ") :].strip()
+            if os.path.isabs(p):
+                raise Exception("extra include path cannot be absolute: %s" % p)
+
+            fs_path = os.path.normpath(os.path.join(topsrcdir, p))
+            # Check for filesystem traversal exploits.
+            if not fs_path.startswith(topsrcdir):
+                raise Exception("extra include path outside topsrcdir: %s" % p)
+
+            if not os.path.exists(fs_path):
+                raise Exception("extra include path does not exist: %s" % p)
+
+            if os.path.isdir(fs_path):
+                for root, dirs, files in os.walk(fs_path):
+                    for f in files:
+                        source_path = os.path.join(root, f)
+                        rel = source_path[len(fs_path) + 1 :]
+                        archive_path = os.path.join("topsrcdir", p, rel)
+                        archive_files[archive_path] = source_path
+            else:
+                archive_path = os.path.join("topsrcdir", p)
+                archive_files[archive_path] = fs_path
+
+    archive_files["Dockerfile"] = GeneratedFile("".join(content).encode("utf-8"))
+
+    writer = HashingWriter(out_file)
+    create_tar_gz_from_files(writer, archive_files, f"{image_name}.tar")
+    return writer.hexdigest()
+
+
+class ImagePathsMap(Mapping):
+    """ImagePathsMap contains the mapping of Docker image names to their
+    context location in the filesystem. The register function allows Thunderbird
+    to define additional images under comm/taskcluster.
+    """
+
+    def __init__(self, config_path, image_dir=IMAGE_DIR):
+        config = load_yaml(GECKO, config_path)
+        self.__update_image_paths(config["jobs"], image_dir)
+
+    def __getitem__(self, key):
+        return self.__dict__[key]
+
+    def __iter__(self):
+        return iter(self.__dict__)
+
+    def __len__(self):
+        return len(self.__dict__)
+
+    def __update_image_paths(self, jobs, image_dir):
+        self.__dict__.update(
+            {
+                k: os.path.join(image_dir, v.get("definition", k))
+                for k, v in jobs.items()
+            }
+        )
+
+    def register(self, jobs_config_path, image_dir):
+        """Register additional image_paths. In this case, there is no 'jobs'
+        key in the loaded YAML as this file is loaded via jobs-from in kind.yml."""
+        jobs = load_yaml(GECKO, jobs_config_path)
+        self.__update_image_paths(jobs, image_dir)
+
+
+image_paths = ImagePathsMap("taskcluster/ci/docker-image/kind.yml")
+
+
+def image_path(name):
+    if name in image_paths:
+        return image_paths[name]
+    return os.path.join(IMAGE_DIR, name)
+
+
+@memoize
+def parse_volumes(image):
+    """Parse VOLUME entries from a Dockerfile for an image."""
+    volumes = set()
+
+    path = image_path(image)
+
+    with open(os.path.join(path, "Dockerfile"), "rb") as fh:
+        for line in fh:
+            line = line.strip()
+            # We assume VOLUME definitions don't use ARGS.
+            if not line.startswith(b"VOLUME "):
+                continue
+
+            v = line.split(None, 1)[1]
+            if v.startswith(b"["):
+                raise ValueError(
+                    "cannot parse array syntax for VOLUME; "
+                    "convert to multiple entries"
+                )
+
+            volumes |= {v.decode("utf-8") for v in v.split()}
+
+    return volumes
diff --git a/taskcluster/gecko_taskgraph/util/hash.py b/taskcluster/gecko_taskgraph/util/hash.py
new file mode 100644
index 0000000000..485c9a7c48
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/util/hash.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/.
+
+import hashlib
+
+import mozpack.path as mozpath
+from mozbuild.util import memoize
+from mozversioncontrol import get_repository_object
+
+
+@memoize
+def hash_path(path):
+    """Hash a single file.
+
+    Returns the SHA-256 hash in hex form.
+    """
+    with open(path, mode="rb") as fh:
+        return hashlib.sha256(fh.read()).hexdigest()
+
+
+@memoize
+def get_file_finder(base_path):
+    from pathlib import Path
+
+    repo = get_repository_object(base_path)
+    if repo:
+        files = repo.get_tracked_files_finder(base_path)
+        if files:
+            return files
+        else:
+            return None
+    else:
+        return get_repository_object(Path(base_path)).get_tracked_files_finder(
+            base_path
+        )
+
+
+def hash_paths(base_path, patterns):
+    """
+    Give a list of path patterns, return a digest of the contents of all
+    the corresponding files, similarly to git tree objects or mercurial
+    manifests.
+
+    Each file is hashed. The list of all hashes and file paths is then
+    itself hashed to produce the result.
+    """
+    finder = get_file_finder(base_path)
+    h = hashlib.sha256()
+    files = {}
+    if finder:
+        for pattern in patterns:
+            found = list(finder.find(pattern))
+            if found:
+                files.update(found)
+            else:
+                raise Exception("%s did not match anything" % pattern)
+        for path in sorted(files.keys()):
+            if path.endswith((".pyc", ".pyd", ".pyo")):
+                continue
+            h.update(
+                "{} {}\n".format(
+                    hash_path(mozpath.abspath(mozpath.join(base_path, path))),
+                    mozpath.normsep(path),
+                ).encode("utf-8")
+            )
+
+    return h.hexdigest()
diff --git a/taskcluster/gecko_taskgraph/util/hg.py b/taskcluster/gecko_taskgraph/util/hg.py
new file mode 100644
index 0000000000..18a92fbd0d
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/util/hg.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/.
+
+
+import logging
+import subprocess
+
+import requests
+from mozbuild.util import memoize
+from redo import retry
+
+logger = logging.getLogger(__name__)
+
+PUSHLOG_CHANGESET_TMPL = (
+    "{repository}/json-pushes?version=2&changeset={revision}&tipsonly=1"
+)
+PUSHLOG_PUSHES_TMPL = (
+    "{repository}/json-pushes/?version=2&startID={push_id_start}&endID={push_id_end}"
+)
+
+
+def _query_pushlog(url):
+    response = retry(
+        requests.get,
+        attempts=5,
+        sleeptime=10,
+        args=(url,),
+        kwargs={"timeout": 60, "headers": {"User-Agent": "TaskCluster"}},
+    )
+
+    return response.json()["pushes"]
+
+
+def find_hg_revision_push_info(repository, revision):
+    """Given the parameters for this action and a revision, find the
+    pushlog_id of the revision."""
+    url = PUSHLOG_CHANGESET_TMPL.format(repository=repository, revision=revision)
+
+    pushes = _query_pushlog(url)
+
+    if len(pushes) != 1:
+        raise RuntimeError(
+            "Found {} pushlog_ids, expected 1, for {} revision {}: {}".format(
+                len(pushes), repository, revision, pushes
+            )
+        )
+
+    pushid = list(pushes.keys())[0]
+    return {
+        "pushdate": pushes[pushid]["date"],
+        "pushid": pushid,
+        "user": pushes[pushid]["user"],
+    }
+
+
+@memoize
+def get_push_data(repository, project, push_id_start, push_id_end):
+    url = PUSHLOG_PUSHES_TMPL.format(
+        repository=repository,
+        push_id_start=push_id_start - 1,
+        push_id_end=push_id_end,
+    )
+
+    try:
+        pushes = _query_pushlog(url)
+
+        return {
+            push_id: pushes[str(push_id)]
+            for push_id in range(push_id_start, push_id_end + 1)
+        }
+
+    # In the event of request times out, requests will raise a TimeoutError.
+    except requests.exceptions.Timeout:
+        logger.warning("json-pushes timeout")
+
+    # In the event of a network problem (e.g. DNS failure, refused connection, etc),
+    # requests will raise a ConnectionError.
+    except requests.exceptions.ConnectionError:
+        logger.warning("json-pushes connection error")
+
+    # In the event of the rare invalid HTTP response(e.g 404, 401),
+    # requests will raise an HTTPError exception
+    except requests.exceptions.HTTPError:
+        logger.warning("Bad Http response")
+
+    # When we get invalid JSON (i.e. 500 error), it results in a ValueError (bug 1313426)
+    except ValueError as error:
+        logger.warning(f"Invalid JSON, possible server error: {error}")
+
+    # We just print the error out as a debug message if we failed to catch the exception above
+    except requests.exceptions.RequestException as error:
+        logger.warning(error)
+
+    return None
+
+
+@memoize
+def get_json_automationrelevance(repository, revision):
+    url = "{}/json-automationrelevance/{}".format(repository.rstrip("/"), revision)
+    logger.debug("Querying version control for metadata: %s", url)
+
+    def get_automationrelevance():
+        response = requests.get(url, timeout=30)
+        return response.json()
+
+    return retry(get_automationrelevance, attempts=10, sleeptime=10)
+
+
+def get_hg_revision_branch(root, revision):
+    """Given the parameters for a revision, find the hg_branch (aka
+    relbranch) of the revision."""
+    return subprocess.check_output(
+        [
+            "hg",
+            "identify",
+            "-T",
+            "{branch}",
+            "--rev",
+            revision,
+        ],
+        cwd=root,
+        universal_newlines=True,
+    )
+
+
+# For these functions, we assume that run-task has correctly checked out the
+# revision indicated by GECKO_HEAD_REF, so all that remains is to see what the
+# current revision is.  Mercurial refers to that as `.`.
+def get_hg_commit_message(root, rev="."):
+    return subprocess.check_output(
+        ["hg", "log", "-r", rev, "-T", "{desc}"], cwd=root, universal_newlines=True
+    )
+
+
+def calculate_head_rev(root):
+    return subprocess.check_output(
+        ["hg", "log", "-r", ".", "-T", "{node}"], cwd=root, universal_newlines=True
+    )
diff --git a/taskcluster/gecko_taskgraph/util/partials.py b/taskcluster/gecko_taskgraph/util/partials.py
new file mode 100644
index 0000000000..1a3affcc42
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/util/partials.py
@@ -0,0 +1,297 @@
+# 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
+
+import redo
+import requests
+
+from gecko_taskgraph.util.scriptworker import (
+    BALROG_SCOPE_ALIAS_TO_PROJECT,
+    BALROG_SERVER_SCOPES,
+)
+
+logger = logging.getLogger(__name__)
+
+PLATFORM_RENAMES = {
+    "windows2012-32": "win32",
+    "windows2012-64": "win64",
+    "windows2012-aarch64": "win64-aarch64",
+    "osx-cross": "macosx64",
+    "osx": "macosx64",
+}
+
+BALROG_PLATFORM_MAP = {
+    "linux": ["Linux_x86-gcc3"],
+    "linux32": ["Linux_x86-gcc3"],
+    "linux64": ["Linux_x86_64-gcc3"],
+    "linux64-asan-reporter": ["Linux_x86_64-gcc3-asan"],
+    "macosx64": [
+        "Darwin_x86_64-gcc3-u-i386-x86_64",
+        "Darwin_x86-gcc3-u-i386-x86_64",
+        "Darwin_aarch64-gcc3",
+        "Darwin_x86-gcc3",
+        "Darwin_x86_64-gcc3",
+    ],
+    "win32": ["WINNT_x86-msvc", "WINNT_x86-msvc-x86", "WINNT_x86-msvc-x64"],
+    "win64": ["WINNT_x86_64-msvc", "WINNT_x86_64-msvc-x64"],
+    "win64-asan-reporter": ["WINNT_x86_64-msvc-x64-asan"],
+    "win64-aarch64": [
+        "WINNT_aarch64-msvc-aarch64",
+    ],
+}
+
+FTP_PLATFORM_MAP = {
+    "Darwin_x86-gcc3": "mac",
+    "Darwin_x86-gcc3-u-i386-x86_64": "mac",
+    "Darwin_x86_64-gcc3": "mac",
+    "Darwin_x86_64-gcc3-u-i386-x86_64": "mac",
+    "Darwin_aarch64-gcc3": "mac",
+    "Linux_x86-gcc3": "linux-i686",
+    "Linux_x86_64-gcc3": "linux-x86_64",
+    "Linux_x86_64-gcc3-asan": "linux-x86_64-asan-reporter",
+    "WINNT_x86_64-msvc-x64-asan": "win64-asan-reporter",
+    "WINNT_x86-msvc": "win32",
+    "WINNT_x86-msvc-x64": "win32",
+    "WINNT_x86-msvc-x86": "win32",
+    "WINNT_x86_64-msvc": "win64",
+    "WINNT_x86_64-msvc-x64": "win64",
+    "WINNT_aarch64-msvc-aarch64": "win64-aarch64",
+}
+
+
+def get_balrog_platform_name(platform):
+    """Convert build platform names into balrog platform names.
+
+    Remove known values instead to catch aarch64 and other platforms
+    that may be added.
