openrc/init.d/hostid.in

#!@PREFIX@/sbin/runscript
# Copyright 2007-2008 Roy Marples <roy@marples.name>
# All rights reserved. Released under the 2-clause BSD license.

extra_commands="reset"
hostid_file=${hostid_file:-/etc/hostid}

depend()
{
	need root
	before devd net
	keyword nojail noprefix
}

_set()
{
	local id=0

	if [ -n "$1" ]; then
		id=$(echo "$1" | md5)
		id="0x${id%????????????????????????}"
	fi
	ebegin "Setting Host ID: ${id}"
	sysctl -w kern.hostid="${id}" >/dev/null
	eend $? || return 1

	if sysctl -n kern.hostuuid >/dev/null 2>&1; then
		[ -n "$1" ] && id=$1
		ebegin "Setting Host UUID: ${id}"
		sysctl kern.hostuuid="${id}" >/dev/null
		eend $? || return 1
	fi

}

# First we check to see if there is a system UUID
# If so then we use that and erase the hostid file,
# otherwise we generate a random UUID.
reset()
{
	local uuid=$(kenv smbios.system.uuid 2>/dev/null)
	local x="[0-9a-f]"
	local y="${x}${x}${x}${x}"
	case "${uuid}" in
		${y}${y}-${y}-${y}-${y}-${y}${y}${y});;
		*) uuid=;;
	esac

	if [ -n "${uuid}" ]; then
		rm -f "${hostid_file}"
	else
		uuid=$(uuidgen)
		if [ -z "${uuid}" ]; then
			eerror "Unable to generate a UUID"
			return 1
		fi
		if ! echo "${uuid}" > "${hostid_file}"; then
			eerror "Failed to store UUID in \`${hostid_file}'"
			return 1
		fi
	fi

	_set "${uuid}"
}

start()
{
	if [ -r "${hostid_file}" ]; then
		_set $(cat "${hostid_file}") 
	else
		reset
	fi
}

stop()
{
	_set
}