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# Copyright 2014 Red Hat, Inc.
#
# 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 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 program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA
#
# Refer to the README and COPYING files for full details of the license
#

import utils

_hostNameCommandPath = utils.CommandPath("hostname",
                                         "/bin/hostname",
                                         )


class HostNameException(Exception):
    def __init__(self, rc):
        self.rc = rc
        self.message = 'hostname execution failed with error code %s' % self.rc

    def __str__(self):
        return self.message


def getHostNameFqdn():
    rc, out, err = utils.execCmd([_hostNameCommandPath.cmd, '--fqdn'])
    if rc:
        raise HostNameException(rc)
    else:
        return out[0]