gistfile1.txt

  user { $username:
    comment => "$email",
    home    => "/home/$username",
    shell   => "/bin/bash",
    uid     => $uid,
    groups  => $admin ? {
      true  => $groups += ['wheel'],
      false => $groups,
    } += $http ? {
      true => [$nginx::params::nx_daemon_user],
      false => []
    },
    require => $http ? {
      true => Class['nginx::package'],
      false => []
    },
  }