ensure home storage is initialized on first setup

Signed-off-by: Robin Appelman <robin@icewind.nl>

lib/private/Files/Filesystem.php

@@ -437,6 +437,10 @@ class Filesystem {
 
 			// home mounts are handled seperate since we need to ensure this is mounted before we call the other mount providers
 			$homeMount = $mountConfigManager->getHomeMountForUser($userObject);
+			if ($homeMount->getStorageRootId() === -1) {
+				$homeMount->getStorage()->mkdir('');
+				$homeMount->getStorage()->getScanner()->scan('');
+			}
 
 			self::getMountManager()->addMount($homeMount);
 

lib/private/Files/Mount/LocalHomeMountProvider.php

@@ -35,7 +35,7 @@ class LocalHomeMountProvider implements IHomeMountProvider {
 	 *
 	 * @param IUser $user
 	 * @param IStorageFactory $loader
-	 * @return \OCP\Files\Mount\IMountPoint[]
+	 * @return \OCP\Files\Mount\IMountPoint|null
 	 */
 	public function getHomeMountForUser(IUser $user, IStorageFactory $loader) {
 		$arguments = ['user' => $user];

lib/private/Files/Mount/MountPoint.php

@@ -268,7 +268,7 @@ class MountPoint implements IMountPoint {
 	 * @return int
 	 */
 	public function getStorageRootId() {
-		if (is_null($this->rootId)) {
+		if (is_null($this->rootId) || $this->rootId === -1) {
 			$this->rootId = (int)$this->getStorage()->getCache()->getId('');
 		}
 		return $this->rootId;