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+Overview
+========
+
+This module manages apt on Debian.
+
+It keeps dpkg's and apt's databases as well as the keyrings for securing
+package download current.
+
+backports.debian.org is added.
+
+/etc/apt/sources.list and /etc/apt/preferences are managed. More
+recent Debian releases are pinned to very low values by default to
+prevent accidental upgrades.
+
+Ubuntu support is lagging behind but not absent either.
+
+! Upgrade Notice !
+
+ * The `disable_update` parameter has been removed. The main apt class
+   defaults to *not* run an `apt-get update` on every run anyway so this
+   parameter seems useless.
+   You can include the `apt::update` class if you want it to be run every time.
+
+ * The `apt::upgrade_package` now doesn't automatically call an Exec['apt_updated']
+   anymore, so you would need to include `apt::update` now by hand.
+
+ * The apt::codename parameter has been removed. In its place, the
+   debian_codename fact may be overridden via an environment variable. This
+   will affect all other debian_* facts, and achieve the same result.
+
+     FACTER_debian_codename=jessie puppet agent -t
+
+ * If you were using custom 50unattended-upgrades.${::lsbdistcodename} in your
+   site_apt, these are no longer supported. You should migrate to passing
+   $blacklisted_packages to the apt::unattended_upgrades class.
+
+ * the apt class has been moved to a paramterized class. if you were including
+   this class before, after passing some variables, you will need to move to
+   instantiating the class with those variables instead. For example, if you 
+   had the following in your manifests:
+
+    $apt_debian_url = 'http://localhost:9999/debian/'
+    $apt_use_next_release = true
+    include apt
+ 
+   you will need to remove the variables, and the include and instead do
+   the following:
+
+    class { 'apt': debian_url => 'http://localhost:9999/debian/', use_next_release => true }
+
+   previously, you could manually set $lsbdistcodename which would enable forced
+   upgrades, but because this is a top-level facter variable, and newer puppet
+   versions do not let you assign variables to other namespaces, this is no
+   longer possible. However, there is a way to obtain this functionality, and
+   that is to pass the 'codename' parameter to the apt class, which will change
+   the sources.list and preferences files to be the codename you set, allowing
+   you to trigger upgrades:
+
+   include apt::dist_upgrade
+   class { 'apt': codename => 'wheezy', notify => Exec['apt_dist-upgrade'] }
+
+ * the apticron class has been moved to a parameterized class.  if you were
+   including this class before, you will need to move to instantiating the
+   class instead. For example, if you had the following in your manifests:
+
+    $apticron_email = 'foo@example.com'
+    $apticron_notifynew = '1'
+    ... any $apticron_* variables
+    include apticron
+
+   you will need to remove the variables, and the include and instead do the
+   following:
+
+    class { 'apt::apticron': email => 'foo@example.com', notifynew => '1' }
+
+ * the apt::listchanges class has been moved to a paramterized class. if you
+   were including this class before, after passing some variables, you will need
+   to move to instantiating the class with those variables instead. For example,
+   if you had the following in your manifests:
+
+    $apt_listchanges_email = 'foo@example.com'
+    ... any $apt_listchanges_* variables
+    include apt::listchanges
+
+   you will need to remove the variables, and the include and instead do the
+   following:
+ 
+    class { 'apt::listchanges': email => 'foo@example.com' }
+   
+ * the apt::proxy_client class has been moved to a paramterized class. if you
+   were including this class before, after passing some variables, you will need
+   to move to instantiating the class with those variables instead. For example,
+   if you had the following in your manifests:
+
+    $apt_proxy = 'http://proxy.domain'
+    $apt_proxy_port = 666
+    include apt::proxy_client
+
+   you will need to remove the variables, and the include and instead do the
+   following:
+
+    class { 'apt::proxy_client': proxy => 'http://proxy.domain', port => '666' }
+
+Requirements
+============
+
+This module needs:
+
+- the lsb-release package should be installed on the server prior to running
+  puppet. otherwise, all of the $::lsb* facts will be empty during runs.
