update_manager_archive_extract

update_manager_archive_extract($file, $directory)

function update_manager_archive_extract($file, $directory) {
  $archiver = archiver_get_archiver($file);
  if (!$archiver) {
    throw new Exception(t('Cannot extract %file, not a valid archive.', array('%file' => $file)));
  }

  // Remove the directory if it exists, otherwise it might contain a mixture of
  // old files mixed with the new files (e.g. in cases where files were removed
  // from a later release).
  $files = $archiver->listContents();

  // Unfortunately, we can only use the directory name to determine the project
  // name. Some archivers list the first file as the directory (i.e., MODULE/)
  // and others list an actual file (i.e., MODULE/README.TXT).
  $project = strtok($files[0], '/\\');

  $extract_location = $directory . '/' . $project;
  if (file_exists($extract_location)) {
    file_unmanaged_delete_recursive($extract_location);
  }

  $archiver->extract($directory);
  return $archiver;
}