[stable30] fix: don't use cached root info from shared cache if the watcher has detected an update

apps/files_sharing/lib/Cache.php

@@ -198,4 +198,8 @@ public function getCacheEntryFromSearchResult(ICacheEntry $rawEntry): ?ICacheEnt
 			return null;
 		}
 	}
+
+	public function markRootChanged(): void {
+		$this->rootUnchanged = false;
+	}
 }

apps/files_sharing/lib/SharedStorage.php

@@ -460,7 +460,12 @@
 			// for shares from the home storage we can rely on the home storage to keep itself up to date
 			// for other storages we need use the proper watcher
 			if (!(str_starts_with($storageId, 'home::') || str_starts_with($storageId, 'object::user'))) {
+				$cache = $this->getCache();
 				$this->watcher = parent::getWatcher($path, $storage);
+				if ($cache instanceof Cache && $this->watcher instanceof Watcher) {
+					$this->watcher->onUpdate([$cache, 'markRootChanged']);
+				}
+
 				return $this->watcher;
 			}
 		}

apps/files_sharing/tests/CacheTest.php

@@ -6,9 +6,12 @@
  */
 namespace OCA\Files_Sharing\Tests;
 
+use OC\Files\Filesystem;
 use OC\Files\Storage\Temporary;
 use OC\Files\Storage\Wrapper\Jail;
 use OCA\Files_Sharing\SharedStorage;
+use OCP\Constants;
+use OCP\Files\Cache\IWatcher;
 use OCP\Share\IShare;
 
 /**
@@ -564,4 +567,38 @@ public function testSearchShareJailedStorage() {
 		$results = $sharedStorage->getCache()->search("foo.txt");
 		$this->assertCount(1, $results);
 	}
+
+	public function testWatcherRootChange() {
+		$sourceStorage = new Temporary();
+		$sourceStorage->mkdir('shared');
+		$sourceStorage->file_put_contents('shared/foo.txt', 'foo');
+		$sourceStorage->getScanner()->scan('');
+		$sourceStorage->getWatcher()->setPolicy(IWatcher::CHECK_ALWAYS);
+		$this->registerMount(self::TEST_FILES_SHARING_API_USER1, $sourceStorage, '/' . self::TEST_FILES_SHARING_API_USER1 . '/files/foo');
+
+		self::loginHelper(self::TEST_FILES_SHARING_API_USER1);
+
+		$rootFolder = \OC::$server->getUserFolder(self::TEST_FILES_SHARING_API_USER1);
+		$node = $rootFolder->get('foo/shared');
+		$this->assertEquals(3, $node->getSize());
+
+		$share = $this->shareManager->newShare();
+		$share->setNode($node)
+			->setShareType(IShare::TYPE_USER)
+			->setSharedWith(self::TEST_FILES_SHARING_API_USER2)
+			->setSharedBy(self::TEST_FILES_SHARING_API_USER1)
+			->setPermissions(Constants::PERMISSION_ALL);
+		$share = $this->shareManager->createShare($share);
+		$share->setStatus(IShare::STATUS_ACCEPTED);
+		$this->shareManager->updateShare($share);
+		\OC_Util::tearDownFS();
+
+		self::loginHelper(self::TEST_FILES_SHARING_API_USER2);
+
+		$view = Filesystem::getView();
+
+		$sourceStorage->rmdir('shared');
+
+		$this->assertFalse($view->getFileInfo('shared'));
+	}
 }

lib/private/Files/Cache/Watcher.php

@@ -33,6 +33,9 @@ class Watcher implements IWatcher {
 	 */
 	protected $scanner;
 
+	/** @var callable[] */
+	protected $onUpdate = [];
+
 	/**
 	 * @param \OC\Files\Storage\Storage $storage
 	 */
@@ -100,6 +103,9 @@ public function update($path, $cachedData) {
 		if ($this->cache instanceof Cache) {
 			$this->cache->correctFolderSize($path);
 		}
+		foreach ($this->onUpdate as $callback) {
+			$callback($path);
+		}
 	}
 
 	/**
@@ -130,4 +136,11 @@ public function cleanFolder($path) {
 			}
 		}
 	}
+
+	/**
+	 * register a callback to be called whenever the watcher triggers and update
+	 */
+	public function onUpdate(callable $callback): void {
+		$this->onUpdate[] = $callback;
+	}
 }

lib/private/Files/Cache/Wrapper/JailWatcher.php

@@ -55,4 +55,7 @@ public function cleanFolder($path) {
 		$this->watcher->cleanFolder($this->getSourcePath($path));
 	}
 
+	public function onUpdate(callable $callback): void {
+		$this->watcher->onUpdate($callback);
+	}
 }