local path_pbuilder usage opt_dist opt_safe cb_opt

: ${path_pbuilder:=/var/cache/pbuilder}

usage="$(
cat <<EOF
usage: $0 [-d dist] [-s] [command ...]

Start cowbuilder with shell for named distribution.

options:
  -d dist  Start cowbuilder for distribution dist
           When environment variable DIST is set this option can be
           omitted.
  -s       Safe changes on exit
EOF
)"

if [[ -n $DIST ]]; then
  opt_dist="-$DIST"
else
  opt_dist=
fi

while getopts ':d:s' opt; do
  case "$opt" in
    d)  opt_dist="-$OPTARG"
        ;;
    s)  opt_safe=--safe-after-login
        ;;
    :)
        print "$0: option requires an argument: $OPTARG" >&2
        print "$usage" >&2
        return 1
        ;;
    \?) print "$0: unknown option: $OPTARG" >&2
        print "$usage" >&2
        return 1
        ;;
  esac
done
shift $(( $OPTIND - 1 ))

if [[ -n $opt_safe ]]; then
  cb_opt=$opt_safe "$@"
else
  cb_opt="$@"
fi

sudo -E cowbuilder \
  --bindmount $HOME \
  --login \
  --basepath=${path_pbuilder}/base${opt_dist}.cow $cb_opt