From c24f058fd65bd371952be555b57ac4abc71d582d Mon Sep 17 00:00:00 2001
From: Alfred Bez <alfred.bez@googlemail.com>
Date: Fri, 9 Dec 2022 16:59:54 +0100
Subject: [PATCH] Check if GNU patch is used

fixes #326
---
 src/Plugin/Patches.php | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/Plugin/Patches.php b/src/Plugin/Patches.php
index 5e5cf220..d71018b4 100644
--- a/src/Plugin/Patches.php
+++ b/src/Plugin/Patches.php
@@ -443,6 +443,14 @@ protected function getAndApplyPatch(RemoteFilesystem $downloader, $install_path,
             // differences between how patch works on windows and unix.
             $patch_options = '--no-backup-if-mismatch';
             if (PHP_OS_FAMILY == 'BSD') {
+                $patchVersion = '';
+                $this->executor->execute('patch --version', $patchVersion);
+                if (strpos($patchBinaryVersion, 'GNU patch') === false) {
+                    throw new \Exception(
+                        "Please make sure to have GNU patch installed, see "
+                        . "https://github.com/cweagans/composer-patches/wiki/Install-%22patch%22-binary"
+                    );
+                }
                 $patch_options = '--posix --batch';
             }
             foreach ($patch_levels as $patch_level) {