install_command: 'required',
                 install_command_retries: 0,
                 extra: '')

  raise ArgumentError, 'update_command is required' if update_command == 'required'
  raise ArgumentError, 'update_tracking_file is required' if update_tracking_file == 'required'
  raise ArgumentError, 'install_command is required' if install_command == 'required'