Index: og_mandatory_group.module
===================================================================
--- og_mandatory_group.module	(revision 300)
+++ og_mandatory_group.module	(revision 303)
@@ -97,3 +97,47 @@
     return $form;
   }
 }
+
+/** hook_menu **/
+function og_mandatory_group_menu($may_cache) {
+  $items = array();
+  $items[] = array(
+    'path' => 'admin/settings/og_mandatory_group/update_existing_users',
+    'title' => t('update existing users'),
+    'callback' => 'og_mandatory_group_update_existing_users_form',
+    'access' => user_access('access administration pages'),
+    'type' => MENU_NORMAL_ITEM,
+    );
+  return $items;
+}
+
+function og_mandatory_group_update_existing_users_form() {
+// note,currently this does not email the group admin
+$output = '';
+  $form['desc1'] = array(
+    '#value' => t('Click Update to retro-actively place existing users into current mandatory groups.<br/>
+                   Note, unchecking groups in og_mandatory_groups and then pressing Update will not
+                   remove users from groups, so use this sparingly.<br/>'),
+  );
+  $form['submit'] = array('#type' => 'submit', '#value' => t('Update'));
+
+  $output .= drupal_get_form('og_mandatory_group_update_existing_users_form',$form);
+  return $output;
+}
+
+function og_mandatory_group_update_existing_users_form_submit() {
+  $output = '';
+  $result = db_query("select uid from users where uid > 0");
+  $count = db_num_rows($result);
+  $groups = variable_get('og_mandatory_group',array());
+  while($user = db_fetch_array($result)){
+    foreach($groups as $group){
+      // og handles duplicates for us
+      og_save_subscription($group, $user['uid'], array('is_active' => 1));
+    }
+  }
+  
+  drupal_set_message("$count users updated",'status');
+  $output .= t("All existing users now belong to the current Mandatory Groups");
+  print theme('page',$output);
+}
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