add factory for dropin files

README.md

@@ -104,6 +104,17 @@ use `daemon_reload => 'eager'` instead of the default `'lazy'`.  Be aware that t
 reloaded multiple times if you have multiple `systemd::dropin_file` resources and any one of them
 is using `'eager'`.
 
+dropin-files can also be generated via hiera:
+
+```yaml
+
+systemd::dropin_files:
+  my-foo.conf:
+    unit: foo.service
+    source: puppet:///modules/${module_name}/foo.conf
+
+```
+
 ### tmpfiles
 
 Let this module handle file creation and systemd reloading

manifests/init.pp

@@ -81,6 +81,8 @@
 # @param logind_settings
 #   Config Hash that is used to configure settings in logind.conf
 #
+# @param drpoin_files
+#   Configure dropin files via hiera with factory pattern
 class systemd (
   Hash[String,Hash[String, Any]]                         $service_limits,
   Boolean                                                $manage_resolved,
@@ -108,6 +110,7 @@
   Systemd::JournaldSettings                              $journald_settings,
   Boolean                                                $manage_logind,
   Systemd::LogindSettings                                $logind_settings,
+  Hash                                                   $dropin_files = {},
 ){
 
   contain systemd::systemctl::daemon_reload
@@ -137,4 +140,10 @@
   if $manage_logind {
     contain systemd::logind
   }
+
+  $dropin_files.each |$name, $resource| {
+    systemd::dropin_file { $name:
+      * => $resource,
+    }
+  }
 }

spec/classes/init_spec.rb

@@ -294,6 +294,20 @@
             )
           }
         end
+        context 'when passing dropin_files' do
+          let(:params) do
+            {
+              dropin_files: {
+                'my-foo.conf' => {
+                  'unit'    => 'foo.service',
+                  'content' => '[Service]\nReadWritePaths=/',
+                },
+              },
+            }
+          end
+
+          it { is_expected.to contain_systemd__dropin_file('my-foo.conf').with_content('[Service]\nReadWritePaths=/') }
+        end
       end
     end
   end