etc/dists/scripts/gentoo-set_hostname.sh

#!/bin/bash
#  Copyright (C) 2000-2006 SWsoft. All rights reserved.
#
#  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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
#
#
# This script sets hostname inside VE for Gentoo like distros
# For usage info see vz-veconfig(5) man page.
#
# Some parameters are passed in environment variables.
# Required parameters:
# Optional parameters:
#   HOSTNM
#       Sets host name for this VE. Modifies /etc/hosts and
#       /etc/sysconfig/network (in RedHat) or /etc/rc.config (in SuSE)

function set_host()
{
	local cfgfile="$1"
	local var=$2
	local val=$3
	local host=

	[ -z "${val}" ] && return 0
        if grep -q -E "[[:space:]]${val}" ${cfgfile} 2>/dev/null; then
                return;
        fi
	if echo "${val}" | grep "\." >/dev/null 2>&1; then
		host=${val%%.*}
	fi
	host=" ${val} ${host}"
	put_param2 "${cfgfile}" "${var}" "${host} localhost localhost.localdomain"
}

function set_hostname()
{
	local cfgfile=$1
	local hostname=$2

	[ -z "${hostname}" ] && return 0
	put_param "${cfgfile}" "HOSTNAME" "${hostname}"
	hostname ${hostname}
}

set_host /etc/hosts "127.0.0.1" "${HOSTNM}"
set_hostname /etc/conf.d/hostname "${HOSTNM}"

exit 0