_builders=(
  builder
  builduser
  main-builder
)

_groups=(
  flutter
  flutteruser
)

post_install() {
  # primary flutter group
  groupadd -f flutter

  for i in "${_groups[@]}"; do
    if grep -q "$i" /etc/passwd > /dev/null; then
      setfacl -R -m "g:$i:rwX" /opt/flutter
    fi
  done

  # clean chroot/container builders
  for i in "${_builders[@]}"; do
    if grep -q "$i" /etc/passwd > /dev/null; then
      setfacl -R -m "u:$i:rwX" /opt/flutter
    fi
  done

  echo "Users may be added to the 'flutter' group:"
  echo "   sudo usermod -a -G flutter [username]"
  echo
  echo "Warning: Do not store important data in '/opt/flutter'"
}

post_upgrade() {
  post_install
}

pre_install() {
  chmod -R u+rwX,go+rX,go-w opt/flutter
}

pre_upgrade() {
  chmod -R u+rwX,go+rX,go-w opt/flutter
}

pre_remove() {
  # remove extra permissions
  for i in ${_builders[@]} ${_groups[@]}; do
    if grep -q "group:$i" <<< $(getfacl -ac /opt/flutter 2> /dev/null); then
      sudo setfacl -R -x "g:$i" /opt/flutter
    fi
    if grep -q "user:$i" <<< $(getfacl -ac /opt/flutter 2> /dev/null); then
      sudo setfacl -R -x "u:$i" /opt/flutter
    fi
  done

  chmod -R u+rwX,go+rX,go-w opt/flutter
}

post_remove() {
  rm -rf opt/flutter

  echo "If no longer needed, remove the 'flutter' group:"
  echo "   sudo groupdel flutter"
}