From 3e0219c4384465bc0f66369817426e3baa103583 Mon Sep 17 00:00:00 2001
From: Zsolt Szeberenyi <zsolt@vendhq.com>
Date: Sat, 13 Jun 2015 10:15:56 +0200
Subject: [PATCH] Change the content hash to be only based on values that
 affect dependency resolution

---
 src/Composer/Factory.php | 23 +++++++++++++++++++++--
 1 file changed, 21 insertions(+), 2 deletions(-)

diff --git a/src/Composer/Factory.php b/src/Composer/Factory.php
index 755b8884f..d14cee7bd 100644
--- a/src/Composer/Factory.php
+++ b/src/Composer/Factory.php
@@ -496,7 +496,26 @@ class Factory
     private function getContentHash($composerFilePath)
     {
         $content = json_decode(file_get_contents($composerFilePath), true);
-        ksort($content);
-        return md5(json_encode($content));
+
+        $relevantKeys = array(
+            'require',
+            'require-dev',
+            'conflict',
+            'replace',
+            'provide',
+            'suggest',
+            'minimum-stability',
+            'prefer-stable',
+            'repositories',
+        );
+
+        $relevantContent = array();
+
+        foreach (array_intersect($relevantKeys, array_keys($content)) as $key) {
+            $relevantContent[$key] = $content[$key];
+        }
+
+        ksort($relevantContent);
+        return md5(json_encode($relevantContent));
     }
 }