nodename-lowercase-validation.go

// kubernetes tree: c005b9d0ab6cd963abf66a9a12fb8ad5e48121ad

enforcedNodeAddresses = append(enforcedNodeAddresses, v1.NodeAddress{Type: v1.NodeHostName, Address: kl.GetHostname()})
				node.Status.Addresses = enforcedNodeAddresses
				return nil
			}




		// Only add a NodeHostName address if the cloudprovider did not specify one
		// (we assume the cloudprovider knows best)
		var addressNodeHostName *v1.NodeAddress
		for i := range nodeAddresses {
			if nodeAddresses[i].Type == v1.NodeHostName {
				addressNodeHostName = &nodeAddresses[i]
				break
			}
		}




func (kl *Kubelet) tryRegisterWithAPIServer(node *v1.Node) bool {
	_, err := kl.kubeClient.CoreV1().Nodes().Create(node)


pkg/client/clientset_generated/internalclientset/typed/core/internalversion/node.go

// Create takes the representation of a node and creates it.  Returns the server's representation of the node, and an error, if there is any.
func (c *nodes) Create(node *core.Node) (result *core.Node, err error) {
	result = &core.Node{}
	err = c.client.Post().
		Resource("nodes").
		Body(node).
		Do().
		Into(result)
	return
}




pkg/apis/core/validation/validation.go


// NOTE: nameFn -> ValidateNodeName

// ValidateNodeName can be used to check whether the given node name is valid.
// Prefix indicates this name will be used as part of generation, in which case
// trailing dashes are allowed.
var ValidateNodeName = NameIsDNSSubdomain

// NOTE: see NameIsDNSSubdomain below

// ValidateNode tests if required fields in the node are set.
func ValidateNode(node *core.Node) field.ErrorList {
	fldPath := field.NewPath("metadata")
	allErrs := ValidateObjectMeta(&node.ObjectMeta, false, ValidateNodeName, fldPath)
	allErrs = append(allErrs, ValidateNodeSpecificAnnotations(node.ObjectMeta.Annotations, fldPath.Child("annotations"))...)
	if len(node.Spec.Taints) > 0 {
		allErrs = append(allErrs, validateNodeTaints(node.Spec.Taints, fldPath.Child("taints"))...)
	}



// ValidateObjectMeta validates an object's metadata on creation. It expects that name generation has already
// been performed.
// It doesn't return an error for rootscoped resources with namespace, because namespace should already be cleared before.
// TODO: Remove calls to this method scattered in validations of specific resources, e.g., ValidatePodUpdate.
func ValidateObjectMeta(meta *metav1.ObjectMeta, requiresNamespace bool, nameFn ValidateNameFunc, fldPath *field.Path) field.ErrorList {
	allErrs := apimachineryvalidation.ValidateObjectMeta(meta, requiresNamespace, apimachineryvalidation.ValidateNameFunc(nameFn), fldPath)
	// run additional checks for the finalizer name
	for i := range meta.Finalizers {
		allErrs = append(allErrs, validateKubeFinalizerName(string(meta.Finalizers[i]), fldPath.Child("finalizers").Index(i))...)
	}
	return allErrs
}



// ValidateObjectMeta validates an object's metadata on creation. It expects that name generation has already
// been performed.
// It doesn't return an error for rootscoped resources with namespace, because namespace should already be cleared before.
func ValidateObjectMeta(objMeta *metav1.ObjectMeta, requiresNamespace bool, nameFn ValidateNameFunc, fldPath *field.Path) field.ErrorList {
	metadata, err := meta.Accessor(objMeta)
	if err != nil {
		allErrs := field.ErrorList{}
		allErrs = append(allErrs, field.Invalid(fldPath, objMeta, err.Error()))
		return allErrs
	}
	return ValidateObjectMetaAccessor(metadata, requiresNamespace, nameFn, fldPath)
}



// ValidateObjectMeta validates an object's metadata on creation. It expects that name generation has already
// been performed.
// It doesn't return an error for rootscoped resources with namespace, because namespace should already be cleared before.
func ValidateObjectMetaAccessor(meta metav1.Object, requiresNamespace bool, nameFn ValidateNameFunc, fldPath *field.Path) field.ErrorList {
	allErrs := field.ErrorList{}