+    """
+    removals = ["-devedition", "-shippable"]
+    for remove in removals:
+        platform = platform.replace(remove, "")
+    return PLATFORM_RENAMES.get(platform, platform)
+
+
+def _sanitize_platform(platform):
+    platform = get_balrog_platform_name(platform)
+    if platform not in BALROG_PLATFORM_MAP:
+        return platform
+    return BALROG_PLATFORM_MAP[platform][0]
+
+
+def get_builds(release_history, platform, locale):
+    """Examine cached balrog release history and return the list of
+    builds we need to generate diffs from"""
+    platform = _sanitize_platform(platform)
+    return release_history.get(platform, {}).get(locale, {})
+
+
+def get_partials_artifacts_from_params(release_history, platform, locale):
+    platform = _sanitize_platform(platform)
+    return [
+        (artifact, details.get("previousVersion", None))
+        for artifact, details in release_history.get(platform, {})
+        .get(locale, {})
+        .items()
+    ]
+
+
+def get_partials_info_from_params(release_history, platform, locale):
+    platform = _sanitize_platform(platform)
+
+    artifact_map = {}
+    for k in release_history.get(platform, {}).get(locale, {}):
+        details = release_history[platform][locale][k]
+        attributes = ("buildid", "previousBuildNumber", "previousVersion")
+        artifact_map[k] = {
+            attr: details[attr] for attr in attributes if attr in details
+        }
+    return artifact_map
+
+
+def _retry_on_http_errors(url, verify, params, errors):
+    if params:
+        params_str = "&".join("=".join([k, str(v)]) for k, v in params.items())
+    else:
+        params_str = ""
+    logger.info("Connecting to %s?%s", url, params_str)
+    for _ in redo.retrier(sleeptime=5, max_sleeptime=30, attempts=10):
+        try:
+            req = requests.get(url, verify=verify, params=params, timeout=10)
+            req.raise_for_status()
+            return req
+        except requests.HTTPError as e:
+            if e.response.status_code in errors:
+                logger.exception(
+                    "Got HTTP %s trying to reach %s", e.response.status_code, url
+                )
+            else:
+                raise
+    else:
+        raise Exception(f"Cannot connect to {url}!")
+
+
+def get_sorted_releases(product, branch):
+    """Returns a list of release names from Balrog.
+    :param product: product name, AKA appName
+    :param branch: branch name, e.g. mozilla-central
+    :return: a sorted list of release names, most recent first.
+    """
+    url = f"{_get_balrog_api_root(branch)}/releases"
+    params = {
+        "product": product,
+        # Adding -nightly-2 (2 stands for the beginning of build ID
+        # based on date) should filter out release and latest blobs.
+        # This should be changed to -nightly-3 in 3000 ;)
+        "name_prefix": f"{product}-{branch}-nightly-2",
+        "names_only": True,
+    }
+    req = _retry_on_http_errors(url=url, verify=True, params=params, errors=[500])
+    releases = req.json()["names"]
+    releases = sorted(releases, reverse=True)
+    return releases
+
+
+def get_release_builds(release, branch):
+    url = f"{_get_balrog_api_root(branch)}/releases/{release}"
+    req = _retry_on_http_errors(url=url, verify=True, params=None, errors=[500])
+    return req.json()
+
+
+def _get_balrog_api_root(branch):
+    # Query into the scopes scriptworker uses to make sure we check against the same balrog server
+    # That our jobs would use.
+    scope = None
+    for alias, projects in BALROG_SCOPE_ALIAS_TO_PROJECT:
+        if branch in projects and alias in BALROG_SERVER_SCOPES:
+            scope = BALROG_SERVER_SCOPES[alias]
+            break
+    else:
+        scope = BALROG_SERVER_SCOPES["default"]
+
+    if scope == "balrog:server:dep":
+        return "https://stage.balrog.nonprod.cloudops.mozgcp.net/api/v1"
+    return "https://aus5.mozilla.org/api/v1"
+
+
+def find_localtest(fileUrls):
+    for channel in fileUrls:
+        if "-localtest" in channel:
+            return channel
+
+
+def populate_release_history(
+    product, branch, maxbuilds=4, maxsearch=10, partial_updates=None
+):
+    # Assuming we are using release branches when we know the list of previous
+    # releases in advance
+    if partial_updates is not None:
+        return _populate_release_history(
+            product, branch, partial_updates=partial_updates
+        )
+    return _populate_nightly_history(
+        product, branch, maxbuilds=maxbuilds, maxsearch=maxsearch
+    )
+
+
+def _populate_nightly_history(product, branch, maxbuilds=4, maxsearch=10):
+    """Find relevant releases in Balrog
+    Not all releases have all platforms and locales, due
+    to Taskcluster migration.
+
+        Args:
+            product (str): capitalized product name, AKA appName, e.g. Firefox
+            branch (str): branch name (mozilla-central)
+            maxbuilds (int): Maximum number of historical releases to populate
+            maxsearch(int): Traverse at most this many releases, to avoid
+                working through the entire history.
+        Returns:
+            json object based on data from balrog api
+
+            results = {
+                'platform1': {
+                    'locale1': {
+                        'buildid1': mar_url,
+                        'buildid2': mar_url,
+                        'buildid3': mar_url,
+                    },
+                    'locale2': {
+                        'target.partial-1.mar': {'buildid1': 'mar_url'},
+                    }
+                },
+                'platform2': {
+                }
+            }
+    """
+    last_releases = get_sorted_releases(product, branch)
+
+    partial_mar_tmpl = "target.partial-{}.mar"
+
+    builds = dict()
+    for release in last_releases[:maxsearch]:
+        # maxbuilds in all categories, don't make any more queries
+        full = len(builds) > 0 and all(
+            len(builds[platform][locale]) >= maxbuilds
+            for platform in builds
+            for locale in builds[platform]
+        )
+        if full:
+            break
+        history = get_release_builds(release, branch)
+
+        for platform in history["platforms"]:
+            if "alias" in history["platforms"][platform]:
+                continue
+            if platform not in builds:
+                builds[platform] = dict()
+            for locale in history["platforms"][platform]["locales"]:
+                if locale not in builds[platform]:
+                    builds[platform][locale] = dict()
+                if len(builds[platform][locale]) >= maxbuilds:
+                    continue
+                buildid = history["platforms"][platform]["locales"][locale]["buildID"]
+                url = history["platforms"][platform]["locales"][locale]["completes"][0][
+                    "fileUrl"
+                ]
+                nextkey = len(builds[platform][locale]) + 1
+                builds[platform][locale][partial_mar_tmpl.format(nextkey)] = {
+                    "buildid": buildid,
+                    "mar_url": url,
+                }
+    return builds
+
+
+def _populate_release_history(product, branch, partial_updates):
+    builds = dict()
+    for version, release in partial_updates.items():
+        prev_release_blob = "{product}-{version}-build{build_number}".format(
+            product=product, version=version, build_number=release["buildNumber"]
+        )
+        partial_mar_key = f"target-{version}.partial.mar"
+        history = get_release_builds(prev_release_blob, branch)
+        # use one of the localtest channels to avoid relying on bouncer
+        localtest = find_localtest(history["fileUrls"])
+        url_pattern = history["fileUrls"][localtest]["completes"]["*"]
+
+        for platform in history["platforms"]:
+            if "alias" in history["platforms"][platform]:
+                continue
+            if platform not in builds:
+                builds[platform] = dict()
+            for locale in history["platforms"][platform]["locales"]:
+                if locale not in builds[platform]:
+                    builds[platform][locale] = dict()
+                buildid = history["platforms"][platform]["locales"][locale]["buildID"]
+                url = url_pattern.replace(
+                    "%OS_FTP%", FTP_PLATFORM_MAP[platform]
+                ).replace("%LOCALE%", locale)
+                builds[platform][locale][partial_mar_key] = {
+                    "buildid": buildid,
+                    "mar_url": url,
+                    "previousVersion": version,
+                    "previousBuildNumber": release["buildNumber"],
+                    "product": product,
+                }
+    return builds
diff --git a/taskcluster/gecko_taskgraph/util/partners.py b/taskcluster/gecko_taskgraph/util/partners.py
new file mode 100644
index 0000000000..2546e1ae88
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/util/partners.py
@@ -0,0 +1,555 @@
+# 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 xml.etree.ElementTree as ET
+from urllib.parse import urlencode
+
+import requests
+import yaml
+from redo import retry
+from taskgraph.util.schema import resolve_keyed_by
+
+from gecko_taskgraph.util.attributes import release_level
+from gecko_taskgraph.util.copy_task import copy_task
+
+# Suppress chatty requests logging
+logging.getLogger("requests").setLevel(logging.WARNING)
+
+log = logging.getLogger(__name__)
+
+GITHUB_API_ENDPOINT = "https://api.github.com/graphql"
+
+"""
+LOGIN_QUERY, MANIFEST_QUERY, and REPACK_CFG_QUERY are all written to the Github v4 API,
+which users GraphQL. See https://developer.github.com/v4/
+"""
+
+LOGIN_QUERY = """query {
+  viewer {
+    login
+    name
+  }
+}
+"""
+
+# Returns the contents of default.xml from a manifest repository
+MANIFEST_QUERY = """query {
+  repository(owner:"%(owner)s", name:"%(repo)s") {
+    object(expression: "master:%(file)s") {
+      ... on Blob {
+        text
+      }
+    }
+  }
+}
+"""
+# Example response:
+# {
+#   "data": {
+#     "repository": {
+#       "object": {
+#         "text": "<?xml version=\"1.0\" ?>\n<manifest>\n  " +
+#           "<remote fetch=\"git@github.com:mozilla-partners/\" name=\"mozilla-partners\"/>\n  " +
+#           "<remote fetch=\"git@github.com:mozilla/\" name=\"mozilla\"/>\n\n  " +
+#           "<project name=\"repack-scripts\" path=\"scripts\" remote=\"mozilla-partners\" " +
+#           "revision=\"master\"/>\n  <project name=\"build-tools\" path=\"scripts/tools\" " +
+#           "remote=\"mozilla\" revision=\"master\"/>\n  <project name=\"mozilla-EME-free\" " +
+#           "path=\"partners/mozilla-EME-free\" remote=\"mozilla-partners\" " +
+#           "revision=\"master\"/>\n</manifest>\n"
+#       }
+#     }
+#   }
+# }
+
+# Returns the contents of desktop/*/repack.cfg for a partner repository
+REPACK_CFG_QUERY = """query{
+  repository(owner:"%(owner)s", name:"%(repo)s") {
+    object(expression: "%(revision)s:desktop/"){
+      ... on Tree {
+        entries {
+          name
+          object {
+            ... on Tree {
+              entries {
+                name
+                object {
+                  ... on Blob {
+                    text
+                  }
+                }
+              }
+            }
+          }
+        }
+      }
+    }
+  }
+}
+"""
+# Example response:
+# {
+#   "data": {
+#     "repository": {
+#       "object": {
+#         "entries": [
+#           {
+#             "name": "mozilla-EME-free",
+#             "object": {
+#               "entries": [
+#                 {
+#                   "name": "distribution",
+#                   "object": {}
+#                 },
+#                 {
+#                   "name": "repack.cfg",
+#                   "object": {
+#                     "text": "aus=\"mozilla-EMEfree\"\ndist_id=\"mozilla-EMEfree\"\n" +
+#                             "dist_version=\"1.0\"\nlinux-i686=true\nlinux-x86_64=true\n" +
+#                             " locales=\"ach af de en-US\"\nmac=true\nwin32=true\nwin64=true\n" +
+#                             "output_dir=\"%(platform)s-EME-free/%(locale)s\"\n\n" +
+#                             "# Upload params\nbucket=\"net-mozaws-prod-delivery-firefox\"\n" +
+#                             "upload_to_candidates=true\n"
+#                   }
+#                 }
+#               ]
+#             }
+#           }
+#         ]
+#       }
+#     }
+#   }
+# }
+
+# Map platforms in repack.cfg into their equivalents in taskcluster
+TC_PLATFORM_PER_FTP = {
+    "linux-i686": "linux-shippable",
+    "linux-x86_64": "linux64-shippable",
+    "mac": "macosx64-shippable",
+    "win32": "win32-shippable",
+    "win64": "win64-shippable",
+    "win64-aarch64": "win64-aarch64-shippable",
+}
+
+TASKCLUSTER_PROXY_SECRET_ROOT = "http://taskcluster/secrets/v1/secret"
+
+LOCALES_FILE = os.path.join(
+    os.path.dirname(os.path.dirname(os.path.dirname(os.path.dirname(__file__)))),
+    "browser",
+    "locales",
+    "l10n-changesets.json",
+)
+
+# cache data at the module level
+partner_configs = {}
+
+
+def get_token(params):
+    """We use a Personal Access Token from Github to lookup partner config. No extra scopes are
+    needed on the token to read public repositories, but need the 'repo' scope to see private
+    repositories. This is not fine grained and also grants r/w access, but is revoked at the repo
+    level.
