module-apt/manifests/unattended_upgrades.pp

class apt::unattended_upgrades {

  package { 'unattended-upgrades':
    ensure => present,
    require => undef,
  }

  apt_conf { "50unattended-upgrades":
    source  => [
      "puppet:///modules/site_apt/${::lsbdistcodename}/50unattended-upgrades",
  		"puppet:///modules/site_apt/50unattended-upgrades",
	  	"puppet:///modules/apt/${::lsbdistcodename}/50unattended-upgrades" ],
    require => Package['unattended-upgrades'],
  }

  if $custom_preferences != false {
    Apt_conf["50unattended-upgrades"] {
      before => Concat[apt_config],
    }
  }
}