/**
  * @param    string $siteTitle The name of the new site, will be used for both the file mount's name and the directory created in fileadmin.
  * @return    null|int    Returns null if the file mount could not be created, or the uid of the last inserted "sys_filemounts" record.
  */
 private function manageSysFileMounts($siteTitle)
 {
     $pathFirstPart = $this->getProcessSettings('path') ? $this->getProcessSettings('path') : self::$defaultPath;
     $pathFirstPart = substr($pathFirstPart, -1, 1) == '/' ? $pathFirstPart : $pathFirstPart . '/';
     $folderPath = $pathFirstPart . GeneralUtility::strtolower($siteTitle);
     $folderPath = Core::formatAccentsInString($folderPath);
     $folderPath = preg_replace('/\\s+/', ' ', $folderPath);
     $folderPath = preg_replace('/\\s/', '_', $folderPath);
     $folderPath = '/' . $folderPath . '/';
     // @todo: manage warning when overriding a folder?
     GeneralUtility::mkdir_deep(PATH_site . 'fileadmin' . $folderPath);
     /** @var FileMount $fileMount */
     $fileMount = GeneralUtility::makeInstance(FileMount::class);
     $fileMount->setPath($folderPath);
     $fileMount->setTitle($siteTitle);
     $fileMount->setIsAbsolutePath(true);
     // @todo: seems it must be on pid=0, check?
     $fileMount->setPid(0);
     /** @var PersistenceManager $persistenceManager */
     $persistenceManager = $this->objectManager->get(PersistenceManager::class);
     $persistenceManager->add($fileMount);
     $persistenceManager->persistAll();
     return $fileMount->getUid();
 }