🐛 Fix XValidations flattening

[cezarsa]

Fixes #997

This PR ensures XValidations are merged correctly when flattening the CRD schema.

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[sbueringer]

/ok-to-test

[JoelSpeed]

Do we need to consider the ordering in flattening? CRD validations are executed in order so do we think the field level validations or the struct level validations should come first? What will happen with this approach, I assume the output here is deterministic?

[cezarsa]

What will happen with this approach, I assume the output here is deterministic?

It is deterministic and, with the current approach, struct-level validations will come first. This kinda makes sense to me but I don't have a definitive answer if this is the intended behavior or if this has been discussed before.

Ultimately, I don't think the order can affect the correctness or the cost budget for the validations as they are all executed even after a failed rule.

[JoelSpeed]

Ultimately, I don't think the order can affect the correctness or the cost budget for the validations as they are all executed even after a failed rule.

Is that true? I was under the impression that if a rule failed, further rules were not executed until the earlier rule passed?

Either way, I guess that doesn't hugely matter since all rules must pass for the object to be accepted. I would be tempted to poke some of the API machinery folks though just in case they can foresee any issues here/have a suggestion for prioritisation

[cezarsa]

Is that true? I was under the impression that if a rule failed, further rules were not executed until the earlier rule passed?

Yes, I just tested it to be sure, using controller-gen from this branch and with an object declared as:

type FooSpec struct {
	// +kubebuilder:validation:XValidation:rule="false",message="validation 3"
	// +kubebuilder:validation:XValidation:rule="false",message="validation 4"
	Thing *Thing `json:"thing"`
}

// +kubebuilder:validation:XValidation:rule="false",message="validation 1"
// +kubebuilder:validation:XValidation:rule="false",message="validation 2"
type Thing struct {
	Field *string `json:"field"`
}

Applying it returned all the validation errors:

$  k apply -f ./example.yaml
The Foo "foo1" is invalid:
* spec.thing: Invalid value: "object": validation 1
* spec.thing: Invalid value: "object": validation 2
* spec.thing: Invalid value: "object": validation 3
* spec.thing: Invalid value: "object": validation 4