Record that the installer is done, so it is not possible to run the installer on upgraded sites.

Related topics

File

drupal-6.x/modules/system/system.install, line 1451

Code

function system_update_6014() {
  variable_set('install_task', 'done');

  return array(array('success' => TRUE, 'query' => "variable_set('install_task')"));
}