Add scheduler_driver parameter to nova::scheduler class

Support setting the scheduler_driver configuration parameter
for nova-scheduler.

Change-Id: Ie8afbbd0f0d312b2a2b55dd160cc0224d7139ba7

manifests/scheduler.pp

@@ -16,10 +16,15 @@
 #   (optional) The state of the scheduler package
 #   Defaults to 'present'
 #
+# [*scheduler_driver*]
+#   (optional) Default driver to use for the scheduler
+#   Defaults to 'nova.scheduler.host_manager.HostManager'
+#
 class nova::scheduler(
-  $enabled        = false,
-  $manage_service = true,
-  $ensure_package = 'present'
+  $enabled          = false,
+  $manage_service   = true,
+  $ensure_package   = 'present',
+  $scheduler_driver = 'nova.scheduler.host_manager.HostManager',
 ) {
 
   include ::nova::db
@@ -33,4 +38,10 @@ class nova::scheduler(
     ensure_package => $ensure_package,
   }
 
+  nova_config {
+    'DEFAULT/scheduler_driver': value => $scheduler_driver;
+  }
+
+  Nova_config['DEFAULT/scheduler_driver'] ~> Service <| title == 'nova-scheduler' |>
+
 }

spec/classes/nova_scheduler_spec.rb

@@ -24,6 +24,8 @@ describe 'nova::scheduler' do
       :ensure    => 'running'
     )}
 
+    it { is_expected.to contain_nova_config('DEFAULT/scheduler_driver').with_value('nova.scheduler.host_manager.HostManager') }
+
     context 'with manage_service as false' do
       let :params do
         { :enabled        => true,
@@ -43,6 +45,14 @@ describe 'nova::scheduler' do
       )}
     end
 
+    context 'with scheduler driver' do
+      let :params do
+        { :scheduler_driver => 'custom driver' }
+      end
+
+      it { is_expected.to contain_nova_config('DEFAULT/scheduler_driver').with_value('custom driver') }
+    end
+
     context 'with default database parameters' do
       let :pre_condition do
         "include nova"