Fix filesystem setup for shared public link with logged in user

apps/files_sharing/public.php

@@ -5,7 +5,6 @@ if (isset($_GET['file'])) {
 	$pos = strpos($_GET['file'], '/', 1);
 	$uidOwner = substr($_GET['file'], 1, $pos - 1);
 	if (OCP\User::userExists($uidOwner)) {
-		OC_Util::tearDownFS();
 		OC_Util::setupFS($uidOwner);
 		$file = substr($_GET['file'], $pos);
 		$fileSource = OC_Filecache::getId($_GET['file'], '');
@@ -73,4 +72,4 @@ if (isset($_GET['file'])) {
 }
 header('HTTP/1.0 404 Not Found');
 $tmpl = new OCP\Template('', '404', 'guest');
-$tmpl->printPage();
\ No newline at end of file
+$tmpl->printPage();

lib/util.php

@@ -19,6 +19,18 @@ class OC_Util {
 			return false;
 		}
 
+		// If we are not forced to load a specific user we load the one that is logged in
+		if( $user == "" && OC_User::isLoggedIn()){
+			$user = OC_User::getUser();
+		}
+
+		// the filesystem will finish when $user is not empty,
+		// mark fs setup here to avoid doing the setup from loading
+		// OC_Filesystem
+		if ($user != '') {
+			self::$fsSetup=true;
+		}
+
 		$CONFIG_DATADIRECTORY = OC_Config::getValue( "datadirectory", OC::$SERVERROOT."/data" );
 		//first set up the local "root" storage
 		if(!self::$rootMounted){
@@ -26,11 +38,6 @@ class OC_Util {
 			self::$rootMounted=true;
 		}
 
-		// If we are not forced to load a specific user we load the one that is logged in
-		if( $user == "" && OC_User::isLoggedIn()){
-			$user = OC_User::getUser();
-		}
-
 		if( $user != "" ){ //if we aren't logged in, there is no use to set up the filesystem
 			$user_dir = '/'.$user.'/files';
 			$user_root = OC_User::getHome($user);
@@ -43,7 +50,6 @@ class OC_Util {
 			OC_Filesystem::init($user_dir);
 			$quotaProxy=new OC_FileProxy_Quota();
 			OC_FileProxy::register($quotaProxy);
-			self::$fsSetup=true;
 			// Load personal mount config
 			if (is_file($user_root.'/mount.php')) {
 				$mountConfig = include($user_root.'/mount.php');