also updated parent etags when a changed etag is detected during scanning

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

Author: icewind1991

lib/private/Files/Cache/Scanner.php

@@ -200,6 +200,7 @@ public function scanFile($file, $reuseExisting = 0, $parentId = -1, $cacheData =
 						$data['fileid'] = $fileId;
 						// only reuse data if the file hasn't explicitly changed
 						$mtimeUnchanged = isset($data['storage_mtime']) && isset($cacheData['storage_mtime']) && $data['storage_mtime'] === $cacheData['storage_mtime'];
+						// if the folder is marked as unscanned, never reuse etags
 						if ($mtimeUnchanged && $cacheData['size'] !== -1) {
 							$data['mtime'] = $cacheData['mtime'];
 							if (($reuseExisting & self::REUSE_SIZE) && ($data['size'] === -1)) {
@@ -217,6 +218,11 @@ public function scanFile($file, $reuseExisting = 0, $parentId = -1, $cacheData =
 
 						// Only update metadata that has changed
 						$newData = array_diff_assoc($data, $cacheData->getData());
+
+						// make it known to the caller that etag has been changed and needs propagation
+						if (isset($newData['etag'])) {
+							$data['etag_changed'] = true;
+						}
 					} else {
 						// we only updated unencrypted_size if it's already set
 						unset($data['unencrypted_size']);
@@ -380,7 +386,7 @@ protected function getExistingChildren($folderId) {
 	 * @param array $data the data of the folder before (re)scanning the children
 	 * @return int|float the size of the scanned folder or -1 if the size is unknown at this stage
 	 */
-	protected function scanChildren($path, $recursive = self::SCAN_RECURSIVE, $reuse = -1, $folderId = null, $lock = true, array $data = []) {
+	protected function scanChildren($path, $recursive = self::SCAN_RECURSIVE, $reuse = -1, $folderId = null, $lock = true, array $data = [], &$etagChanged = false) {
 		if ($reuse === -1) {
 			$reuse = ($recursive === self::SCAN_SHALLOW) ? self::REUSE_ETAG | self::REUSE_SIZE : self::REUSE_ETAG;
 		}
@@ -389,10 +395,14 @@ protected function scanChildren($path, $recursive = self::SCAN_RECURSIVE, $reuse
 		if (!is_null($folderId)) {
 			$folderId = $this->cache->getId($path);
 		}
-		$childQueue = $this->handleChildren($path, $recursive, $reuse, $folderId, $lock, $size);
+		$childQueue = $this->handleChildren($path, $recursive, $reuse, $folderId, $lock, $size, $etagChanged);
 
 		foreach ($childQueue as $child => $childId) {
-			$childSize = $this->scanChildren($child, $recursive, $reuse, $childId, $lock);
+			// "etag changed" propagates up, but not down, so we pass `false` to the children even if we already know that the etag of the current folder changed
+			$childEtagChanged = false;
+			$childSize = $this->scanChildren($child, $recursive, $reuse, $childId, $lock, [], $childEtagChanged);
+			$etagChanged |= $childEtagChanged;
+
 			if ($childSize === -1) {
 				$size = -1;
 			} elseif ($size !== -1) {
@@ -406,15 +416,24 @@ protected function scanChildren($path, $recursive = self::SCAN_RECURSIVE, $reuse
 		if ($this->storage->instanceOfStorage(Encryption::class)) {
 			$this->cache->calculateFolderSize($path);
 		} else {
-			if ($this->cacheActive && $oldSize !== $size) {
-				$this->cache->update($folderId, ['size' => $size]);
+			if ($this->cacheActive) {
+				$updatedData = [];
+				if ($oldSize !== $size) {
+					$updatedData['size'] = $size;
+				}
+				if ($etagChanged) {
+					$updatedData['etag'] = uniqid();
+				}
+				if ($updatedData) {
+					$this->cache->update($folderId, $updatedData);
+				}
 			}
 		}
 		$this->emit('\OC\Files\Cache\Scanner', 'postScanFolder', [$path, $this->storageId]);
 		return $size;
 	}
 
-	private function handleChildren($path, $recursive, $reuse, $folderId, $lock, &$size) {
+	private function handleChildren($path, $recursive, $reuse, $folderId, $lock, &$size, bool &$etagChanged) {
 		// we put this in it's own function so it cleans up the memory before we start recursing
 		$existingChildren = $this->getExistingChildren($folderId);
 		$newChildren = iterator_to_array($this->storage->getDirectoryContent($path));
@@ -462,6 +481,10 @@ private function handleChildren($path, $recursive, $reuse, $folderId, $lock, &$s
 					} elseif ($size !== -1) {
 						$size += $data['size'];
 					}
+
+					if (isset($data['etag_changed']) && $data['etag_changed']) {
+						$etagChanged = true;
+					}
 				}
 			} catch (Exception $ex) {
 				// might happen if inserting duplicate while a scanning