private function getCommandProcessBuilder()
    {
        $pb = new ProcessBuilder();

        // PHP wraps the process in "sh -c" by default, but we need to control
        // the process directly.
        if (!defined('PHP_WINDOWS_VERSION_MAJOR')) {
            $pb->add('exec');
        }

        $pb
            ->add('php')
            ->add($this->getContainer()->getParameter('kernel.root_dir').'/console')
            ->add('--env='.$this->env)
        ;

        return $pb;
    }