+    """
+
+    # Allow for local taskgraph debugging
+    if os.environ.get("GITHUB_API_TOKEN"):
+        return os.environ["GITHUB_API_TOKEN"]
+
+    # The 'usual' method - via taskClusterProxy for decision tasks
+    url = "{secret_root}/project/releng/gecko/build/level-{level}/partner-github-api".format(
+        secret_root=TASKCLUSTER_PROXY_SECRET_ROOT, **params
+    )
+    try:
+        resp = retry(
+            requests.get,
+            attempts=2,
+            sleeptime=10,
+            args=(url,),
+            kwargs={"timeout": 60, "headers": ""},
+        )
+        j = resp.json()
+        return j["secret"]["key"]
+    except (requests.ConnectionError, ValueError, KeyError):
+        raise RuntimeError("Could not get Github API token to lookup partner data")
+
+
+def query_api(query, token):
+    """Make a query with a Github auth header, returning the json"""
+    headers = {"Authorization": "bearer %s" % token}
+    r = requests.post(GITHUB_API_ENDPOINT, json={"query": query}, headers=headers)
+    r.raise_for_status()
+
+    j = r.json()
+    if "errors" in j:
+        raise RuntimeError("Github query error - %s", j["errors"])
+    return j
+
+
+def check_login(token):
+    log.debug("Checking we have a valid login")
+    query_api(LOGIN_QUERY, token)
+
+
+def get_repo_params(repo):
+    """Parse the organisation and repo name from an https or git url for a repo"""
+    if repo.startswith("https"):
+        # eg https://github.com/mozilla-partners/mozilla-EME-free
+        return repo.rsplit("/", 2)[-2:]
+    if repo.startswith("git@"):
+        # eg git@github.com:mozilla-partners/mailru.git
+        repo = repo.replace(".git", "")
+        return repo.split(":")[-1].split("/")
+
+
+def get_partners(manifestRepo, token):
+    """Given the url to a manifest repository, retrieve the default.xml and parse it into a
+    list of partner repos.
+    """
+    log.debug("Querying for manifest default.xml in %s", manifestRepo)
+    owner, repo = get_repo_params(manifestRepo)
+    query = MANIFEST_QUERY % {"owner": owner, "repo": repo, "file": "default.xml"}
+    raw_manifest = query_api(query, token)
+    log.debug("Raw manifest: %s", raw_manifest)
+    if not raw_manifest["data"]["repository"]:
+        raise RuntimeError(
+            "Couldn't load partner manifest at %s, insufficient permissions ?"
+            % manifestRepo
+        )
+    e = ET.fromstring(raw_manifest["data"]["repository"]["object"]["text"])
+
+    remotes = {}
+    partners = {}
+    for child in e:
+        if child.tag == "remote":
+            name = child.attrib["name"]
+            url = child.attrib["fetch"]
+            remotes[name] = url
+            log.debug("Added remote %s at %s", name, url)
+        elif child.tag == "project":
+            # we don't need to check any code repos
+            if "scripts" in child.attrib["path"]:
+                continue
+            owner, _ = get_repo_params(remotes[child.attrib["remote"]] + "_")
+            partner_url = {
+                "owner": owner,
+                "repo": child.attrib["name"],
+                "revision": child.attrib["revision"],
+            }
+            partners[child.attrib["name"]] = partner_url
+            log.debug(
+                "Added partner %s at revision %s"
+                % (partner_url["repo"], partner_url["revision"])
+            )
+    return partners
+
+
+def parse_config(data):
+    """Parse a single repack.cfg file into a python dictionary.
+    data is contents of the file, in "foo=bar\nbaz=buzz" style. We do some translation on
+    locales and platforms data, otherwise passthrough
+    """
+    ALLOWED_KEYS = (
+        "locales",
+        "platforms",
+        "upload_to_candidates",
+        "repack_stub_installer",
+        "publish_to_releases",
+    )
+    config = {"platforms": []}
+    for l in data.splitlines():
+        if "=" in l:
+            l = str(l)
+            key, value = l.split("=", 1)
+            value = value.strip("'\"").rstrip("'\"")
+            if key in TC_PLATFORM_PER_FTP.keys():
+                if value.lower() == "true":
+                    config["platforms"].append(TC_PLATFORM_PER_FTP[key])
+                continue
+            if key not in ALLOWED_KEYS:
+                continue
+            if key == "locales":
+                # a list please
+                value = value.split(" ")
+            config[key] = value
+    return config
+
+
+def get_repack_configs(repackRepo, token):
+    """For a partner repository, retrieve all the repack.cfg files and parse them into a dict"""
+    log.debug("Querying for configs in %s", repackRepo)
+    query = REPACK_CFG_QUERY % repackRepo
+    raw_configs = query_api(query, token)
+    raw_configs = raw_configs["data"]["repository"]["object"]["entries"]
+
+    configs = {}
+    for sub_config in raw_configs:
+        name = sub_config["name"]
+        for file in sub_config["object"].get("entries", []):
+            if file["name"] != "repack.cfg":
+                continue
+            configs[name] = parse_config(file["object"]["text"])
+    return configs
+
+
+def get_attribution_config(manifestRepo, token):
+    log.debug("Querying for manifest attribution_config.yml in %s", manifestRepo)
+    owner, repo = get_repo_params(manifestRepo)
+    query = MANIFEST_QUERY % {
+        "owner": owner,
+        "repo": repo,
+        "file": "attribution_config.yml",
+    }
+    raw_manifest = query_api(query, token)
+    if not raw_manifest["data"]["repository"]:
+        raise RuntimeError(
+            "Couldn't load partner manifest at %s, insufficient permissions ?"
+            % manifestRepo
+        )
+    # no file has been set up, gracefully continue
+    if raw_manifest["data"]["repository"]["object"] is None:
+        log.debug("No attribution_config.yml file found")
+        return {}
+
+    return yaml.safe_load(raw_manifest["data"]["repository"]["object"]["text"])
+
+
+def get_partner_config_by_url(manifest_url, kind, token, partner_subset=None):
+    """Retrieve partner data starting from the manifest url, which points to a repository
+    containing a default.xml that is intended to be drive the Google tool 'repo'. It
+    descends into each partner repo to lookup and parse the repack.cfg file(s).
+
+    If partner_subset is a list of sub_config names only return data for those.
+
+    Supports caching data by kind to avoid repeated requests, relying on the related kinds for
+    partner repacking, signing, repackage, repackage signing all having the same kind prefix.
+    """
+    if not manifest_url:
+        raise RuntimeError(f"Manifest url for {kind} not defined")
+    if kind not in partner_configs:
+        log.info("Looking up data for %s from %s", kind, manifest_url)
+        check_login(token)
+        if kind == "release-partner-attribution":
+            partner_configs[kind] = get_attribution_config(manifest_url, token)
+        else:
+            partners = get_partners(manifest_url, token)
+
+            partner_configs[kind] = {}
+            for partner, partner_url in partners.items():
+                if partner_subset and partner not in partner_subset:
+                    continue
+                partner_configs[kind][partner] = get_repack_configs(partner_url, token)
+
+    return partner_configs[kind]
+
+
+def check_if_partners_enabled(config, tasks):
+    if (
+        (
+            config.params["release_enable_partner_repack"]
+            and config.kind.startswith("release-partner-repack")
+        )
+        or (
+            config.params["release_enable_partner_attribution"]
+            and config.kind.startswith("release-partner-attribution")
+        )
+        or (
+            config.params["release_enable_emefree"]
+            and config.kind.startswith("release-eme-free-")
+        )
+    ):
+        yield from tasks
+
+
+def get_partner_config_by_kind(config, kind):
+    """Retrieve partner data starting from the manifest url, which points to a repository
+    containing a default.xml that is intended to be drive the Google tool 'repo'. It
+    descends into each partner repo to lookup and parse the repack.cfg file(s).
+
+    Supports caching data by kind to avoid repeated requests, relying on the related kinds for
+    partner repacking, signing, repackage, repackage signing all having the same kind prefix.
+    """
+    partner_subset = config.params["release_partners"]
+    partner_configs = config.params["release_partner_config"] or {}
+
+    # TODO eme-free should be a partner; we shouldn't care about per-kind
+    for k in partner_configs:
+        if kind.startswith(k):
+            kind_config = partner_configs[k]
+            break
+    else:
+        return {}
+    # if we're only interested in a subset of partners we remove the rest
+    if partner_subset:
+        if kind.startswith("release-partner-repack"):
+            # TODO - should be fatal to have an unknown partner in partner_subset
+            for partner in [p for p in kind_config.keys() if p not in partner_subset]:
+                del kind_config[partner]
+        elif kind.startswith("release-partner-attribution") and isinstance(
+            kind_config, dict
+        ):
+            all_configs = copy_task(kind_config.get("configs", []))
+            kind_config["configs"] = []
+            for this_config in all_configs:
+                if this_config["campaign"] in partner_subset:
+                    kind_config["configs"].append(this_config)
+    return kind_config
+
+
+def _fix_subpartner_locales(orig_config, all_locales):
+    subpartner_config = copy_task(orig_config)
+    # Get an ordered list of subpartner locales that is a subset of all_locales
+    subpartner_config["locales"] = sorted(
+        list(set(orig_config["locales"]) & set(all_locales))
+    )
+    return subpartner_config
+
+
+def fix_partner_config(orig_config):
+    pc = {}
+    with open(LOCALES_FILE) as fh:
+        all_locales = list(json.load(fh).keys())
+    # l10n-changesets.json doesn't include en-US, but the repack list does
+    if "en-US" not in all_locales:
+        all_locales.append("en-US")
+    for kind, kind_config in orig_config.items():
+        if kind == "release-partner-attribution":
+            pc[kind] = {}
+            if kind_config:
+                pc[kind] = {"defaults": kind_config["defaults"]}
+                for config in kind_config["configs"]:
+                    # Make sure our locale list is a subset of all_locales
+                    pc[kind].setdefault("configs", []).append(
+                        _fix_subpartner_locales(config, all_locales)
+                    )
+        else:
+            for partner, partner_config in kind_config.items():
+                for subpartner, subpartner_config in partner_config.items():
+                    # get rid of empty subpartner configs
+                    if not subpartner_config:
+                        continue
+                    # Make sure our locale list is a subset of all_locales
+                    pc.setdefault(kind, {}).setdefault(partner, {})[
+                        subpartner
+                    ] = _fix_subpartner_locales(subpartner_config, all_locales)
+    return pc
+
+
+# seems likely this exists elsewhere already
+def get_ftp_platform(platform):
+    if platform.startswith("win32"):
+        return "win32"
+    if platform.startswith("win64-aarch64"):
+        return "win64-aarch64"
+    if platform.startswith("win64"):
+        return "win64"
+    if platform.startswith("macosx"):
+        return "mac"
+    if platform.startswith("linux-"):
+        return "linux-i686"
+    if platform.startswith("linux64"):
+        return "linux-x86_64"
+    raise ValueError(f"Unimplemented platform {platform}")
+
+
+# Ugh
+def locales_per_build_platform(build_platform, locales):
+    if build_platform.startswith("mac"):
+        exclude = ["ja"]
+    else:
+        exclude = ["ja-JP-mac"]
+    return [locale for locale in locales if locale not in exclude]
+
+
+def get_partner_url_config(parameters, graph_config):
+    partner_url_config = copy_task(graph_config["partner-urls"])
+    substitutions = {
+        "release-product": parameters["release_product"],
+        "release-level": release_level(parameters["project"]),
+        "release-type": parameters["release_type"],
+    }
+    resolve_keyed_by(
+        partner_url_config,
+        "release-eme-free-repack",
+        "eme-free manifest_url",
+        **substitutions,
+    )
+    resolve_keyed_by(
+        partner_url_config,
+        "release-partner-repack",
+        "partner manifest url",
+        **substitutions,
+    )
+    resolve_keyed_by(
+        partner_url_config,
+        "release-partner-attribution",
+        "partner attribution url",
+        **substitutions,
+    )
+    return partner_url_config
+
+
+def get_repack_ids_by_platform(config, build_platform):
+    partner_config = get_partner_config_by_kind(config, config.kind)
+    combinations = []
+    for partner, subconfigs in partner_config.items():
+        for sub_config_name, sub_config in subconfigs.items():
+            if build_platform not in sub_config.get("platforms", []):
+                continue
+            locales = locales_per_build_platform(
+                build_platform, sub_config.get("locales", [])
+            )
+            for locale in locales:
+                combinations.append(f"{partner}/{sub_config_name}/{locale}")
+    return sorted(combinations)
+
+
+def get_partners_to_be_published(config):
+    # hardcoded kind because release-bouncer-aliases doesn't match otherwise
+    partner_config = get_partner_config_by_kind(config, "release-partner-repack")
+    partners = []
+    for partner, subconfigs in partner_config.items():
+        for sub_config_name, sub_config in subconfigs.items():
+            if sub_config.get("publish_to_releases"):
+                partners.append((partner, sub_config_name, sub_config["platforms"]))
+    return partners
+
+
+def apply_partner_priority(config, jobs):
+    priority = None
+    # Reduce the priority of the partner repack jobs because they don't block QE. Meanwhile
+    # leave EME-free jobs alone because they do, and they'll get the branch priority like the rest
+    # of the release. Only bother with this in production, not on staging releases on try.
+    # medium is the same as mozilla-central, see taskcluster/ci/config.yml. ie higher than
+    # integration branches because we don't want to wait a lot for the graph to be done, but
+    # for multiple releases the partner tasks always wait for non-partner.
