1 files changed, 25 insertions, 2 deletions
diff --git a/lib/private/files/fileinfo.php b/lib/private/files/fileinfo.php
index 2d2ef325d38..5b5e8697004 100644
--- a/lib/private/files/fileinfo.php
+++ b/lib/private/files/fileinfo.php
@@ -62,6 +62,11 @@ class FileInfo implements \OCP\Files\FileInfo, \ArrayAccess {
 	private $owner;
 
 	/**
+	 * @var string[]
+	 */
+	private $childEtags = [];
+
+	/**
 	 * @param string|boolean $path
 	 * @param Storage\Storage $storage
 	 * @param string $internalPath
@@ -93,6 +98,8 @@ class FileInfo implements \OCP\Files\FileInfo, \ArrayAccess {
 	public function offsetGet($offset) {
 		if ($offset === 'type') {
 			return $this->getType();
+		} else if ($offset === 'etag') {
+			return $this->getEtag();
 		} elseif (isset($this->data[$offset])) {
 			return $this->data[$offset];
 		} else {
@@ -153,7 +160,12 @@ class FileInfo implements \OCP\Files\FileInfo, \ArrayAccess {
 	 * @return string
 	 */
 	public function getEtag() {
-		return $this->data['etag'];
+		if (count($this->childEtags) > 0) {
+			$combinedEtag = $this->data['etag'] . '::' . implode('::', $this->childEtags);
+			return md5($combinedEtag);
+		} else {
+			return $this->data['etag'];
+		}
 	}
 
 	/**
@@ -292,8 +304,19 @@ class FileInfo implements \OCP\Files\FileInfo, \ArrayAccess {
 	 * Sets the size, etag and size to for cross-storage childs
 	 *
 	 * @param array $data cache entry for the child
+	 * @param string $entryPath full path of the child entry
 	 */
-	public function addSubEntry($data) {
+	public function addSubEntry($data, $entryPath) {
 		$this->data['size'] += isset($data['size']) ? $data['size'] : 0;
+		if (isset($data['mtime'])) {
+			$this->data['mtime'] = max($this->data['mtime'], $data['mtime']);
+		}
+		if (isset($data['etag'])) {
+			// prefix the etag with the relative path of the subentry to propagate etag on mount moves
+			$relativeEntryPath = substr($entryPath, strlen($this->getPath()));
+			// attach the permissions to propagate etag on permision changes of submounts
+			$permissions = isset($data['permissions']) ? $data['permissions'] : 0;
+			$this->childEtags[] = $relativeEntryPath . '/' . $data['etag'] . $permissions;
+		}
 	}
 }