openrc/init.d/hostid.in

#!@SBINDIR@/openrc-run
# Copyright (c) 2007-2015 The OpenRC Authors.
# See the Authors file at the top-level directory of this distribution and
# https://github.com/OpenRC/openrc/blob/master/AUTHORS
#
# This file is part of OpenRC. It is subject to the license terms in
# the LICENSE file found in the top-level directory of this
# distribution and at https://github.com/OpenRC/openrc/blob/master/LICENSE
# This file may not be copied, modified, propagated, or distributed
# except according to the terms contained in the LICENSE file.

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

depend()
{
	use root
	before devd net
	keyword -jail -prefix
}

_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= x="[0-9a-f]" y="$x$x$x$x"

	if command -v kenv >/dev/null 2>&1; then
		uuid=$(kenv smbios.system.uuid 2>/dev/null)
	fi
	case "$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
}