1 files changed, 46 insertions, 0 deletions
diff --git a/taskcluster/gecko_taskgraph/transforms/reverse_chunk_deps.py b/taskcluster/gecko_taskgraph/transforms/reverse_chunk_deps.py
new file mode 100644
index 0000000000..f028928e90
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/reverse_chunk_deps.py
@@ -0,0 +1,46 @@
+# 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/.
+"""
+Adjust dependencies to not exceed MAX_DEPENDENCIES
+"""
+
+from copy import deepcopy
+
+from taskgraph.transforms.base import TransformSequence
+from taskgraph.util.treeherder import add_suffix
+
+import gecko_taskgraph.transforms.release_deps as release_deps
+from gecko_taskgraph import MAX_DEPENDENCIES
+
+transforms = TransformSequence()
+
+
+def yield_job(orig_job, deps, count):
+    job = deepcopy(orig_job)
+    job["dependencies"] = deps
+    job["name"] = "{}-{}".format(orig_job["name"], count)
+    if "treeherder" in job:
+        job["treeherder"]["symbol"] = add_suffix(
+            job["treeherder"]["symbol"], f"-{count}"
+        )
+
+    return job
+
+
+@transforms.add
+def add_dependencies(config, jobs):
+    for job in release_deps.add_dependencies(config, jobs):
+        count = 1
+        deps = {}
+
+        # sort for deterministic chunking
+        for dep_label in sorted(job["dependencies"].keys()):
+            deps[dep_label] = dep_label
+            if len(deps) == MAX_DEPENDENCIES:
+                yield yield_job(job, deps, count)
+                deps = {}
+                count += 1
+        if deps:
+            yield yield_job(job, deps, count)
+            count += 1