devserver: start using payload scripts bundled with devserver

host/cros_generate_stateful_update_payload

 #!/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
 import os
 import subprocess
 import tempfile
 
 STATEFUL_FILE = 'stateful.tgz'
 
 
 def GenerateStatefulPayload(image_path, output_directory, logger):
     """Generates a stateful update payload given a full path to an image.
 
     Args:
       image_path: Full path to the image.
       output_directory: Path to the directory to leave the resulting output.
       logger: logging instance.
     """
     logger.info('Generating stateful update file.')
     from_dir = os.path.dirname(image_path)
     image = os.path.basename(image_path)
     output_gz = os.path.join(output_directory, STATEFUL_FILE)
-    crosutils_dir = os.path.dirname(__file__)
+    # TODO(zbehan): This is only used for mount_gpt_image.sh. That script also
+    # needs to move away from src/scripts.
+    crosutils_dir = '%s/src/scripts' % os.environ['CROS_WORKON_SRCROOT']
 
     # Temporary directories for this function.
     rootfs_dir = tempfile.mkdtemp(suffix='rootfs', prefix='tmp')
     stateful_dir = tempfile.mkdtemp(suffix='stateful', prefix='tmp')
 
     # Mount the image to pull out the important directories.
     try:
       # Only need stateful partition, but this saves us having to manage our
       # own loopback device.
       subprocess.check_call(['%s/mount_gpt_image.sh' % crosutils_dir,
@@ skipping 45 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()