Add namespace configuration option for kubectl/kustomize

[AndiDog]

Expected behavior

Target deployment namespace should be specifiable in skaffold.yaml, e.g. deploy:kubectl:namespace.

Actual behavior

The helm deployer supports deploying to a certain namespace as specified in skaffold.yaml, but for kubectl/kustomize deployers, that can only be achieved with the environment variable SKAFFOLD_NAMESPACE or -n/--namespace CLI option.

Information

• Skaffold version: v0.41.0

This is helpful if the namespace depends on the environment, e.g. dev/prod using a different namespace, but the values are still fixed and should therefore not require any special env var or CLI parameter to run a deployment correctly.

Probably somewhat relevant for #915 (similar use case).

[tejal29]

@AndiDog there is a --namespace flag for --deploy

[AndiDog]

Sorry, a CLI argument is not a solution as I described in the summary. skaffold.yaml is supposed to be the central source of truth, while CLI args and environment variables serve as overrides. Therefore, one needs to be able to specify the default target namespace in that config file, while -n/--namespace/SKAFFOLD_NAMESPACE allow overriding that setting.

Can you please reopen, considering this use case? I'm even eager to implement that – shouldn't be too hard.

[balopat]

I'm open for adding this, and thank you @AndiDog for volunteering to implement it :)

[AndiDog]

As an update: I've looked into this, but still have to find some more time to see how it can be done – right now, most code uses the run context namespace, and that would need to be overridden/changed by configuration. Any hints welcome.

[tstromberg]

@AndiDog - Is this still being worked on? Let us know if there is anything in particular we can help with.

[AndiDog]

I made a start on it, but didn't get it finished yet. Too busy, and was also waiting on another PR. Hopefully I can progress here soon.