Don't allow hardlinks in tarball.

cros_generate_stateful_update_payload.py

 #!/usr/bin/python2.6
 
 # Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """This module is responsible for generate a stateful update payload."""
 
 import logging
 import optparse
@@ skipping 32 matching lines @@
                              '--read_only',
                              '--rootfs_mountpt=%s' % rootfs_dir,
                              '--stateful_mountpt=%s' % stateful_dir,
                             ])
       logger.info('Tarring up /usr/local and /var!')
       subprocess.check_call(['sudo',
                              'tar',
                              '-czf',
                              output_gz,
                              '--directory=%s' % stateful_dir,
+                             '--hard-dereference',
                              '--transform=s,^dev_image,dev_image_new,',
                              '--transform=s,^var,var_new,',
                              'dev_image',
                              'var',
                             ])
     except:
       logger.error('Failed to create stateful update file')
       raise
     finally:
       # Unmount best effort regardless.
@@ skipping 22 matching lines @@
     parser.error('Missing image for stateful payload generator')
   if not options.output_dir:
     parser.error('Missing output directory for the payload generator')
 
   GenerateStatefulPayload(os.path.abspath(options.image_path),
                           options.output_dir, logger)
 
 
 if __name__ == '__main__':
   main()