ZF\Apigility\Admin\Controller\FsPermissionsController::rootIsWritable PHP Method

    protected function rootIsWritable()
    {
        if (null !== $this->rootIsWritable) {
            return $this->rootIsWritable;
        }
        $this->rootIsWritable = is_writable($this->root);
        return $this->rootIsWritable;
    }