Added nova patching configuration parameters

These parameters are available in nova.conf, but were not
configurable using puppet-nova. The monkey patching parameters
allow patching a decorator for all functions in specified modules.
This change create patch/config.pp file to make these parameters
configurable.

Change-Id: I51ef3e19daff1d98cfe5c2c16475c16e6a3e3e0f
Closes-Bug: #1710292

manifests/patch/config.pp

@@ -0,0 +1,28 @@
+# == Class: nova:patch::config
+#
+# This class is aim to configure nova.patch parameters
+#
+# === Parameters:
+#
+# [*monkey_patch*]
+#   (optional) Apply monkey patching or not
+#   Defaults to false
+#
+# [*monkey_patch_modules*]
+#   (optional) List of modules/decorators to monkey patch
+#   Defaults to $::os_service_default
+#
+class nova::patch::config (
+  $monkey_patch                        = false,
+  $monkey_patch_modules                = $::os_service_default,
+) {
+
+  include ::nova::deps
+
+  $monkey_patch_modules_real = pick(join(any2array($monkey_patch_modules), ','), $::os_service_default)
+
+  nova_config {
+    'DEFAULT/monkey_patch':         value => $monkey_patch;
+    'DEFAULT/monkey_patch_modules': value => $monkey_patch_modules_real;
+  }
+}

releasenotes/notes/add-patch-config-407a53a9bb59e86c.yaml

@@ -0,0 +1,6 @@
+---
+features:
+  - Added nova patching configuration parameters. These parameters are available
+    in nova.conf, but are not configurable using puppet-nova. The monkey patching
+    parameters allow patching a decorator for all functions in specified modules.
+    This change create patch/config.pp file to make these parameters configurable.

spec/classes/nova_patch_config_spec.rb

@@ -0,0 +1,53 @@
+require 'spec_helper'
+
+describe 'nova::patch::config' do
+
+  let :params do
+    {}
+  end
+
+  shared_examples 'nova::patch::config' do
+
+    it { is_expected.to contain_class('nova::deps') }
+
+    context 'with default parameters' do
+      it { is_expected.to contain_nova_config('DEFAULT/monkey_patch').with_value('false') }
+      it { is_expected.to contain_nova_config('DEFAULT/monkey_patch_modules').with(:value => '<SERVICE DEFAULT>') }
+    end
+
+    context 'when overriding parameters' do
+      let :params do
+        { :monkey_patch         => true,
+          :monkey_patch_modules => ['nova.compute.api:nova.notifications.notify_decorator']
+        }
+      end
+
+      it { is_expected.to contain_nova_config('DEFAULT/monkey_patch').with_value('true') }
+      it { is_expected.to contain_nova_config('DEFAULT/monkey_patch_modules').with_value('nova.compute.api:nova.notifications.notify_decorator') }
+    end
+
+    context 'when overriding parameters with reset values' do
+      let :params do
+        { :monkey_patch         => false,
+          :monkey_patch_modules => '<SERVICE DEFAULT>'
+        }
+      end
+
+      it { is_expected.to contain_nova_config('DEFAULT/monkey_patch').with_value('false') }
+      it { is_expected.to contain_nova_config('DEFAULT/monkey_patch_modules').with(:value => '<SERVICE DEFAULT>') }
+    end
+  end
+
+  on_supported_os({
+    :supported_os => OSDefaults.get_supported_os
+  }).each do |os,facts|
+    context "on #{os}" do
+      let (:facts) do
+        facts.merge!(OSDefaults.get_facts())
+      end
+
+      it_configures 'nova::patch::config'
+    end
+  end
+
+end