Bug 1543893 - Set TASKCLUSTER_ROOT_URL on workers that don't set it. r=tomprince

Differential Revision: https://phabricator.services.mozilla.com/D39151

--HG--
extra : moz-landing-system : lando

taskcluster/taskgraph/transforms/task.py

@@ -22,6 +22,7 @@ import attr
 from mozbuild.util import memoize
 from taskgraph.util.attributes import TRUNK_PROJECTS
 from taskgraph.util.hash import hash_path
+from taskgraph.util.taskcluster import get_root_url
 from taskgraph.util.treeherder import split_symbol
 from taskgraph.transforms.base import TransformSequence
 from taskgraph.util.keyed_by import evaluate_keyed_by
@@ -1877,6 +1878,10 @@ def build_task(config, tasks):
                 env = payload.setdefault('env', {})
                 env['MOZ_AUTOMATION'] = '1'
 
+                # Set TASKCLUSTER_ROOT_URL on workers that don't set it
+                if provisioner_id == 'terraform-packet':
+                    env['TASKCLUSTER_ROOT_URL'] = get_root_url(False)
+
         yield {
             'label': task['label'],
             'task': task_def,