public function subsplitUpdate()
    {
        $repo = $this->getRepository();
        $this->log('git-subsplit update...');
        $cmd = $this->client->getCommand('subsplit');
        $cmd->addArgument('update');
        try {
            $cmd->execute();
        } catch (Exception $e) {
            throw new BuildException('git subsplit update failed'. $e);
        }
        chdir($repo . '/.subsplit');
        passthru('php ../composer.phar update --dev');
        chdir($repo);
    }