fix: fix unjailedroot of nested jails if there are other wrappers in betweenbackport/52775/stable29

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

[skip ci]

1 files changed, 7 insertions, 4 deletions

diff --git a/lib/private/Files/Cache/Wrapper/CacheJail.php b/lib/private/Files/Cache/Wrapper/CacheJail.php
index 3ad0d7a0a35..c6700932779 100644
--- a/lib/private/Files/Cache/Wrapper/CacheJail.php
+++ b/lib/private/Files/Cache/Wrapper/CacheJail.php
@@ -55,10 +55,13 @@ class CacheJail extends CacheWrapper {
 		parent::__construct($cache, $dependencies);
 		$this->root = $root;
 
-		if ($cache instanceof CacheJail) {
-			$this->unjailedRoot = $cache->getSourcePath($root);
-		} else {
-			$this->unjailedRoot = $root;
+		$this->unjailedRoot = $root;
+		$parent = $cache;
+		while ($parent instanceof CacheWrapper) {
+			if ($parent instanceof CacheJail) {
+				$this->unjailedRoot = $parent->getSourcePath($this->unjailedRoot);
+			}
+			$parent = $parent->getCache();
 		}
 	}