update-codegen.sh does not install validation-gen

[grbinho]

Hi,

I'm playing around trying to create a k8s controller and I ran into this issue when trying to run code generation as described in the sample-controller repo. I'm very new to go and k8s controllers.

I ran

./hack/update-codegen.sh

and it resulted in

cannot find module providing package k8s.io/code-generator/cmd/validation-gen: import lookup disabled by -mod=vendor
        (Go version in go.mod is at least 1.14 and vendor directory exists.)

I did the go mod vendor and checked the folder for validaiton-gen and could not find it.
Some other generators were installed correctly.

I got it working by setting KUBE_CODEGEN_TAG (to v0.33.3).

Not sure if this is a bug in the kube_codegen.sh or something, just thought I check.

P.S.
I got the same result when I cloned the sample-controller repo.