+    if (
+        config.kind.startswith(
+            ("release-partner-repack", "release-partner-attribution")
+        )
+        and release_level(config.params["project"]) == "production"
+    ):
+        priority = "medium"
+    for job in jobs:
+        if priority:
+            job["priority"] = priority
+        yield job
+
+
+def generate_attribution_code(defaults, partner):
+    params = {
+        "medium": defaults["medium"],
+        "source": defaults["source"],
+        "campaign": partner["campaign"],
+        "content": partner["content"],
+    }
+    if partner.get("variation"):
+        params["variation"] = partner["variation"]
+    if partner.get("experiment"):
+        params["experiment"] = partner["experiment"]
+
+    code = urlencode(params)
+    return code
diff --git a/taskcluster/gecko_taskgraph/util/perfile.py b/taskcluster/gecko_taskgraph/util/perfile.py
new file mode 100644
index 0000000000..4e82d87dad
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/util/perfile.py
@@ -0,0 +1,104 @@
+# 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 itertools
+import json
+import logging
+import math
+
+import taskgraph
+from mozbuild.util import memoize
+from mozpack.path import match as mozpackmatch
+
+from gecko_taskgraph import files_changed
+
+from .. import GECKO
+
+logger = logging.getLogger(__name__)
+
+
+@memoize
+def perfile_number_of_chunks(is_try, try_task_config, head_repository, head_rev, type):
+    if taskgraph.fast and not is_try:
+        # When iterating on taskgraph changes, the exact number of chunks that
+        # test-verify runs usually isn't important, so skip it when going fast.
+        return 3
+    tests_per_chunk = 10.0
+    if type.startswith("test-coverage"):
+        tests_per_chunk = 30.0
+
+    if type.startswith("test-verify-wpt") or type.startswith("test-coverage-wpt"):
+        file_patterns = [
+            "testing/web-platform/tests/**",
+            "testing/web-platform/mozilla/tests/**",
+        ]
+    elif type.startswith("test-verify-gpu") or type.startswith("test-coverage-gpu"):
+        file_patterns = [
+            "**/*webgl*/**/test_*",
+            "**/dom/canvas/**/test_*",
+            "**/gfx/tests/**/test_*",
+            "**/devtools/canvasdebugger/**/browser_*",
+            "**/reftest*/**",
+        ]
+    elif type.startswith("test-verify") or type.startswith("test-coverage"):
+        file_patterns = [
+            "**/test_*",
+            "**/browser_*",
+            "**/crashtest*/**",
+            "js/src/tests/test/**",
+            "js/src/tests/non262/**",
+            "js/src/tests/test262/**",
+        ]
+    else:
+        # Returning 0 means no tests to run, this captures non test-verify tasks
+        return 1
+
+    changed_files = set()
+    if try_task_config:
+        suite_to_paths = json.loads(try_task_config)
+        specified_files = itertools.chain.from_iterable(suite_to_paths.values())
+        changed_files.update(specified_files)
+
+    if is_try:
+        changed_files.update(files_changed.get_locally_changed_files(GECKO))
+    else:
+        changed_files.update(files_changed.get_changed_files(head_repository, head_rev))
+
+    test_count = 0
+    for pattern in file_patterns:
+        for path in changed_files:
+            # TODO: consider running tests if a manifest changes
+            if path.endswith(".list") or path.endswith(".ini"):
+                continue
+            if path.endswith("^headers^"):
+                continue
+
+            if mozpackmatch(path, pattern):
+                gpu = False
+                if type == "test-verify-e10s" or type == "test-coverage-e10s":
+                    # file_patterns for test-verify will pick up some gpu tests, lets ignore
+                    # in the case of reftest, we will not have any in the regular case
+                    gpu_dirs = [
+                        "dom/canvas",
+                        "gfx/tests",
+                        "devtools/canvasdebugger",
+                        "webgl",
+                    ]
+                    for gdir in gpu_dirs:
+                        if len(path.split(gdir)) > 1:
+                            gpu = True
+
+                if not gpu:
+                    test_count += 1
+
+    chunks = test_count / tests_per_chunk
+    chunks = int(math.ceil(chunks))
+
+    # Never return 0 chunks on try, so that per-file tests can be pushed to try with
+    # an explicit path, and also so "empty" runs can be checked on try.
+    if is_try and chunks == 0:
+        chunks = 1
+
+    return chunks
diff --git a/taskcluster/gecko_taskgraph/util/platforms.py b/taskcluster/gecko_taskgraph/util/platforms.py
new file mode 100644
index 0000000000..2c423223fe
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/util/platforms.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/.
+
+
+import re
+
+from taskgraph.util.attributes import keymatch
+
+# platform family is extracted from build platform by taking the alphabetic prefix
+# and then translating win -> windows
+_platform_re = re.compile(r"^[a-z]*")
+_renames = {"win": "windows"}
+
+
+_archive_formats = {
+    "linux": ".tar.bz2",
+    "macosx": ".tar.gz",
+    "windows": ".zip",
+}
+
+_executable_extension = {
+    "linux": "",
+    "macosx": "",
+    "windows": ".exe",
+}
+
+_architectures = {
+    r"linux\b.*": "x86",
+    r"linux64\b.*": "x86_64",
+    r"macosx64\b.*": "macos-x86_64-aarch64",
+    r"win32\b.*": "x86",
+    r"win64\b(?!-aarch64).*": "x86_64",
+    r"win64-aarch64\b.*": "aarch64",
+}
+
+
+def platform_family(build_platform):
+    """Given a build platform, return the platform family (linux, macosx, etc.)"""
+    family = _platform_re.match(build_platform).group(0)
+    return _renames.get(family, family)
+
+
+def archive_format(build_platform):
+    """Given a build platform, return the archive format used on the platform."""
+    return _archive_formats[platform_family(build_platform)]
+
+
+def executable_extension(build_platform):
+    """Given a build platform, return the executable extension used on the platform."""
+    return _executable_extension[platform_family(build_platform)]
+
+
+def architecture(build_platform):
+    matches = keymatch(_architectures, build_platform)
+    if len(matches) == 1:
+        return matches[0]
+    raise Exception(f"Could not determine architecture of platform `{build_platform}`.")
diff --git a/taskcluster/gecko_taskgraph/util/scriptworker.py b/taskcluster/gecko_taskgraph/util/scriptworker.py
new file mode 100644
index 0000000000..3f1f64d9f8
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/util/scriptworker.py
@@ -0,0 +1,859 @@
+# 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/.
+"""Make scriptworker.cot.verify more user friendly by making scopes dynamic.
+
+Scriptworker uses certain scopes to determine which sets of credentials to use.
+Certain scopes are restricted by branch in chain of trust verification, and are
+checked again at the script level.  This file provides functions to adjust
+these scopes automatically by project; this makes pushing to try, forking a
+project branch, and merge day uplifts more user friendly.
+
+In the future, we may adjust scopes by other settings as well, e.g. different
+scopes for `push-to-candidates` rather than `push-to-releases`, even if both
+happen on mozilla-beta and mozilla-release.
+
+Additional configuration is found in the :ref:`graph config <taskgraph-graph-config>`.
+"""
+import functools
+import itertools
+import json
+import os
+from datetime import datetime
+
+import jsone
+from mozbuild.util import memoize
+from taskgraph.util.schema import resolve_keyed_by
+from taskgraph.util.taskcluster import get_artifact_prefix
+from taskgraph.util.yaml import load_yaml
+
+from gecko_taskgraph.util.copy_task import copy_task
+
+# constants {{{1
+"""Map signing scope aliases to sets of projects.
+
+Currently m-c and DevEdition on m-b use nightly signing; Beta on m-b and m-r
+use release signing. These data structures aren't set-up to handle different
+scopes on the same repo, so we use a different set of them for DevEdition, and
+callers are responsible for using the correct one (by calling the appropriate
+helper below). More context on this in https://bugzilla.mozilla.org/show_bug.cgi?id=1358601.
+
+We will need to add esr support at some point. Eventually we want to add
+nuance so certain m-b and m-r tasks use dep or nightly signing, and we only
+release sign when we have a signed-off set of candidate builds.  This current
+approach works for now, though.
+
+This is a list of list-pairs, for ordering.
+"""
+SIGNING_SCOPE_ALIAS_TO_PROJECT = [
+    [
+        "all-nightly-branches",
+        {
+            "mozilla-central",
+            "comm-central",
+        },
+    ],
+    [
+        "all-release-branches",
+        {
+            "mozilla-beta",
+            "mozilla-release",
+            "mozilla-esr102",
+            "mozilla-esr115",
+            "comm-beta",
+            "comm-esr102",
+            "comm-esr115",
+        },
+    ],
+]
+
+"""Map the signing scope aliases to the actual scopes.
+"""
+SIGNING_CERT_SCOPES = {
+    "all-release-branches": "signing:cert:release-signing",
+    "all-nightly-branches": "signing:cert:nightly-signing",
+    "default": "signing:cert:dep-signing",
+}
+
+DEVEDITION_SIGNING_SCOPE_ALIAS_TO_PROJECT = [
+    [
+        "beta",
+        {
+            "mozilla-beta",
+        },
+    ]
+]
+
+DEVEDITION_SIGNING_CERT_SCOPES = {
+    "beta": "signing:cert:nightly-signing",
+    "default": "signing:cert:dep-signing",
+}
+
+"""Map beetmover scope aliases to sets of projects.
+"""
+BEETMOVER_SCOPE_ALIAS_TO_PROJECT = [
+    [
+        "all-nightly-branches",
+        {
+            "mozilla-central",
+            "comm-central",
+            "oak",
+        },
+    ],
+    [
+        "all-release-branches",
+        {
+            "mozilla-beta",
+            "mozilla-release",
+            "mozilla-esr102",
+            "mozilla-esr115",
+            "comm-beta",
+            "comm-esr102",
+            "comm-esr115",
+        },
+    ],
+]
+
+"""Map the beetmover scope aliases to the actual scopes.
+"""
+BEETMOVER_BUCKET_SCOPES = {
+    "all-release-branches": "beetmover:bucket:release",
+    "all-nightly-branches": "beetmover:bucket:nightly",
+    "default": "beetmover:bucket:dep",
+}
+
+"""Map the beetmover scope aliases to the actual scopes.
+These are the scopes needed to import artifacts into the product delivery APT repos.
+"""
+BEETMOVER_APT_REPO_SCOPES = {
+    "all-release-branches": "beetmover:apt-repo:release",
+    "all-nightly-branches": "beetmover:apt-repo:nightly",
+    "default": "beetmover:apt-repo:dep",
+}
+
+"""Map the beetmover tasks aliases to the actual action scopes.
+"""
+BEETMOVER_ACTION_SCOPES = {
+    "nightly": "beetmover:action:push-to-nightly",
+    "nightly-oak": "beetmover:action:push-to-nightly",
+    "default": "beetmover:action:push-to-candidates",
+}
+
+"""Map the beetmover tasks aliases to the actual action scopes.
+The action scopes are generic across different repo types.
+"""
+BEETMOVER_REPO_ACTION_SCOPES = {
+    "default": "beetmover:action:import-from-gcs-to-artifact-registry",
+}
+
+"""Known balrog actions."""
+BALROG_ACTIONS = (
+    "submit-locale",
+    "submit-toplevel",
+    "schedule",
+    "v2-submit-locale",
+    "v2-submit-toplevel",
+)
+
+"""Map balrog scope aliases to sets of projects.
+
+This is a list of list-pairs, for ordering.
+"""
+BALROG_SCOPE_ALIAS_TO_PROJECT = [
+    [
+        "nightly",
+        {
+            "mozilla-central",
+            "comm-central",
+            "oak",
+        },
+    ],
+    [
+        "beta",
+        {
+            "mozilla-beta",
+            "comm-beta",
+        },
+    ],
+    [
+        "release",
+        {
+            "mozilla-release",
+            "comm-esr102",
+            "comm-esr115",
+        },
+    ],
+    [
+        "esr102",
+        {
+            "mozilla-esr102",
+        },
+    ],
+    [
+        "esr115",
+        {
+            "mozilla-esr115",
+        },
+    ],
+]
+
+"""Map the balrog scope aliases to the actual scopes.
+"""
+BALROG_SERVER_SCOPES = {
+    "nightly": "balrog:server:nightly",
+    "aurora": "balrog:server:aurora",
+    "beta": "balrog:server:beta",
+    "release": "balrog:server:release",
+    "esr102": "balrog:server:esr",
+    "esr115": "balrog:server:esr",
+    "default": "balrog:server:dep",
+}
+
+
+""" The list of the release promotion phases which we send notifications for
+"""
+RELEASE_NOTIFICATION_PHASES = ("promote", "push", "ship")
+
+
+def add_scope_prefix(config, scope):
+    """
+    Prepends the scriptworker scope prefix from the :ref:`graph config
+    <taskgraph-graph-config>`.
+
+    Args:
+        config (TransformConfig): The configuration for the kind being transformed.
+        scope (string): The suffix of the scope
+
+    Returns:
+        string: the scope to use.
+    """
+    return "{prefix}:{scope}".format(
+        prefix=config.graph_config["scriptworker"]["scope-prefix"],
+        scope=scope,
+    )
+
+
+def with_scope_prefix(f):
+    """
+    Wraps a function, calling :py:func:`add_scope_prefix` on the result of
+    calling the wrapped function.
+
+    Args:
+        f (callable): A function that takes a ``config`` and some keyword
+            arguments, and returns a scope suffix.
+
+    Returns:
+        callable: the wrapped function
+    """
+
+    @functools.wraps(f)
+    def wrapper(config, **kwargs):
+        scope_or_scopes = f(config, **kwargs)
+        if isinstance(scope_or_scopes, list):
+            return map(functools.partial(add_scope_prefix, config), scope_or_scopes)
+        return add_scope_prefix(config, scope_or_scopes)
+
+    return wrapper
+
+
+# scope functions {{{1
+@with_scope_prefix
+def get_scope_from_project(config, alias_to_project_map, alias_to_scope_map):
+    """Determine the restricted scope from `config.params['project']`.
