func (s *GenericAPIServer) newAPIGroupVersion(groupMeta apimachinery.GroupMeta, groupVersion unversioned.GroupVersion) (*apiserver.APIGroupVersion, error) {
	versionInterface, err := groupMeta.InterfacesFor(groupVersion)
	if err != nil {
		return nil, err
	}
	return &apiserver.APIGroupVersion{
		RequestInfoResolver: s.NewRequestInfoResolver(),

		Creater:   api.Scheme,
		Convertor: api.Scheme,
		Typer:     api.Scheme,

		GroupVersion: groupVersion,
		Linker:       groupMeta.SelfLinker,
		Mapper:       groupMeta.RESTMapper,
		Codec:        versionInterface.Codec,

		Admit:   s.AdmissionControl,
		Context: s.RequestContextMapper,

		MinRequestTimeout: s.MinRequestTimeout,
	}, nil
}

// mergeGroupMeta takes an lhs and an rhs GroupMeta, then builds a resulting GroupMeta that contains the
// merged information.  Order of merging matters: lhs wins.
func mergeGroupMeta(lhs, rhs apimachinery.GroupMeta) apimachinery.GroupMeta {
	merged := apimachinery.GroupMeta{}

	merged.GroupVersion = lhs.GroupVersion
	merged.SelfLinker = lhs.SelfLinker

	knownGVs := sets.String{}
	for _, lhsGV := range lhs.GroupVersions {
		knownGVs.Insert(lhsGV.String())
		merged.GroupVersions = append(merged.GroupVersions, lhsGV)
	}
	for _, rhsGV := range lhs.GroupVersions {
		if knownGVs.Has(rhsGV.String()) {
			continue
		}
		merged.GroupVersions = append(merged.GroupVersions, rhsGV)
	}

	merged.RESTMapper = meta.MultiRESTMapper(append([]meta.RESTMapper{}, lhs.RESTMapper, rhs.RESTMapper))

	merged.InterfacesFor = func(version unversioned.GroupVersion) (*meta.VersionInterfaces, error) {
		if ret, err := lhs.InterfacesFor(version); err == nil {
			return ret, nil
		}

		return rhs.InterfacesFor(version)
	}

	return merged
}