From 7649c8438da5db345fac9fa68b5029fc874f2325 Mon Sep 17 00:00:00 2001
From: Jordi Boggiano <j.boggiano@seld.be>
Date: Tue, 11 Aug 2020 09:42:16 +0200
Subject: [PATCH] Fix exception when using create-project in current directory,
 fixes #9073

---
 src/Composer/Downloader/ArchiveDownloader.php | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/src/Composer/Downloader/ArchiveDownloader.php b/src/Composer/Downloader/ArchiveDownloader.php
index 7cf19deee..ba19aa58b 100644
--- a/src/Composer/Downloader/ArchiveDownloader.php
+++ b/src/Composer/Downloader/ArchiveDownloader.php
@@ -46,10 +46,17 @@ abstract class ArchiveDownloader extends FileDownloader
             $this->io->writeError('Extracting archive', false);
         }
 
-        $this->filesystem->emptyDirectory($path);
+        $vendorDir = $this->config->get('vendor-dir');
+
+        // clean up the target directory, unless it contains the vendor dir, as the vendor dir contains
+        // the archive to be extracted. This is the case when installing with create-project in the current directory
+        // but in that case we ensure the directory is empty already in ProjectInstaller so no need to empty it here.
+        if (false === strpos($this->filesystem->normalizePath($vendorDir), $this->filesystem->normalizePath($path).DIRECTORY_SEPARATOR)) {
+            $this->filesystem->emptyDirectory($path);
+        }
 
         do {
-            $temporaryDir = $this->config->get('vendor-dir').'/composer/'.substr(md5(uniqid('', true)), 0, 8);
+            $temporaryDir = $vendorDir.'/composer/'.substr(md5(uniqid('', true)), 0, 8);
         } while (is_dir($temporaryDir));
 
         $this->addCleanupPath($package, $temporaryDir);