#!/bin/bash

shopt -s extglob

m4_include(common)

usage() {
  cat <<EOF
usage: ${0##*/} chroot-dir [command]

    -h             Print this help message

If 'command' is unspecified, ${0##*/} will launch /bin/sh.

EOF
}

if [[ -z $1 || $1 = @(-h|--help) ]]; then
  usage
  exit $(( $# ? 0 : 1 ))
fi

(( EUID == 0 )) || die 'This script must be run with root privileges'
chrootdir=$1
shift

[[ -d $chrootdir ]] || die "Can't create chroot on non-directory %s" "$chrootdir"

chroot_setup "$chrootdir" || die "failed to setup API filesystems in chroot %s" "$chrootdir"
chroot_add_mount /etc/resolv.conf "$chrootdir/etc/resolv.conf" --bind

SHELL=/bin/sh unshare --fork --pid chroot "$chrootdir" "$@"