+
+    Args:
+        config (TransformConfig): The configuration for the kind being transformed.
+        alias_to_project_map (list of lists): each list pair contains the
+            alias and the set of projects that match.  This is ordered.
+        alias_to_scope_map (dict): the alias alias to scope
+
+    Returns:
+        string: the scope to use.
+    """
+    for alias, projects in alias_to_project_map:
+        if config.params["project"] in projects and alias in alias_to_scope_map:
+            return alias_to_scope_map[alias]
+    return alias_to_scope_map["default"]
+
+
+@with_scope_prefix
+def get_scope_from_release_type(config, release_type_to_scope_map):
+    """Determine the restricted scope from `config.params['target_tasks_method']`.
+
+    Args:
+        config (TransformConfig): The configuration for the kind being transformed.
+        release_type_to_scope_map (dict): the maps release types to scopes
+
+    Returns:
+        string: the scope to use.
+    """
+    return release_type_to_scope_map.get(
+        config.params["release_type"], release_type_to_scope_map["default"]
+    )
+
+
+def get_phase_from_target_method(config, alias_to_tasks_map, alias_to_phase_map):
+    """Determine the phase from `config.params['target_tasks_method']`.
+
+    Args:
+        config (TransformConfig): The configuration for the kind being transformed.
+        alias_to_tasks_map (list of lists): each list pair contains the
+            alias and the set of target methods that match. This is ordered.
+        alias_to_phase_map (dict): the alias to phase map
+
+    Returns:
+        string: the phase to use.
+    """
+    for alias, tasks in alias_to_tasks_map:
+        if (
+            config.params["target_tasks_method"] in tasks
+            and alias in alias_to_phase_map
+        ):
+            return alias_to_phase_map[alias]
+    return alias_to_phase_map["default"]
+
+
+get_signing_cert_scope = functools.partial(
+    get_scope_from_project,
+    alias_to_project_map=SIGNING_SCOPE_ALIAS_TO_PROJECT,
+    alias_to_scope_map=SIGNING_CERT_SCOPES,
+)
+
+get_devedition_signing_cert_scope = functools.partial(
+    get_scope_from_project,
+    alias_to_project_map=DEVEDITION_SIGNING_SCOPE_ALIAS_TO_PROJECT,
+    alias_to_scope_map=DEVEDITION_SIGNING_CERT_SCOPES,
+)
+
+get_beetmover_bucket_scope = functools.partial(
+    get_scope_from_project,
+    alias_to_project_map=BEETMOVER_SCOPE_ALIAS_TO_PROJECT,
+    alias_to_scope_map=BEETMOVER_BUCKET_SCOPES,
+)
+
+get_beetmover_apt_repo_scope = functools.partial(
+    get_scope_from_project,
+    alias_to_project_map=BEETMOVER_SCOPE_ALIAS_TO_PROJECT,
+    alias_to_scope_map=BEETMOVER_APT_REPO_SCOPES,
+)
+
+get_beetmover_repo_action_scope = functools.partial(
+    get_scope_from_release_type,
+    release_type_to_scope_map=BEETMOVER_REPO_ACTION_SCOPES,
+)
+
+get_beetmover_action_scope = functools.partial(
+    get_scope_from_release_type,
+    release_type_to_scope_map=BEETMOVER_ACTION_SCOPES,
+)
+
+get_balrog_server_scope = functools.partial(
+    get_scope_from_project,
+    alias_to_project_map=BALROG_SCOPE_ALIAS_TO_PROJECT,
+    alias_to_scope_map=BALROG_SERVER_SCOPES,
+)
+
+cached_load_yaml = memoize(load_yaml)
+
+
+# release_config {{{1
+def get_release_config(config):
+    """Get the build number and version for a release task.
+
+    Currently only applies to beetmover tasks.
+
+    Args:
+        config (TransformConfig): The configuration for the kind being transformed.
+
+    Returns:
+        dict: containing both `build_number` and `version`.  This can be used to
+            update `task.payload`.
+    """
+    release_config = {}
+
+    partial_updates = os.environ.get("PARTIAL_UPDATES", "")
+    if partial_updates != "" and config.kind in (
+        "release-bouncer-sub",
+        "release-bouncer-check",
+        "release-update-verify-config",
+        "release-secondary-update-verify-config",
+        "release-balrog-submit-toplevel",
+        "release-secondary-balrog-submit-toplevel",
+    ):
+        partial_updates = json.loads(partial_updates)
+        release_config["partial_versions"] = ", ".join(
+            [
+                "{}build{}".format(v, info["buildNumber"])
+                for v, info in partial_updates.items()
+            ]
+        )
+        if release_config["partial_versions"] == "{}":
+            del release_config["partial_versions"]
+
+    release_config["version"] = config.params["version"]
+    release_config["appVersion"] = config.params["app_version"]
+
+    release_config["next_version"] = config.params["next_version"]
+    release_config["build_number"] = config.params["build_number"]
+    return release_config
+
+
+def get_signing_cert_scope_per_platform(build_platform, is_shippable, config):
+    if "devedition" in build_platform:
+        return get_devedition_signing_cert_scope(config)
+    if is_shippable:
+        return get_signing_cert_scope(config)
+    return add_scope_prefix(config, "signing:cert:dep-signing")
+
+
+# generate_beetmover_upstream_artifacts {{{1
+def generate_beetmover_upstream_artifacts(
+    config, job, platform, locale=None, dependencies=None, **kwargs
+):
+    """Generate the upstream artifacts for beetmover, using the artifact map.
+
+    Currently only applies to beetmover tasks.
+
+    Args:
+        job (dict): The current job being generated
+        dependencies (list): A list of the job's dependency labels.
+        platform (str): The current build platform
+        locale (str): The current locale being beetmoved.
+
+    Returns:
+        list: A list of dictionaries conforming to the upstream_artifacts spec.
+    """
+    base_artifact_prefix = get_artifact_prefix(job)
+    resolve_keyed_by(
+        job,
+        "attributes.artifact_map",
+        "artifact map",
+        **{
+            "release-type": config.params["release_type"],
+            "platform": platform,
+        },
+    )
+    map_config = copy_task(cached_load_yaml(job["attributes"]["artifact_map"]))
+    upstream_artifacts = list()
+
+    if not locale:
+        locales = map_config["default_locales"]
+    elif isinstance(locale, list):
+        locales = locale
+    else:
+        locales = [locale]
+
+    if not dependencies:
+        if job.get("dependencies"):
+            dependencies = job["dependencies"].keys()
+        elif job.get("primary-dependency"):
+            dependencies = [job["primary-dependency"].kind]
+        else:
+            raise Exception(f"Unsupported type of dependency. Got job: {job}")
+
+    for locale, dep in itertools.product(locales, dependencies):
+        paths = list()
+
+        for filename in map_config["mapping"]:
+            resolve_keyed_by(
+                map_config["mapping"][filename],
+                "from",
+                f"beetmover filename {filename}",
+                platform=platform,
+            )
+            if dep not in map_config["mapping"][filename]["from"]:
+                continue
+            if locale != "en-US" and not map_config["mapping"][filename]["all_locales"]:
+                continue
+            if (
+                "only_for_platforms" in map_config["mapping"][filename]
+                and platform
+                not in map_config["mapping"][filename]["only_for_platforms"]
+            ):
+                continue
+            if (
+                "not_for_platforms" in map_config["mapping"][filename]
+                and platform in map_config["mapping"][filename]["not_for_platforms"]
+            ):
+                continue
+            if "partials_only" in map_config["mapping"][filename]:
+                continue
+            # The next time we look at this file it might be a different locale.
+            file_config = copy_task(map_config["mapping"][filename])
+            resolve_keyed_by(
+                file_config,
+                "source_path_modifier",
+                "source path modifier",
+                locale=locale,
+            )
+
+            kwargs["locale"] = locale
+
+            paths.append(
+                os.path.join(
+                    base_artifact_prefix,
+                    jsone.render(file_config["source_path_modifier"], kwargs),
+                    jsone.render(filename, kwargs),
+                )
+            )
+
+        if (
+            job.get("dependencies")
+            and getattr(job["dependencies"][dep], "attributes", None)
+            and job["dependencies"][dep].attributes.get("release_artifacts")
+        ):
+            paths = [
+                path
+                for path in paths
+                if path in job["dependencies"][dep].attributes["release_artifacts"]
+            ]
+
+        if not paths:
+            continue
+
+        upstream_artifacts.append(
+            {
+                "taskId": {"task-reference": f"<{dep}>"},
+                "taskType": map_config["tasktype_map"].get(dep),
+                "paths": sorted(paths),
+                "locale": locale,
+            }
+        )
+
+    upstream_artifacts.sort(key=lambda u: u["paths"])
+    return upstream_artifacts
+
+
+def generate_artifact_registry_gcs_sources(dep):
+    gcs_sources = []
+    locale = dep.attributes.get("locale")
+    if not locale:
+        repackage_deb_reference = "<repackage-deb>"
+        repackage_deb_artifact = "public/build/target.deb"
+    else:
+        repackage_deb_reference = "<repackage-deb-l10n>"
+        repackage_deb_artifact = f"public/build/{locale}/target.langpack.deb"
+    for config in dep.task["payload"]["artifactMap"]:
+        if (
+            config["taskId"]["task-reference"] == repackage_deb_reference
+            and repackage_deb_artifact in config["paths"]
+        ):
+            gcs_sources.append(
+                config["paths"][repackage_deb_artifact]["destinations"][0]
+            )
+    return gcs_sources
+
+
+# generate_beetmover_artifact_map {{{1
+def generate_beetmover_artifact_map(config, job, **kwargs):
+    """Generate the beetmover artifact map.
+
+    Currently only applies to beetmover tasks.
+
+    Args:
+        config (): Current taskgraph configuration.
+        job (dict): The current job being generated
+    Common kwargs:
+        platform (str): The current build platform
+        locale (str): The current locale being beetmoved.
+
+    Returns:
+        list: A list of dictionaries containing source->destination
+            maps for beetmover.
+    """
+    platform = kwargs.get("platform", "")
+    resolve_keyed_by(
+        job,
+        "attributes.artifact_map",
+        job["label"],
+        **{
+            "release-type": config.params["release_type"],
+            "platform": platform,
+        },
+    )
+    map_config = copy_task(cached_load_yaml(job["attributes"]["artifact_map"]))
+    base_artifact_prefix = map_config.get(
+        "base_artifact_prefix", get_artifact_prefix(job)
+    )
+
+    artifacts = list()
+
+    dependencies = job["dependencies"].keys()
+
+    if kwargs.get("locale"):
+        if isinstance(kwargs["locale"], list):
+            locales = kwargs["locale"]
+        else:
+            locales = [kwargs["locale"]]
+    else:
+        locales = map_config["default_locales"]
+
+    resolve_keyed_by(map_config, "s3_bucket_paths", job["label"], platform=platform)
+
+    for locale, dep in sorted(itertools.product(locales, dependencies)):
+        paths = dict()
+        for filename in map_config["mapping"]:
+            # Relevancy checks
+            resolve_keyed_by(
+                map_config["mapping"][filename], "from", "blah", platform=platform
+            )
+            if dep not in map_config["mapping"][filename]["from"]:
+                # We don't get this file from this dependency.
+                continue
+            if locale != "en-US" and not map_config["mapping"][filename]["all_locales"]:
+                # This locale either doesn't produce or shouldn't upload this file.
+                continue
+            if (
+                "only_for_platforms" in map_config["mapping"][filename]
+                and platform
+                not in map_config["mapping"][filename]["only_for_platforms"]
+            ):
+                # This platform either doesn't produce or shouldn't upload this file.
+                continue
+            if (
+                "not_for_platforms" in map_config["mapping"][filename]
+                and platform in map_config["mapping"][filename]["not_for_platforms"]
+            ):
+                # This platform either doesn't produce or shouldn't upload this file.
+                continue
+            if "partials_only" in map_config["mapping"][filename]:
+                continue
+
+            # copy_task because the next time we look at this file the locale will differ.
+            file_config = copy_task(map_config["mapping"][filename])
+
+            for field in [
+                "destinations",
+                "locale_prefix",
+                "source_path_modifier",
+                "update_balrog_manifest",
+                "pretty_name",
+                "checksums_path",
+            ]:
+                resolve_keyed_by(
+                    file_config, field, job["label"], locale=locale, platform=platform
+                )
+
+            # This format string should ideally be in the configuration file,
+            # but this would mean keeping variable names in sync between code + config.