+- the common module: https://gitlab.com/shared-puppet-modules-group/common
+
+By default, on normal hosts, this module sets the configuration option
+DSelect::Clean to 'auto'. On virtual servers, the value is set by default to
+'pre-auto', because virtual servers are usually more space-bound and have better
+recovery mechanisms via the host:
+
+From apt.conf(5), 0.7.2:
+     "Cache Clean mode; this value may be one of always, prompt, auto,
+     pre-auto and never. always and prompt will remove all packages
+     from the cache after upgrading, prompt (the default) does so
+     conditionally.  auto removes only those packages which are no
+     longer downloadable (replaced with a new version for
+     instance). pre-auto performs this action before downloading new
+     packages."
+
+To change the default setting for DSelect::Clean, you can create a file named
+"03clean" or "03clean_vserver" in your site_apt module's files directory. You
+can also define this for a specific host by creating a file in a subdirectory of
+the site_apt modules' files directory that is named the same as the
+host. (example: site_apt/files/some.host.com/03clean, or
+site_apt/files/some.host.com/03clean_vserver)
+
+Classes
+=======
+
+apt
+---
+
+The apt class sets up most of the documented functionality. To use functionality
+that is not enabled by default, you must set one of the following parameters.
+
+Example usage:
+
+ class { 'apt': use_next_release => true, debian_url => 'http://localhost:9999/debian/' }
+
+Class parameters:
+
+* use_lts
+
+  If this variable is set to true the CODENAME-lts sources (such as
+  squeeze-lts) are added.
+
+  By default this is false for backward compatibility with older
+  versions of this module.
+
+* use_volatile
+
+  If this variable is set to true the CODENAME-updates sources (such as
+  squeeze-updates) are added.
+
+  By default this is false for backward compatibility with older
+  versions of this module.
+
+* include_src
+
+  If this variable is set to true a deb-src source is added for every
+  added binary archive source.
+
+  By default this is false for backward compatibility with older
+  versions of this module.
+
+* use_next_release
+
+  If this variable is set to true the sources for the next Debian
+  release are added. The default pinning configuration pins it to very
+  low values.
+
+  By default this is false for backward compatibility with older
+  versions of this module.
+
+* debian_url, security_url, backports_url, volatile_url
+
+  These variables allow to override the default APT mirrors respectively
+  used for the standard Debian archives, the Debian security archive,
+  the Debian official backports and the Debian Volatile archive.
+
+* ubuntu_url
+
+  These variables allows to override the default APT mirror used for all
+  standard Ubuntu archives (including updates, security, backports).
+
+* repos
+
+  If this variable is set the default repositories list ("main contrib non-free")
+  is overriden.
+
+* disable_update
+
+  Disable "apt-get update" which is normally triggered by apt::upgrade_package 
+  and apt::dist_upgrade. 
+
+  Note that nodes can be updated once a day by using 
+    APT::Periodic::Update-Package-Lists "1";
+  in i.e. /etc/apt/apt.conf.d/80_apt_update_daily.
+
+* custom_preferences
+
+  For historical reasons (Debian Lenny's version of APT did not support the use
+  of the preferences.d directory for putting fragments of 'preferences'), this
+  module will manage a default generic apt/preferences file with more
+  recent releases pinned to very low values so that any package
+  installation will not accidentally pull in packages from those suites
+  unless you explicitly specify the version number. This file will be
+  complemented with all of the preferences_snippet calls (see below).
+
+  If the default preferences template doesn't suit your needs, you can create a
+  template located in your site_apt module, and set custom_preferences with the
+  content (eg. custom_preferences => template('site_apt/preferences') )
+
+  Setting this variable to false before including this class will force the
+  apt/preferences file to be absent:
+
+    class { 'apt': custom_preferences => false }
+  
+* custom_sources_list
+
+  By default this module will use a basic apt/sources.list template with
+  a generic Debian mirror. If you need to set more specific sources,
+  e.g. changing the sections included in the source, etc. you can set
+  this variable to the content that you desire to use instead.
