bug #32138 [Filesystem] fix mirroring directory into parent directory…

… (xabbuh)

This PR was merged into the 4.3 branch.

Discussion
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[Filesystem] fix mirroring directory into parent directory

| Q             | A
| ------------- | ---
| Branch?       | 4.3
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #32089
| License       | MIT
| Doc PR        |

Commits
-------

b58a806 fix mirroring directory into parent directory

src/Symfony/Component/Filesystem/Filesystem.php

@@ -569,14 +569,15 @@ public function mirror($originDir, $targetDir, \Traversable $iterator = null, $o
         }
 
         $this->mkdir($targetDir);
-        $targetDirInfo = new \SplFileInfo($targetDir);
+        $filesCreatedWhileMirroring = [];
 
         foreach ($iterator as $file) {
-            if ($file->getPathname() === $targetDir || $file->getRealPath() === $targetDir || 0 === strpos($file->getRealPath(), $targetDirInfo->getRealPath())) {
+            if ($file->getPathname() === $targetDir || $file->getRealPath() === $targetDir || isset($filesCreatedWhileMirroring[$file->getRealPath()])) {
                 continue;
             }
 
             $target = $targetDir.substr($file->getPathname(), $originDirLen);
+            $filesCreatedWhileMirroring[$target] = true;
 
             if (!$copyOnWindows && is_link($file)) {
                 $this->symlink($file->getLinkTarget(), $target);