by gaddman, izus, Indexing fails due to missing locale. See #3255205

    $java = $this->configuration['java_path'];

    // UTF-8 multibyte characters will be stripped by escapeshellargs() for the

    // default C-locale.

    // So temporarily set the locale to UTF-8 so that the filepath remains

    // valid.

    // So temporarily set the locale to UTF-8 if available so that the filepath

    // remains valid.

    // Attempt to use en_US.UTF-8 first, and fallback to C.UTF-8, since

    // en_US.UTF-8 is more widespread, while C.UTF-8 may be present otherwwise.

    $backup_locale = setlocale(LC_CTYPE, '0');

    setlocale(LC_CTYPE, 'en_US.UTF-8');

    $preferred_locales = ['en_US.UTF-8', 'C.UTF-8'];

    $new_locale = setlocale(LC_CTYPE, $preferred_locales) ?: $backup_locale;

    $param = '';

    if ($file->getMimeType() != 'audio/mpeg') {

      $param = ' -Dfile.encoding=UTF8 -cp ' . escapeshellarg($tika);

    }

    // Restore the locale.

    setlocale(LC_CTYPE, $backup_locale);

    // Support UTF-8 commands:

    // @see http://www.php.net/manual/en/function.shell-exec.php#85095

    shell_exec("LANG=en_US.utf-8");

    // Support UTF-8 encoded filenames

    $cmd = 'export LANG=' . $new_locale . '; ' . $cmd;

    $output = shell_exec($cmd);

    if (is_null($output)) {

      throw new \Exception('Tika Exctractor is not available.');

      throw new \Exception('Tika Extractor is not available.');

    }

    return $output;

  }