protected function getFromGit($command, $keySuffix, $length = 256)
    {
        if ($value = $this->cache->get($key = $this->cache->key($keySuffix))) {
            return $value;
        }

        $value = substr($this->shell($command), 0, $length);

        $this->cache->put($key, $value);

        return $value;
    }