+
+  For example, setting this variable will pull in the
+  templates/site_apt/sources.list file:
+
+  class { 'apt': custom_sources_list => template('site_apt/sources.list') }
+
+* custom_key_dir
+
+  If you have different apt-key files that you want to get added to your
+  apt keyring, you can set this variable to a path in your fileserver
+  where individual key files can be placed. If this is set and keys
+  exist there, this module will 'apt-key add' each key.
+
+  The debian-archive-keyring package is installed and kept current up to the
+  latest revision (this includes the backports archive keyring).
+
+apt::apticron
+-------------
+
+When you instantiate this class, apticron will be installed, with the following
+defaults, which you are free to change:
+
+  $ensure_version = 'installed',
+  $config = "apt/${::operatingsystem}/apticron_${::lsbdistcodename}.erb",
+  $email = 'root',
+  $diff_only = '1',
+  $listchanges_profile = 'apticron',
+  $system = false,
+  $ipaddressnum = false,
+  $ipaddresses = false,
+  $notifyholds = '0',
+  $notifynew = '0',
+  $customsubject = ''
+
+Example usage:
+
+ class { 'apt::apticron': email => 'foo@example.com', notifynew => '1' }
+
+apt::cron::download
+-------------------
+
+This class sets up cron-apt so that it downloads upgradable packages, does not
+actually do any upgrade and emails when the output changes.
+
+cron-apt defaults to run at 4 AM. You may want to set the
+$apt_cron_hours variable before you include the class: its value will
+be passed as the "hours" parameter of a cronjob. Example:
+
+ # Run cron-apt every three hours
+ $apt_cron_hours = '*/3'
+
+Note that the default 4 AM cronjob won't be disabled.
+
+apt::cron::dist_upgrade
+-----------------------
+
+This class sets up cron-apt so that it dist-upgrades the system and
+emails when upgrades are performed.
+
+See apt::cron::download above if you need to run cron-apt more often
+than once a day.
+
+apt::dist_upgrade
+-----------------
+
+This class provides the Exec['apt_dist-upgrade'] resource that
+dist-upgrade's the system.
+
+This exec is set as refreshonly so including this class does not
+trigger any action per-se: other resources may notify it, other
+classes may inherit from this one and add to its subscription list
+using the plusignment ('+>') operator. A real-world example can be
+seen in the apt::dist_upgrade::initiator source.
+
+apt::dist_upgrade::initiator
+----------------------------
+
+This class automatically dist-upgrade's the system when an initiator
+file's content changes. The initiator file is copied from the first
+available source amongst the following ones, in decreasing priority
+order:
+
+- puppet:///modules/site_apt/${::fqdn}/upgrade_initiator
+- puppet:///modules/site_apt/upgrade_initiator
+- puppet:///modules/apt/upgrade_initiator
+
+This is useful when one does not want to setup a fully automated
+upgrade process but still needs a way to manually trigger full
+upgrades of any number of systems at scheduled times.
+
+Beware: a dist-upgrade is triggered the first time Puppet runs after
+this class has been included. This is actually the single reason why
+this class is not enabled by default.
+
+When this class is included the APT indexes are updated on every
+Puppet run due to the author's lack of Puppet wizardry.
+
+apt::dselect
+------------
+
+This class, when included, installs dselect and switches it to expert mode to
+suppress superfluous help screens.
+
+apt::listchanges
+----------------
+
+This class, when instantiated, installs apt-listchanges and configures it using
+the following parameterized variables, which can be changed:
+
+ version = 'present'
+ config = "apt/${::operatingsystem}/listchanges_${::lsbrelease}.erb"
+ frontend = 'pager'
+ email = 'root'
+ confirm = 0
+ saveseen = '/var/lib/apt/listchanges.db'
+ which = 'both'
+
+ Example usage:
+  class { 'apt::listchanges': email => 'foo@example.com' }
+ 
+apt::proxy_client
+-----------------
+
+This class adds the right configuration to apt to make it fetch packages via a
+proxy. The class parameters apt_proxy and apt_proxy_port need to be set:
+
+You can set the 'proxy' class parameter variable to the URL of the proxy that
+will be used.  By default, the proxy will be queried on port 3142, but you can
+change the port number by setting the 'port' class parameter.
