Add purge_config option

Add the option in order to facilitate management.
User can ensure that only the options they hoped
are configured.

Change-Id: I9106b9a5693e1d566a93b57888e675f2f7cb386c

manifests/init.pp

@@ -277,6 +277,11 @@
 #   Enable dbsync
 #   Defaults to true
 #
+# [*purge_config*]
+#   (optional) Whether to set only the specified config options
+#   in the ironic config.
+#   Defaults to false.
+#
 # DEPRECATED PARAMETERS
 #
 # [*rabbit_user*]
@@ -349,6 +354,7 @@ class ironic (
   $glance_num_retries                 = '0',
   $glance_api_insecure                = false,
   $sync_db                            = true,
+  $purge_config                       = false,
   # DEPRECATED PARAMETERS
   $rabbit_user                        = undef,
   $verbose                            = undef,
@@ -399,6 +405,10 @@ class ironic (
     )
   }
 
+  resources { 'ironic_config':
+    purge => $purge_config,
+  }
+
   if is_array($glance_api_servers) {
     ironic_config {
       'glance/glance_api_servers': value => join($glance_api_servers, ',');

spec/classes/ironic_init_spec.rb

@@ -32,7 +32,8 @@ describe 'ironic' do
       :database_reconnect_interval => 10,
       :database_retry_interval     => 10,
       :glance_num_retries          => 0,
-      :glance_api_insecure         => false
+      :glance_api_insecure         => false,
+      :purge_config                => false,
     }
   end
 
@@ -98,6 +99,12 @@ describe 'ironic' do
       )
     end
 
+    it 'passes purge to resource' do
+      is_expected.to contain_resources('ironic_config').with({
+        :purge => false
+      })
+    end
+
     it 'configures enabled_drivers' do
       is_expected.to contain_ironic_config('DEFAULT/enabled_drivers').with_value( params[:enabled_drivers] )
     end