Issue #3258048: Ensure the stage is marked as available even all stage directories can't be deleted

package_manager/src/Stage.php

@@ -292,9 +292,8 @@ class Stage {
     $parent_stage_dir = static::getStagingRoot();
     if (is_dir($parent_stage_dir)) {
       try {
-        $this->fileSystem->deleteRecursive($parent_stage_dir, function (string $path): void {
-          $this->fileSystem->chmod($path, 0777);
-        });
+        $callback = \Closure::fromCallable([$this, 'preFileDelete']);
+        $this->fileSystem->deleteRecursive($parent_stage_dir, $callback);
       }
       catch (FileException $e) {
         // Deliberately swallow the exception so that the stage will be marked
@@ -307,6 +306,16 @@ class Stage {
     $this->dispatch(new PostDestroyEvent($this));
   }
 
+  /**
+   * Callback for \Drupal\Core\File\FileSystemInterface::deleteRecursive().
+   *
+   * @param string $path
+   *   The path of the file or directory that is about to be deleted.
+   */
+  protected function preFileDelete(string $path): void {
+    $this->fileSystem->chmod($path, 0777);
+  }
+
   /**
    * Marks the stage as available.
    */