gistfile1.txt

class { 'apt::unattended_upgrades':
    blacklisted_packages => [ 'libc6', 'libc6-dev', 'libc6-i686',
                              'mysql-server', 'redmine', 'nodejs', 'bird' ],
    config_template      => 'site_apt/50unattended-upgrades.jessie',
  }


class apt::unattended_upgrades (
  $config_template = undef,
  $mailonlyonerror = true,
  $mail_recipient = 'root',
  $blacklisted_packages = [],
  $ensure_version = present
) {

  package { 'unattended-upgrades':
    ensure  => $ensure_version
  }

  $file_content = $config_template ? {
    undef   => template('apt/50unattended-upgrades.erb'),
    default => template($config_template),
  }

  apt_conf { '50unattended-upgrades':
    content     => $file_content,
    require     => Package['unattended-upgrades'],
    refresh_apt => false
  }
}

#20: $file_content = $config_template ? {