	if len(meta.GetGenerateName()) != 0 {
		for _, msg := range nameFn(meta.GetGenerateName(), true) {
			allErrs = append(allErrs, field.Invalid(fldPath.Child("generateName"), meta.GetGenerateName(), msg))
		}
	}
	// If the generated name validates, but the calculated value does not, it's a problem with generation, and we
	// report it here. This may confuse users, but indicates a programming bug and still must be validated.
	// If there are multiple fields out of which one is required then add an or as a separator
	if len(meta.GetName()) == 0 {
		allErrs = append(allErrs, field.Required(fldPath.Child("name"), "name or generateName is required"))
	} else {
		for _, msg := range nameFn(meta.GetName(), false) {
			allErrs = append(allErrs, field.Invalid(fldPath.Child("name"), meta.GetName(), msg))
		}
	}
	if requiresNamespace {
		if len(meta.GetNamespace()) == 0 {
			allErrs = append(allErrs, field.Required(fldPath.Child("namespace"), ""))
		} else {
			for _, msg := range ValidateNamespaceName(meta.GetNamespace(), false) {
				allErrs = append(allErrs, field.Invalid(fldPath.Child("namespace"), meta.GetNamespace(), msg))
			}
		}
	} else {
		if len(meta.GetNamespace()) != 0 {
			allErrs = append(allErrs, field.Forbidden(fldPath.Child("namespace"), "not allowed on this type"))
		}
	}
	if len(meta.GetClusterName()) != 0 {
		for _, msg := range ValidateClusterName(meta.GetClusterName(), false) {
			allErrs = append(allErrs, field.Invalid(fldPath.Child("clusterName"), meta.GetClusterName(), msg))
		}
	}
	allErrs = append(allErrs, ValidateNonnegativeField(meta.GetGeneration(), fldPath.Child("generation"))...)
	allErrs = append(allErrs, v1validation.ValidateLabels(meta.GetLabels(), fldPath.Child("labels"))...)
	allErrs = append(allErrs, ValidateAnnotations(meta.GetAnnotations(), fldPath.Child("annotations"))...)
	allErrs = append(allErrs, ValidateOwnerReferences(meta.GetOwnerReferences(), fldPath.Child("ownerReferences"))...)
	allErrs = append(allErrs, ValidateInitializers(meta.GetInitializers(), fldPath.Child("initializers"))...)
	allErrs = append(allErrs, ValidateFinalizers(meta.GetFinalizers(), fldPath.Child("finalizers"))...)
	return allErrs
}


// pkg/apis/core/validation/validation.go

// TODO update all references to these functions to point to the apimachineryvalidation ones
// NameIsDNSSubdomain is a ValidateNameFunc for names that must be a DNS subdomain.
func NameIsDNSSubdomain(name string, prefix bool) []string {
	return apimachineryvalidation.NameIsDNSSubdomain(name, prefix)
}

// NameIsDNS1035Label is a ValidateNameFunc for names that must be a DNS 952 label.
func NameIsDNS1035Label(name string, prefix bool) []string {
	return apimachineryvalidation.NameIsDNS1035Label(name, prefix)
}

// NameIsDNS1035Label is a ValidateNameFunc for names that must be a DNS 952 label.
func NameIsDNS1035Label(name string, prefix bool) []string {
	if prefix {
		name = maskTrailingDash(name)
	}
	return validation.IsDNS1035Label(name)
}

// staging/src/k8s.io/apimachinery/pkg/api/validation/generic.go

// NameIsDNSSubdomain is a ValidateNameFunc for names that must be a DNS subdomain.
func NameIsDNSSubdomain(name string, prefix bool) []string {
	if prefix {
		name = maskTrailingDash(name)
	}
	return validation.IsDNS1123Subdomain(name)
}


// NameIsDNS1035Label is a ValidateNameFunc for names that must be a DNS 952 label.
func NameIsDNS1035Label(name string, prefix bool) []string {
	if prefix {
		name = maskTrailingDash(name)
	}
	return validation.IsDNS1035Label(name)
}



const dns1035LabelFmt string = "[a-z]([-a-z0-9]*[a-z0-9])?"
const dns1035LabelErrMsg string = "a DNS-1035 label must consist of lower case alphanumeric characters or '-', start with an alphabetic character, and end with an alphanumeric character"
const DNS1035LabelMaxLength int = 63

var dns1035LabelRegexp = regexp.MustCompile("^" + dns1035LabelFmt + "$")

// IsDNS1035Label tests for a string that conforms to the definition of a label in
// DNS (RFC 1035).
func IsDNS1035Label(value string) []string {
	var errs []string
	if len(value) > DNS1035LabelMaxLength {
		errs = append(errs, MaxLenError(DNS1035LabelMaxLength))
	}
	if !dns1035LabelRegexp.MatchString(value) {
		errs = append(errs, RegexError(dns1035LabelErrMsg, dns1035LabelFmt, "my-name", "abc-123"))
	}
	return errs
}