Merge pull request #4997 from nextcloud/federated-share-fix

fix for sharing

apps/files_sharing/lib/External/Manager.php

@@ -198,6 +198,7 @@ class Manager {
 		$share = $this->getShare($id);
 
 		if ($share) {
+			\OC_Util::setupFS($this->uid);
 			$mountPoint = Files::buildNotExistingFileName('/', $share['name']);
 			$mountPoint = Filesystem::normalizePath('/' . $mountPoint);
 			$hash = md5($mountPoint);