+Adds an apt source to `/etc/apt/sources.list.d/`.
+
+ apt::source { 'debian_unstable':
+ location => 'http://debian.mirror.iweb.ca/debian/',
+ release => 'unstable',
+ repos => 'main contrib non-free',
+ required_packages => 'debian-keyring debian-archive-keyring',
+ key => '55BE302B',
+ key_server => 'subkeys.pgp.net',
+ pin => '-10',
+ include_src => true
+ }
+
+If you would like to configure your system so the source is the Puppet Labs APT repository
+
+ apt::source { 'puppetlabs':
+ location => 'http://apt.puppetlabs.com',
+ repos => 'main',
+ key => '4BD6EC30',
+ key_server => 'pgp.mit.edu',
+ }
+
+### Testing
+
+The APT module is mostly a collection of defined resource types, which provide reusable logic that can be leveraged to manage APT. It does provide smoke tests for testing functionality on a target system, as well as spec tests for checking a compiled catalog against an expected set of resources.
+
+#### Example Test
+
+This test will set up a Puppet Labs apt repository. Start by creating a new smoke test in the apt module's test folder. Call it puppetlabs-apt.pp. Inside, declare a single resource representing the Puppet Labs APT source and gpg key
+
+ apt::source { 'puppetlabs':
+ location => 'http://apt.puppetlabs.com',
+ repos => 'main',
+ key => '4BD6EC30',
+ key_server => 'pgp.mit.edu',
+ }
+
+This resource creates an apt source named puppetlabs and gives Puppet information about the repository's location and key used to sign its packages. Puppet leverages Facter to determine the appropriate release, but you can set it directly by adding the release type.
+
+Check your smoke test for syntax errors
+
+ $ puppet parser validate tests/puppetlabs-apt.pp
+
+If you receive no output from that command, it means nothing is wrong. Then apply the code
+
+ $ puppet apply --verbose tests/puppetlabs-apt.pp
+ notice: /Stage[main]//Apt::Source[puppetlabs]/File[puppetlabs.list]/ensure: defined content as '{md5}3be1da4923fb910f1102a233b77e982e'
+ info: /Stage[main]//Apt::Source[puppetlabs]/File[puppetlabs.list]: Scheduling refresh of Exec[puppetlabs apt update]
+ notice: /Stage[main]//Apt::Source[puppetlabs]/Exec[puppetlabs apt update]: Triggered 'refresh' from 1 events>
+
+The above example used a smoke test to easily lay out a resource declaration and apply it on your system. In production, you may want to declare your APT sources inside the classes where they’re needed.
+
+Implementation
+--------------
+
+### apt::backports
+
+Adds the necessary components to get backports for Ubuntu and Debian. The release name defaults to `$lsbdistcodename`. Setting this manually can cause undefined behavior (read: universe exploding).
+
+Limitations
+-----------
+
+This module should work across all versions of Debian/Ubuntu and support all major APT repository management features.
+
+Development
+------------
+
+Puppet Labs modules on the Puppet Forge are open projects, and community contributions are essential for keeping them great. We can’t access the huge number of platforms and myriad of hardware, software, and deployment configurations that Puppet is intended to serve.
+
+We want to keep it as easy as possible to contribute changes so that our modules work in your environment. There are a few guidelines that we need contributors to follow so that we can have a chance of keeping on top of things.
+
+You can read the complete module contribution guide [on the Puppet Labs wiki.](http://projects.puppetlabs.com/projects/module-site/wiki/Module_contributing)
+
+License
+-------
+
+The original code for this module comes from Evolving Web and was licensed under the MIT license. Code added since the fork of this module is licensed under the Apache 2.0 License like the rest of the Puppet Labs products.
+
+The LICENSE contains both licenses.
+
+Contributors
+------------
+
+A lot of great people have contributed to this module. A somewhat current list follows:
+
+* Ben Godfrey <ben.godfrey@wonga.com>
+* Branan Purvine-Riley <branan@puppetlabs.com>
+* Christian G. Warden <cwarden@xerus.org>
+* Dan Bode <bodepd@gmail.com> <dan@puppetlabs.com>
+* Garrett Honeycutt <github@garretthoneycutt.com>
+* Jeff Wallace <jeff@evolvingweb.ca> <jeff@tjwallace.ca>
+* Ken Barber <ken@bob.sh>
+* Matthaus Litteken <matthaus@puppetlabs.com> <mlitteken@gmail.com>
+* Matthias Pigulla <mp@webfactory.de>
+* Monty Taylor <mordred@inaugust.com>
+* Peter Drake <pdrake@allplayers.com>
+* Reid Vandewiele <marut@cat.pdx.edu>
+* Robert Navarro <rnavarro@phiivo.com>
+* Ryan Coleman <ryan@puppetlabs.com>
+* Scott McLeod <scott.mcleod@theice.com>
+* Spencer Krum <spencer@puppetlabs.com>
+* William Van Hevelingen <blkperl@cat.pdx.edu> <wvan13@gmail.com>
+* Zach Leslie <zach@puppetlabs.com>