Piwik\Filesystem::realpath PHP Method

    public static function realpath($path)
    {
        if (file_exists($path)) {
            return realpath($path);
        }
        return $path;
    }

 public function execute()
 {
     $label = $this->translator->translate('CustomPiwikJs_DiagnosticPiwikJsWritable');
     $file = new File(PIWIK_DOCUMENT_ROOT . '/piwik.js');
     if ($file->hasWriteAccess()) {
         return array(DiagnosticResult::singleResult($label, DiagnosticResult::STATUS_OK, ''));
     }
     $comment = $this->translator->translate('CustomPiwikJs_DiagnosticPiwikJsNotWritable');
     if (!SettingsServer::isWindows()) {
         $realpath = Filesystem::realpath(PIWIK_INCLUDE_PATH . '/piwik.js');
         $command = "<br/><code> chmod +w {$realpath}<br/> chown " . Filechecks::getUserAndGroup() . " " . $realpath . "</code><br />";
         $comment .= $this->translator->translate('CustomPiwikJs_DiagnosticPiwikJsMakeWritable', $command);
     }
     return array(DiagnosticResult::singleResult($label, DiagnosticResult::STATUS_WARNING, $comment));
 }