Bug 1436977 Disable partials diff caching for macosx r=rail

MozReview-Commit-ID: i1oe7foWam

--HG--
extra : rebase_source : eacbf3c070444302ab441d36a79e721327802453

taskcluster/taskgraph/transforms/partials.py

@@ -147,8 +147,7 @@ def make_task_description(config, jobs):
             'worker-type': 'aws-provisioner-v1/gecko-%s-b-linux' % level,
             'dependencies': dependencies,
             'scopes': [
-                'secrets:get:project/releng/gecko/build/level-%s/datadog-api-key' % level,
-                'auth:aws-s3:read-write:tc-gp-private-1d-us-east-1/releng/mbsdiff-cache/'
+                'secrets:get:project/releng/gecko/build/level-%s/datadog-api-key' % level
             ],
             'attributes': attributes,
             'run-on-projects': dep_job.attributes.get('run_on_projects'),
@@ -157,4 +156,9 @@ def make_task_description(config, jobs):
             'worker': worker,
         }
 
+        # We only want caching on linux/windows due to bug 1436977
+        if any([platform in dep_th_platform for platform in ['linux', 'windows']]):
+            task['scopes'].append(
+                'auth:aws-s3:read-write:tc-gp-private-1d-us-east-1/releng/mbsdiff-cache/')
+
         yield task