#!/bin/sh

set -u

main()
{
	local boot=

	[ "x$(id -u)" = 'x0' ] || error 'Must be run as the superuser'

	if [ ${#} -ne 2 ]; then
		usage >&2
		exit 1
	fi
	boot="${1}"
	root="${2}"

	[ -e "${boot}" ] || error 'Boot device not found'
	[ -e /etc/lilo.conf.in ] || \
		error '/etc/lilo.conf: No such file or directory'
	[ -e /etc/lilo.conf ] && error '/etc/lilo.conf exists'

	sed "s|@BOOT@|${boot}|g; s|@ROOT@|${root}|g;" /etc/lilo.conf.in \
		>/etc/lilo.conf
	/sbin/lilo
	rm /etc/lilo.conf
}

usage()
{
	printf 'Usage: install-lilo <boot> <root>\n'
}

error()
{
	local fmt="${1}"
	shift 1

	printf "install-lilo: Error: ${fmt}\n" "${@}"
	exit 2
}

main "${@}"