Add apply_gerrit_ref to bot_update api

recipe_modules/bot_update/resources/apply_gerrit.py

Index: recipe_modules/bot_update/resources/apply_gerrit.py
diff --git a/recipe_modules/bot_update/resources/apply_gerrit.py b/recipe_modules/bot_update/resources/apply_gerrit.py
new file mode 100755
index 0000000000000000000000000000000000000000..d91075f1e53d7940441492983c5f0a66e0bc4b6e
--- /dev/null
+++ b/recipe_modules/bot_update/resources/apply_gerrit.py
@@ -0,0 +1,32 @@
+#!/usr/bin/env python
+# Copyright 2016 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.
+
+import optparse

[tandrii(chromium), 2016/08/19 14:00:04]

nitty: argparse is nicer, but don't change now :)

[rmistry, 2016/08/19 14:36:08]

Acknowledged.

+
+import bot_update
+
+
+if __name__ == '__main__':
+  parse = optparse.OptionParser()
+
+  parse.add_option('--gerrit_repo',
+                   help='Gerrit repository to pull the ref from.')
+  parse.add_option('--gerrit_ref', help='Gerrit ref to apply.')
+  parse.add_option('--root', help='The location of the checkout.')
+  parse.add_option('--gerrit_no_reset', action='store_true',
+                   help='Bypass calling reset after applying a gerrit ref.')
+  parse.add_option('--gerrit_rebase_patch_ref', action='store_true',
+                   help='Rebase Gerrit patch ref after of checking it out.')
+
+  options, _ = parse.parse_args()
+
+  sys.exit(
+      bot_update.apply_gerrit_ref(
+          options.gerrit_repo,
+          options.gerrit_ref,
+          options.root,
+          not option.gerrit_no_reset,
+          options.gerrit_rebase_patch_ref)()
+  )