namespace defaults to in-cluster namespace when run with explicit KUBECONFIG

[hojerst]

When a KUBECONFIG is set explicitly to a external cluster, the client still defaults to the namespace mounted in /run/secrets/kubernetes.io/serviceaccount. This means the same kubeconfig setting/file will behave differently depending if it is run inside or outside of a cluster.

IMHO this should be changed to default to the default namespace as if run outside of the cluster. Defaulting to the serviceaccount's namespace doesn't really make sense here as the referenced cluster might not even have this namespace and it leads to inconsistent and unexpected behaviour.

[porridge]

It's funny how the logic was here for years, and I got down to tracking down this behaviour to this logic where the library explicitly avoids using the implicit default namespace today and noticed your issue just as I was about to file my own, just hours after yours :-)

To provide an example of where this happens is when one runs KUBECONFIG=/some/other/clusters/config operator-sdk scorecard in a pod in a namespace other than default, and the provided kubeconfig does not explicitly provide a namespace (which is typical I think).

[hojerst]

(sorry for the off-topic, just scroll on - but this needs to be said): whats even more funny is the fact that my whole endeavor finding this issue was intially caused by wrong kubeconfigs in kapp inside kuttl runs - an issue that you seem to have reported and fixed, but I was running an older version of kuttl with the bug present. If I would have updated, I would never run into this. Small small world...

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