Controller-gen crd doesn't allow to override the type of a field with multiple types

[juanluisvaladas]

Currently a field in a struct can override its type with the marker +kubebuilder:validation:Type=<type>. I have a use case where I want to allow multiple types such as boolean and string. This could be achieved by defining the Parser's Schemata as:

apiext.JSONSchemaProps{
	AnyOf: []apiext.JSONSchemaProps{
		{Type: "boolean"},
		{Type: "string"},
	},
}

And it's currently done in the types k8s.io/apimachinery/pkg/api/resource.Quantity and k8s.io/apimachinery/pkg/util/intstr.IntOrString. However this is hardcoded and very limiting.

What I propose is adding a new validation marker called types which works by defining +kubebuilder:validation:Types=<Type1>[;Type2[;Type3...]]

I'm aware of #461 but I don't think they are mutually exclusive and I'm pretty sure that I can implement this in a reasonable amount of time.

[juanluisvaladas]

I'm closing this issue as I don´t think this is actually feasible without making big changes in the schema validation. I don´t see a way to do this without changing fundamental aspects of it which I doubt the community would accept.

The schema validator skips a bunch of validations in the event of IntOrString so even if the schema is generated correctly the apiserver will not accept it anyway.