Use `kube-codegen.sh` instead of `generate-groups.sh` when moving to k8s.io api `0.28+`

[andrew-su]

As of k8s.io/code-generator@v0.28.0, the script generate-groups.sh is deprecated and we should move to using kube-codegen.sh

[andrew-su]

Related: #335

[cardil]

The Kube v0.30 removed the generate-groups.sh contents, which in turn renders Knative code-generation broken.

Knative already rolled to Kube v0.30, for example: knative/serving#15462, knative/eventing#8126, so this essentailly prevents changes to any Knative CRDs.

As discussed in the Productivity WG, I will create a generate-groups like tool in Knative ASAP, and notify Knative working groups on migration steps in all the Knative projects, that use code-gen.

/assign
/kind bug

[matzew]

Thanks a lot, @cardil

[cardil]

Some maintainers already started doing the migration to kube_codegen.sh script:

• Migrate to kube_codegen.sh knative-extensions/eventing-istio#486
• Migrate to kube_codegen.sh eventing#8183
• Get code generation to work again using kube_codegen.sh knative-extensions/security-guard#312

And because it looks like it shouldn't be super hard, we decided it makes sense to just go with it, so the interim generate-groups.sh shim (that I proposed on Productivity WG) wouldn't be required.

We created the doc to track the migration effort: https://docs.google.com/spreadsheets/d/12OG7kLYlJIz-vOKihdtG1Vtrg0OsD8vF_umJLFK0_kQ

/close

[knative-prow]

@cardil: Closing this issue.

Details

In response to this:

Some maintainers already started doing the migration to kube_codegen.sh script:

• Migrate to kube_codegen.sh knative-extensions/eventing-istio#486
• Migrate to kube_codegen.sh eventing#8183
• Get code generation to work again using kube_codegen.sh knative-extensions/security-guard#312

And because it looks like it shouldn't be super hard, we decided it makes sense to just go with it, so the interim generate-groups.sh shim (that I proposed on Productivity WG) wouldn't be required.

We created the doc to track the migration effort: https://docs.google.com/spreadsheets/d/12OG7kLYlJIz-vOKihdtG1Vtrg0OsD8vF_umJLFK0_kQ

/close

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