Add parameter for blacklisting a list of packages.

This functionality was lost because we stopped using a source file for
the 50unattended-upgrades file that would previously let one override
the configuration per release or per host.

README

@@ -17,6 +17,10 @@ Ubuntu support is lagging behind but not absent either.
 
 ! Upgrade Notice !
 
+ * 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 

manifests/unattended_upgrades.pp

@@ -2,6 +2,7 @@ class apt::unattended_upgrades (
   $config_content = undef,
   $mailonlyonerror = true,
   $mail_recipient = 'root',
+  $blacklisted_packages = [],
 ) {
 
   package { 'unattended-upgrades':

templates/50unattended-upgrades.erb

@@ -16,6 +16,14 @@ Unattended-Upgrade::Allowed-Origins {
 <% end -%>
 };
 
+<% if not @blacklisted_packages.empty?  -%>
+Unattended-Upgrade::Package-Blacklist {
+<% @blacklisted_packages.each do |pkg| -%>
+  "<%= pkg %>";
+<% end -%>
+}
+<% end -%>
+
 APT::Periodic::Update-Package-Lists "1";
 APT::Periodic::Download-Upgradeable-Packages "1";
 APT::Periodic::Unattended-Upgrade "1";