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/usr/share/dell/bin/recovery-media-backend is in dell-recovery 1.48.

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#!/usr/bin/python3
# -*- coding: utf-8 -*-
#
# «recovery-media-backend» - Dell Recovery D-Bus backend Executable
#
# Copyright (C) 2009, Dell Inc.
#           (C) 2008, Canonical Ltd
#
# Author:
#  - Martin Pitt <martin.pitt@canonical.com>
#  - Mario Limonciello <Mario_Limonciello@Dell.com>
#
# This is free software; you can redistribute it and/or modify it under
# the terms of the GNU General Public License as published by the Free
# Software Foundation; either version 2 of the License, or at your option)
# any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this application; if not, write to the Free Software Foundation, Inc., 51
# Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
##################################################################################


import sys, optparse, logging, gettext

from Dell.recovery_backend import Backend

def parse_argv():
    '''Parse command line arguments, and return (options, args) pair.'''

    parser = optparse.OptionParser()
    parser.add_option ('--debug', action='store_true',
        dest='debug', default=False,
        help='Enable debugging messages.')
    parser.add_option ('-l', '--logfile', type='string', metavar='FILE',
        dest='logfile', default=None,
        help='Write logging messages to a file instead to stderr.')
    parser.add_option ( '--timeout', type='int',
        dest='timeout', metavar='SECS', default=0,
        help='Timeout for D-BUS service (default 0: run forever)')
    (opts, args) = parser.parse_args()
    return (opts, args)

def setup_logging(debug=False, logfile=None):
    '''Setup logging.'''

    logging.raiseExceptions = False
    if debug:
        logging.basicConfig(level=logging.DEBUG, filename=logfile,
            format='%(asctime)s %(levelname)s: %(message)s')
    else:
        logging.basicConfig(level=logging.WARNING, filename=logfile,
            format='%(levelname)s: %(message)s')

def setup_gettext():
    kwargs = {}
    if sys.version < '3':
        kwargs['unicode'] = True
    gettext.install('dell-recovery', **kwargs)

setup_gettext()
argv_options, argv_args = parse_argv()
setup_logging(argv_options.debug, argv_options.logfile)


svr = Backend.create_dbus_server()
if not svr:
    logging.error("Error spawning DBUS server")
    sys.exit(10)
if argv_options.timeout == 0:
    svr.run_dbus_service()
else:
    svr.run_dbus_service(argv_options.timeout)