protected function initUpgradeFile()
    {
        touch($this->upgradeFile);
        $this->_info = new \Zend_Config_Ini($this->upgradeFile, null, array('allowModifications' => true));
        
        foreach(array_keys($this->_upgradeStack) as $context) {
            $maxLevel = $this->getMaxLevel($context);
            $this->setLevel($context, $maxLevel, true);
        }
    }