updated vendor

vendor/k8s.io/apimachinery/pkg/api/validate/union.go

@@ -19,6 +19,7 @@ package validate
 import (
 	"context"
 	"fmt"
+	"reflect"
 	"strings"
 
 	"k8s.io/apimachinery/pkg/api/operation"
@@ -60,6 +61,10 @@ type UnionValidationOptions struct {
 //		)...)
 //		return errs
 //	}
+//
+// Note that T is "any", rather than "comparable", because union-members can be
+// slices, meaning T might be a struct with a slice, meaning it is not
+// comparable.
 func Union[T any](_ context.Context, op operation.Operation, fldPath *field.Path, obj, oldObj T, union *UnionMembership, isSetFns ...ExtractorFn[T, bool]) field.ErrorList {
 	options := UnionValidationOptions{
 		ErrorForEmpty: func(fldPath *field.Path, allFields []string) *field.Error {
@@ -72,7 +77,7 @@ func Union[T any](_ context.Context, op operation.Operation, fldPath *field.Path
 		},
 	}
 
-	return unionValidate(op, fldPath, obj, oldObj, union, options, isSetFns...)
+	return unionValidate(op, fldPath, obj, oldObj, union, options, isSetFns...).WithOrigin("union")
 }
 
 // DiscriminatedUnion verifies specified union member matches the discriminator.
@@ -98,6 +103,10 @@ func Union[T any](_ context.Context, op operation.Operation, fldPath *field.Path
 //
 // It is not an error for the discriminatorValue to be unknown.  That must be
 // validated on its own.
+//
+// Note that T is "any", rather than "comparable", because union-members can be
+// slices, meaning T might be a struct with a slice, meaning it is not
+// comparable.
 func DiscriminatedUnion[T any, D ~string](_ context.Context, op operation.Operation, fldPath *field.Path, obj, oldObj T, union *UnionMembership, discriminatorExtractor ExtractorFn[T, D], isSetFns ...ExtractorFn[T, bool]) (errs field.ErrorList) {
 	if len(union.members) != len(isSetFns) {
 		return field.ErrorList{
@@ -106,6 +115,7 @@ func DiscriminatedUnion[T any, D ~string](_ context.Context, op operation.Operat
 					len(isSetFns), len(union.members))),
 		}
 	}
+	hasOldValue := !reflect.ValueOf(oldObj).IsZero() // because T is any, rather than comparable
 	var changed bool
 	discriminatorValue := discriminatorExtractor(obj)
 	if op.Type == operation.Update {
@@ -131,10 +141,10 @@ func DiscriminatedUnion[T any, D ~string](_ context.Context, op operation.Operat
 	}
 	// If the union discriminator and membership is unchanged, we don't need to
 	// re-validate.
-	if op.Type == operation.Update && !changed {
+	if op.Type == operation.Update && hasOldValue && !changed {
 		return nil
 	}
-	return errs
+	return errs.WithOrigin("union")
 }
 
 // UnionMember represents a member of a union.
@@ -195,6 +205,7 @@ func unionValidate[T any](op operation.Operation, fldPath *field.Path,
 		}
 	}
 
+	hasOldValue := !reflect.ValueOf(oldObj).IsZero() // because T is any, rather than comparable
 	var specifiedFields []string
 	var changed bool
 	for i, fieldIsSet := range isSetFns {
@@ -209,7 +220,7 @@ func unionValidate[T any](op operation.Operation, fldPath *field.Path,
 	}
 
 	// If the union membership is unchanged, we don't need to re-validate.
-	if op.Type == operation.Update && !changed {
+	if op.Type == operation.Update && hasOldValue && !changed {
 		return nil
 	}