better error reporting during installation

lib/config.php

@@ -177,8 +177,13 @@ class OC_Config{
 		$content .= ");\n?>\n";
 
 		// Write the file
-		file_put_contents( "$SERVERROOT/config/config.php", $content );
-
+		$result=@file_put_contents( "$SERVERROOT/config/config.php", $content );
+		if(!$result) {
+			$tmpl = new OC_Template( '', 'error', 'guest' );
+			$tmpl->assign('errors',array(1=>array('error'=>"Can't write into config directory 'config'",'hint'=>"You can usually fix this by setting the owner of 'config' to the user that the web server uses (".exec('whoami').")")));
+			$tmpl->printPage();
+			exit;
+		}
 		return true;
 	}
 }

lib/crypt.php

@@ -61,7 +61,7 @@ class OC_Crypt {
 
 			// Write the file
 		        $username=OC_USER::getUser();
-			file_put_contents(OC_Config::getValue( "datadirectory").'/'.$username.'/encryption.key', $enckey );
+			@file_put_contents(OC_Config::getValue( "datadirectory").'/'.$username.'/encryption.key', $enckey );
 		}
 	}