buildbucket: support unique change urls

scripts/master/master_utils.py

 # Copyright (c) 2012 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 ctypes
 import ctypes.util
 import os
 import random
 import re
 import sys
@@ skipping 487 matching lines @@
           # 'commit-bot@chromium.org', so replace the service account with it.
           name = 'commit-bot@chromium.org'
         properties['requester'] = name
 
   buildbucket.setup(
       c,
       active_master,
       buckets=[active_master.buildbucket_bucket],
       build_params_hook=params_hook,
       max_lease_count=buildbucket.NO_LEASE_LIMIT,
+      unique_change_urls=getattr(
+          active_master, 'buildbucket_unique_change_urls', False),
   )
 
 
 def DumpSetup(c, important=None, filename='config.current.txt'):
   """Writes a flattened version of the setup to a text file.
      Some interesting classes are exploded with their variables
      exposed,  by default the BuildFactories and Schedulers.
      Newlines and indentation are sprinkled through the representation,
      to make the output more easily broken up and groked with grep or diff.
 
@@ skipping 169 matching lines @@
   # Pad the cmdline string to the required length.  If it's longer than the
   # currentl commandline, truncate it.
   if len(cmdline) >= cmdlen:
     new_cmdline = ctypes.c_char_p(cmdline[:cmdlen-1] + '\0')
   else:
     new_cmdline = ctypes.c_char_p(cmdline.ljust(cmdlen, '\0'))
 
   # Replace the old commandline.
   libc = ctypes.CDLL(ctypes.util.find_library('c'))
   libc.memcpy(argv.contents, new_cmdline, cmdlen)