Add automatic retry of cab extraction.

build/extract_from_cab.py

 #!/usr/bin/env python
 # Copyright (c) 2011 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.
 
 """Extracts a single file from a CAB archive."""
 
 import os
 import subprocess
 import sys
 
 
 def main():
   if len(sys.argv) != 4:
     print 'Usage: extract_from_cab.py cab_path archived_file output_dir'
     return 1
 
   [cab_path, archived_file, output_dir] = sys.argv[1:]
 
   # Invoke the Windows expand utility to extract the file.
   level = subprocess.call(
       ['expand', cab_path, '-F:' + archived_file, output_dir])
   if level != 0:
-    return level
+    print 'Cab extraction(%s, %s, %s) failed.' % (
+        cab_path, archived_file, output_dir)
+    print 'Trying a second time.'
+    level = subprocess.call(
+        ['expand', cab_path, '-F:' + archived_file, output_dir])
+    if level != 0:
+      return level
 
   # The expand utility preserves the modification date and time of the archived
   # file. Touch the extracted file. This helps build systems that compare the
   # modification times of input and output files to determine whether to do an
   # action.
   os.utime(os.path.join(output_dir, archived_file), None)
   return 0
 
 
 if __name__ == '__main__':
   sys.exit(main())