From 91732eee5578d96937c43d70ff5dd16565fcf9f8 Mon Sep 17 00:00:00 2001
From: James Ho <james.ho@cbsinteractive.com>
Date: Tue, 17 Sep 2019 14:30:31 +0100
Subject: [PATCH] 8330 Correct issue where permission umask of files were not
 set when archiving in zip format with ZipArchiver

---
 src/Composer/Package/Archiver/ZipArchiver.php | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/src/Composer/Package/Archiver/ZipArchiver.php b/src/Composer/Package/Archiver/ZipArchiver.php
index 65694cb88..b6cfaf73f 100644
--- a/src/Composer/Package/Archiver/ZipArchiver.php
+++ b/src/Composer/Package/Archiver/ZipArchiver.php
@@ -45,6 +45,18 @@ class ZipArchiver implements ArchiverInterface
                 } else {
                     $zip->addFile($filepath, $localname);
                 }
+
+                /**
+                 * ZipArchive::setExternalAttributesName is available from >= PHP 5.6
+                 */
+                if (PHP_VERSION_ID >= 50600) {
+                    $perms = fileperms($filepath);
+
+                    /**
+                     * Ensure to preserve the permission umasks for the filepath in the archive.
+                     */
+                    $zip->setExternalAttributesName($localname, ZipArchive::OPSYS_UNIX, $perms << 16);
+                }
             }
             if ($zip->close()) {
                 return $target;