fix failing master branch - Test_Config::testWriteData

lib/config.php

@@ -144,7 +144,11 @@ class Config {
 				continue;
 			}
 			unset($CONFIG);
-			include $file;
+			if((@include $file) === false)
+			{
+				throw new HintException("Can't read from config file '" . $file . "'. ".
+					'This is usually caused by the wrong file permission.');
+			}
 			if (isset($CONFIG) && is_array($CONFIG)) {
 				$this->cache = array_merge($this->cache, $CONFIG);
 			}

tests/lib/config.php

@@ -80,6 +80,17 @@ class Test_Config extends PHPUnit_Framework_TestCase {
 	 */
 	public function testWriteData() {
 		$config = new OC\Config('/non-writable');
+		// TODO never get's called, because the previous call throws the exception
+		// maybe include some more logic to create a readable dir and then try to
+		// write to this dir
+		//
+		// console commands:
+		// $ sudo touch /non-writableconfig.php
+		// $ sudo chmod go-rwx /non-writableconfig.php
+		// ---- call the tests now -> above statemant throws the exception
+		//
+		// $ sudo chmod go+r /non-writableconfig.php
+		// ---- call the tests now -> bellow statemant throws the exception
 		$config->setValue('foo', 'bar');
 	}
 }