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..a8a17ec1f6d1ea4a11c293070c4ffed83daaafdc
--- /dev/null
+++ b/recipe_modules/bot_update/resources/apply_gerrit.py
@@ -0,0 +1,33 @@
+#!/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
+import sys
+
+import bot_update

[rmistry, 2016/08/19 18:32:34]

Looks like this is giving a pylint error:

** Presubmit ERRORS **
Pylint (176 files on 4 cores) (19.18s) failed
************* Module bot_update.resources.apply_gerrit
W:  9, 0: Relative import 'bot_update', should be
'bot_update.resources.bot_update' (relative-import)


I tried different things here but they did not work:

from . import bot_update
from bot_update.resources import bot_update
import bot_update.resources.bot_update

Any ideas?

[rmistry, 2016/08/19 18:51:05]

Added disable=relative-import since saw it used in some resources here:
https://cs.chromium.org/chromium/build/scripts/slave/recipe_modules/auto_bise...

Could not find an example in other resources with relative imports. Let me know
what you think.

+
+
+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 options.gerrit_no_reset,
+          options.gerrit_rebase_patch_ref)
+  )