+            destinations = [
+                "{s3_bucket_path}/{dest_path}/{locale_prefix}{filename}".format(
+                    s3_bucket_path=bucket_path,
+                    dest_path=dest_path,
+                    locale_prefix=file_config["locale_prefix"],
+                    filename=file_config.get("pretty_name", filename),
+                )
+                for dest_path, bucket_path in itertools.product(
+                    file_config["destinations"], map_config["s3_bucket_paths"]
+                )
+            ]
+            # Creating map entries
+            # Key must be artifact path, to avoid trampling duplicates, such
+            # as public/build/target.apk and public/build/en-US/target.apk
+            key = os.path.join(
+                base_artifact_prefix,
+                file_config["source_path_modifier"],
+                filename,
+            )
+
+            paths[key] = {
+                "destinations": destinations,
+            }
+            if file_config.get("checksums_path"):
+                paths[key]["checksums_path"] = file_config["checksums_path"]
+
+            # optional flag: balrog manifest
+            if file_config.get("update_balrog_manifest"):
+                paths[key]["update_balrog_manifest"] = True
+                if file_config.get("balrog_format"):
+                    paths[key]["balrog_format"] = file_config["balrog_format"]
+
+        if not paths:
+            # No files for this dependency/locale combination.
+            continue
+
+        # Render all variables for the artifact map
+        platforms = copy_task(map_config.get("platform_names", {}))
+        if platform:
+            for key in platforms.keys():
+                resolve_keyed_by(platforms, key, job["label"], platform=platform)
+
+        upload_date = datetime.fromtimestamp(config.params["build_date"])
+
+        kwargs.update(
+            {
+                "locale": locale,
+                "version": config.params["version"],
+                "branch": config.params["project"],
+                "build_number": config.params["build_number"],
+                "year": upload_date.year,
+                "month": upload_date.strftime("%m"),  # zero-pad the month
+                "upload_date": upload_date.strftime("%Y-%m-%d-%H-%M-%S"),
+            }
+        )
+        kwargs.update(**platforms)
+        paths = jsone.render(paths, kwargs)
+        artifacts.append(
+            {
+                "taskId": {"task-reference": f"<{dep}>"},
+                "locale": locale,
+                "paths": paths,
+            }
+        )
+
+    return artifacts
+
+
+# generate_beetmover_partials_artifact_map {{{1
+def generate_beetmover_partials_artifact_map(config, job, partials_info, **kwargs):
+    """Generate the beetmover partials artifact map.
+
+    Currently only applies to beetmover tasks.
+
+    Args:
+        config (): Current taskgraph configuration.
+        job (dict): The current job being generated
+        partials_info (dict): Current partials and information about them in a dict
+    Common kwargs:
+        platform (str): The current build platform
+        locale (str): The current locale being beetmoved.
+
+    Returns:
+        list: A list of dictionaries containing source->destination
+            maps for beetmover.
+    """
+    platform = kwargs.get("platform", "")
+    resolve_keyed_by(
+        job,
+        "attributes.artifact_map",
+        "artifact map",
+        **{
+            "release-type": config.params["release_type"],
+            "platform": platform,
+        },
+    )
+    map_config = copy_task(cached_load_yaml(job["attributes"]["artifact_map"]))
+    base_artifact_prefix = map_config.get(
+        "base_artifact_prefix", get_artifact_prefix(job)
+    )
+
+    artifacts = list()
+    dependencies = job["dependencies"].keys()
+
+    if kwargs.get("locale"):
+        locales = [kwargs["locale"]]
+    else:
+        locales = map_config["default_locales"]
+
+    resolve_keyed_by(
+        map_config, "s3_bucket_paths", "s3_bucket_paths", platform=platform
+    )
+
+    platforms = copy_task(map_config.get("platform_names", {}))
+    if platform:
+        for key in platforms.keys():
+            resolve_keyed_by(platforms, key, key, platform=platform)
+    upload_date = datetime.fromtimestamp(config.params["build_date"])
+
+    for locale, dep in itertools.product(locales, dependencies):
+        paths = dict()
+        for filename in map_config["mapping"]:
+            # Relevancy checks
+            if dep not in map_config["mapping"][filename]["from"]:
+                # We don't get this file from this dependency.
+                continue
+            if locale != "en-US" and not map_config["mapping"][filename]["all_locales"]:
+                # This locale either doesn't produce or shouldn't upload this file.
+                continue
+            if "partials_only" not in map_config["mapping"][filename]:
+                continue
+            # copy_task because the next time we look at this file the locale will differ.
+            file_config = copy_task(map_config["mapping"][filename])
+
+            for field in [
+                "destinations",
+                "locale_prefix",
+                "source_path_modifier",
+                "update_balrog_manifest",
+                "from_buildid",
+                "pretty_name",
+                "checksums_path",
+            ]:
+                resolve_keyed_by(
+                    file_config, field, field, locale=locale, platform=platform
+                )
+
+            # This format string should ideally be in the configuration file,
+            # but this would mean keeping variable names in sync between code + config.
+            destinations = [
+                "{s3_bucket_path}/{dest_path}/{locale_prefix}{filename}".format(
+                    s3_bucket_path=bucket_path,
+                    dest_path=dest_path,
+                    locale_prefix=file_config["locale_prefix"],
+                    filename=file_config.get("pretty_name", filename),
+                )
+                for dest_path, bucket_path in itertools.product(
+                    file_config["destinations"], map_config["s3_bucket_paths"]
+                )
+            ]
+            # Creating map entries
+            # Key must be artifact path, to avoid trampling duplicates, such
+            # as public/build/target.apk and public/build/en-US/target.apk
+            key = os.path.join(
+                base_artifact_prefix,
+                file_config["source_path_modifier"],
+                filename,
+            )
+            partials_paths = {}
+            for pname, info in partials_info.items():
+                partials_paths[key] = {
+                    "destinations": destinations,
+                }
+                if file_config.get("checksums_path"):
+                    partials_paths[key]["checksums_path"] = file_config[
+                        "checksums_path"
+                    ]
+
+                # optional flag: balrog manifest
+                if file_config.get("update_balrog_manifest"):
+                    partials_paths[key]["update_balrog_manifest"] = True
+                    if file_config.get("balrog_format"):
+                        partials_paths[key]["balrog_format"] = file_config[
+                            "balrog_format"
+                        ]
+                # optional flag: from_buildid
+                if file_config.get("from_buildid"):
+                    partials_paths[key]["from_buildid"] = file_config["from_buildid"]
+
+                # render buildid
+                kwargs.update(
+                    {
+                        "partial": pname,
+                        "from_buildid": info["buildid"],
+                        "previous_version": info.get("previousVersion"),
+                        "buildid": str(config.params["moz_build_date"]),
+                        "locale": locale,
+                        "version": config.params["version"],
+                        "branch": config.params["project"],
+                        "build_number": config.params["build_number"],
+                        "year": upload_date.year,
+                        "month": upload_date.strftime("%m"),  # zero-pad the month
+                        "upload_date": upload_date.strftime("%Y-%m-%d-%H-%M-%S"),
+                    }
+                )
+                kwargs.update(**platforms)
+                paths.update(jsone.render(partials_paths, kwargs))
+
+        if not paths:
+            continue
+
+        artifacts.append(
+            {
+                "taskId": {"task-reference": f"<{dep}>"},
+                "locale": locale,
+                "paths": paths,
+            }
+        )
+
+    artifacts.sort(key=lambda a: sorted(a["paths"].items()))
+    return artifacts
diff --git a/taskcluster/gecko_taskgraph/util/signed_artifacts.py b/taskcluster/gecko_taskgraph/util/signed_artifacts.py
new file mode 100644
index 0000000000..2467ff8046
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/util/signed_artifacts.py
@@ -0,0 +1,198 @@
+# 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/.
+"""
+Defines artifacts to sign before repackage.
+"""
+
+from taskgraph.util.taskcluster import get_artifact_path
+
+from gecko_taskgraph.util.declarative_artifacts import get_geckoview_upstream_artifacts
+
+LANGPACK_SIGN_PLATFORMS = {  # set
+    "linux64-shippable",
+    "linux64-devedition",
+    "macosx64-shippable",
+    "macosx64-devedition",
+}
+
+
+def is_partner_kind(kind):
+    if kind and kind.startswith(("release-partner", "release-eme-free")):
+        return True
+
+
+def is_notarization_kind(kind):
+    if kind and "notarization" in kind:
+        return True
+
+
+def is_mac_signing_king(kind):
+    return kind and "mac-signing" in kind
+
+
+def generate_specifications_of_artifacts_to_sign(
+    config, job, keep_locale_template=True, kind=None, dep_kind=None
+):
+    build_platform = job["attributes"].get("build_platform")
+    use_stub = job["attributes"].get("stub-installer")
+    # Get locales to know if we want to sign ja-JP-mac langpack
+    locales = job["attributes"].get("chunk_locales", [])
+    if kind == "release-source-signing":
+        artifacts_specifications = [
+            {
+                "artifacts": [get_artifact_path(job, "source.tar.xz")],
+                "formats": ["autograph_gpg"],
+            }
+        ]
+    elif "android" in build_platform:
+        artifacts_specifications = [
+            {
+                "artifacts": get_geckoview_artifacts_to_sign(config, job),
+                "formats": ["autograph_gpg"],
+            }
+        ]
+    # XXX: Mars aren't signed here (on any platform) because internals will be
+    # signed at after this stage of the release
+    elif "macosx" in build_platform:
+        langpack_formats = []
+        if is_notarization_kind(config.kind):
+            formats = ["apple_notarization"]
+            artifacts_specifications = [
+                {
+                    "artifacts": [
+                        get_artifact_path(job, "{locale}/target.tar.gz"),
+                        get_artifact_path(job, "{locale}/target.pkg"),
+                    ],
+                    "formats": formats,
+                }
+            ]
+        else:
+            # This task is mac-signing
+            if is_partner_kind(kind):
+                extension = "tar.gz"
+            else:
+                extension = "dmg"
+            artifacts_specifications = [
+                {
+                    "artifacts": [
+                        get_artifact_path(job, f"{{locale}}/target.{extension}")
+                    ],
+                    "formats": ["macapp", "autograph_widevine", "autograph_omnija"],
+                }
+            ]
+            langpack_formats = ["autograph_langpack"]
+
+        if "ja-JP-mac" in locales and build_platform in LANGPACK_SIGN_PLATFORMS:
+            artifacts_specifications += [
+                {
+                    "artifacts": [
+                        get_artifact_path(job, "ja-JP-mac/target.langpack.xpi")
+                    ],
+                    "formats": langpack_formats,
+                }
+            ]
+    elif "win" in build_platform:
+        artifacts_specifications = [
+            {
+                "artifacts": [
+                    get_artifact_path(job, "{locale}/setup.exe"),
+                ],
+                "formats": ["autograph_authenticode_sha2"],
+            },
+            {
+                "artifacts": [
+                    get_artifact_path(job, "{locale}/target.zip"),
+                ],
+                "formats": [
+                    "autograph_authenticode_sha2",
+                    "autograph_widevine",
+                    "autograph_omnija",
+                ],
+            },
+        ]
+
+        if use_stub:
+            artifacts_specifications[0]["artifacts"] += [
+                get_artifact_path(job, "{locale}/setup-stub.exe")
+            ]
+    elif "linux" in build_platform:
+        artifacts_specifications = [
+            {
+                "artifacts": [get_artifact_path(job, "{locale}/target.tar.bz2")],
+                "formats": ["autograph_gpg", "autograph_widevine", "autograph_omnija"],
+            }
+        ]
+        if build_platform in LANGPACK_SIGN_PLATFORMS:
+            artifacts_specifications += [
+                {
+                    "artifacts": [
+                        get_artifact_path(job, "{locale}/target.langpack.xpi")
+                    ],
+                    "formats": ["autograph_langpack"],
+                }
+            ]
+    else:
+        raise Exception("Platform not implemented for signing")
+
+    if not keep_locale_template:
+        artifacts_specifications = _strip_locale_template(artifacts_specifications)
+
+    if is_partner_kind(kind):
+        artifacts_specifications = _strip_widevine_for_partners(
+            artifacts_specifications
+        )
+
+    return artifacts_specifications
+
+
+def _strip_locale_template(artifacts_without_locales):
+    for spec in artifacts_without_locales:
+        for index, artifact in enumerate(spec["artifacts"]):
+            stripped_artifact = artifact.format(locale="")
+            stripped_artifact = stripped_artifact.replace("//", "/")
+            spec["artifacts"][index] = stripped_artifact
+
+    return artifacts_without_locales
+
+
+def _strip_widevine_for_partners(artifacts_specifications):
+    """Partner repacks should not resign that's previously signed for fear of breaking partial
+    updates
+    """
+    for spec in artifacts_specifications:
+        if "autograph_widevine" in spec["formats"]:
+            spec["formats"].remove("autograph_widevine")
+        if "autograph_omnija" in spec["formats"]:
+            spec["formats"].remove("autograph_omnija")
+
+    return artifacts_specifications
+
+
+def get_signed_artifacts(input, formats, behavior=None):
+    """
+    Get the list of signed artifacts for the given input and formats.
