kubernetes/cmd/kubeadm/app/discovery/https/https.go

// RetrieveValidatedConfigInfo connects to the API Server and makes sure it can talk
// securely to the API Server using the provided CA cert and
// optionally refreshes the cluster-info information from the cluster-info ConfigMap
func RetrieveValidatedConfigInfo(httpsURL string, discoveryTimeout time.Duration) (*clientcmdapi.Config, error) {}