Allow having mta send mail directly.

manifests/config.pp

@@ -9,7 +9,7 @@
 # === Parameters
 #
 # [*name*]   - name of the parameter.
-# [*ensure*] - present/absent. defaults to present.
+# [*ensure*] - present/absent/blank. defaults to present.
 # [*value*]  - value of the parameter.
 #
 # === Requires
@@ -23,12 +23,18 @@
 #     value  => 'yes',
 #   }
 #
-define postfix::config ($value, $ensure = present) {
+#   postfix::config { 'relayhost':
+#     ensure => 'blank',
+#   }
+#
+define postfix::config ($value = undef, $ensure = 'present') {
 
-  validate_string($value)
   validate_string($ensure)
-  validate_re($ensure, ['present', 'absent'],
-    "\$ensure must be either 'present' or 'absent', got '${ensure}'")
+  validate_re($ensure, ['present', 'absent', 'blank'],
+    "\$ensure must be either 'present', 'absent' or 'blank', got '${ensure}'")
+  if ($ensure == 'present') {
+    validate_string($value)
+  }
 
   if (!defined(Class['postfix'])) {
     fail 'You must define class postfix before using postfix::config!'
@@ -51,6 +57,11 @@ define postfix::config ($value, $ensure = present) {
         changes => "rm ${name}",
       }
     }
+    blank: {
+      augeas { "blank postfix '${name}'":
+        changes => "clear ${name}",
+      }
+    }
     default: {}
   }
 }

manifests/mta.pp

@@ -3,14 +3,16 @@
 # This class configures a minimal MTA, delivering mail to
 # $mydestination.
 #
-# A valid relay host is required ($relayhost) for outbound email.
+# Either a valid relay host or the special word 'direct' is required 
+# ($relayhost) for outbound email.
 #
 # transport & virtual maps get configured and can be populated with
 # postfix::transport and postfix::virtual
 #
 # === Parameters
 #
-# [*relayhost*]     - (string) the relayhost to use
+# [*relayhost*]     - (string) the relayhost to use or 'direct' to send mail
+#                     directly without a relay.
 # [*mydestination*] - (string)
 # [*mynetworks*]    - (string)
 #
@@ -36,10 +38,17 @@ class postfix::mta (
   validate_re($mynetworks, '^\S+$',
               'Wrong value for $mynetworks')
 
+  # If direct is specified then relayhost should be blank
+  if ($relayhost == 'direct') {
+    postfix::config { 'relayhost': ensure => 'blank' }
+  }
+  else {
+    postfix::config { 'relayhost': value => $relayhost }
+  }
+
   postfix::config {
     'mydestination':       value => $mydestination;
     'mynetworks':          value => $mynetworks;
-    'relayhost':           value => $relayhost;
     'virtual_alias_maps':  value => 'hash:/etc/postfix/virtual';
     'transport_maps':      value => 'hash:/etc/postfix/transport';
   }