[ClassLoader] Throw an exception if the cache is not writeable

lyrixx · lyrixx · commit c5b65de9f37e · 2017-01-09T14:41:07.000+01:00
diff --git a/src/Symfony/Component/ClassLoader/ClassCollectionLoader.php b/src/Symfony/Component/ClassLoader/ClassCollectionLoader.php
@@ -275,7 +275,15 @@ private static function compressCode($code)
      */
     private static function writeCacheFile($file, $content)
     {
-        $tmpFile = tempnam(dirname($file), basename($file));
+        set_error_handler(function () use ($file) {
+            throw new \RuntimeException(sprintf('Failed to create temporary file in "%s".', dirname($file)));
+        });
+        try {
+            $tmpFile = tempnam(dirname($file), basename($file));
+        } finally {
+            restore_error_handler();
+        }
+
         if (false !== @file_put_contents($tmpFile, $content) && @rename($tmpFile, $file)) {
             @chmod($file, 0666 & ~umask());
 
