[Chromecast] Require chromecast OWNERS to be aware of locale changes.

chromecast/app/verify_cast_locales.py

Index: chromecast/app/verify_cast_locales.py
diff --git a/chromecast/app/verify_cast_locales.py b/chromecast/app/verify_cast_locales.py
new file mode 100755
index 0000000000000000000000000000000000000000..ff607ea33a143772fe22747ecaad09811f54f7a9
--- /dev/null
+++ b/chromecast/app/verify_cast_locales.py
@@ -0,0 +1,59 @@
+#!/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.
+
+"""Ensures that Chromecast developers are notified of locale changes."""
+
+import argparse
+import sys
+
+CAST_LOCALES = [
+    'am', 'ar', 'bg', 'bn', 'ca', 'cs', 'da', 'de', 'el', 'en-GB', 'en-US',
+    'es-419', 'es', 'et', 'fa', 'fake-bidi', 'fi', 'fil', 'fr', 'gu', 'he',
+    'hi', 'hr', 'hu', 'id', 'it', 'ja', 'kn', 'ko', 'lt', 'lv', 'ml', 'mr',
+    'ms', 'nb', 'nl', 'pl', 'pt-BR', 'pt-PT', 'ro', 'ru', 'sk', 'sl', 'sr',
+    'sv', 'sw', 'ta', 'te', 'th', 'tr', 'uk', 'vi', 'zh-CN', 'zh-TW'
+]
+
+SUCCESS_RETURN_CODE = 0
+FAILURE_RETURN_CODE = 1
+
+
+# Chromecast OWNERS need to know if the list of locales used in
+# //build/config/locales.gni changes, so that the Chromecast build process
+# can be updated accordingly when it does.
+#
+# This script runs a check to verify that the list of locales maintained in GN
+# matches CAST_LOCALES above. If a CL changes that list, it must also change
+# CAST_LOCALES in this file to make the Cast trybot pass. This change will
+# require adding a //chromecast OWNER to the change, keeping the team aware of
+# any locale changes.
+def main():
+  parser = argparse.ArgumentParser()
+  parser.add_argument('locales', type=str, nargs='+',
+                      help='Locales from the GN locale list')
+  parser.add_argument('--stamp-file', '-s', type=str, required=True,
+                      help='The script will stamp this file if successful.')
+  args = parser.parse_args()
+
+  if set(CAST_LOCALES) == set(args.locales):
+    open(args.stamp_file, 'w')
+    return SUCCESS_RETURN_CODE
+
+  # The lists do not match. Compute the difference and log it to the developer.
+  removed_locales = set(CAST_LOCALES) - set(args.locales)
+  added_locales = set(args.locales) - set(CAST_LOCALES)
+
+  print 'CAST_LOCALES no longer matches the locales list from GN!'
+  if removed_locales:
+    print 'These locales have been removed: {}'.format(list(removed_locales))
+  if added_locales:
+    print 'These locales have been added: {}'.format(list(added_locales))
+  print ('Please update CAST_LOCALES in {file} and add a reviewer from '
+         '//chromecast/OWNERS to your CL. ').format(file=__file__)
+  return FAILURE_RETURN_CODE
+
+
+if __name__ == '__main__':
+  sys.exit(main())