protected function rollback($slug)
    {
        if (! $this->packages->exists($slug)) {
            return $this->error('Package does not exist.');
        }

        $this->requireMigrations($slug);

        //
        $this->migrator->setConnection($this->input->getOption('database'));

        $pretend = $this->input->getOption('pretend');

        $this->migrator->rollback($pretend, $slug);

        //
        foreach ($this->migrator->getNotes() as $note) {
            if (! $this->option('quiet')) {
                $this->line($note);
            }
        }
    }