You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: versiongetter.go
    path of file: ./repos/kubernetes/cmd/kubeadm/app/phases/upgrade
    
    the code of the file until where you have to start completion: /*
Copyright 2017 The Kubernetes Authors.

Licensed under the Apache License, Version
    
func (g *KubeVersionGetter) ClusterVersion() (string, *versionutil.Version, error) {
	var (
		clusterVersionInfo *pkgversion.Info
		err                error
	)
	// If we are dry-running, do not attempt to fetch the /version resource and just return
	// the stored FakeServerVersion, which is done when constructing the dry-run client in
	// common.go#getClient()
	// The problem here is that during upgrade dry-run client reactors are backed by a dynamic client
	// via NewClientBackedDryRunGetterFromKubeconfig() and for GetActions there seems to be no analog to
	// Discovery().Serverversion() resource for a dynamic client(?).
	fakeclientDiscovery, ok := g.client.Discovery().(*fakediscovery.FakeDiscovery)
	if ok {
		clusterVersionInfo = fakeclientDiscovery.FakedServerVersion
	} else {
		clusterVersionInfo, err = g.client.Discovery().ServerVersion()
		if err != nil {
			return "", nil, errors.Wrap(err, "Couldn't fetch cluster version from the API Server")
		}
	}

	clusterVersion, err := versionutil.ParseSemantic(clusterVersionInfo.String())
	if err != nil {
		return "", nil, errors.Wrap(err, "Couldn't parse cluster version")
	}
	return clusterVersionInfo.String(), clusterVersion, nil
}