Install packages from debian backports with puppet

Let's say we have a list of packages you want to install from backports like this:

$backports = [ 'pkg1', 'pkg2' ]

There are a couple of things you have to do:

Add the backports repository to sources.list(.d)

apt::source { 'debian-backports':
  location => "ftp://$SERVER/debian",
  repos => 'main contrib non-free',
  release => 'jessie-backports'
}

pin the packages to a priority of 500 or higher

apt::pin { 'backports_packages':
  packages => $backports,
  priority => 600,
  release => 'jessie-backports'
}

set "ensure => latest", not installed/present

package { $backports: ensure => latest }