return nil, fmt.Errorf("failed to execute command on Envoy: %v", err)
	}
	return setupClustersEnvoyConfigWriter(debug, out)
}

func setupFileClustersWriter(filename string, out io.Writer) (*clusters.ConfigWriter, error) {
	data, err := readFile(filename)
	if err != nil {
		return nil, err
	}
	return setupClustersEnvoyConfigWriter(data, out)
}

// TODO(fisherxu): migrate this to config dump when implemented in Envoy