define apt::preferences($ensure="present", $package="", $pin, $priority) {

  $pkg = $package ? {
    "" => $name,
    default => $package,
  }

  $fname = regsubst($name, '\.', '-', 'G')

  # apt support preferences.d since version >= 0.7.22
  if versioncmp($::apt_version, '0.7.22') >= 0 {
   file {"/etc/apt/preferences.d/$fname":
      ensure  => $ensure,
      owner   => root,
      group   => root,
      mode    => 644,
      content => template("apt/preferences.erb"),
      before  => Exec["apt-get_update"],
      notify  => Exec["apt-get_update"],
    }
  }

}