1 files changed, 29 insertions, 0 deletions
diff --git a/taskcluster/gecko_taskgraph/transforms/upstream_artifact_task.py b/taskcluster/gecko_taskgraph/transforms/upstream_artifact_task.py
new file mode 100644
index 0000000000..62f94a8238
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/upstream_artifact_task.py
@@ -0,0 +1,29 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+Find upstream artifact task.
+"""
+
+from taskgraph.transforms.base import TransformSequence
+
+transforms = TransformSequence()
+
+
+@transforms.add
+def find_upstream_artifact_task(config, jobs):
+    for job in jobs:
+        dep_job = None
+        if job.get("dependent-tasks"):
+            dep_labels = [l for l in job["dependent-tasks"].keys()]
+            for label in dep_labels:
+                if label.endswith("-mac-signing"):
+                    assert (
+                        dep_job is None
+                    ), "Can't determine whether " "{} or {} is dep_job!".format(
+                        dep_job.label, label
+                    )
+                    dep_job = job["dependent-tasks"][label]
+            if dep_job is not None:
+                job["upstream-artifact-task"] = dep_job
+        yield job