fix: catch ManuallyLockedException and use app context

The files_lock app may throw ManuallyLockedExceptions
when attempting to revert a file that is currently opened.
This would prevent the user from rolling back a opened file.

Text and Richdocuments handle changes of the file while editing.
Allow reverting files even when they are locked by these apps
and let the apps handle the conflict.

Signed-off-by: Max <[email protected]>

Author: max-nextcloud

apps/files_versions/lib/Storage.php

@@ -436,24 +436,26 @@ private static function copyFileContents($view, $path1, $path2) {
 		$view->lockFile($path1, ILockingProvider::LOCK_EXCLUSIVE);
 		$view->lockFile($path2, ILockingProvider::LOCK_EXCLUSIVE);
 
-		// TODO add a proper way of overwriting a file while maintaining file ids
-		if ($storage1->instanceOfStorage('\OC\Files\ObjectStore\ObjectStoreStorage') || $storage2->instanceOfStorage('\OC\Files\ObjectStore\ObjectStoreStorage')) {
-			$source = $storage1->fopen($internalPath1, 'r');
-			$target = $storage2->fopen($internalPath2, 'w');
-			[, $result] = \OC_Helper::streamCopy($source, $target);
-			fclose($source);
-			fclose($target);
-
-			if ($result !== false) {
-				$storage1->unlink($internalPath1);
+		try {
+			// TODO add a proper way of overwriting a file while maintaining file ids
+			if ($storage1->instanceOfStorage('\OC\Files\ObjectStore\ObjectStoreStorage') || $storage2->instanceOfStorage('\OC\Files\ObjectStore\ObjectStoreStorage')) {
+				$source = $storage1->fopen($internalPath1, 'r');
+				$target = $storage2->fopen($internalPath2, 'w');
+				[, $result] = \OC_Helper::streamCopy($source, $target);
+				fclose($source);
+				fclose($target);
+
+				if ($result !== false) {
+					$storage1->unlink($internalPath1);
+				}
+			} else {
+				$result = $storage2->moveFromStorage($storage1, $internalPath1, $internalPath2);
 			}
-		} else {
-			$result = $storage2->moveFromStorage($storage1, $internalPath1, $internalPath2);
+		} finally {
+			$view->unlockFile($path1, ILockingProvider::LOCK_EXCLUSIVE);
+			$view->unlockFile($path2, ILockingProvider::LOCK_EXCLUSIVE);
 		}
 
-		$view->unlockFile($path1, ILockingProvider::LOCK_EXCLUSIVE);
-		$view->unlockFile($path2, ILockingProvider::LOCK_EXCLUSIVE);
-
 		return ($result !== false);
 	}
 

apps/files_versions/lib/Versions/VersionManager.php

@@ -27,8 +27,13 @@
 
 use OCP\Files\File;
 use OCP\Files\FileInfo;
+use OCP\Files\IRootFolder;
+use OCP\Files\Lock\ILock;
+use OCP\Files\Lock\ILockManager;
+use OCP\Files\Lock\LockContext;
 use OCP\Files\Storage\IStorage;
 use OCP\IUser;
+use OCP\Lock\ManuallyLockedException;
 
 class VersionManager implements IVersionManager {
 	/** @var (IVersionBackend[])[] */