first attempt at apt cache file override

manifests/os/debian.pp

@@ -7,7 +7,33 @@
 
 # We install filter-syslog rules, so make sure that newsyslog is always
 # installed.
-class base::os::debian {
+#
+# PARAMETERS
+# ----------
+#
+# $apt_cache_notin_tmp: If you want apt to use a directory other than
+# /tmp for its temporary cache, set this parameter to "true". This is needed
+# if the /tmp partition is set to "noexec" (apt often needs to execture
+# configuration files as part of an install or uninstall).
+#
+# If $apt_cache_notin_tmp is set to "true" and $apt_cache_directory is
+# undefined, then apt will use /var/cache/apt/tmp for its temporary
+# directory. If you want to specify a different directory, set
+# the $apt_cache_tmp_dir.
+#
+# $apt_cache_tmp_dir: if $apt_cache_notin_tmp is set to "false" this
+# parameter is ignored. If $apt_cache_notin_tmp is set to "true" then we
+# configure apt to use $apt_cache_tmp_dir as apt's temporary directory
+# during package installs and uninstalls.
+#
+# NOTE! If you use $apt_cache_tmp_dir to override the default, then you
+# must have $apt_cache_tmp_dir as a file resource in your own Puppet
+# code, otherwise Puppet will fail.
+
+class base::os::debian (
+  $apt_cache_notin_tmp = false,
+  $apt_cache_tmp_dir   = '/var/cache/apt/tmp'
+){
   include base::newsyslog
 
   # This really needs to be put somewhere else so that all possible uses of
@@ -76,6 +102,22 @@ class base::os::debian {
       content => template('base/os/preferences/backports.erb');
   }
 
+  if ($apt_cache_notin_tmp) {
+    # If we did NOT override the apt cache directory make sure that
+    # '/var/cache/apt/tmp' exists.
+    if ($apt_cache_tmp_dir == '/var/cache/apt/tmp') {
+      file { $apt_cache_tmp_dir:
+        ensure  => directory,
+        require => Package['apt'],
+      }
+    }
+
+    file { '/etc/apt/preferences.d/apt_cache_tmp':
+      content => template('base/os/etc/apt/preferences.d/apt_cache_tmp.erb'),
+      require => File[$apt_cache_tmp_dir],
+    }
+  }
+
   # lsb-release pulls in all of lsb unless we disable recommends handling
   # first, so make sure that we've done that.  That should be handled by the
   # global Package require set above.
@@ -119,7 +161,7 @@ class base::os::debian {
     'wheezy': { package { 'emacs23-nox': ensure => present } }
     'jessie': { package { 'emacs24-nox': ensure => present } }
   }
-  
+
   # Ensure this file exists, containing only a comment.
   file { '/etc/default/locale':
     ensure  => present,

templates/os/etc/apt/preferences.d/apt_cache_tmp.erb

+APT::ExtractTemplates::TempDir "<%= @apt_cache_tmp_dir %>";