What happened?

When trying to create a configMapGenerator via kustomize edit add configmap, it is not possible to specify a namespace for that resource. Running the following command:

kustomize edit add configmap test-cm --namespace test-ns --from-literal=testkey=testvalue

will output

Error: unknown flag: --namespace

However, editing the kustomization file to add a namespace, like so:

apiVersion: kustomize.config.k8s.io/v1beta1
kind: Kustomization
configMapGenerator:
- literals:
  - testkey=testvalue
  name: test-cm
  namespace: test-ns

then running kustomize build results in a ConfigMap configuration containing a namespace:

kustomize build .

apiVersion: v1
data:
  testkey: testvalue
kind: ConfigMap
metadata:
  name: test-cm-bgk86k8k5t
  namespace: test-ns

What did you expect to happen?

A namespace gets added to the configMapGenerator.

How can we reproduce it (as minimally and precisely as possible)?

Just running

kustomize edit add configmap test-cm --namespace test-ns --from-literal=testkey=testvalue

will demonstrate the issue.

Expected output

apiVersion: kustomize.config.k8s.io/v1beta1
kind: Kustomization
configMapGenerator:
- literals:
  - testkey=test-value
  name: test-cm
  namespace: test-ns

Actual output

Error: unknown flag: --namespace

Kustomize version

v5.1.1

Operating system

MacOS