Now all modules are in core modules folder

modules/node_clone/clone.api.php

@@ -0,0 +1,47 @@
+<?php
+
+/**
+ * @file
+ * API documentation for the Node clone module.
+ */
+
+/**
+ * Alter the node before saving a clone.
+ *
+ * @param $node
+ *   Reference to the fully loaded node object being saved (the clone) that
+ *   can be altered as needed.
+ * @param $original_node
+ *   A copy of the fully loaded node object being cloned (the original).
+ * @param $method
+ *   The cloning method which can be either 'prepopulate' or 'save-edit'.
+ *
+ * @see clone_node_save()
+ * @see drupal_alter()
+ */
+function hook_clone_node_alter(&$node, $original_node, $method) {
+  if ($original_node->type = 'special') {
+    $node->special = special_something();
+  }
+}
+
+/**
+ * Alter the access to the ability to clone a given node.
+ *
+ * @param bool $access
+ *   Reference to the boolean determining if cloning should be allowed on a
+ *   given node.
+ * @param $node
+ *   The fully loaded node object being considered for cloning.
+ *
+ * @see clone_access_cloning()
+ * @see drupal_alter()
+ */
+function hook_clone_access_alter(&$access, $node) {
+  global $user;
+  // Only allow cloning of nodes posted to groups you belong to.
+  // This function doesn't really exist, but you get the idea...
+  if (!og_user_is_member_of_group_the_node_is_in($user, $node)) {
+    $access = FALSE;
+  }
+}