fix for $lsbdistcodename regression introduced by ac166366d7baa45b74e09974289d9fb2dad38e67

What happened here was the $codename = $::lsbdistcodename was removed from
init.pp and replaced with just $::lsbdistcodename whereever $codename was
used. Then in the sources.list.erb and preferences files things were changed
like this:

<pre>+### Debian current: <%= codename = scope.lookupvar('::lsbdistcodename') %>
...
-deb <%= debian_url %> <%= codename %> <%= repos %>
...
+deb <%= debian_url=scope.lookupvar('apt::debian_url') %> <%= codename %> <%= repos=scope.lookupvar('apt::repos') %>
</pre>

This meant that the codename was always set to lsbdistcodename, and you because
in newer puppet versions you cannot assign a value to a top-level facter
variable, it is not possible to change this.

Because we cannot change $lsbdistcodename, we have to fix this by allowing the
user to pass a different, non-top-level scoped variable to the class as a
parameter, which defaults to $::lsbdistcodename, so that upgrades can be
triggered.

This is documented in the README in an upgrade notice

2 files changed, 18 insertions, 18 deletions

diff --git a/templates/Ubuntu/preferences_maverick.erb b/templates/Ubuntu/preferences_maverick.erb
index 6f6ea45..801ddd4 100644
--- a/templates/Ubuntu/preferences_maverick.erb
+++ b/templates/Ubuntu/preferences_maverick.erb
@@ -1,26 +1,26 @@
-Explanation: Ubuntu <%= scope.lookupvar('::lsbdistcodename') %> security
+Explanation: Ubuntu <%= codename=scope.lookupvar('apt::codename') %> security
 Package: *
-Pin: release o=Ubuntu,a=<%= scope.lookupvar('::lsbdistcodename') %>-security
+Pin: release o=Ubuntu,a=<%= codename %>-security
 Pin-Priority: 990
 
-Explanation: Ubuntu <%= scope.lookupvar('::lsbdistcodename') %> updates
+Explanation: Ubuntu <%= codename %> updates
 Package: *
-Pin: release o=Ubuntu,a=<%= scope.lookupvar('::lsbdistcodename') %>-updates
+Pin: release o=Ubuntu,a=<%= codename %>-updates
 Pin-Priority: 980
 
-Explanation: Ubuntu <%= scope.lookupvar('::lsbdistcodename') %>
+Explanation: Ubuntu <%= codename %>
 Package: *
-Pin: release o=Ubuntu,a=<%= scope.lookupvar('::lsbdistcodename') %>
+Pin: release o=Ubuntu,a=<%= codename %>
 Pin-Priority: 970
 
 Explanation: Ubuntu backports
 Package: *
-Pin: release a=<%= scope.lookupvar('::lsbdistcodename') %>-backports
+Pin: release a=<%= codename %>-backports
 Pin-Priority: 200
 
-Explanation: Ubuntu <%= scope.lookupvar('apt::next_release') %>
+Explanation: Ubuntu <%= next_release=scope.lookupvar('apt::next_release') %>
 Package: *
-Pin: release o=Ubuntu,a=<%= scope.lookupvar('apt::next_release') %>
+Pin: release o=Ubuntu,a=<%= next_release %>
 Pin-Priority: 2
 
 Explanation: Ubuntu fallback
diff --git a/templates/Ubuntu/sources.list.erb b/templates/Ubuntu/sources.list.erb
index ed31fbc..c1a6115 100644
--- a/templates/Ubuntu/sources.list.erb
+++ b/templates/Ubuntu/sources.list.erb
@@ -1,26 +1,26 @@
 # This file is managed by puppet
 # all local modifications will be overwritten
 
-# basic <%= lsbdistcodename=scope.lookupvar('::lsbdistcodename') %>
-deb <%= ubuntu_url=scope.lookupvar('apt::ubuntu_url') %> <%= lsbdistcodename %> <%= lrepos=scope.lookupvar('apt::real_repos') %>
+# basic <%= codename=scope.lookupvar('apt::codename') %>
+deb <%= ubuntu_url=scope.lookupvar('apt::ubuntu_url') %> <%= codename %> <%= lrepos=scope.lookupvar('apt::real_repos') %>
 <% if include_src=scope.lookupvar('apt::include_src') -%>
-deb-src <%= ubuntu_url %> <%= lsbdistcodename %> <%= lrepos %>
+deb-src <%= ubuntu_url %> <%= codename %> <%= lrepos %>
 <% end -%>
 
 # updates
-deb <%= ubuntu_url %> <%= lsbdistcodename %>-updates <%= lrepos %>
+deb <%= ubuntu_url %> <%= codename %>-updates <%= lrepos %>
 <% if include_src -%>
-deb-src <%= ubuntu_url %> <%= lsbdistcodename %>-updates <%= lrepos %>
+deb-src <%= ubuntu_url %> <%= codename %>-updates <%= lrepos %>
 <% end -%>
 
 # security suppport
-deb <%= ubuntu_url %> <%= lsbdistcodename %>-security <%= lrepos %>
+deb <%= ubuntu_url %> <%= codename %>-security <%= lrepos %>
 <% if include_src -%>
-deb-src <%= ubuntu_url %> <%= lsbdistcodename %>-security <%= lrepos %>
+deb-src <%= ubuntu_url %> <%= codename %>-security <%= lrepos %>
 <% end -%>
 
 # backports
-deb <%= ubuntu_url %> <%= lsbdistcodename %>-backports main <%= lrepos %>
+deb <%= ubuntu_url %> <%= codename %>-backports main <%= lrepos %>
 <% if include_src -%>
-deb-src <%= ubuntu_url %> <%= lsbdistcodename %>-backports <%= lrepos %>
+deb-src <%= ubuntu_url %> <%= codename %>-backports <%= lrepos %>
 <% end -%>