bug 1269355 - Enable sccache for taskcluster linux32/64 builds. r=dustin,gps

MozReview-Commit-ID: LGqpNDb7uHN

taskcluster/taskgraph/transforms/task.py

@@ -140,6 +140,9 @@ task_description_schema = Schema({
     #  {level} -- the scm level of this push
     'worker-type': basestring,
 
+    # Whether the job should use sccache compiler caching.
+    Required('needs-sccache', default=False): bool,
+
     # information specific to the worker implementation that will run this task
     'worker': Any({
         Required('implementation'): Any('docker-worker', 'docker-engine'),
@@ -370,6 +373,14 @@ def build_docker_worker_payload(config, task, task_def):
     if worker.get('chain-of-trust'):
         features['chainOfTrust'] = True
 
+    if task.get('needs-sccache'):
+        features['taskclusterProxy'] = True
+        task_def['scopes'].append(
+            'assume:project:taskcluster:level-{level}-sccache-buckets'.format(
+                level=config.params['level'])
+        )
+        worker['env']['USE_SCCACHE'] = '1'
+
     capabilities = {}
 
     for lo in 'audio', 'video':
@@ -451,6 +462,8 @@ def build_generic_worker_payload(config, task, task_def):
         'osGroups': worker.get('os-groups', []),
     }
 
+    # needs-sccache is handled in mozharness_on_windows
+
     if 'retry-exit-status' in worker:
         raise Exception("retry-exit-status not supported in generic-worker")
 
@@ -472,6 +485,8 @@ def build_macosx_engine_payload(config, task, task_def):
         'artifacts': artifacts,
     }
 
+    if task.get('needs-sccache'):
+        raise Exception('needs-sccache not supported in macosx-engine')
 
 @payload_builder('buildbot-bridge')
 def build_buildbot_bridge_payload(config, task, task_def):