multi-backend: configure default type

This patch aims to
- configure a default type in cinder-volume (without it, a volume can't
  boot without explicitly specifying a type from the client, which could
lead to errors)
- add unit tests for cinder::backends class

Change-Id: Ia0a475a629576596dd60e513bf0764e9bc3000ab
Signed-off-by: Emilien Macchi <emilien.macchi@enovance.com>

manifests/backends.pp

@@ -9,13 +9,32 @@
 #     This should contain names used in ceph::backend::* resources.
 #     Example: ['volume1', 'volume2', 'sata3']
 #
+# [*default_volume_type*]
+#   (optional) default volume type to use.
+#   This should contain the name of the default volume type to use.
+#   If not configured, it produces an error when creating a volume
+#   without specifying a type.
+#   Defaults to 'false'.
+#
 # Author: Andrew Woodward <awoodward@mirantis.com>
 class cinder::backends (
-  $enabled_backends = undef
+  $enabled_backends    = undef,
+  $default_volume_type = false
   ){
 
   # Maybe this could be extented to dynamicly find the enabled names
   cinder_config {
-    'DEFAULT/enabled_backends':         value => join($enabled_backends, ',');
+    'DEFAULT/enabled_backends': value => join($enabled_backends, ',');
   }
-}
+
+  if $default_volume_type {
+    cinder_config {
+      'DEFAULT/default_volume_type': value => $default_volume_type;
+    }
+  } else {
+    cinder_config {
+      'DEFAULT/default_volume_type': ensure => absent;
+    }
+  }
+
+}

spec/classes/cinder_backends_spec.rb

@@ -0,0 +1,84 @@
+#
+# Copyright (C) 2014 eNovance SAS <licensing@enovance.com>
+#
+# Author: Emilien Macchi <emilien.macchi@enovance.com>
+#
+# Licensed under the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License. You may obtain
+# a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+#
+# Unit tests for cinder::backends class
+#
+
+require 'spec_helper'
+
+describe 'cinder::backends' do
+
+  let :default_params do
+    {}
+  end
+
+  let :params do
+    {}
+  end
+
+  shared_examples_for 'cinder backends' do
+
+    let :p do
+      default_params.merge(params)
+    end
+
+    context 'configure cinder with default parameters' do
+      before :each do
+        params.merge!(
+         :enabled_backends => ['lowcost', 'regular', 'premium'],
+         :default_volume_type => false
+        )
+      end
+
+      it 'configures cinder.conf with default params' do
+        should contain_cinder_config('DEFAULT/enabled_backends').with_value(p[:enabled_backends].join(','))
+        should contain_cinder_config('DEFAULT/default_volume_type').with_ensure('absent')
+      end
+    end
+
+    context 'configure cinder with a default volume type' do
+      before :each do
+        params.merge!(
+         :enabled_backends => ['lowcost', 'regular', 'premium'],
+         :default_volume_type => 'regular'
+        )
+      end
+
+      it 'configures cinder.conf with default params' do
+        should contain_cinder_config('DEFAULT/default_volume_type').with_value('regular')
+      end
+    end
+
+  end
+
+  context 'on Debian platforms' do
+    let :facts do
+      { :osfamily => 'Debian' }
+    end
+
+    it_configures 'cinder backends'
+  end
+
+  context 'on RedHat platforms' do
+    let :facts do
+      { :osfamily => 'RedHat' }
+    end
+
+    it_configures 'cinder backends'
+  end
+
+end