+    """
+    artifacts = set()
+    if input.endswith(".dmg"):
+        artifacts.add(input.replace(".dmg", ".tar.gz"))
+        if behavior and behavior != "mac_sign":
+            artifacts.add(input.replace(".dmg", ".pkg"))
+    else:
+        artifacts.add(input)
+    if "autograph_gpg" in formats:
+        artifacts.add(f"{input}.asc")
+
+    return artifacts
+
+
+def get_geckoview_artifacts_to_sign(config, job):
+    upstream_artifacts = []
+    for package in job["attributes"]["maven_packages"]:
+        upstream_artifacts += get_geckoview_upstream_artifacts(config, job, package)
+    return [
+        path
+        for upstream_artifact in upstream_artifacts
+        for path in upstream_artifact["paths"]
+        if not path.endswith(".md5") and not path.endswith(".sha1")
+    ]
diff --git a/taskcluster/gecko_taskgraph/util/taskcluster.py b/taskcluster/gecko_taskgraph/util/taskcluster.py
new file mode 100644
index 0000000000..cddb01fd37
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/util/taskcluster.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 logging
+import os
+
+import taskcluster_urls as liburls
+from taskcluster import Hooks
+from taskgraph.util import taskcluster as tc_util
+from taskgraph.util.taskcluster import (
+    _do_request,
+    get_index_url,
+    get_root_url,
+    get_task_definition,
+    get_task_url,
+)
+
+logger = logging.getLogger(__name__)
+
+
+def insert_index(index_path, task_id, data=None, use_proxy=False):
+    index_url = get_index_url(index_path, use_proxy=use_proxy)
+
+    # Find task expiry.
+    expires = get_task_definition(task_id, use_proxy=use_proxy)["expires"]
+
+    response = _do_request(
+        index_url,
+        method="put",
+        json={
+            "taskId": task_id,
+            "rank": 0,
+            "data": data or {},
+            "expires": expires,
+        },
+    )
+    return response
+
+
+def status_task(task_id, use_proxy=False):
+    """Gets the status of a task given a task_id.
+
+    In testing mode, just logs that it would have retrieved status.
+
+    Args:
+        task_id (str): A task id.
+        use_proxy (bool): Whether to use taskcluster-proxy (default: False)
+
+    Returns:
+        dict: A dictionary object as defined here:
+          https://docs.taskcluster.net/docs/reference/platform/queue/api#status
+    """
+    if tc_util.testing:
+        logger.info(f"Would have gotten status for {task_id}.")
+    else:
+        resp = _do_request(get_task_url(task_id, use_proxy) + "/status")
+        status = resp.json().get("status", {})
+        return status
+
+
+def state_task(task_id, use_proxy=False):
+    """Gets the state of a task given a task_id.
+
+    In testing mode, just logs that it would have retrieved state. This is a subset of the
+    data returned by :func:`status_task`.
+
+    Args:
+        task_id (str): A task id.
+        use_proxy (bool): Whether to use taskcluster-proxy (default: False)
+
+    Returns:
+        str: The state of the task, one of
+          ``pending, running, completed, failed, exception, unknown``.
+    """
+    if tc_util.testing:
+        logger.info(f"Would have gotten state for {task_id}.")
+    else:
+        status = status_task(task_id, use_proxy=use_proxy).get("state") or "unknown"
+        return status
+
+
+def trigger_hook(hook_group_id, hook_id, hook_payload):
+    hooks = Hooks({"rootUrl": get_root_url(True)})
+    response = hooks.triggerHook(hook_group_id, hook_id, hook_payload)
+
+    logger.info(
+        "Task seen here: {}/tasks/{}".format(
+            get_root_url(os.environ.get("TASKCLUSTER_PROXY_URL")),
+            response["status"]["taskId"],
+        )
+    )
+
+
+def list_task_group_tasks(task_group_id):
+    """Generate the tasks in a task group"""
+    params = {}
+    while True:
+        url = liburls.api(
+            get_root_url(False),
+            "queue",
+            "v1",
+            f"task-group/{task_group_id}/list",
+        )
+        resp = _do_request(url, method="get", params=params).json()
+        yield from resp["tasks"]
+        if resp.get("continuationToken"):
+            params = {"continuationToken": resp.get("continuationToken")}
+        else:
+            break
+
+
+def list_task_group_incomplete_task_ids(task_group_id):
+    states = ("running", "pending", "unscheduled")
+    for task in [t["status"] for t in list_task_group_tasks(task_group_id)]:
+        if task["state"] in states:
+            yield task["taskId"]
+
+
+def list_task_group_complete_tasks(task_group_id):
+    tasks = {}
+    for task in list_task_group_tasks(task_group_id):
+        if task.get("status", {}).get("state", "") == "completed":
+            tasks[task.get("task", {}).get("metadata", {}).get("name", "")] = task.get(
+                "status", {}
+            ).get("taskId", "")
+    return tasks
diff --git a/taskcluster/gecko_taskgraph/util/taskgraph.py b/taskcluster/gecko_taskgraph/util/taskgraph.py
new file mode 100644
index 0000000000..bac7b3fbb8
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/util/taskgraph.py
@@ -0,0 +1,49 @@
+# 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/.
+
+"""
+Tools for interacting with existing taskgraphs.
+"""
+
+from taskgraph.util.taskcluster import find_task_id, get_artifact
+
+
+def find_decision_task(parameters, graph_config):
+    """Given the parameters for this action, find the taskId of the decision
+    task"""
+    head_rev_param = "{}head_rev".format(graph_config["project-repo-param-prefix"])
+    return find_task_id(
+        "{}.v2.{}.revision.{}.taskgraph.decision".format(
+            graph_config["trust-domain"],
+            parameters["project"],
+            parameters[head_rev_param],
+        )
+    )
+
+
+def find_existing_tasks(previous_graph_ids):
+    existing_tasks = {}
+    for previous_graph_id in previous_graph_ids:
+        label_to_taskid = get_artifact(previous_graph_id, "public/label-to-taskid.json")
+        existing_tasks.update(label_to_taskid)
+    return existing_tasks
+
+
+def find_existing_tasks_from_previous_kinds(
+    full_task_graph, previous_graph_ids, rebuild_kinds
+):
+    """Given a list of previous decision/action taskIds and kinds to ignore
+    from the previous graphs, return a dictionary of labels-to-taskids to use
+    as ``existing_tasks`` in the optimization step."""
+    existing_tasks = find_existing_tasks(previous_graph_ids)
+    kind_labels = {
+        t.label
+        for t in full_task_graph.tasks.values()
+        if t.attributes["kind"] not in rebuild_kinds
+    }
+    return {
+        label: taskid
+        for (label, taskid) in existing_tasks.items()
+        if label in kind_labels
+    }
diff --git a/taskcluster/gecko_taskgraph/util/templates.py b/taskcluster/gecko_taskgraph/util/templates.py
new file mode 100644
index 0000000000..e6640a7edd
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/util/templates.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/.
+
+
+from gecko_taskgraph.util.copy_task import copy_task
+
+
+def merge_to(source, dest):
+    """
+    Merge dict and arrays (override scalar values)
+
+    Keys from source override keys from dest, and elements from lists in source
+    are appended to lists in dest.
+
+    :param dict source: to copy from
+    :param dict dest: to copy to (modified in place)
+    """
+
+    for key, value in source.items():
+        if (
+            isinstance(value, dict)
+            and len(value) == 1
+            and list(value)[0].startswith("by-")
+        ):
+            # Do not merge by-* values as this is likely to confuse someone
+            dest[key] = value
+            continue
+
+        # Override mismatching or empty types
+        if type(value) != type(dest.get(key)):  # noqa
+            dest[key] = value
+            continue
+
+        # Merge dict
+        if isinstance(value, dict):
+            merge_to(value, dest[key])
+            continue
+
+        if isinstance(value, list):
+            dest[key] = dest[key] + value
+            continue
+
+        dest[key] = value
+
+    return dest
+
+
+def merge(*objects):
+    """
+    Merge the given objects, using the semantics described for merge_to, with
+    objects later in the list taking precedence.  From an inheritance
+    perspective, "parents" should be listed before "children".
+
+    Returns the result without modifying any arguments.
+    """
+    if len(objects) == 1:
+        return copy_task(objects[0])
+    return merge_to(objects[-1], merge(*objects[:-1]))
diff --git a/taskcluster/gecko_taskgraph/util/verify.py b/taskcluster/gecko_taskgraph/util/verify.py
new file mode 100644
index 0000000000..75ddbda674
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/util/verify.py
@@ -0,0 +1,454 @@
+# 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
+import os
+import re
+import sys
+
+import attr
+from taskgraph.util.treeherder import join_symbol
+from taskgraph.util.verify import VerificationSequence
+
+from gecko_taskgraph import GECKO
+from gecko_taskgraph.util.attributes import (
+    ALL_PROJECTS,
+    RELEASE_PROJECTS,
+    RUN_ON_PROJECT_ALIASES,
+)
+
+logger = logging.getLogger(__name__)
+doc_base_path = os.path.join(GECKO, "taskcluster", "docs")
+
+
+verifications = VerificationSequence()
+
+
+@attr.s(frozen=True)
+class DocPaths:
+    _paths = attr.ib(factory=list)
+
+    def get_files(self, filename):
+        rv = []
+        for p in self._paths:
+            doc_path = os.path.join(p, filename)
+            if os.path.exists(doc_path):
+                rv.append(doc_path)
+        return rv
+
+    def add(self, path):
+        """
+        Projects that make use of Firefox's taskgraph can extend it with
+        their own task kinds by registering additional paths for documentation.
+        documentation_paths.add() needs to be called by the project's Taskgraph
+        registration function. See taskgraph.config.
+        """
+        self._paths.append(path)
+
+
+documentation_paths = DocPaths()
+documentation_paths.add(doc_base_path)
+
+
+def verify_docs(filename, identifiers, appearing_as):
+    """
+    Look for identifiers of the type appearing_as in the files
+    returned by documentation_paths.get_files(). Firefox will have
+    a single file in a list, but projects such as Thunderbird can have
+    documentation in another location and may return multiple files.
+    """
+    # We ignore identifiers starting with '_' for the sake of tests.
+    # Strings starting with "_" are ignored for doc verification
+    # hence they can be used for faking test values
+    doc_files = documentation_paths.get_files(filename)
+    doctext = "".join([open(d).read() for d in doc_files])
+
+    if appearing_as == "inline-literal":
+        expression_list = [
+            "``" + identifier + "``"
+            for identifier in identifiers
+            if not identifier.startswith("_")
+        ]
+    elif appearing_as == "heading":
+        expression_list = [
+            "\n" + identifier + "\n(?:(?:(?:-+\n)+)|(?:(?:.+\n)+))"
+            for identifier in identifiers
+            if not identifier.startswith("_")
+        ]
+    else:
+        raise Exception(f"appearing_as = `{appearing_as}` not defined")
+
+    for expression, identifier in zip(expression_list, identifiers):
+        match_group = re.search(expression, doctext)
+        if not match_group:
+            raise Exception(
+                "{}: `{}` missing from doc file: `{}`".format(
+                    appearing_as, identifier, filename
+                )
+            )
+
+
+@verifications.add("initial")
+def verify_run_using():
+    from gecko_taskgraph.transforms.job import registry
+
+    verify_docs(
+        filename="transforms/job.rst",
+        identifiers=registry.keys(),
+        appearing_as="inline-literal",
+    )
+
+
+@verifications.add("parameters")
+def verify_parameters_docs(parameters):
+    if not parameters.strict:
+        return
+
+    parameters_dict = dict(**parameters)
+    verify_docs(
+        filename="parameters.rst",
+        identifiers=list(parameters_dict),
+        appearing_as="inline-literal",
+    )
+
+
+@verifications.add("kinds")
+def verify_kinds_docs(kinds):
+    verify_docs(filename="kinds.rst", identifiers=kinds.keys(), appearing_as="heading")
+
+
+@verifications.add("full_task_set")
+def verify_attributes(task, taskgraph, scratch_pad, graph_config, parameters):
+    if task is None:
+        verify_docs(
+            filename="attributes.rst",
+            identifiers=list(scratch_pad["attribute_set"]),
+            appearing_as="heading",
+        )
+        return
+    scratch_pad.setdefault("attribute_set", set()).update(task.attributes.keys())
+
+
+@verifications.add("full_task_graph")
+def verify_task_graph_symbol(task, taskgraph, scratch_pad, graph_config, parameters):
+    """
+    This function verifies that tuple
+    (collection.keys(), machine.platform, groupSymbol, symbol) is unique
+    for a target task graph.
+    """
+    if task is None:
+        return
+    task_dict = task.task
+    if "extra" in task_dict:
+        extra = task_dict["extra"]
+        if "treeherder" in extra:
+            treeherder = extra["treeherder"]
+
+            collection_keys = tuple(sorted(treeherder.get("collection", {}).keys()))
+            if len(collection_keys) != 1:
+                raise Exception(
+                    "Task {} can't be in multiple treeherder collections "
+                    "(the part of the platform after `/`): {}".format(
+                        task.label, collection_keys
+                    )
+                )
+            platform = treeherder.get("machine", {}).get("platform")
+            group_symbol = treeherder.get("groupSymbol")
+            symbol = treeherder.get("symbol")
+
+            key = (platform, collection_keys[0], group_symbol, symbol)
+            if key in scratch_pad:
+                raise Exception(
+                    "Duplicate treeherder platform and symbol in tasks "
+                    "`{}`and `{}`: {} {}".format(
+                        task.label,
+                        scratch_pad[key],
+                        f"{platform}/{collection_keys[0]}",
+                        join_symbol(group_symbol, symbol),
+                    )
+                )
+            else:
+                scratch_pad[key] = task.label
+
+
+@verifications.add("full_task_graph")
+def verify_trust_domain_v2_routes(
+    task, taskgraph, scratch_pad, graph_config, parameters
+):
+    """
+    This function ensures that any two tasks have distinct ``index.{trust-domain}.v2`` routes.
