delay getting the home dir of a user untill needed

for cache-only operations we don't actually need to know the home directory

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

lib/private/Files/Storage/Home.php

@@ -49,12 +49,24 @@ class Home extends Local implements \OCP\Files\IHomeStorage {
 	 */
 	public function __construct($arguments) {
 		$this->user = $arguments['user'];
-		$datadir = $this->user->getHome();
 		$this->id = 'home::' . $this->user->getUID();
 
-		parent::__construct(['datadir' => $datadir]);
+		// use a placeholder datadir until we actually need to caluclate a source path
+		//
+		// this allows using this storage with a LazyUser without having to get the real user
+		// as long as only cache operations are done
+		parent::__construct(['datadir' => '/tmp/empty/placeholder/']);
 	}
 
+	public function getSourcePath($path) {
+		if ($this->datadir == '/tmp/empty/placeholder/') {
+			$this->setDataDir($this->user->getHome());
+		}
+
+		return parent::getSourcePath($path);
+	}
+
+
 	public function getId() {
 		return $this->id;
 	}

lib/private/Files/Storage/Local.php

@@ -75,7 +75,18 @@ class Local extends \OC\Files\Storage\Common {
 		if (!isset($arguments['datadir']) || !is_string($arguments['datadir'])) {
 			throw new \InvalidArgumentException('No data directory set for local storage');
 		}
-		$this->datadir = str_replace('//', '/', $arguments['datadir']);
+
+		$this->setDataDir($arguments['datadir']);
+		$this->config = \OC::$server->get(IConfig::class);
+		$this->mimeTypeDetector = \OC::$server->get(IMimeTypeDetector::class);
+		$this->defUMask = $this->config->getSystemValue('localstorage.umask', 0022);
+
+		// support Write-Once-Read-Many file systems
+		$this->unlinkOnTruncate = $this->config->getSystemValue('localstorage.unlink_on_truncate', false);
+	}
+
+	protected function setDataDir(string $dataDir) {
+		$this->datadir = str_replace('//', '/', $dataDir);
 		// some crazy code uses a local storage on root...
 		if ($this->datadir === '/') {
 			$this->realDataDir = $this->datadir;
@@ -87,12 +98,6 @@ class Local extends \OC\Files\Storage\Common {
 			$this->datadir .= '/';
 		}
 		$this->dataDirLength = strlen($this->realDataDir);
-		$this->config = \OC::$server->get(IConfig::class);
-		$this->mimeTypeDetector = \OC::$server->get(IMimeTypeDetector::class);
-		$this->defUMask = $this->config->getSystemValue('localstorage.umask', 0022);
-
-		// support Write-Once-Read-Many file systems
-		$this->unlinkOnTruncate = $this->config->getSystemValue('localstorage.unlink_on_truncate', false);
 	}
 
 	public function __destruct() {