Multivm branch: Fetch reference build from archive using git hash, not revision.

dart/tools/bots/get_chromium_build.py

 #!/usr/bin/env python
 #
 # Copyright (c) 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.
 
 """Gets a Chromium archived build, and unpacks it
    into a target directory.
 
   Use -r option to specify the revison number
   Use -t option to specify the directory to unzip the build into.
 
 Usage:
   $ get_chromium_build.py -r <revision> -t <target>
 """
 
+import json
 import logging
 import optparse
 import os
 import platform
 import shutil
 import subprocess
 import sys
 import time
 import urllib
 import urllib2
@@ skipping 15 matching lines @@
       'Windows': {'zipfiles': ['chrome-win32.zip',
                                'chrome-win32-syms.zip'],
                  'folder': 'chrome_win',
                  'archive_path': 'Win'}}
 
   def __init__(self, options):
     platform_data = BuildUpdater._PLATFORM_PATHS_MAP[platform.system()]
     self._zipfiles = platform_data['zipfiles']
     self._folder = platform_data['folder']
     self._archive_path = platform_data['archive_path']
-    self._revision = int(options.revision)
+    self._revision = options.revision
     self._target_dir = options.target_dir
     self._download_dir = os.path.join(self._target_dir, 'downloads')
 
   def _GetBuildUrl(self, revision, filename):
     return CHROMIUM_URL_FMT % (self._archive_path, revision, filename)
 
   def _FindBuildRevision(self, revision, filename):
-    MAX_REVISIONS_PER_BUILD = 100
-    for revision_guess in xrange(revision, revision + MAX_REVISIONS_PER_BUILD):
-      if self._DoesBuildExist(revision_guess, filename):
-        return revision_guess
-      else:
-        time.sleep(.1)
+    git_hash = json.loads(revision)[platform.system()]
+    if self._DoesBuildExist(git_hash, filename):
+      return git_hash
     return None
 
   def _DoesBuildExist(self, revision_guess, filename):
     url = self._GetBuildUrl(revision_guess, filename)
 
     r = urllib2.Request(url)
     r.get_method = lambda: 'HEAD'
     try:
       urllib2.urlopen(r)
       return True
@@ skipping 86 matching lines @@
 
 def main(argv):
   logging.getLogger().setLevel(logging.DEBUG)
   options = ParseOptions(argv)
   b = BuildUpdater(options)
   b.DownloadAndUpdateBuild()
   logging.info('Successfully got archived Chromium build.')
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv))