Fix zero-padding in gerrit ref

infra/bots/recipe_modules/core/api.py

 # Copyright 2014 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.
 
 
 # pylint: disable=W0201
 
 
 import json
 import os
@@ skipping 98 matching lines @@
       self.update_repo(self.m.vars.checkout_root, pdfium)
 
     # Run bot_update.
     gclient_cfg.got_revision_mapping['skia'] = 'got_revision'
     checkout_kwargs = {}
     checkout_kwargs['env'] = self.m.vars.default_env
 
     # Hack the patch ref if necessary.
     if self.m.properties.get('patch_storage', '') == 'gerrit':
       if self.m.bot_update._issue and self.m.bot_update._patchset:
-        self.m.bot_update._gerrit_ref = 'refs/changes/%d/%d/%d' % (
-            int(str(self.m.bot_update._issue)[-2:]),
+        self.m.bot_update._gerrit_ref = 'refs/changes/%s/%d/%d' % (
+            str(self.m.bot_update._issue)[-2:],
             self.m.bot_update._issue,
             self.m.bot_update._patchset,
         )
 
     update_step = self.m.bot_update.ensure_checkout(
         gclient_config=gclient_cfg,
         cwd=self.m.vars.checkout_root,
         **checkout_kwargs)
 
     self.m.vars.got_revision = (
         update_step.presentation.properties['got_revision'])
 
     if self.m.vars.need_chromium_checkout:
       self.m.gclient.runhooks(cwd=self.m.vars.checkout_root,
                               env=self.m.vars.gclient_env)