#!/sbin/runscript
# Copyright 2007 Roy Marples
# All rights reserved

# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.

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

depend() {
	need checkroot
	before devd net
}

_set() {
	local id=0

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

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

# 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
}