Listing 7. modules/nagios/manifests/resource/hostgroup.pp

define nagios::resource::hostgroup(
  $target,
  $ensure = 'present',
  $hostgroup_alias = '',
  $export = false
) {

  include nagios::params

  if $export {
    fail("It is not appropriate to export the Nagios_hostgroup type since it will result in duplicate resources.")
  } else {
    nagios_hostgroup { $name:
      ensure => $ensure,
      target => $target,
      require => File[$nagios::params::resource_dir],
    }
  }
}