Fix #1778: Log only errors and delete log file on installation

install.php

@@ -62,6 +62,12 @@ public function preflight($type, $parent) {
 		// Prevent installation if requirements are not met.
 		if (!$this->checkRequirements($manifest->version)) return false;
 
+		// Remove old log file before installation.
+		$logFile = JFactory::getConfig()->get('log_path').'/kunena.php';
+		if (file_exists($logFile)) {
+			@unlink($logFile);
+		}
+
 		return true;
 	}
 

libraries/kunena/forum/forum.php

@@ -140,8 +140,9 @@ public static function setup() {
 		jimport('joomla.error.log');
 		$options = array('logger'=>'w3c', 'text_file'=>'kunena.php');
 		$categories = array('kunena');
-		JLog::addLogger($options, JLog::ALL, $categories);
-
+		$levels = JDEBUG || $config->debug ? JLog::ALL :
+			JLog::EMERGENCY & JLog::ALERT & JLog::CRITICAL & JLog::ERROR;
+		JLog::addLogger($options, $levels, $categories);
 	}
 
 	/**