✨ Make webhook setup conditional based on user provided config

[pmalek]

Make webhook configuration apply only if it's specified by the user through:

• .WebhookInstallOptions.ValidatingWebhooks
• .WebhookInstallOptions.MutatingWebhooks
• either of provided CRDs having .Spec.Conversion.Webhook set

Without this change, environments with CRDs that have multiple versions receive the following errors:

Create error: conversion webhook for apigroup.com/v1beta1, Kind=MyCustomKind failed: Post "https://127.0.0.1:59762/convert?timeout=30s": dial tcp 127.0.0.1:59762: connect: connection refused

x-ref: https://kubernetes.slack.com/archives/C02MRBMN00Z/p1763049500384929

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Skipping CI for Draft Pull Request. If you want CI signal for your change, please convert it to an actual PR. You can still manually trigger a test run with /test all

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[pmalek]

/test pull-controller-runtime-test

[sbueringer]

Am I understanding correctly that the use case is to have CRDs with multiple apiVersions without conversion? How does this work?

[k8s-ci-robot]

@pmalek: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-controller-runtime-test	6b65009604f671a37df168ec0c4e2801350dacc7	link	true	/test pull-controller-runtime-test

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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[pmalek]

Am I understanding correctly that the use case is to have CRDs with multiple apiVersions without conversion? How does this work?

For my particular use case I don't need the conversion as I'm only testing the CRD CEL expressions and not controller's behavior.

After looking at the test code in controller-runtime I came up with a stub conversion webhook server:

	ws := webhook.NewServer(webhook.Options{
		Port:    testEnv.WebhookInstallOptions.LocalServingPort,
		Host:    testEnv.WebhookInstallOptions.LocalServingHost,
		CertDir: testEnv.WebhookInstallOptions.LocalServingCertDir,
	})
	ws.Register("/convert", conversion.NewWebhookHandler(scheme))
	go func() {
		require.NoError(t, ws.Start(ctx))
	}()

which fulfilled my needs.

I think we can close this one unless there's something that I missed which would make it reasonable to skip webhook altogether for use cases like mine.

[sbueringer]

I'm mostly wondering why it just doesn't work out of the box.

If the schema is configured correctly and conversion is implemented correctly envtest should just create a fully functioning conversion endpoint

[pmalek]

I'm mostly wondering why it just doesn't work out of the box.

If the schema is configured correctly and conversion is implemented correctly envtest should just create a fully functioning conversion endpoint

For historical reference (in case someone want to debug this):

• This is the code for envtest setup: https://github.com/Kong/kong-operator/blob/5bacab4eb36d952a015ea7b6ac95507f8ca5c2f6/test/envtest/setup.go#L48-L62
• This is the scheme constructor function which is used in every test: https://github.com/Kong/kong-operator/blob/378bd036120af98ac5f5bab84ed96dcccee0b19b/modules/manager/scheme/scheme.go#L22-L43
• This is the CRD in question: https://github.com/Kong/kong-operator/blob/4ce3b776313be72315b98109d8163be5ab1d9bbb/config/crd/kong-operator/gateway-operator.konghq.com_controlplanes.yaml