1 files changed, 27 insertions, 0 deletions
diff --git a/taskcluster/taskgraph/transforms/repo_update.py b/taskcluster/taskgraph/transforms/repo_update.py
new file mode 100644
index 0000000000..a0000e0c78
--- /dev/null
+++ b/taskcluster/taskgraph/transforms/repo_update.py
@@ -0,0 +1,27 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+Transform the repo-update task into an actual task description.
+"""
+
+from __future__ import absolute_import, print_function, unicode_literals
+
+from taskgraph.transforms.base import TransformSequence
+from taskgraph.util.schema import resolve_keyed_by
+
+transforms = TransformSequence()
+
+
+@transforms.add
+def resolve_keys(config, tasks):
+    for task in tasks:
+        env = task["worker"].setdefault("env", {})
+        env["BRANCH"] = config.params["project"]
+        for envvar in env:
+            resolve_keyed_by(env, envvar, envvar, **config.params)
+
+        for envvar in list(env.keys()):
+            if not env.get(envvar):
+                del env[envvar]
+        yield task