Bug 1342392 Migrate partial update generation in-tree r=rail

MozReview-Commit-ID: 84fP48sMYhS

taskcluster/taskgraph/util/taskcluster.py

@@ -13,6 +13,9 @@ from mozbuild.util import memoize
 from requests.packages.urllib3.util.retry import Retry
 from requests.adapters import HTTPAdapter
 
+_TC_ARTIFACT_LOCATION = \
+        'https://queue.taskcluster.net/v1/task/{task_id}/artifacts/public/build/{postfix}'
+
 
 @memoize
 def get_session():
@@ -101,3 +104,10 @@ def get_task_url(task_id, use_proxy=False):
 def get_task_definition(task_id, use_proxy=False):
     response = _do_request(get_task_url(task_id, use_proxy))
     return response.json()
+
+
+def get_taskcluster_artifact_prefix(task_id, postfix='', locale=None):
+    if locale:
+        postfix = '{}/{}'.format(locale, postfix)
+
+    return _TC_ARTIFACT_LOCATION.format(task_id=task_id, postfix=postfix)