Method RunExpose

pkg/cmd/expose/expose.go:296–428

RunExpose retrieves the Kubernetes Object from the API server and expose it to a Kubernetes Service

(cmd *cobra.Command, args []string)

// RunExpose retrieves the Kubernetes Object from the API server and expose it to a
// Kubernetes Service
func (o *ExposeServiceOptions) RunExpose(cmd *cobra.Command, args []string) error {
	r := o.Builder.
		WithScheme(scheme.Scheme, scheme.Scheme.PrioritizedVersionsAllGroups()...).
		ContinueOnError().
		NamespaceParam(o.Namespace).DefaultNamespace().
		FilenameParam(o.EnforceNamespace, &o.FilenameOptions).
		ResourceTypeOrNameArgs(false, args...).
		Flatten().
		Do()
	err := r.Err()
	if err != nil {
		return err
	}

	err = r.Visit(func(info *resource.Info, err error) error {
		if err != nil {
			return err
		}

		mapping := info.ResourceMapping()
		if err := o.CanBeExposed(mapping.GroupVersionKind.GroupKind()); err != nil {
			return err
		}

		name := info.Name
		if len(name) > validation.DNS1035LabelMaxLength {
			name = name[:validation.DNS1035LabelMaxLength]
		}
		o.DefaultName = name

		// For objects that need a pod selector, derive it from the exposed object in case a user
		// didn't explicitly specify one via --selector
		if len(o.Selector) == 0 {
			s, err := o.MapBasedSelectorForObject(info.Object)
			if err != nil {
				return fmt.Errorf("couldn't retrieve selectors via --selector flag or introspection: %v", err)
			}
			o.Selector = s
		}

		isHeadlessService := o.ClusterIP == "None"

		// For objects that need a port, derive it from the exposed object in case a user
		// didn't explicitly specify one via --port
		if len(o.Port) == 0 {
			ports, err := o.PortsForObject(info.Object)
			if err != nil {
				return fmt.Errorf("couldn't find port via --port flag or introspection: %v", err)
			}
			switch len(ports) {
			case 0:
				if !isHeadlessService {
					return fmt.Errorf("couldn't find port via --port flag or introspection")
				}
			case 1:
				o.Port = ports[0]
			default:
				o.Ports = strings.Join(ports, ",")