// https://github.com/kubernetes/kubernetes/blob/954996e231074dc7429f7be1256a579bedd8344c/pkg/kubelet/dockershim/network/cni/cni.go#L144-L184
func getDefaultCNINetwork(confDir string) (string, error) {
	files, err := libcni.ConfFiles(confDir, []string{".conf", ".conflist"})
	switch {
	case err != nil:
		return "", err
	case len(files) == 0:
		return "", fmt.Errorf("no networks found in %s", confDir)
	}

	sort.Strings(files)