Import of controller-runtime calls flag for "kubeconfig"

[chrischdi]

Hi there :-),

we are consuming cluster-api-provider-openstack which imports kubernetes-sigs/controller-runtime.

Because alias.go is importing sigs.k8s.io/controller-runtime/pkg/client/config it always defines the "kubeconfig" flag which then conflicts with other places where the same flag is getting defined. (e.g. inside kubernetes' e2e test framework https://github.com/kubernetes/kubernetes/blob/master/test/e2e/framework/test_context.go#L321)

Of course we are able to workaround it by not directly using the functions via alias.go but I think this is against the reasons why it does exist?

One alternative would be to define a RegisterFlag function instead of defining the flag via func init() {...}, however this leads to a breaking change.

^{Christian Schlotter , Daimler TSS GmbH, Imprint}

[chrischdi]

Addition: the same thing happens when importing sigs.k8s.io/cluster-api/api/v1alpha4 (sorry, I did write cluster-api-provider-openstack here first but mixed up the repos).

[fejta-bot]

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[chrischdi]

/remove-lifecycle stale

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[chrischdi]

/remove-lifecycle stale

[palnabarun]

/kind feature

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[chrischdi]

/remove-lifecycle stale

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[mk46]

/remove-lifecycle stale

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/lifecycle stale

[mk46]

/remove-lifecycle stale

[johannesfrey]

FYI: I created following PR: #1999

[johannesfrey]

Should we close this issue now that #1999 has been merged? Or should we keep this issue open until the init function is removed completely (if this is desired at all)?

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/lifecycle stale

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/lifecycle rotten

[sbueringer]

Should we close this issue now that #1999 has been merged? Or should we keep this issue open until the init function is removed completely (if this is desired at all)?

Sorry for the late reply. I'm not sure if we want to drop the init function.

Pro:

• it would be better if no flags are just implicitly registered because someone imports the config package

Con:

• nobody seems to complain about it so it seems to work for most people

On the other hand, I think almost all controller are just run inside of a Pod and barely anyone is using a --kubeconfig command line flag.

IIRC component-base/logs also dropped the implicit registering of flags. So I'm slightly in favor of getting rid of the implicit flag registration (after whatever deprecation period / release notes it is appropriate)

@alvaroaleman @vincepri WDYT?

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/close not-planned

[k8s-ci-robot]

@k8s-triage-robot: Closing this issue, marking it as "Not Planned".

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/close not-planned

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