#!/bin/sh

_root="$(dirname "${0}")"; . "${_root}/lib/env.sh"
want root log

err "Don't use me yet!"

pebkac() {
  echo "Insert help here"
}

while getopts "d:o:h" opt
do
  case "${opt}" in
    d) dev="${OPTARG}" ;;
    o) conf="${OPTARG}" ;;
    h) pebkac ;;
    [?]) pebkac "Unrecognized option ${opt}" ;;
  esac
done
shift $(( $OPTIND - 1 ))

_dev="${dev}"
tgt="${tgt:-${_root}/../src/conf}"

[ -b "${dev}" -o -c "${dev}" ] || dev="/dev/${dev}"
[ -b "${dev}" -o -c "${dev}" ] || err "${_dev}: no such file or directory"
[ -d "${tgt}" ] || err "${tgt}: not a directory"

tmpdir="$(mktemp -d "$(dirname "${tgt}").XXXXXXXX")"
tmpmnt="$(mktemp -d "/tmp/conf.XXXXXXXX")"
trap "umount -f '${tmpmnt}'; rm -Rf '${tmpdir}' '${tmpmnt}'" exit hup int term kill
chk cd "${tmpdir}"
chk mount "${dev}" "${tmpmnt}"

( zcat "${tmpmnt}/default/etc.cpio.gz" | cpio -id ) || chk
( zcat "${tmpmnt}/default/var.cpio.gz" | cpio -id ) || chk
chk umount "${tmpmnt}"
chk rm -Rf "${tmpmnt}"
rm -Rf "${tgt}.old"
chk mv "${tgt}" "${tgt}.old"
chk mv "${tmpdir}" "${tgt}"
trap "" exit hup int term kill