define nspawn::util::disable_networking (
  String $template_name = $name,
  String $template_dir = $nspawn::template_dir,
  String $template_path = "${template_dir}/${template_name}.base",
) {

  $running = $facts['machined-info'][$template_name] != undef 
         and $facts['machined-info'][$template_name]['State'] == 'running' 

  $cmd = if $running {
    [ 'systemctl', '-M', $template_name, 'disable', 'networking' ]
  } else {
    [ 'systemd-nspawn', '-M', $template_name, '--quiet',
      'systemctl', 'disable', 'networking' ]
  }

  exec { "Disable networking on ${template_name}":
    command => $cmd,
    path    => [ '/bin', '/usr/bin', ],
    # among others
    # creates => "${machine_path}/etc/systemd/system/multi-user.target.wants/systemd-networkd.service",
  }

}