tools/git-sync-deps: handle changing origin

tools/git-sync-deps

 #!/usr/bin/python
 # Copyright 2014 Google Inc.
 #
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 
 """Parse a DEPS file and git checkout all of the dependencies.
 
 Args:
@@ skipping 124 matching lines @@
 
   if 0 == subprocess.call(
       [git, 'checkout', '--quiet', checkoutable], cwd=directory):
     # if this succeeds, skip slow `git fetch`.
     if verbose:
       sys.stdout.write('%s\n  @ %s\n' % (directory, checkoutable))
     return
 
   subprocess.check_call([git, 'fetch', '--quiet'], cwd=directory)
 
-  subprocess.check_call(
-    [git, 'checkout', '--quiet', checkoutable], cwd=directory)
+  if 0 != subprocess.call(
+      [git, 'checkout', '--quiet', checkoutable], cwd=directory):
+      subprocess.check_call([git, 'remote', 'set-url', repo], cwd=directory)
+      subprocess.check_call([git, 'fetch', '--quiet'], cwd=directory)
+      subprocess.check_call([git, 'checkout', '--quiet'], cwd=directory)
 
   if verbose:
     sys.stdout.write('%s\n  @ %s\n' % (directory, checkoutable))  # Success.
 
 
 def parse_file_to_dict(path):
   dictionary = {}
   execfile(path, dictionary)
   return dictionary
 
@@ skipping 60 matching lines @@
   if '--help' in argv or '-h' in argv:
     usage(deps_file_path)
     return 1
 
   git_sync_deps(deps_file_path, argv, verbose)
   return 0
 
 
 if __name__ == '__main__':
   exit(main(sys.argv[1:]))