file_unmanaged_prepare

file_unmanaged_prepare($source, &$destination = NULL, $replace = FILE_EXISTS_RENAME)

function file_unmanaged_prepare($source, &$destination = NULL, $replace = FILE_EXISTS_RENAME) {
  $original_source = $source;
  $logger = \Drupal::logger('file');

  // Assert that the source file actually exists.
  if (!file_exists($source)) {
    // @todo Replace drupal_set_message() calls with exceptions instead.
    drupal_set_message(t('The specified file %file could not be moved/copied because no file by that name exists. Please check that you supplied the correct filename.', array('%file' => $original_source)), 'error');
    if (($realpath = drupal_realpath($original_source)) !== FALSE) {
      $logger->notice('File %file (%realpath) could not be moved/copied because it does not exist.', array('%file' => $original_source, '%realpath' => $realpath));
    }
    else {
      $logger->notice('File %file could not be moved/copied because it does not exist.', array('%file' => $original_source));
    }
    return FALSE;
  }

  // Build a destination URI if necessary.
  if (!isset($destination)) {
    $destination = file_build_uri(drupal_basename($source));
  }


  // Prepare the destination directory.
  if (file_prepare_directory($destination)) {
    // The destination is already a directory, so append the source basename.
    $destination = file_stream_wrapper_uri_normalize($destination . '/' . drupal_basename($source));
  }
  else {
    // Perhaps $destination is a dir/file?
    $dirname = drupal_dirname($destination);
    if (!file_prepare_directory($dirname)) {
      // The destination is not valid.
      $logger->notice('File %file could not be moved/copied because the destination directory %destination is not configured correctly.', array('%file' => $original_source, '%destination' => $dirname));
      drupal_set_message(t('The specified file %file could not be moved/copied because the destination directory is not properly configured. This may be caused by a problem with file or directory permissions. More information is available in the system log.', array('%file' => $original_source)), 'error');
      return FALSE;
    }
  }

  // Determine whether we can perform this operation based on overwrite rules.
  $destination = file_destination($destination, $replace);
  if ($destination === FALSE) {
    drupal_set_message(t('The file %file could not be moved/copied because a file by that name already exists in the destination directory.', array('%file' => $original_source)), 'error');
    $logger->notice('File %file could not be moved/copied because a file by that name already exists in the destination directory (%destination)', array('%file' => $original_source, '%destination' => $destination));
    return FALSE;
  }

  // Assert that the source and destination filenames are not the same.
  $real_source = drupal_realpath($source);
  $real_destination = drupal_realpath($destination);
  if ($source == $destination || ($real_source !== FALSE) && ($real_source == $real_destination)) {
    drupal_set_message(t('The specified file %file was not moved/copied because it would overwrite itself.', array('%file' => $source)), 'error');
    $logger->notice('File %file could not be moved/copied because it would overwrite itself.', array('%file' => $source));
    return FALSE;
  }
  // Make sure the .htaccess files are present.
  file_ensure_htaccess();
  return TRUE;
}