1 files changed, 33 insertions, 0 deletions
diff --git a/comm/taskcluster/comm_taskgraph/transforms/partials.py b/comm/taskcluster/comm_taskgraph/transforms/partials.py
new file mode 100644
index 0000000000..39d6cf95a7
--- /dev/null
+++ b/comm/taskcluster/comm_taskgraph/transforms/partials.py
@@ -0,0 +1,33 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+Thunderbird modifications to partial update building
+"""
+import logging
+
+from taskgraph.transforms.base import TransformSequence
+
+logger = logging.getLogger(__name__)
+
+transforms = TransformSequence()
+
+
+@transforms.add
+def update_scopes(config, jobs):
+    """
+    Firefox does some caching when building partial updates, but there's no bucket for Thunderbird
+    at the moment. In the meantime, remove the scope from the task to avoid an error.
+    """
+    # If no balrog release history, then don't run
+    if not config.params.get("release_history"):
+        return
+
+    MBSDIFF_SCOPE = "auth:aws-s3:read-write:tc-gp-private-1d-us-east-1/releng/mbsdiff-cache/"
+
+    for job in jobs:
+        task = job["task"]
+        if MBSDIFF_SCOPE in task["scopes"]:
+            task["scopes"].remove(MBSDIFF_SCOPE)
+
+        yield job