+    """
+    if task is None:
+        return
+    route_prefix = "index.{}.v2".format(graph_config["trust-domain"])
+    task_dict = task.task
+    routes = task_dict.get("routes", [])
+
+    for route in routes:
+        if route.startswith(route_prefix):
+            if route in scratch_pad:
+                raise Exception(
+                    "conflict between {}:{} for route: {}".format(
+                        task.label, scratch_pad[route], route
+                    )
+                )
+            else:
+                scratch_pad[route] = task.label
+
+
+@verifications.add("full_task_graph")
+def verify_routes_notification_filters(
+    task, taskgraph, scratch_pad, graph_config, parameters
+):
+    """
+    This function ensures that only understood filters for notifications are
+    specified.
+
+    See: https://firefox-ci-tc.services.mozilla.com/docs/manual/using/task-notifications
+    """
+    if task is None:
+        return
+    route_prefix = "notify."
+    valid_filters = ("on-any", "on-completed", "on-failed", "on-exception")
+    task_dict = task.task
+    routes = task_dict.get("routes", [])
+
+    for route in routes:
+        if route.startswith(route_prefix):
+            # Get the filter of the route
+            route_filter = route.split(".")[-1]
+            if route_filter not in valid_filters:
+                raise Exception(
+                    "{} has invalid notification filter ({})".format(
+                        task.label, route_filter
+                    )
+                )
+
+
+@verifications.add("full_task_graph")
+def verify_dependency_tiers(task, taskgraph, scratch_pad, graph_config, parameters):
+    tiers = scratch_pad
+    if task is not None:
+        tiers[task.label] = (
+            task.task.get("extra", {}).get("treeherder", {}).get("tier", sys.maxsize)
+        )
+    else:
+
+        def printable_tier(tier):
+            if tier == sys.maxsize:
+                return "unknown"
+            return tier
+
+        for task in taskgraph.tasks.values():
+            tier = tiers[task.label]
+            for d in task.dependencies.values():
+                if taskgraph[d].task.get("workerType") == "always-optimized":
+                    continue
+                if "dummy" in taskgraph[d].kind:
+                    continue
+                if tier < tiers[d]:
+                    raise Exception(
+                        "{} (tier {}) cannot depend on {} (tier {})".format(
+                            task.label,
+                            printable_tier(tier),
+                            d,
+                            printable_tier(tiers[d]),
+                        )
+                    )
+
+
+@verifications.add("full_task_graph")
+def verify_required_signoffs(task, taskgraph, scratch_pad, graph_config, parameters):
+    """
+    Task with required signoffs can't be dependencies of tasks with less
+    required signoffs.
+    """
+    all_required_signoffs = scratch_pad
+    if task is not None:
+        all_required_signoffs[task.label] = set(
+            task.attributes.get("required_signoffs", [])
+        )
+    else:
+
+        def printable_signoff(signoffs):
+            if len(signoffs) == 1:
+                return "required signoff {}".format(*signoffs)
+            if signoffs:
+                return "required signoffs {}".format(", ".join(signoffs))
+            return "no required signoffs"
+
+        for task in taskgraph.tasks.values():
+            required_signoffs = all_required_signoffs[task.label]
+            for d in task.dependencies.values():
+                if required_signoffs < all_required_signoffs[d]:
+                    raise Exception(
+                        "{} ({}) cannot depend on {} ({})".format(
+                            task.label,
+                            printable_signoff(required_signoffs),
+                            d,
+                            printable_signoff(all_required_signoffs[d]),
+                        )
+                    )
+
+
+@verifications.add("full_task_graph")
+def verify_aliases(task, taskgraph, scratch_pad, graph_config, parameters):
+    """
+    This function verifies that aliases are not reused.
+    """
+    if task is None:
+        return
+    if task.kind not in ("toolchain", "fetch"):
+        return
+    for_kind = scratch_pad.setdefault(task.kind, {})
+    aliases = for_kind.setdefault("aliases", {})
+    alias_attribute = f"{task.kind}-alias"
+    if task.label in aliases:
+        raise Exception(
+            "Task `{}` has a {} of `{}`, masking a task of that name.".format(
+                aliases[task.label],
+                alias_attribute,
+                task.label[len(task.kind) + 1 :],
+            )
+        )
+    labels = for_kind.setdefault("labels", set())
+    labels.add(task.label)
+    attributes = task.attributes
+    if alias_attribute in attributes:
+        keys = attributes[alias_attribute]
+        if not keys:
+            keys = []
+        elif isinstance(keys, str):
+            keys = [keys]
+        for key in keys:
+            full_key = f"{task.kind}-{key}"
+            if full_key in labels:
+                raise Exception(
+                    "Task `{}` has a {} of `{}`,"
+                    " masking a task of that name.".format(
+                        task.label,
+                        alias_attribute,
+                        key,
+                    )
+                )
+            if full_key in aliases:
+                raise Exception(
+                    "Duplicate {} in tasks `{}`and `{}`: {}".format(
+                        alias_attribute,
+                        task.label,
+                        aliases[full_key],
+                        key,
+                    )
+                )
+            else:
+                aliases[full_key] = task.label
+
+
+@verifications.add("optimized_task_graph")
+def verify_always_optimized(task, taskgraph, scratch_pad, graph_config, parameters):
+    """
+    This function ensures that always-optimized tasks have been optimized.
+    """
+    if task is None:
+        return
+    if task.task.get("workerType") == "always-optimized":
+        raise Exception(f"Could not optimize the task {task.label!r}")
+
+
+@verifications.add("full_task_graph", run_on_projects=RELEASE_PROJECTS)
+def verify_shippable_no_sccache(task, taskgraph, scratch_pad, graph_config, parameters):
+    if task and task.attributes.get("shippable"):
+        if task.task.get("payload", {}).get("env", {}).get("USE_SCCACHE"):
+            raise Exception(f"Shippable job {task.label} cannot use sccache")
+
+
+@verifications.add("full_task_graph")
+def verify_test_packaging(task, taskgraph, scratch_pad, graph_config, parameters):
+    if task is None:
+        # In certain cases there are valid reasons for tests to be missing,
+        # don't error out when that happens.
+        missing_tests_allowed = any(
+            (
+                # user specified `--target-kind`
+                parameters.get("target-kind") is not None,
+                # manifest scheduling is enabled
+                parameters["test_manifest_loader"] != "default",
+            )
+        )
+
+        exceptions = []
+        for task in taskgraph.tasks.values():
+            if task.kind == "build" and not task.attributes.get(
+                "skip-verify-test-packaging"
+            ):
+                build_env = task.task.get("payload", {}).get("env", {})
+                package_tests = build_env.get("MOZ_AUTOMATION_PACKAGE_TESTS")
+                shippable = task.attributes.get("shippable", False)
+                build_has_tests = scratch_pad.get(task.label)
+
+                if package_tests != "1":
+                    # Shippable builds should always package tests.
+                    if shippable:
+                        exceptions.append(
+                            "Build job {} is shippable and does not specify "
+                            "MOZ_AUTOMATION_PACKAGE_TESTS=1 in the "
+                            "environment.".format(task.label)
+                        )
+
+                    # Build tasks in the scratch pad have tests dependent on
+                    # them, so we need to package tests during build.
+                    if build_has_tests:
+                        exceptions.append(
+                            "Build job {} has tests dependent on it and does not specify "
+                            "MOZ_AUTOMATION_PACKAGE_TESTS=1 in the environment".format(
+                                task.label
+                            )
+                        )
+                else:
+                    # Build tasks that aren't in the scratch pad have no
+                    # dependent tests, so we shouldn't package tests.
+                    # With the caveat that we expect shippable jobs to always
+                    # produce tests.
+                    if not build_has_tests and not shippable:
+                        # If we have not generated all task kinds, we can't verify that
+                        # there are no dependent tests.
+                        if not missing_tests_allowed:
+                            exceptions.append(
+                                "Build job {} has no tests, but specifies "
+                                "MOZ_AUTOMATION_PACKAGE_TESTS={} in the environment. "
+                                "Unset MOZ_AUTOMATION_PACKAGE_TESTS in the task definition "
+                                "to fix.".format(task.label, package_tests)
+                            )
+        if exceptions:
+            raise Exception("\n".join(exceptions))
+        return
+    if task.kind == "test":
+        build_task = taskgraph[task.dependencies["build"]]
+        scratch_pad[build_task.label] = 1
+
+
+@verifications.add("full_task_graph")
+def verify_run_known_projects(task, taskgraph, scratch_pad, graph_config, parameters):
+    """Validates the inputs in run-on-projects.
+
+    We should never let 'try' (or 'try-comm-central') be in run-on-projects even though it
+    is valid because it is not considered for try pushes.  While here we also validate for
+    other unknown projects or typos.
+    """
+    if task and task.attributes.get("run_on_projects"):
+        projects = set(task.attributes["run_on_projects"])
+        if {"try", "try-comm-central"} & set(projects):
+            raise Exception(
+                "In task {}: using try in run-on-projects is invalid; use try "
+                "selectors to select this task on try".format(task.label)
+            )
+        # try isn't valid, but by the time we get here its not an available project anyway.
+        valid_projects = ALL_PROJECTS | set(RUN_ON_PROJECT_ALIASES.keys())
+        invalid_projects = projects - valid_projects
+        if invalid_projects:
+            raise Exception(
+                "Task '{}' has an invalid run-on-projects value: "
+                "{}".format(task.label, invalid_projects)
+            )
diff --git a/taskcluster/gecko_taskgraph/util/workertypes.py b/taskcluster/gecko_taskgraph/util/workertypes.py
new file mode 100644
index 0000000000..b941ba85f6
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/util/workertypes.py
@@ -0,0 +1,105 @@
+# 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 mozbuild.util import memoize
+from taskgraph.util.attributes import keymatch
+from taskgraph.util.keyed_by import evaluate_keyed_by
+
+from gecko_taskgraph.util.attributes import release_level as _release_level
+
+WORKER_TYPES = {
+    "gce/gecko-1-b-linux": ("docker-worker", "linux"),
+    "gce/gecko-2-b-linux": ("docker-worker", "linux"),
+    "gce/gecko-3-b-linux": ("docker-worker", "linux"),
+    "invalid/invalid": ("invalid", None),
+    "invalid/always-optimized": ("always-optimized", None),
+    "scriptworker-prov-v1/signing-linux-v1": ("scriptworker-signing", None),
+    "scriptworker-k8s/gecko-3-shipit": ("shipit", None),
+    "scriptworker-k8s/gecko-1-shipit": ("shipit", None),
+}
+
+
+@memoize
+def _get(graph_config, alias, level, release_level, project):
+    """Get the configuration for this worker_type alias: {provisioner,
+    worker-type, implementation, os}"""
+    level = str(level)
+
+    # handle the legacy (non-alias) format
+    if "/" in alias:
+        alias = alias.format(level=level)
+        provisioner, worker_type = alias.split("/", 1)
+        try:
+            implementation, os = WORKER_TYPES[alias]
+            return {
+                "provisioner": provisioner,
+                "worker-type": worker_type,
+                "implementation": implementation,
+                "os": os,
+            }
+        except KeyError:
+            return {
+                "provisioner": provisioner,
+                "worker-type": worker_type,
+            }
+
+    matches = keymatch(graph_config["workers"]["aliases"], alias)
+    if len(matches) > 1:
+        raise KeyError("Multiple matches for worker-type alias " + alias)
+    elif not matches:
+        raise KeyError("No matches for worker-type alias " + alias)
+    worker_config = matches[0].copy()
+
+    worker_config["provisioner"] = evaluate_keyed_by(
+        worker_config["provisioner"],
+        f"worker-type alias {alias} field provisioner",
+        {"level": level},
+    ).format(
+        **{
+            "trust-domain": graph_config["trust-domain"],
+            "level": level,
+            "alias": alias,
+        }
+    )
+    attrs = {"level": level, "release-level": release_level}
+    if project:
+        attrs["project"] = project
+    worker_config["worker-type"] = evaluate_keyed_by(
+        worker_config["worker-type"],
+        f"worker-type alias {alias} field worker-type",
+        attrs,
+    ).format(
+        **{
+            "trust-domain": graph_config["trust-domain"],
+            "level": level,
+            "alias": alias,
+        }
+    )
+
+    return worker_config
+
+
+def worker_type_implementation(graph_config, parameters, worker_type):
+    """Get the worker implementation and OS for the given workerType, where the
+    OS represents the host system, not the target OS, in the case of
+    cross-compiles."""
+    worker_config = _get(
+        graph_config, worker_type, "1", "staging", parameters["project"]
+    )
+    return worker_config["implementation"], worker_config.get("os")
+
+
+def get_worker_type(graph_config, parameters, worker_type):
+    """
+    Get the worker type provisioner and worker-type, optionally evaluating
+    aliases from the graph config.
+    """
+    worker_config = _get(
+        graph_config,
+        worker_type,
+        parameters["level"],
+        _release_level(parameters.get("project")),
+        parameters.get("project"),
+    )
+    return worker_config["provisioner"], worker_config["worker-type"]