update_clear_update_disk_cache

update_clear_update_disk_cache()

function update_clear_update_disk_cache() {
  // List of update module cache directories. Do not create the directories if
  // they do not exist.
  $directories = array(
    _update_manager_cache_directory(FALSE),
    _update_manager_extract_directory(FALSE),
  );

  // Search for files and directories in base folder only without recursion.
  foreach ($directories as $directory) {
    file_scan_directory($directory, '/.*/', array('callback' => 'update_delete_file_if_stale', 'recurse' => FALSE));
  }
}