From c4f675fe847df5ffacd2e50a996c4925dc76e0bd Mon Sep 17 00:00:00 2001
From: Jordi Boggiano <j.boggiano@seld.be>
Date: Sun, 6 Jun 2021 21:11:48 +0200
Subject: [PATCH] Fix virtualbox filesystem issue when installing packages,
 fixes #9945

---
 src/Composer/Util/Filesystem.php | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/Composer/Util/Filesystem.php b/src/Composer/Util/Filesystem.php
index f1c8d38eb..766a76c92 100644
--- a/src/Composer/Util/Filesystem.php
+++ b/src/Composer/Util/Filesystem.php
@@ -229,6 +229,9 @@ class Filesystem
             }
         }
 
+        // release locks on the directory, see https://github.com/composer/composer/issues/9945
+        unset($ri, $it);
+
         return $this->rmdir($directory);
     }