improve handling of files we can't access in the scanner

instead of erroring, remove the items from the cache.

this situation can be triggered if a user has access to a file but looses it afterwards

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

Author: icewind1991

apps/files_external/lib/Lib/Storage/SMB.php

@@ -191,13 +191,15 @@ protected function getFileInfo($path) {
 			return $this->statCache[$path];
 		} catch (ConnectException $e) {
 			$this->throwUnavailable($e);
+		} catch (NotFoundException $e) {
+			throw new \OCP\Files\NotFoundException($e->getMessage(), 0, $e);
 		} catch (ForbiddenException $e) {
 			// with php-smbclient, this exceptions is thrown when the provided password is invalid.
 			// Possible is also ForbiddenException with a different error code, so we check it.
 			if ($e->getCode() === 1) {
 				$this->throwUnavailable($e);
 			}
-			throw $e;
+			throw new \OCP\Files\ForbiddenException($e->getMessage(), false, $e);
 		}
 	}
 
@@ -276,6 +278,8 @@ protected function getFolderContents($path): iterable {
 		} catch (ConnectException $e) {
 			$this->logger->logException($e, ['message' => 'Error while getting folder content']);
 			throw new StorageNotAvailableException($e->getMessage(), $e->getCode(), $e);
+		} catch (NotFoundException $e) {
+			throw new \OCP\Files\NotFoundException($e->getMessage(), 0, $e);
 		}
 	}
 
@@ -714,6 +718,10 @@ public static function checkDependencies() {
 	public function test() {
 		try {
 			return parent::test();
+		} catch (StorageAuthException $e) {
+			return false;
+		} catch (ForbiddenException $e) {
+			return false;
 		} catch (Exception $e) {
 			$this->logger->logException($e);
 			return false;

lib/private/Files/Cache/Scanner.php

@@ -40,6 +40,7 @@
 use OC\Hooks\BasicEmitter;
 use OCP\Files\Cache\IScanner;
 use OCP\Files\ForbiddenException;
+use OCP\Files\NotFoundException;
 use OCP\ILogger;
 use OCP\Lock\ILockingProvider;
 
@@ -335,10 +336,15 @@ public function scan($path, $recursive = self::SCAN_RECURSIVE, $reuse = -1, $loc
 			}
 		}
 		try {
-			$data = $this->scanFile($path, $reuse, -1, null, $lock);
-			if ($data and $data['mimetype'] === 'httpd/unix-directory') {
-				$size = $this->scanChildren($path, $recursive, $reuse, $data['fileid'], $lock);
-				$data['size'] = $size;
+			try {
+				$data = $this->scanFile($path, $reuse, -1, null, $lock);
+				if ($data and $data['mimetype'] === 'httpd/unix-directory') {
+					$size = $this->scanChildren($path, $recursive, $reuse, $data['fileid'], $lock);
+					$data['size'] = $size;
+				}
+			} catch (NotFoundException $e) {
+				$this->removeFromCache($path);
+				return null;
 			}
 		} finally {
 			if ($lock) {