[WPT export] Add Change-Id back if missing

Change-Id can be accidentally deleted from an in-flight CL *, in which
case we need to add it back so that the exporter can find the export PR
later.

* https://crbug.com/gerrit/12244

Bug: 1032044
Change-Id: I9796e4a1e13dc8e2f617d9e45e7d2cb1a4ee61f2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2065132
Auto-Submit: Robert Ma <robertma@chromium.org>
Commit-Queue: Philip Jägenstedt <foolip@chromium.org>
Reviewed-by: Philip Jägenstedt <foolip@chromium.org>
Cr-Commit-Position: refs/heads/master@{#743905}

third_party/blink/tools/blinkpy/w3c/chromium_commit_mock.py

@@ -44,6 +44,8 @@ class MockChromiumCommit(object):
 
     def body(self):
         # The final newline is intentionally added to match the real behavior.
+        if not self.change_id():
+            return self._body + '\n'
         return self._body + '\n\nChange-Id: ' + self.change_id() + '\n'
 
     def message(self):

third_party/blink/tools/blinkpy/w3c/common.py

@@ -15,7 +15,8 @@ WPT_GH_REPO_NAME = 'wpt'
 WPT_GH_URL = 'https://github.com/%s/%s/' % (WPT_GH_ORG, WPT_GH_REPO_NAME)
 WPT_MIRROR_URL = 'https://chromium.googlesource.com/external/github.com/web-platform-tests/wpt.git'
 WPT_GH_SSH_URL_TEMPLATE = 'https://{}@github.com/%s/%s.git' % (WPT_GH_ORG, WPT_GH_REPO_NAME)
-WPT_REVISION_FOOTER = 'WPT-Export-Revision:'
+WPT_REVISION_FOOTER = 'WPT-Export-Revision: '
+CHANGE_ID_FOOTER = 'Change-Id: '
 EXPORT_PR_LABEL = 'chromium-export'
 PROVISIONAL_PR_LABEL = 'do not merge yet'
 

third_party/blink/tools/blinkpy/w3c/export_notifier.py

@@ -65,8 +65,7 @@ class ExportNotifier(object):
                     'Can not retrieve Change-Id for %s.', pr.number)
                 continue
 
-            gerrit_sha = self.wpt_github.extract_metadata(
-                WPT_REVISION_FOOTER + ' ', pr.body)
+            gerrit_sha = self.wpt_github.extract_metadata(WPT_REVISION_FOOTER, pr.body)
             gerrit_dict[gerrit_id] = PRStatusInfo(
                 taskcluster_status['node_id'],
                 taskcluster_status['target_url'],

third_party/blink/tools/blinkpy/w3c/test_exporter.py

@@ -11,11 +11,12 @@ from blinkpy.common.system.log_utils import configure_logging
 from blinkpy.w3c.local_wpt import LocalWPT
 from blinkpy.w3c.chromium_exportable_commits import exportable_commits_over_last_n_commits
 from blinkpy.w3c.common import (
+    CHANGE_ID_FOOTER,
     WPT_GH_URL,
     WPT_REVISION_FOOTER,
     EXPORT_PR_LABEL,
     PROVISIONAL_PR_LABEL,
-    read_credentials
+    read_credentials,
 )
 from blinkpy.w3c.gerrit import GerritAPI, GerritCL, GerritError
 from blinkpy.w3c.wpt_github import WPTGitHub, MergeError
@@ -135,7 +136,7 @@ class TestExporter(object):
             pr_url = '{}pull/{}'.format(WPT_GH_URL, pull_request.number)
             _log.info('In-flight PR found: %s', pr_url)
 
-            pr_cl_revision = self.wpt_github.extract_metadata(WPT_REVISION_FOOTER + ' ', pull_request.body)
+            pr_cl_revision = self.wpt_github.extract_metadata(WPT_REVISION_FOOTER, pull_request.body)
             if cl.current_revision_sha == pr_cl_revision:
                 _log.info('PR revision matches CL revision. Nothing to do here.')
                 return
@@ -214,7 +215,7 @@ class TestExporter(object):
 
         try:
             self.wpt_github.merge_pr(pull_request.number)
-            change_id = self.wpt_github.extract_metadata('Change-Id: ', pull_request.body)
+            change_id = self.wpt_github.extract_metadata(CHANGE_ID_FOOTER, pull_request.body)
             if change_id:
                 cl = GerritCL(data={'change_id': change_id}, api=self.gerrit)
                 pr_url = '{}pull/{}'.format(WPT_GH_URL, pull_request.number)
@@ -261,11 +262,18 @@ class TestExporter(object):
             _log.debug('END_OF_PATCH_EXCERPT')
             return
 
+        footer = ''
+        # Change-Id can be deleted from the body of an in-flight CL in Chromium
+        # (https://crbug.com/gerrit/12244). We need to add it back. And we've
+        # asserted that cl.change_id is present in GerritCL.
+        if not self.wpt_github.extract_metadata(CHANGE_ID_FOOTER, commit.message()):
+            _log.warn('Adding missing Change-Id back to %s', cl.url)
+            footer += '{}{}\n'.format(CHANGE_ID_FOOTER, cl.change_id)
         # Reviewed-on footer is not in the git commit message of in-flight CLs,
         # but a link to code review is useful so we add it manually.
-        footer = 'Reviewed-on: {}\n'.format(cl.url)
+        footer += 'Reviewed-on: {}\n'.format(cl.url)
         # WPT_REVISION_FOOTER is used by the exporter to check the CL revision.
-        footer += '{} {}'.format(WPT_REVISION_FOOTER, cl.current_revision_sha)
+        footer += '{}{}'.format(WPT_REVISION_FOOTER, cl.current_revision_sha)
 
         if pull_request:
             pr_number = self.create_or_update_pr_from_commit(

third_party/blink/tools/blinkpy/w3c/test_exporter_unittest.py

@@ -197,22 +197,44 @@ class TestExporterTest(LoggingTestCase):
         test_exporter.wpt_github = MockWPTGitHub(pull_requests=[])
         test_exporter.get_exportable_commits = lambda: ([], [])
         test_exporter.gerrit = MockGerritAPI()
-        test_exporter.gerrit.exportable_open_cls = [MockGerritCL(
-            data={
-                'change_id': 'I001',
-                'subject': 'subject',
-                '_number': 1234,
-                'current_revision': '1',
-                'has_review_started': True,
-                'revisions': {
-                    '1': {'commit_with_footers': 'a commit with footers'}
+        test_exporter.gerrit.exportable_open_cls = [
+            MockGerritCL(
+                data={
+                    'change_id': 'I001',
+                    'subject': 'subject',
+                    '_number': 1234,
+                    'current_revision': '1',
+                    'has_review_started': True,
+                    'revisions': {
+                        '1': {
+                            'commit_with_footers': 'a commit with footers'
+                        }
+                    },
+                    'owner': {
+                        'email': 'test@chromium.org'
+                    },
                 },
-                'owner': {'email': 'test@chromium.org'},
-            },
-            api=test_exporter.gerrit,
-            chromium_commit=MockChromiumCommit(self.host, subject='subject',
-                                               body='fake body <faketag1>, <faketag2>', change_id='I001')
-        )]
+                api=test_exporter.gerrit,
+                chromium_commit=MockChromiumCommit(self.host, subject='subject', body='fake body <html>', change_id='I001')),
+            MockGerritCL(
+                data={
+                    'change_id': 'I002',
+                    'subject': 'subject',
+                    '_number': 1235,
+                    'current_revision': '1',
+                    'has_review_started': True,
+                    'revisions': {
+                        '1': {
+                            'commit_with_footers': 'a commit with footers'
+                        }
+                    },
+                    'owner': {
+                        'email': 'test@chromium.org'
+                    },
+                },
+                api=test_exporter.gerrit,
+                chromium_commit=MockChromiumCommit(self.host, subject='subject', body='body', change_id=None)),
+        ]
         test_exporter.main(['--credentials-json', '/tmp/credentials.json'])
 
         self.assertEqual(test_exporter.wpt_github.calls, [
@@ -220,12 +242,18 @@ class TestExporterTest(LoggingTestCase):
             'create_pr',
             'add_label "chromium-export"',
             'add_label "do not merge yet"',
+            'pr_with_change_id',
+            'create_pr',
+            'add_label "chromium-export"',
+            'add_label "do not merge yet"',
         ])
         self.assertEqual(test_exporter.wpt_github.pull_requests_created, [
-            ('chromium-export-cl-1234',
-             'subject',
-             'fake body \\<faketag1>, \\<faketag2>\n\nChange-Id: I001\nReviewed-on: '
-             'https://chromium-review.googlesource.com/1234\nWPT-Export-Revision: 1'),
+            ('chromium-export-cl-1234', 'subject', 'fake body \\<html>\n\nChange-Id: I001\nReviewed-on: '
+             'https://chromium-review.googlesource.com/1234\n'
+             'WPT-Export-Revision: 1'),
+            ('chromium-export-cl-1235', 'subject', 'body\nChange-Id: I002\nReviewed-on: '
+             'https://chromium-review.googlesource.com/1235\n'
+             'WPT-Export-Revision: 1'),
         ])
         self.assertEqual(test_exporter.wpt_github.pull_requests_merged, [])