func ParseEtcdVersion(s string) (*EtcdVersion, error) {
	v, err := semver.Make(s)
	if err != nil {
		return nil, err
	}
	return &EtcdVersion{v}, nil
}

// MustParseEtcdVersion parses a SemVer string to an EtcdVersion and panics if the parse fails.
func MustParseEtcdVersion(s string) *EtcdVersion {
	return &EtcdVersion{semver.MustParse(s)}
}

// String returns the version in SemVer string format.
func (v *EtcdVersion) String() string {

// runMigrate starts the migration.
func runMigrate() {
	if err := opts.validateAndDefault(); err != nil {
		klog.Fatalf("%v", err)
	}
	copyBinaries()

	target := &EtcdVersionPair{
		version:        MustParseEtcdVersion(opts.targetVersion),
		storageVersion: MustParseEtcdStorageVersion(opts.targetStorage),
	}

	migrate(
		opts.name, opts.port, opts.peerListenUrls, opts.peerAdvertiseUrls, opts.clientListenUrls,