Glance: add "local" backend

As an option, allow to configure Glance with "local" backend.
It is a option to use when not having Ceph in the environment.

For backward compatibility, we set 'rbd' as default backend.

Signed-off-by: Emilien Macchi <emilien.macchi@enovance.com>

manifests/image/api.pp

@@ -67,6 +67,11 @@
 #   (optional) Syslog facility to receive log lines
 #   Defaults to 'LOG_LOCAL0'
 #
+# [*backend*]
+#   (optionnal) Backend to use to store images
+#   Can be 'rbd' or 'file'.
+#   Defaults to 'rbd' to maintain backward compatibility
+#
 
 class cloud::image::api(
   $glance_db_host                    = '127.0.0.1',
@@ -88,7 +93,9 @@ class cloud::image::api(
   $verbose                           = true,
   $debug                             = true,
   $log_facility                      = 'LOG_LOCAL0',
-  $use_syslog                        = true
+  $use_syslog                        = true,
+  $backend                           = 'rbd',
+  $filesystem_store_datadir          = undef
 ) {
 
   # Disable twice logging if syslog is enabled
@@ -138,6 +145,7 @@ class cloud::image::api(
     'DEFAULT/notifier_driver':          value => 'noop';
   }
 
+  if ($backend == 'rbd') {
     class { 'glance::backend::rbd':
       rbd_store_user => $glance_rbd_user,
       rbd_store_pool => $glance_rbd_pool
@@ -152,6 +160,13 @@ class cloud::image::api(
       notify  => Service['glance-api','glance-registry']
     }
     Concat::Fragment <<| title == 'ceph-client-os' |>>
+  } elsif ($backend == 'file') {
+    class { 'glance::backend::file':
+      filesystem_store_datadir => $filesystem_store_datadir
+    }
+  } else {
+    fail("${backend} is not a Glance supported backend.")
+  }
 
   class { 'glance::cache::cleaner': }
   class { 'glance::cache::pruner': }

spec/classes/cloud_image_api_spec.rb

@@ -35,6 +35,7 @@ describe 'cloud::image::api' do
       :rabbit_password                   => 'secrete',
       :glance_rbd_user                   => 'glance',
       :glance_rbd_pool                   => 'images',
+      :backend                           => 'rbd',
       :debug                             => true,
       :verbose                           => true,
       :use_syslog                        => true,
@@ -92,6 +93,25 @@ describe 'cloud::image::api' do
       should contain_class('glance::cache::pruner')
     end
 
+    context 'with file Glance backend' do
+      before :each do
+        params.merge!(:backend => 'file')
+      end
+
+      it 'configure Glance with file backend' do
+        should contain_class('glance::backend::file')
+        should_not contain_class('glance::backend::rbd')
+        should contain_glance_api_config('DEFAULT/filesystem_store_datadir').with('value' => '/var/lib/glance/images/')
+        should contain_glance_api_config('DEFAULT/default_store').with('value' => 'file')
+      end
+    end
+
+    context 'with wrong Glance backend' do
+      before :each do
+        params.merge!(:backend => 'Something')
+      end
+      it { should compile.and_raise_error(/Something is not a Glance supported backend./) }
+    end
   end
 
   context 'on Debian platforms' do