+
+Example:
+
+ class { 'apt::proxy_client': proxy => 'http://proxy.domain', port => '666' }
+
+apt::reboot_required_notify
+---------------------------
+
+This class installs a daily cronjob that checks if a package upgrade
+requires the system to be rebooted; if so, cron sends a notification
+email to root.
+
+apt::unattended_upgrades
+------------------------
+
+If this class is included, it will install the package 'unattended-upgrades'
+and configure it to daily upgrade the system.
+
+The class has the following parameters that you can use to change the contents
+of the configuration file. The values shown here are the default values:
+
+ * $config_content = undef
+ * $config_template = 'apt/50unattended-upgrades.erb'
+ * $mailonlyonerror = true
+ * $mail_recipient = 'root'
+ * $blacklisted_packages = []
+
+Note that using $config_content actually specifies all of the configuration
+contents and thus makes the other parameters useless.
+
+example:
+
+    class { 'apt::unattended_upgrades':
+      config_template      => 'site_apt/50unattended-upgrades.jessie',
+      blacklisted_packages => [
+       'libc6', 'libc6-dev', 'libc6-i686', 'mysql-server', 'redmine', 'nodejs',
+       'bird'
+      ],
+    }
+
+Defines
+=======
+
+apt::apt_conf
+-------------
+
+Creates a file in the apt/apt.conf.d directory to easily add configuration
+components. One can use either the 'source' meta-parameter to specify a list of
+static files to include from the puppet fileserver or the 'content'
+meta-parameter to define content inline or with the help of a template.
+
+Example:
+
+  apt::apt_conf { '80download-only':
+    source => 'puppet:///modules/site_apt/80download-only',
+  }
+
+apt::preferences_snippet
+------------------------
+
+A way to add pinning information to files in /etc/apt/preferences.d/
+
+Example:
+
+  apt::preferences_snippet {
+    'irssi-plugin-otr':
+      release => 'squeeze-backports',
+      priority => 999;
+  }
+
+  apt::preferences_snippet {
+    'unstable_fallback':
+      package => '*',
+      release => 'unstable',
+      priority => 1;
+  }
+
+  apt::preferences_snippet {
+    'ttdnsd':
+      pin => 'origin deb.torproject.org',
+      priority => 999;
+  }
+
+The names of the resources will be used as the names of the files in the
+preferences.d directory, so you should ensure that resource names follow the
+prescribed naming scheme.
+
+From apt_preferences(5):
+     Note that the files in the /etc/apt/preferences.d directory are parsed in
+     alphanumeric ascending order and need to obey the following naming
+     convention: The files have no or "pref" as filename extension and which
+     only contain alphanumeric, hyphen (-), underscore (_) and period (.)
+     characters - otherwise they will be silently ignored.
+
+apt::preseeded_package
+----------------------
+
+This simplifies installation of packages for which you wish to preseed the
+answers to debconf. For example, if you wish to provide a preseed file for the
+locales package, you would place the locales.seed file in
+'site_apt/templates/${::lsbdistcodename}/locales.seeds' and then include the
+following in your manifest:
+
+  apt::preseeded_package { locales: }
+
+You can also specify the content of the seed via the content parameter, 
+for example:
+
+  apt::preseeded_package { 'apticron':
+    content => 'apticron   apticron/notification   string  root@example.com',
+  }
+
+apt::sources_list
+-----------------
+
+Creates a file in the apt/sources.list.d directory to easily add additional apt
+sources. One can use either the 'source' meta-parameter to specify a list of
+static files to include from the puppet fileserver or the 'content'
+meta-parameter to define content inline or with the help of a template. Ending
+the resource name in '.list' is optional: it will be automatically added to the
+file name if not present in the resource name.
