Add a copied_sample_config switch

Hopefully this will stop people from copying the sample config. I'm so annoyed by all those wrong bug reports...

Add some explanation about this switch

Move check to init

config/config.sample.php

@@ -172,6 +172,10 @@ $CONFIG = array(
 /* File for the owncloud logger to log to, (default is ownloud.log in the data dir) */
 "logfile" => "",
 
+/* This entry is just here to show a warning in case somebody copied the sample configuration. DO NOT ADD THIS SWITCH TO YOUR CONFIGURATION!  */
+/* If you, brave person, have read until here be aware that you should not modify *ANY* settings in this file without reading the documentation */
+"copied_sample_config" => true,
+
 /* Loglevel to start logging at. 0=DEBUG, 1=INFO, 2=WARN, 3=ERROR (default is WARN) */
 "loglevel" => "",
 

lib/base.php

@@ -574,6 +574,18 @@ class OC {
 				OC_Util::addScript('backgroundjobs');
 			}
 		}
+
+		// Check whether the sample configuration has been copied
+		if(OC_Config::getValue('copied_sample_config', false)) {
+			$l = \OC_L10N::get('lib');
+			header('HTTP/1.1 503 Service Temporarily Unavailable');
+			header('Status: 503 Service Temporarily Unavailable');
+			OC_Template::printErrorPage(
+				$l->t('Sample configuration detected'),
+				$l->t('It has been detected that the sample configuration has been copied. This can break your installation and is unsupported. Please read the documentation before performing changes on config.php')
+			);
+			return;
+		}
 	}
 
 	private static function registerLocalAddressBook() {