Merge pull request #33566 from nextcloud/fopen-not-found-rescan

trigger a rescan when trying to fopen a file that exists in cache but not on disk

1 files changed, 11 insertions, 1 deletions

diff --git a/lib/private/Files/View.php b/lib/private/Files/View.php
index 294912e698b..986aecf556f 100644
--- a/lib/private/Files/View.php
+++ b/lib/private/Files/View.php
@@ -1003,7 +1003,17 @@ class View {
 			$this->logger->info('Trying to open a file with a mode other than "r" or "w" can cause severe performance issues with some backends', ['app' => 'core']);
 		}
 
-		return $this->basicOperation('fopen', $path, $hooks, $mode);
+		$handle = $this->basicOperation('fopen', $path, $hooks, $mode);
+		if (!is_resource($handle) && $mode === 'r') {
+			// trying to read a file that isn't on disk, check if the cache is out of sync and rescan if needed
+			$mount = $this->getMount($path);
+			$internalPath = $mount->getInternalPath($this->getAbsolutePath($path));
+			$storage = $mount->getStorage();
+			if ($storage->getCache()->inCache($internalPath) && !$storage->file_exists($path)) {
+				$this->writeUpdate($storage, $internalPath);
+			}
+		}
+		return $handle;
 	}
 
 	/**