1 files changed, 78 insertions, 0 deletions
diff --git a/taskcluster/taskgraph/loader/single_dep.py b/taskcluster/taskgraph/loader/single_dep.py
new file mode 100644
index 0000000000..d48b6d4824
--- /dev/null
+++ b/taskcluster/taskgraph/loader/single_dep.py
@@ -0,0 +1,78 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+from __future__ import absolute_import, print_function, unicode_literals
+
+import copy
+
+from voluptuous import Required
+
+from ..task import Task
+from ..util.schema import Schema
+
+schema = Schema(
+    {
+        Required("primary-dependency", "primary dependency task"): Task,
+    }
+)
+
+
+def loader(kind, path, config, params, loaded_tasks):
+    """
+    Load tasks based on the jobs dependant kinds.
+
+    The `only-for-build-platforms` kind configuration, if specified, will limit
+    the build platforms for which a job will be created. Alternatively there is
+    'not-for-build-platforms' kind configuration which will be consulted only after
+    'only-for-build-platforms' is checked (if present), and omit any jobs where the
+    build platform matches.
+
+    Optional `only-for-attributes` kind configuration, if specified, will limit
+    the jobs chosen to ones which have the specified attribute, with the specified
+    value.
+
+    Optional `job-template` kind configuration value, if specified, will be used to
+    pass configuration down to the specified transforms used.
+    """
+    only_platforms = config.get("only-for-build-platforms")
+    not_platforms = config.get("not-for-build-platforms")
+    only_attributes = config.get("only-for-attributes")
+    job_template = config.get("job-template")
+
+    for task in loaded_tasks:
+        if task.kind not in config.get("kind-dependencies", []):
+            continue
+
+        if only_platforms or not_platforms:
+            build_platform = task.attributes.get("build_platform")
+            build_type = task.attributes.get("build_type")
+            if not build_platform or not build_type:
+                continue
+            platform = "{}/{}".format(build_platform, build_type)
+            if only_platforms and platform not in only_platforms:
+                continue
+            elif not_platforms and platform in not_platforms:
+                continue
+
+        if only_attributes:
+            config_attrs = set(only_attributes)
+            if not config_attrs & set(task.attributes):
+                # make sure any attribute exists
+                continue
+
+        job = {
+            "primary-dependency": task,
+        }
+
+        if job_template:
+            job.update(copy.deepcopy(job_template))
+
+        # copy shipping_product from upstream
+        product = task.attributes.get(
+            "shipping_product", task.task.get("shipping-product")
+        )
+        if product:
+            job.setdefault("shipping-product", product)
+
+        yield job