kubernetes/kops · error

field Name not found in %T

Error message

field Name not found in %T

What it means

Inside setType, string values targeting an env-var-style struct are split into Name/Value fields via reflection. If the destination struct type has no exported field named "Name", FieldByName fails and this error is returned. This guards against applying an env-var-shaped string to an incompatible struct type.

Source

Thrown at util/pkg/reflectutils/access.go:265

			newV = reflect.ValueOf(v32)
		case "uint64":
			v64 := uint64(v)
			newV = reflect.ValueOf(v64)
		default:
			panic("missing case in uint switch")
		}

	case "intstr.IntOrString":
		newV = reflect.ValueOf(intstr.Parse(newValue))

	case "kops.EnvVar":
		newV = reflect.New(v.Type()).Elem()

		envVarType := newV.Type()

		fdName, found := envVarType.FieldByName("Name")
		if !found {
			return fmt.Errorf("field Name not found in %T", newV.Interface())
		}
		fdValue, found := envVarType.FieldByName("Value")
		if !found {
			return fmt.Errorf("field Value not found in %T", newV.Interface())
		}

		name, value, hasValue := strings.Cut(newValue, "=")
		newV.FieldByIndex(fdName.Index).SetString(name)
		if hasValue {
			newV.FieldByIndex(fdValue.Index).SetString(value)
		}

	case "v1.Duration":
		duration, err := time.ParseDuration(newValue)
		if err != nil {
			return fmt.Errorf("cannot interpret %q value as v1.Duration", newValue)
		}
		newV = reflect.ValueOf(metav1.Duration{Duration: duration})

View on GitHub (pinned to 4c8573c808)

Solutions

1. Verify the struct's reflectutils type tag: fields tagged as env-var must have Name and Value string fields
2. Update the struct definition to include Name/Value fields, or change the type tag to a matching kind
3. Use a field path that targets the correct field instead of the whole struct

Example fix

// before
type EnvEntry struct {
	Key   string
	Value string
}
// after
type EnvEntry struct {
	Name  string
	Value string
}

t := reflect.TypeOf(targetStruct)
if _, ok := t.FieldByName("Name"); !ok {
	return fmt.Errorf("type %s cannot be used as env-var entry", t)
}

func isEnvVarType(v interface{}) bool {
	t := reflect.TypeOf(v)
	if t.Kind() == reflect.Ptr { t = t.Elem() }
	_, hasName := t.FieldByName("Name")
	_, hasValue := t.FieldByName("Value")
	return hasName && hasValue
}

if err := Unset/set...; err != nil && strings.Contains(err.Error(), "field Name not found") {
	// struct schema mismatch; fix type tag or field
}

When it happens

Trigger: Calling kops set with a path whose value is treated as an env-var entry (TypeTag "env-var") while the resolved struct type lacks a Name field — essentially only possible if the type tag in the struct tag is wrong or the struct definition changed.

Common situations: Custom downstream types reusing the reflectutils tags but without Name/Value fields, or an API version change that renamed fields while stale struct tags still declare the env-var type.

Related errors

• field Value not found in %T
• conversion error for field %s: %s
• unable to convert from Quantity %v to float
• BuildFlagsList to reflect value: %s
• only accepts structs; got %T

AI-assisted analysis of kubernetes/kops@4c8573c808 (2026-09-05). Data as JSON: /api/errors/0c16861fd63234f5. Report an issue: GitHub.