From b181822e90e68f7525341654f58971d1bfcc7834 Mon Sep 17 00:00:00 2001
From: Jordi Boggiano <j.boggiano@seld.be>
Date: Thu, 28 May 2015 15:26:56 +0100
Subject: [PATCH] Fix case where touch() fails due to incorrect ownership,
 fixes #4070

---
 src/Composer/Cache.php | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/Composer/Cache.php b/src/Composer/Cache.php
index dfecef010..e49edf649 100644
--- a/src/Composer/Cache.php
+++ b/src/Composer/Cache.php
@@ -136,7 +136,13 @@ class Cache
     {
         $file = preg_replace('{[^'.$this->whitelist.']}i', '-', $file);
         if ($this->enabled && file_exists($this->root . $file)) {
-            touch($this->root . $file, filemtime($this->root . $file), time());
+            try {
+                touch($this->root . $file, filemtime($this->root . $file), time());
+            } catch (\ErrorException $e) {
+                // fallback in case the above failed due to incorrect ownership
+                // see https://github.com/composer/composer/issues/4070
+                touch($this->root . $file);
+            }
 
             if ($this->io->isDebug()) {
                 $this->io->writeError('Reading '.$this->root . $file.' from cache');