post_install() {
  groupadd -f flutter
  setfacl -R -m "g:flutter:rwX" /opt/flutter

  # needed to build with clean chroot scripts
  for _builder in builduser main-builder; do
    if grep "$_builder" /etc/passwd > /dev/null; then
      setfacl -R -m "u:$_builder:rwX" /opt/flutter
    fi
  done

  echo "Users may be added to the 'flutter' group:"
  echo "   sudo usermod -a -G flutter"
}

post_upgrade() {
  post_install
}

post_remove() {
  echo "The 'flutter' group may be removed, if no longer needed:"
  echo "   sudo groupdel flutter"
}