Fix setting the executable bit in download_from_google_storage.

download_from_google_storage.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.
 
 """Download files from Google Storage based on SHA1 sums."""
 
 
 import hashlib
 import optparse
@@ skipping 230 matching lines @@
     if sys.platform == 'cygwin':
       # Under cygwin, mark all files as executable. The executable flag in
       # Google Storage will not be set when uploading from Windows, so if
       # this script is running under cygwin and we're downloading an
       # executable, it will be unrunnable from inside cygwin without this.
       st = os.stat(output_filename)
       os.chmod(output_filename, st.st_mode | stat.S_IEXEC)
     elif sys.platform != 'win32':
       # On non-Windows platforms, key off of the custom header
       # "x-goog-meta-executable".
-      #
-      # TODO(hinoka): It is supposedly faster to use "gsutil stat" but that
-      # doesn't appear to be supported by the gsutil currently in our tree. When
-      # we update, this code should use that instead of "gsutil ls -L".
-      code, out, _ = gsutil.check_call('ls', '-L', file_url)
+      code, out, _ = gsutil.check_call('stat', file_url)
       if code != 0:
         out_q.put('%d> %s' % (thread_num, err))
         ret_codes.put((code, err))
-      elif re.search('x-goog-meta-executable:', out):
+      elif re.search(r'executable:\s*1', out):
         st = os.stat(output_filename)
         os.chmod(output_filename, st.st_mode | stat.S_IEXEC)
 
 def printer_worker(output_queue):
   while True:
     line = output_queue.get()
     # Its plausible we want to print empty lines.
     if line is None:
       break
     print line
@@ skipping 184 matching lines @@
       return code
 
   return download_from_google_storage(
       input_filename, base_url, gsutil, options.num_threads, options.directory,
       options.recursive, options.force, options.output, options.ignore_errors,
       options.sha1_file, options.verbose, options.auto_platform)
 
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv))