Bug 1827709: Notify Thunderbird CI Matrix channel after mozilla-central push. r=releng-reviewers,gabriel

This notification will help Thunderbird developers who are tasked with pushing
multiple bugs to comm-central after a mozilla-central push.

Taskgraph tests adjusted to verify the notification is only sent for pushes
to mozilla-central, and to run the tests when .taskcluster.yml is updated.

Differential Revision: https://phabricator.services.mozilla.com/D175290

.taskcluster.yml

@@ -131,7 +131,11 @@ tasks:
                             # Send a notification email if the push comes from try
                             - $if: 'repository.project == "try"'
                               then:
-                                  "notify.email.${ownerEmail}.on-completed"
+                                  - "notify.email.${ownerEmail}.on-completed"
+                            - $if: 'repository.project == "mozilla-central"'
+                              then:
+                                  # Notify #thunderbird-ci
+                                  - "notify.matrix-room.!TWztIhgqLawNpRBZTC:mozilla.org.on-completed"
                         else:
                             $if: 'tasks_for == "action"'
                             then:
@@ -310,13 +314,16 @@ tasks:
                       - $if: 'tasks_for == "hg-push"'
                         then:
                             notify:
-                                email:
+                                $merge:
-                                    $merge:
+                                    - email:
-                                        - link:
+                                          $merge:
-                                              text: "Treeherder Jobs"
+                                              - link:
-                                              href: "https://treeherder.mozilla.org/#/jobs?repo=${repository.project}&revision=${push.revision}"
+                                                    text: "Treeherder Jobs"
-                                        # Email for try pushes should thank you for your revision
+                                                    href: "https://treeherder.mozilla.org/#/jobs?repo=${repository.project}&revision=${push.revision}"
-                                        - $if: 'repository.project == "try"'
+                                              - $if: 'repository.project == "try"'
-                                          then:
+                                                then:
-                                              subject: "Thank you for your try submission of ${push.revision}. It's the best!"
+                                                    subject: "Thank you for your try submission of ${push.revision}. It's the best!"
-                                              content: "Your try push has been submitted. It's the best! Use the link to view the status of your jobs."
+                                                    content: "Your try push has been submitted. It's the best! Use the link to view the status of your jobs."
+                                    - $if: 'repository.project == "mozilla-central"'
+                                      then:
+                                          matrixBody: "${repository.project} push notification: https://treeherder.mozilla.org/#/jobs?repo=${repository.project}&revision=${push.revision}"

taskcluster/ci/source-test/python.yml

@@ -45,6 +45,7 @@ firefox-ci:
         subsuite: ci
     when:
         files-changed:
+            - '.taskcluster.yml'
             - 'taskcluster/ci/**'
             - 'taskcluster/**/*.py'
             - 'tools/tryselect/selectors/auto.py'

taskcluster/gecko_taskgraph/test/test_taskcluster_yml.py

@@ -41,6 +41,31 @@ class TestTaskclusterYml(unittest.TestCase):
         self.assertEqual(
             rendered["tasks"][0]["metadata"]["name"], "Gecko Decision Task"
         )
+        self.assertIn("matrixBody", rendered["tasks"][0]["extra"]["notify"])
+
+    def test_push_non_mc(self):
+        context = {
+            "tasks_for": "hg-push",
+            "push": {
+                "revision": "e8d2d9aff5026ef1f1777b781b47fdcbdb9d8f20",
+                "base_revision": "e8aebe488b2f2e567940577de25013d00e818f7c",
+                "owner": "dustin@mozilla.com",
+                "pushlog_id": 1556565286,
+                "pushdate": 112957,
+            },
+            "repository": {
+                "url": "https://hg.mozilla.org/releases/mozilla-beta",
+                "project": "mozilla-beta",
+                "level": "3",
+            },
+            "ownTaskId": slugid.nice(),
+        }
+        rendered = jsone.render(self.taskcluster_yml, context)
+        pprint.pprint(rendered)
+        self.assertEqual(
+            rendered["tasks"][0]["metadata"]["name"], "Gecko Decision Task"
+        )
+        self.assertNotIn("matrixBody", rendered["tasks"][0]["extra"]["notify"])
 
     def test_cron(self):
         context = {