Replace reading admin.conf with reading output of "k0s kubeconfig admin"

Signed-off-by: Kimmo Lehto <[email protected]>

phase/get_kubeconfig.go

@@ -4,8 +4,10 @@ import (
 	"fmt"
 	"strings"
 
+	"github.com/alessio/shellescape"
 	"github.com/k0sproject/dig"
 	"github.com/k0sproject/k0sctl/pkg/apis/k0sctl.k0sproject.io/v1beta1/cluster"
+	"github.com/k0sproject/rig/exec"
 	"gopkg.in/yaml.v2"
 	"k8s.io/client-go/tools/clientcmd"
 )
@@ -22,7 +24,11 @@ func (p *GetKubeconfig) Title() string {
 }
 
 var readKubeconfig = func(h *cluster.Host) (string, error) {
-	return h.Configurer.ReadFile(h, h.Configurer.KubeconfigPath(h, h.K0sDataDir()))
+	output, err := h.ExecOutput(h.Configurer.K0sCmdf("kubeconfig admin --data-dir=%s", shellescape.Quote(h.K0sDataDir())), exec.Sudo(h))
+	if err != nil {
+		return "", fmt.Errorf("get kubeconfig from host: %w", err)
+	}
+	return output, nil
 }
 
 var k0sConfig = func(h *cluster.Host) (dig.Mapping, error) {