From eecde1ab980a8435def8fc92f9f8b40b9f013dc0 Mon Sep 17 00:00:00 2001
From: Michael Stucki <michael@stucki.io>
Date: Fri, 13 Jul 2018 13:01:45 +0200
Subject: [PATCH] Fixes #174: Compatibility with older Git versions

---
 src/Plugin/Patches.php | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/Plugin/Patches.php b/src/Plugin/Patches.php
index de98a99c..249ec7e0 100644
--- a/src/Plugin/Patches.php
+++ b/src/Plugin/Patches.php
@@ -457,6 +457,12 @@ protected function isPatchingEnabled()
      */
     protected function applyPatchWithGit($install_path, $patch_levels, $filename)
     {
+        // Do not use git apply unless the install path is itself a git repo
+        // @see https://stackoverflow.com/a/27283285
+        if (!is_dir($install_path . '/.git')) {
+            return false;
+        }
+
         foreach ($patch_levels as $patch_level) {
             if ($this->io->isVerbose()) {
                 $comment = 'Testing ability to patch with git apply.';