Allow usage of file templates with stdlib::manage

manifests/manage.pp

@@ -10,31 +10,54 @@
 #
 # @param create_resources
 #   A hash of resources to create
-#   NOTE: functions, such as `template` or `epp`, are not evaluated.
+#   NOTE: functions, such as `template` or `epp`, are not directly evaluated
+#         but processed as Puppet code based on epp and erb hash keys.
 #
 # @example
 #   class { 'stdlib::manage':
-#       'create_resources' => {
-#         'file' => {
-#           '/etc/motd.d/hello' => {
-#             'content' => 'I say Hi',
-#             'notify' => 'Service[sshd]',
+#     'create_resources'      => {
+#       'file'                => {
+#         '/etc/motd.d/hello' => {
+#           'content'         => 'I say Hi',
+#           'notify'          => 'Service[sshd]',
+#         },
+#         '/etc/motd'         => {
+#           'ensure'          => 'file',
+#           'epp'             => {
+#             'template'      => 'profile/motd.epp',
 #           }
 #         },
-#         'package' => {
-#           'example' => {
-#             'ensure' => 'installed',
-#             'subscribe' => ['Service[sshd]', 'Exec[something]'],
+#         '/etc/information'  => {
+#           'ensure'          => 'file',
+#           'erb'             => {
+#             'template'      => 'profile/informaiton.erb',
 #           }
 #         }
+#       },
+#       'package'             => {
+#         'example'           => {
+#           'ensure'          => 'installed',
+#           'subscribe'       => ['Service[sshd]', 'Exec[something]'],
+#         }
 #       }
+#     }
+#   }
 #
 # @example
 #   stdlib::manage::create_resources:
 #     file:
 #       '/etc/motd.d/hello':
 #         content: I say Hi
 #         notify: 'Service[sshd]'
+#       '/etc/motd':
+#         ensure: 'file'
+#         epp:
+#           template: 'profile/motd.epp'
+#           context: {}
+#       '/etc/information':
+#         ensure: 'file'
+#         erb:
+#           template: 'profile/information.erb'
 #     package:
 #       example:
 #         ensure: installed
@@ -46,7 +69,50 @@
 ) {
   $create_resources.each |$type, $resources| {
     $resources.each |$title, $attributes| {
-      create_resources($type, { $title => $attributes })
+      case $type {
+        'file': {
+          # sanity checks
+          # epp, erb and content are exclusive
+          if 'epp' in $attributes and 'content' in $attributes {
+            fail("You can not set 'epp' and 'content' for file ${title}")
+          }
+          if 'erb' in $attributes and 'content' in $attributes {
+            fail("You can not set 'erb' and 'content' for file ${title}")
+          }
+          if 'erb' in $attributes and 'epp' in $attributes {
+            fail("You can not set 'erb' and 'epp' for file ${title}")
+          }
+
+          if 'epp' in $attributes {
+            if 'template' in $attributes['epp'] {
+              if 'context' in $attributes['epp'] {
+                $content = epp($attributes['epp']['template'], $attributes['epp']['context'])
+              } else {
+                $content = epp($attributes['epp']['template'])
+              }
+            } else {
+              fail("No template configured for epp for file ${title}")
+            }
+          } elsif 'erb' in $attributes {
+            if 'template' in $attributes['erb'] {
+              $content = template($attributes['erb']['template'])
+            } else {
+              fail("No template configured for erb for file ${title}")
+            }
+          } elsif 'content' in $attributes {
+            $content = $attributes['content']
+          } else {
+            $content = undef
+          }
+          file { $title:
+            *       => $attributes - 'erb' - 'epp' - 'content',
+            content => $content,
+          }
+        }
+        default: {
+          create_resources($type, { $title => $attributes })
+        }
+      }
     }
   }
 }

spec/classes/manage_spec.rb

@@ -25,6 +25,16 @@
             '/etc/motd.d/hello' => {
               'content' => 'I say Hi',
               'notify' => 'Service[sshd]'
+            },
+            '/etc/motd' => {
+              'epp' => {
+                'template' => 'profile/motd.epp'
+              }
+            },
+            '/etc/information' => {
+              'erb' => {
+                'template' => 'profile/information.erb'
+              }
             }
           },
           'package' => {
@@ -37,8 +47,17 @@
       }
     end
 
+    Puppet::Functions.create_function(:epp) do
+      return 'I am an epp template'
+    end
+    Puppet::Functions.create_function(:template) do
+      return 'I am an erb template'
+    end
+
     it { is_expected.to compile }
     it { is_expected.to contain_file('/etc/motd.d/hello').with_content('I say Hi').with_notify('Service[sshd]') }
+    it { is_expected.to contain_file('/etc/motd').with_content(%r{I am an epp template}) }
+    it { is_expected.to contain_file('/etc/information').with_content(%r{I am an erb template}) }
     it { is_expected.to contain_package('example').with_ensure('installed').that_subscribes_to(['Service[sshd]', 'File[/etc/motd.d]']) }
   end
 end