How to get current namespace of an out-cluster go Kubernetes client?

Question

How can I get the current namespace of an out-of-cluster Go Kubernetes client using the client-go library?

I am using this code example: https://github.com/kubernetes/client-go/blob/master/examples/out-of-cluster-client-configuration/main.go for out-cluster client.

Here is an extract of my KUBECONFIG which might help in clarifying:

- context:
    cluster: kind-kind
    namespace: mynamespace
    user: kind-kind
  name: kind-kind
current-context: kind-kind

I'd like to find an easy way to retrieve mynamespace.

Answer 1

Thanks to @rick-rackow answer and comment, I was able to improve my understanding of the kubeconfig API, so here is a simple solution which works fine for me:

package main

import (
    "flag"
    "fmt"
    "path/filepath"

    "k8s.io/client-go/tools/clientcmd"
    "k8s.io/client-go/util/homedir"
)

func main() {
    var kubeconfig *string
    if home := homedir.HomeDir(); home != "" {
        kubeconfig = flag.String("kubeconfig", filepath.Join(home, ".kube", "config"), "(optional) absolute path to the kubeconfig file")
    } else {
        kubeconfig = flag.String("kubeconfig", "", "absolute path to the kubeconfig file")
    }
    flag.Parse()

    ns := getCurrentNamespace(*kubeconfig)
    fmt.Printf("NAMESPACE: %s", ns)
}

// Get the default namespace specified in the KUBECONFIG file current context
func getCurrentNamespace(kubeconfig string) string {

    config, err := clientcmd.LoadFromFile(kubeconfig)
    if err != nil {
        panic(err.Error())
    }
    ns := config.Contexts[config.CurrentContext].Namespace

    if len(ns) == 0 {
        ns = "default"
    }

    return ns
}