# -*- coding: utf-8 -*-

# Copyright (C) 2011-2013 Avencall
#
# This program 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 3 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 program.  If not, see <http://www.gnu.org/licenses/>

import subprocess
from xivo.http_json_server import register, CMD_R, HttpReqError

DHCPD_UDPATE_COMMAND = ['dhcpd-update', '-dr']


def dhcpd_update(args, options):
    """Download the latest ISC dhcp server configuration files and
    regenerate the affected configuration files via the dhcpd-update
    command.

    """
    try:
        returncode = subprocess.call(DHCPD_UDPATE_COMMAND, close_fds=True)
    except OSError as e:
        raise HttpReqError(500, "error while executing dhcpd-update command", e)
    else:
        if returncode:
            raise HttpReqError(500, "dhcpd-update command returned %s" % returncode)
        else:
            return True


register(dhcpd_update, CMD_R, name='dhcpd_update')
