kubernetes - Patching a pvc using go client

Question

I am trying to update a pvc label using go library's patch option from this interface.

Is there any example on how to use this? Also if the label is not there will patch also add the label?

I am looking to update/add my_label in below object:

kind: PersistentVolumeClaim
metadata:
  annotations:
    pv.kubernetes.io/bind-completed: "yes"
    pv.kubernetes.io/bound-by-controller: "yes"
    volume.beta.kubernetes.io/storage-class: ""
  creationTimestamp: "2021-01-25T18:53:02Z"
  finalizers:
  - kubernetes.io/pvc-protection
  labels:
      my_label: my_value

question from:https://stackoverflow.com/questions/65927298/patching-a-pvc-using-go-client

Answer 1

It could be done the following way:

    persVolC := client.CoreV1().PersistentVolumeClaims("default")

    data := `
    [
      { "op": "add", "path": "/metadata/labels/mylabel", "value": "myvalue" }
    ]
    `
    updatedPvc, err := persVolC.Patch(ctx, "name-of-pvc", types.JSONPatchType, []byte(data), meta_v1.PatchOptions{})
    if err != nil {
        log.Fatal(err)
    }

Full example at go playground.

And here you can read about JSON patch standard.