Merge branch 'volatile-backports' into 'master'

allow disabling backports (and volatile in ubuntu)

as the module stands now, there's no way to disable backports.

there are a few reasons why we want to allow this:

* "tools, not policy" - if Debian doesn't ship with backports enabled by default, why should we change that policy?
* too many sources.list entries can cause problems on `apt-get update`, which can run out of memory and require special config
* if the pinning fails, some packages may be updated by mistake
* even if pinning works, some may *want* to keep admins from installing anything from backports as a policy

this keeps backports installed by default (begrudgingly) however. it just allows disabling it.

it also allows disabling volatile in ubuntu, which wasn't possible before.

See merge request !16

manifests/init.pp

@@ -7,6 +7,7 @@ class apt(
   $codename = $apt::params::codename,
   $use_lts = $apt::params::use_lts,
   $use_volatile = $apt::params::use_volatile,
+  $use_backports = $apt::params::use_backports,
   $include_src = $apt::params::include_src,
   $use_next_release = $apt::params::use_next_release,
   $debian_url = $apt::params::debian_url,

manifests/params.pp

@@ -2,6 +2,7 @@ class apt::params () {
   $codename = $::lsbdistcodename
   $use_lts = false
   $use_volatile = false
+  $use_backports = true
   $include_src = false
   $use_next_release = false
   $debian_url = 'http://httpredir.debian.org/debian/'

templates/Debian/sources.list.erb

@@ -19,14 +19,16 @@ deb-src <%= security_url %> <%= codename %>/updates <%= lrepos %>
 # There is no security support for <%= release %>
 <% end -%>
 
+<% if use_backports=scope.lookupvar('apt::use_backports') -%>
 # backports
-<% if (release == "testing" || release == "unstable" || release == "experimental") -%>
+<%   if (release == "testing" || release == "unstable" || release == "experimental") -%>
 # There is no backports archive for <%= release %>
-<% else -%>
+<%   else -%>
 deb <%= backports_url=scope.lookupvar('apt::backports_url') %> <%= codename %>-backports <%= lrepos %>
-<%   if include_src -%>
+<%     if include_src -%>
 deb-src <%= backports_url %> <%= codename %>-backports <%= lrepos %>
-<%   end
+<%     end
+     end
    end -%>
 
 <% if use_volatile=scope.lookupvar('apt::use_volatile') -%>

templates/Ubuntu/sources.list.erb

@@ -7,11 +7,13 @@ deb <%= ubuntu_url=scope.lookupvar('apt::ubuntu_url') %> <%= codename %> <%= lre
 deb-src <%= ubuntu_url %> <%= codename %> <%= lrepos %>
 <% end -%>
 
+<% if use_volatile=scope.lookupvar('apt::use_volatile') -%>
 # updates
 deb <%= ubuntu_url %> <%= codename %>-updates <%= lrepos %>
-<% if include_src -%>
+<%   if include_src -%>
 deb-src <%= ubuntu_url %> <%= codename %>-updates <%= lrepos %>
-<% end -%>
+<%   end
+   end -%>
 
 # security suppport
 deb <%= ubuntu_url %> <%= codename %>-security <%= lrepos %>
@@ -19,8 +21,10 @@ deb <%= ubuntu_url %> <%= codename %>-security <%= lrepos %>
 deb-src <%= ubuntu_url %> <%= codename %>-security <%= lrepos %>
 <% end -%>
 
+<% if use_backports=scope.lookupvar('apt::use_backports') -%>
 # backports
 deb <%= ubuntu_url %> <%= codename %>-backports <%= lrepos %>
-<% if include_src -%>
+<%   if include_src -%>
 deb-src <%= ubuntu_url %> <%= codename %>-backports <%= lrepos %>
-<% end -%>
+<%   end
+   end -%>