Either Or Kubebuilder validation for CRDs

[waveywaves]

Type of question

Best practices

General operator-related help
Open question

Question

Is there a way to add a validation for "one of" to the CRDs using the kubebuilder markers (// +kubebuilder:validation..).

Eg:
There are two parts to .spec.options. .spec.options.option1 and .spec.options.option2
User should be able to provide either .spec.options.option1 or .spec.options.option2, not both of them.
Is it possible to do this validation using the kubebuilder markers.

Maybe something like

// +kubebuilder:validation:OneOf=`.spec.options.option1`,`.spec.options.option1` 

Environment

Operator type:

/language go

Kubernetes cluster type:

Openshift / Kubernetes

$ operator-sdk version

operator-sdk version: "v1.0.1", commit: "4169b318b578156ed56530f373d328276d040a1b", kubernetes version: "v1.18.2", go version: "go1.13.15 linux/amd64", GOOS: "linux", GOARCH: "amd64"
$ go version (if language is Go)
1.14

$ kubectl version

Client Version: version.Info{Major:"1", Minor:"18", GitVersion:"v1.18.0", GitCommit:"9e991415386e4cf155a24b1da15becaa390438d8", GitTreeState:"clean", BuildDate:"2020-03-25T14:58:59Z", GoVersion:"go1.13.8", Compiler:"gc", Platform:"linux/amd64"}
Server Version: version.Info{Major:"1", Minor:"17+", GitVersion:"v1.17.1+3f6f40d", GitCommit:"3f6f40d", GitTreeState:"clean", BuildDate:"2020-06-08T07:13:25Z", GoVersion:"go1.13.4", Compiler:"gc", Platform:"linux/amd64"}

Additional context

[camilamacedo86]

Hi @waveywaves,

Is there a way to add a validation for "one of" to the CRDs using the kubebuilder markers (// +kubebuilder:validation..).

The markers are added to the _type.go file which is the file that will generate the CRD. See: https://book.kubebuilder.io/reference/markers/crd-validation.html

However, if your question is if has a way to generate the validation for a CustomResource and not for another of the same Kind(CRD) then, the answer is no. Note that, the goal of the command create api is to create Custom Resource (CR) and Custom Resource Definition (CRD) resources for the Memcached Kind. Consequently, by using the Operator SDK tool, we can create our APIs and objects that will represent our solutions on these platforms. Here will adds only a single kind of resource; however, it could have as many Kinds as needed (1…N). Basically, the CRDs are a definition of our customized Objects, and the CRs are an instance of it.

In this way, I am closing this on as sorted out.

[akhilasankar]

@waveywaves
I also have a similar requirement, where I have 2 fields in my spec. And I am expecting users to provide value to either one, not two both. How can we achieve this? Did you found a solution for this. ?