old_contents: """
  destroy_cached_images.py
  
  This script is used to clean up Glance images that are cached in the SR. By
  default, this script will only cleanup unused cached images.
  
  Options:
  
      --dry_run - Don't actually destroy the VDIs
      --all_cached - Destroy all cached images instead of just unused cached
                     images.
  """
  import eventlet
  eventlet.monkey_patch()
  
  import os
  import sys
  
  # If ../nova/__init__.py exists, add ../ to Python search path, so that
  # it will override what happens to be installed in /usr/(local/)lib/python...
  POSSIBLE_TOPDIR = os.path.normpath(os.path.join(os.path.abspath(sys.argv[0]),
                                     os.pardir,
                                     os.pardir,
                                     os.pardir))
  if os.path.exists(os.path.join(POSSIBLE_TOPDIR, 'nova', '__init__.py')):
      sys.path.insert(0, POSSIBLE_TOPDIR)
  
  from nova import flags
  from nova.openstack.common import cfg
  from nova.openstack.common import log as logging
  from nova import utils
  from nova.virt.xenapi import driver as xenapi_driver
  from nova.virt.xenapi import vm_utils
  
  FLAGS = flags.FLAGS
  destroy_opts = [
      cfg.BoolOpt('all_cached',
                  default=False,
                  help='Destroy all cached images instead of just unused cached'
                       ' images.'),
      cfg.BoolOpt('dry_run',
                  default=False,
                  help='Don\'t actually delete the VDIs.')
  ]
  
  FLAGS.register_cli_opts(destroy_opts)
  
  
  def main():
      flags.parse_args(sys.argv)
      utils.monkey_patch()
  
      xenapi = xenapi_driver.XenAPIDriver()
      session = xenapi._session
  
      sr_ref = vm_utils.safe_find_sr(session)
      destroyed = vm_utils.destroy_cached_images(
              session, sr_ref, all_cached=FLAGS.all_cached,
              dry_run=FLAGS.dry_run)
  
      if '--verbose' in sys.argv:
          print '\n'.join(destroyed)
  
      print "Destroyed %d cached VDIs" % len(destroyed)
  
  
  if __name__ == "__main__":
      main()
  
new_contents: """
  destroy_cached_images.py
  
  This script is used to clean up Glance images that are cached in the SR. By
  default, this script will only cleanup unused cached images.
  
  Options:
  
      --dry_run - Don't actually destroy the VDIs
      --all_cached - Destroy all cached images instead of just unused cached
                     images.
  """
  import eventlet
  eventlet.monkey_patch()
  
  import os
  import sys
  
  # If ../nova/__init__.py exists, add ../ to Python search path, so that
  # it will override what happens to be installed in /usr/(local/)lib/python...
  POSSIBLE_TOPDIR = os.path.normpath(os.path.join(os.path.abspath(sys.argv[0]),
                                     os.pardir,
                                     os.pardir,
                                     os.pardir))
  if os.path.exists(os.path.join(POSSIBLE_TOPDIR, 'nova', '__init__.py')):
      sys.path.insert(0, POSSIBLE_TOPDIR)
  
  from nova import config
  from nova import flags
  from nova.openstack.common import cfg
  from nova.openstack.common import log as logging
  from nova import utils
  from nova.virt.xenapi import driver as xenapi_driver
  from nova.virt.xenapi import vm_utils
  
  FLAGS = flags.FLAGS
  destroy_opts = [
      cfg.BoolOpt('all_cached',
                  default=False,
                  help='Destroy all cached images instead of just unused cached'
                       ' images.'),
      cfg.BoolOpt('dry_run',
                  default=False,
                  help='Don\'t actually delete the VDIs.')
  ]
  
  FLAGS.register_cli_opts(destroy_opts)
  
  
  def main():
      config.parse_args(sys.argv)
      utils.monkey_patch()
  
      xenapi = xenapi_driver.XenAPIDriver()
      session = xenapi._session
  
      sr_ref = vm_utils.safe_find_sr(session)
      destroyed = vm_utils.destroy_cached_images(
              session, sr_ref, all_cached=FLAGS.all_cached,
              dry_run=FLAGS.dry_run)
  
      if '--verbose' in sys.argv:
          print '\n'.join(destroyed)
  
      print "Destroyed %d cached VDIs" % len(destroyed)
  
  
  if __name__ == "__main__":
      main()
  
subject: Move parse_args to nova.config