From 13421f7d66ae8e824e9b821f2aee75772284cbbb Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ond=C5=99ej=20Mirtes?= <ondrej@mirtes.cz>
Date: Fri, 26 Aug 2022 15:01:28 +0200
Subject: [PATCH] Config - always respect COMPOSER_DISCARD_CHANGES

---
 src/Composer/Config.php | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/Composer/Config.php b/src/Composer/Config.php
index 141efa6ff01f..8d132bb7c068 100644
--- a/src/Composer/Config.php
+++ b/src/Composer/Config.php
@@ -376,7 +376,8 @@ public function get(string $key, int $flags = 0)
                 return $value;
 
             case 'discard-changes':
-                if ($env = $this->getComposerEnv('COMPOSER_DISCARD_CHANGES')) {
+                $env = $this->getComposerEnv('COMPOSER_DISCARD_CHANGES');
+                if ($env !== false) {
                     if (!in_array($env, ['stash', 'true', 'false', '1', '0'], true)) {
                         throw new \RuntimeException(
                             "Invalid value for COMPOSER_DISCARD_CHANGES: {$env}. Expected 1, 0, true, false or stash"
@@ -519,7 +520,7 @@ private function realpath(string $path): string
      * This should be used to read COMPOSER_ environment variables
      * that overload config values.
      *
-     * @return string|bool
+     * @return string|false
      */
     private function getComposerEnv(string $var)
     {