add minikube labels to kubecontext extenions

pkg/minikube/kubeconfig/settings.go

@@ -20,9 +20,11 @@ import (
 	"io/ioutil"
 	"path/filepath"
 	"sync/atomic"
+	"time"
 
 	"github.com/juju/mutex"
 	"github.com/pkg/errors"
+	"k8s.io/apimachinery/pkg/runtime"
 	"k8s.io/client-go/tools/clientcmd/api"
 	"k8s.io/klog/v2"
 	"k8s.io/minikube/pkg/util/lock"
@@ -83,6 +85,14 @@ func PopulateFromSettings(cfg *Settings, apiCfg *api.Config) error {
 	} else {
 		cluster.CertificateAuthority = cfg.CertificateAuthority
 	}
+
+	lastUpdate := time.Now().String()
+	ext := &internalExtension{
+		CreatedBy:  "minikube.sigs.k8s.io",
+		LastUpdate: lastUpdate,
+	}
+
+	cluster.Extensions = map[string]runtime.Object{"cluster_info": ext.DeepCopy()}
 	apiCfg.Clusters[clusterName] = cluster
 
 	// user
@@ -109,6 +119,7 @@ func PopulateFromSettings(cfg *Settings, apiCfg *api.Config) error {
 	context.Cluster = cfg.ClusterName
 	context.Namespace = cfg.Namespace
 	context.AuthInfo = userName
+	context.Extensions = map[string]runtime.Object{"context_info": ext.DeepCopy()}
 	apiCfg.Contexts[contextName] = context
 
 	// Only set current context to minikube if the user has not used the keepContext flag
@@ -149,3 +160,36 @@ func Update(kcs *Settings) error {
 	}
 	return nil
 }
+
+// +k8s:deepcopy-gen:interfaces=k8s.io/apimachinery/pkg/runtime.Object
+// implementing the runtime.Object internally so we can write extensions to kubeconfig
+type internalExtension struct {
+	runtime.TypeMeta `json:",inline"`
+	CreatedBy        string `json:"created_by"`
+	LastUpdate       string `json:"last_update"`
+}
+
+// DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new InternalSimple.
+func (in *internalExtension) DeepCopy() *internalExtension {
+	if in == nil {
+		return nil
+	}
+	out := new(internalExtension)
+	in.DeepCopyInto(out)
+	return out
+}
+
+// DeepCopyObject is an autogenerated deepcopy function, copying the receiver, creating a new runtime.Object.
+func (in *internalExtension) DeepCopyObject() runtime.Object {
+	if c := in.DeepCopy(); c != nil {
+		return c
+	}
+	return nil
+}
+
+// DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
+func (in *internalExtension) DeepCopyInto(out *internalExtension) {
+	*out = *in
+	out.TypeMeta = in.TypeMeta
+	return
+}