try to naively implement a slave dns class, which is a failure so far

dns/bind/bind_service.inc

@@ -30,8 +30,32 @@ class provisionService_dns_bind extends provisionService_dns {
   }
 }
 
+class provisionService_dns_bind_slave extends provisionService_dns {
+  protected $application_name = 'bind';
+
+  protected $has_restart_cmd = TRUE;
+  
+  function default_restart_cmd() {
+    return provisionService_dns_bind::bind_default_restart_cmd();
+  }
+
+  function init_server() {
+    parent::init_server();
+    $this->server->setProperty('dns_master_server', null);
+    $this->configs['slave'][] = 'provisionConfig_bind_slave';
+  }
+
+  function parse_configs() {
+    $this->restart();
+  }
+
+}
+
 class provisionConfig_bind_zone extends provisionConfig_dns_zone {
 }
 
 class provisionConfig_bind_server extends provisionConfig_dns_server {
 }
+
+class provisionConfig_bind_slave extends provisionConfig_dns_server {
+}

dns/bind/slave.tpl.php

+<?php 
+foreach ($records as $key => $name) {
+  printf('zone "%s" { type slave; file "%s/%s.zone"; masters { %s; }; allow-query { any; }; };' . "\n", $name, $dns_zoned_path, $name, $master_server);
+}
+?>