coordination: Allow disabling management of backend package

... which is already implemented in other resources like oslo::cache.

Change-Id: I459b7b752a83f75b1cb05c2104812133039a9162

manifests/coordination.pp

@@ -8,6 +8,10 @@
 #   (Optional) Coordination backend URL.
 #   Defaults to $::os_service_default
 #
+# [*manage_backend_package*]
+#   (Optional) Whether to install the backend package.
+#   Defaults to true.
+#
 # [*package_ensure*]
 #   (Optional) ensure state for package.
 #   Defaults to 'present'
@@ -17,14 +21,15 @@
 #   Defaults to true.
 #
 define oslo::coordination (
-  $backend_url    = $::os_service_default,
-  $package_ensure = 'present',
-  $manage_config  = true,
+  $backend_url            = $::os_service_default,
+  $manage_backend_package = true,
+  $package_ensure         = 'present',
+  $manage_config          = true,
 ) {
 
   include oslo::params
 
-  if !is_service_default($backend_url) {
+  if $manage_backend_package and !is_service_default($backend_url){
     case $backend_url {
       /^redis:\/\//: {
         ensure_packages('python-redis', {

releasenotes/notes/coordination-manage_backend_package-d6cc78682827d2df.yaml

@@ -0,0 +1,5 @@
+---
+features:
+  - |
+    The ``oslo::coordination::manage_backend_package`` parameter has been
+    added.

spec/defines/oslo_coordination_spec.rb

@@ -26,6 +26,18 @@ describe 'oslo::coordination' do
           :tag    => 'openstack',
         )
       end
+
+      context 'with backend package management disabled' do
+        before do
+          params.merge!({
+            :manage_backend_package => false,
+          })
+        end
+
+        it 'does not install backend package' do
+          is_expected.to_not contain_package('python-redis')
+        end
+      end
     end
 
     context 'with etcd3 backend' do
@@ -46,6 +58,18 @@ describe 'oslo::coordination' do
           is_expected.to_not contain_package('python-etcd3')
         end
       end
+
+      context 'with backend package management disabled' do
+        before do
+          params.merge!({
+            :manage_backend_package => false,
+          })
+        end
+
+        it 'does not install backend package' do
+          is_expected.to_not contain_package('python-etcd3')
+        end
+      end
     end
 
     context 'with etcd3gw backend(http)' do
@@ -57,6 +81,18 @@ describe 'oslo::coordination' do
         is_expected.to contain_keystone_config('coordination/backend_url').with_value('etcd3+http://localhost:2379')
         is_expected.to contain_package('python-etcd3gw')
       end
+
+      context 'with backend package management disabled' do
+        before do
+          params.merge!({
+            :manage_backend_package => false,
+          })
+        end
+
+        it 'does not install backend package' do
+          is_expected.to_not contain_package('python-etcd3gw')
+        end
+      end
     end
 
     context 'with etcd3gw backend(https)' do
@@ -68,6 +104,18 @@ describe 'oslo::coordination' do
         is_expected.to contain_keystone_config('coordination/backend_url').with_value('etcd3+https://localhost:2379')
         is_expected.to contain_package('python-etcd3gw')
       end
+
+      context 'with backend package management disabled' do
+        before do
+          params.merge!({
+            :manage_backend_package => false,
+          })
+        end
+
+        it 'does not install backend package' do
+          is_expected.to_not contain_package('python-etcd3gw')
+        end
+      end
     end
 
     context 'with memcache backend' do
@@ -84,6 +132,18 @@ describe 'oslo::coordination' do
           :tag    => 'openstack',
         )
       end
+
+      context 'with backend package management disabled' do
+        before do
+          params.merge!({
+            :manage_backend_package => false,
+          })
+        end
+
+        it 'does not install backend package' do
+          is_expected.to_not contain_package('python-pymemcache')
+        end
+      end
     end
 
     context 'with configuration management disabled' do