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✨ Add support to clusterctl for inserting workload kubeconfig into an existing kubeconfig file #11942

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✨ Add support to clusterctl for inserting workload kubeconfig into an existing kubeconfig file #11942

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34 changes: 34 additions & 0 deletions cmd/clusterctl/cmd/get_kubeconfig.go
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Original file line number Diff line number Diff line change
Expand Up @@ -19,9 +19,11 @@ package cmd
import (
"context"
"fmt"
"os"

"github.com/pkg/errors"
"github.com/spf13/cobra"
"k8s.io/client-go/tools/clientcmd"

clusterv1 "sigs.k8s.io/cluster-api/api/v1beta1"
"sigs.k8s.io/cluster-api/cmd/clusterctl/client"
Expand All @@ -32,6 +34,7 @@ type getKubeconfigOptions struct {
kubeconfig string
kubeconfigContext string
namespace string
intoKubeconfig string
}

var gk = &getKubeconfigOptions{}
Expand Down Expand Up @@ -67,6 +70,8 @@ func init() {
"Path to the kubeconfig file to use for accessing the management cluster. If unspecified, default discovery rules apply.")
getKubeconfigCmd.Flags().StringVar(&gk.kubeconfigContext, "kubeconfig-context", "",
"Context to be used within the kubeconfig file. If empty, current context will be used.")
getKubeconfigCmd.Flags().StringVar(&gk.intoKubeconfig, "into-kubeconfig", "",
"Path to the kubeconfig file where the resulting kubeconfig will be inserted.")

// completions
getKubeconfigCmd.ValidArgsFunction = resourceNameCompletionFunc(
Expand Down Expand Up @@ -98,6 +103,35 @@ func runGetKubeconfig(workloadClusterName string) error {
if err != nil {
return err
}
if gk.intoKubeconfig != "" {
return intoKubeconfig(gk.intoKubeconfig, out)
}

fmt.Println(out)
return nil
}

func intoKubeconfig(path, kubeconfig string) error {
kubeconfigFile, err := os.CreateTemp("", "kubeconfig")
if err != nil {
return err
}
defer os.Remove(kubeconfigFile.Name())

if _, err = kubeconfigFile.WriteString(kubeconfig); err != nil {
return err
}
if err = kubeconfigFile.Close(); err != nil {
return err
}

rules := &clientcmd.ClientConfigLoadingRules{
Precedence: []string{path, kubeconfigFile.Name()},
}
config, err := rules.Load()
if err != nil {
return err
}

return clientcmd.WriteToFile(*config, rules.Precedence[0])
}
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