f += YAMLSeparator
		}
		_, err := sb.WriteString(f)
		if err != nil {
			return "", err
		}
	}

	return sb.String(), nil
}

// GenerateHubTagOverlay creates an IstioOperatorSpec overlay YAML for hub and tag.
func GenerateHubTagOverlay(hub, tag string) (string, error) {
	hubTagYAMLTemplate := `
spec:
  hub: {{.Hub}}
  tag: {{.Tag}}
`
	ts := struct {
		Hub string
		Tag string
	}{

func overlayHubAndTag(yml string) (string, error) {
	hub := pkgversion.DockerInfo.Hub
	tag := pkgversion.DockerInfo.Tag
	out := yml
	if hub != "unknown" && tag != "unknown" {
		buildHubTagOverlayYAML, err := helm.GenerateHubTagOverlay(hub, tag)
		if err != nil {
			return "", err
		}
		out, err = util.OverlayYAML(yml, buildHubTagOverlayYAML)
		if err != nil {
			return "", err
		}
	}
	return out, nil
}

	hub := version.DockerInfo.Hub
	tag := version.DockerInfo.Tag
	if hub != "" && hub != "unknown" && tag != "" && tag != "unknown" {
		buildHubTagOverlayYAML, err := helm.GenerateHubTagOverlay(hub, tag)
		if err != nil {
			metrics.CountCRMergeFail(metrics.OverlayError)
			return nil, err
		}
		profileYAML, err = util.OverlayYAML(profileYAML, buildHubTagOverlayYAML)
		if err != nil {