bisect-builds.py: Correct method to convert SVN revision to Git hash.

tools/bisect-builds.py

 #!/usr/bin/env python
 # 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.
 
 """Snapshot Build Bisect Tool
 
 This script bisects a snapshot archive using binary search. It starts at
 a bad revision (it will try to guess HEAD) and asks for a last known-good
 revision. It will then binary search across this revision range by downloading,
@@ skipping 15 matching lines @@
 # Base URL for downloading official builds.
 GOOGLE_APIS_URL = 'commondatastorage.googleapis.com'
 
 # The base URL for official builds.
 OFFICIAL_BASE_URL = 'http://%s/%s' % (GOOGLE_APIS_URL, GS_BUCKET_NAME)
 
 # URL template for viewing changelogs between revisions.
 CHANGELOG_URL = ('https://chromium.googlesource.com/chromium/src/+log/%s..%s')
 
 # URL to convert SVN revision to git hash.
-CRREV_URL = ('http://crrev.com/')
-
-# Search pattern to match git hash.
-GITHASH_SEARCH_PATTERN = (r'<title>(\w+)\s')
+CRREV_URL = ('https://cr-rev.appspot.com/_ah/api/crrev/v1/redirect/')
 
 # URL template for viewing changelogs between official versions.
 OFFICIAL_CHANGELOG_URL = ('https://chromium.googlesource.com/chromium/'
                           'src/+log/%s..%s?pretty=full')
 
 # DEPS file URL.
 DEPS_FILE = 'http://src.chromium.org/viewvc/chrome/trunk/src/DEPS?revision=%d'
 
 # Blink changelogs URL.
 BLINK_CHANGELOG_URL = ('http://build.chromium.org'
@@ skipping 898 matching lines @@
     print 'Could not determine latest revision. This could be bad...'
     return 999999999
 
 def PrintChangeLog(min_chromium_rev, max_chromium_rev):
   """Prints the changelog URL."""
 
   def _GetGitHashFromSVNRevision(svn_revision):
     crrev_url = CRREV_URL + str(svn_revision)
     url = urllib.urlopen(crrev_url)
     if url.getcode() == 200:
-      result = re.search(GITHASH_SEARCH_PATTERN, url.read())
-      return result.group(1)
+      data = json.loads(url.read())
+      if 'git_sha' in data:
+        return data['git_sha']
 
   print ('  ' + CHANGELOG_URL % (_GetGitHashFromSVNRevision(min_chromium_rev),
          _GetGitHashFromSVNRevision(max_chromium_rev)))
 
 
 def main():
   usage = ('%prog [options] [-- chromium-options]\n'
            'Perform binary search on the snapshot builds to find a minimal\n'
            'range of revisions where a behavior change happened. The\n'
            'behaviors are described as "good" and "bad".\n'
@@ skipping 192 matching lines @@
 
     print 'CHANGELOG URL:'
     if opts.official_builds:
       print OFFICIAL_CHANGELOG_URL % (min_chromium_rev, max_chromium_rev)
     else:
       PrintChangeLog(min_chromium_rev, max_chromium_rev)
 
 
 if __name__ == '__main__':
   sys.exit(main())