[DO NOT LAND] Add some scripts to diagnose impact of crbug.com/684270.

tools/rietveld_missing_owners.py

Index: tools/rietveld_missing_owners.py
diff --git a/tools/rietveld_missing_owners.py b/tools/rietveld_missing_owners.py
new file mode 100755
index 0000000000000000000000000000000000000000..06dcb57e8dfc982159afd572973e36cfae2eaf9c
--- /dev/null
+++ b/tools/rietveld_missing_owners.py
@@ -0,0 +1,121 @@
+#!/usr/bin/env python
+# Copyright 2017 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+from __future__ import print_function
+
+
+import argparse
+import json
+import os
+import subprocess
+import string
+import sys
+import urllib2
+
+sys.path.append('/usr/local/google/home/wez/Projects/depot_tools')
+from owners import Database as OwnersDatabase
+
+def main(argv):
+  parser = argparse.ArgumentParser()
+  parser.add_argument('revisions', action='store')
+  args = parser.parse_args(argv)
+
+  owners = OwnersDatabase('/usr/local/google/home/wez/Projects/git-chrome/src', open, os.path)
+
+  try:
+    affected_revisions = git_log(args.revisions)
+    print("There are %d affected revisions." % len(affected_revisions))
+
+    affected_cls = cls_and_files_from_revisions(affected_revisions)
+    print("There are %d potentially affected CLs." % len(affected_cls))
+    for cl, files in affected_cls:
+      issue = rietveld_props_for_issue(cl)
+      approvers = rietveld_approvers(issue) + [issue['owner_email']]
+      missed_files = owners.files_not_covered_by(files, approvers)
+      if missed_files:
+        print('http://codereview.chromium.org/%d (missed:%s)' % (cl, missed_files))
+
+  except Exception as e:
+    print('Exception raised: %s' % str(e), file=sys.stderr)
+    return 1
+
+
+def git(args):
+  command = subprocess.Popen(['/usr/bin/git'] + args, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+  output = command.stdout.readlines()
+  if command.stderr.read():
+    raise Exception("git failed: (" + repr(args) + ")")
+  return output
+
+
+def git_show_raw(revision):
+  return git(['show', '--name-only', revision])
+
+
+def cls_and_files_from_revisions(affected_revisions):
+  cls = []
+  for revision in affected_revisions:
+    revision_cl = None
+    lines = git_show_raw(revision)
+    is_bot = False
+    while lines and lines[0].rstrip() and lines[0][0] not in string.whitespace:
+      line, lines = lines[0].strip(), lines[1:]
+      if line in ['Author: chrome-cron <chrome-cron@google.com>',
+                  'Author: chromeos-commit-bot <chromeos-commit-bot@chromium.org>']:
+        is_bot = True
+        break
+    if is_bot:
+      continue
+    is_xtb_update = False
+    while lines and lines[0] and lines[0][0] in string.whitespace:
+      line, lines = lines[0].strip(), lines[1:]
+      if line == 'Updating XTBs based on .GRDs from branch master':
+        is_xtb_update = True
+        break
+      if line[:11] == 'Review-Url:':
+        cl_url_parts = line[11:].strip().split('/')
+        if cl_url_parts[0] != 'https:' or cl_url_parts[1] != '':
+          raise Exception("Strange CL URL format: " + repr(cl_url_parts))
+        new_revision_cl = int(cl_url_parts[3].split()[0])
+        if revision_cl and revision_cl != new_revision_cl:
+          print("WARNING: Multiple CLs?!? (%s has: %d vs %d)" % (revision, revision_cl, new_revision_cl))
+        revision_cl = new_revision_cl
+    if is_xtb_update:
+      continue
+    if not revision_cl:
+      if revision in ['957e153e766373fd1589dfaf2a07cf1929de6463']:
+        continue
+      raise Exception("Missing CL revision: git %s" % revision)
+    files = map(string.strip, lines)
+    cls.append((revision_cl, files))
+  return cls
+
+
+def git_log(revisions):
+  return map(lambda x: x.split()[0],
+             git(['log', '--format=oneline', revisions]))
+
+
+def rietveld_props_for_issue(issue):
+  """Returns a dictionary of properties, including messages, for the issue."""
+
+  url = 'https://codereview.chromium.org/api/%d?messages=true' % issue
+  fp = None
+  try:
+    fp = urllib2.urlopen(url)
+    return json.load(fp)
+  finally:
+    if fp:
+      fp.close()
+
+
+def rietveld_approvers(props):
+  """Returns a sorted list of the approvers, from an issue's props."""
+  messages = props.get('messages', [])
+  return sorted(set(m['sender'] for m in messages if m.get('approval')))
+
+
+if __name__ == '__main__':
+  sys.exit(main(sys.argv[1:]))