+
+Example:
+
+  apt::sources_list { 'company_internals':
+    source => [ "puppet:///modules/site_apt/${::fqdn}/company_internals.list",
+                'puppet:///modules/site_apt/company_internals.list' ],
+  }
+
+apt::key
+--------
+
+Deploys a secure apt OpenPGP key. This usually accompanies the
+sources.list snippets above for third party repositories. For example,
+you would do:
+
+  apt::key { 'neurodebian.gpg':
+    ensure => present,
+    source => 'puppet:///modules/site_apt/neurodebian.gpg',
+  }
+
+This deploys the key in the `/etc/apt/trusted.gpg.d` directory, which
+is assumed by secure apt to be binary OpenPGP keys and *not*
+"ascii-armored" or "plain text" OpenPGP key material. For the latter,
+use `apt::key::plain`.
+
+The `.gpg` extension is compulsory for `apt` to pickup the key properly.
+
+apt::key::plain
+---------------
+
+Deploys a secure apt OpenPGP key. This usually accompanies the
+sources.list snippets above for third party repositories. For example,
+you would do:
+
+  apt::key::plain { 'neurodebian.asc':
+    source => 'puppet:///modules/site_apt/neurodebian.asc',
+  }
+
+This deploys the key in the `${apt_base_dir}/keys` directory (as
+opposed to `$custom_key_dir` which deploys it in `keys.d`). The reason
+this exists on top of `$custom_key_dir` is to allow a more
+decentralised distribution of those keys, without having all modules
+throw their keys in the same directory in the manifests.
+
+Note that this model does *not* currently allow keys to be removed!
+Use `apt::key` instead for a more practical, revokable approach, but
+that needs binary keys.
+
+apt::upgrade_package
+--------------------
+
+This simplifies upgrades for DSA security announcements or point-releases. This
+will ensure that the named package is upgraded to the version specified, only if
+the package is installed, otherwise nothing happens. If the specified version
+is 'latest' (the default), then the package is ensured to be upgraded to the
+latest package revision when it becomes available.
+
+For example, the following upgrades the perl package to version 5.8.8-7etch1
+(if it is installed), it also upgrades the syslog-ng and perl-modules packages
+to their latest (also, only if they are installed):
+
+upgrade_package { 'perl':
+			version => '5.8.8-7etch1';
+		  'syslog-ng':
+			version => latest;
+		  'perl-modules':
+}
+
+Resources
+=========
+
+File['apt_config']
+------------------
+
+Use this resource to depend on or add to a completed apt configuration
+
+Exec['apt_updated']
+-------------------
+
+After this point the APT indexes are up-to-date.
+This resource is set to `refreshonly => true` so it is not run on
+every puppetrun. To run this every time, you can include the `apt::update`
+class.
+
+This resource is usually used like this to ensure current packages are
+installed by Package resources:
+
+    include apt::update
+    Package { require => Exec['apt_updated'] }
+
+Note that nodes can be updated once a day by using
+
+    APT::Periodic::Update-Package-Lists "1";
+
+in i.e. /etc/apt/apt.conf.d/80_apt_update_daily.
+
+
+Tests
+=====
+
+To run pupept rspec tests:
+
+    bundle install --path vendor/bundle
+    bundle exec rake spec
+
+Using different facter/puppet versions:
+
+    FACTER_GEM_VERSION=1.6.10 PUPPET_GEM_VERSION=2.7.23 bundle install --path vendor/bundle
+    bundle exec rake spec
+
+Licensing
+=========
+
+This puppet module is licensed under the GPL version 3 or later. Redistribution
+and modification is encouraged.
+
+The GPL version 3 license text can be found in the "LICENSE" file accompanying
+this puppet module, or at the following URL:
+
+http://www.gnu.org/licenses/gpl-3.0.html