1. update clientset, deepcopy using code-generator

2. add a dummy file tools.go to force "go mod vendor" to see
code-generator as dependencies
3. add a script to update CRD
4. add a README to document CRD updating steps
run go mod tidy
update README

vendor/k8s.io/client-go/tools/leaderelection/resourcelock/configmaplock.go

@@ -41,22 +41,23 @@ type ConfigMapLock struct {
 }
 
 // Get returns the election record from a ConfigMap Annotation
-func (cml *ConfigMapLock) Get() (*LeaderElectionRecord, error) {
+func (cml *ConfigMapLock) Get() (*LeaderElectionRecord, []byte, error) {
 	var record LeaderElectionRecord
 	var err error
 	cml.cm, err = cml.Client.ConfigMaps(cml.ConfigMapMeta.Namespace).Get(cml.ConfigMapMeta.Name, metav1.GetOptions{})
 	if err != nil {
-		return nil, err
+		return nil, nil, err
 	}
 	if cml.cm.Annotations == nil {
 		cml.cm.Annotations = make(map[string]string)
 	}
-	if recordBytes, found := cml.cm.Annotations[LeaderElectionRecordAnnotationKey]; found {
+	recordBytes, found := cml.cm.Annotations[LeaderElectionRecordAnnotationKey]
+	if found {
 		if err := json.Unmarshal([]byte(recordBytes), &record); err != nil {
-			return nil, err
+			return nil, nil, err
 		}
 	}
-	return &record, nil
+	return &record, []byte(recordBytes), nil
 }
 
 // Create attempts to create a LeaderElectionRecord annotation
@@ -106,7 +107,7 @@ func (cml *ConfigMapLock) Describe() string {
 	return fmt.Sprintf("%v/%v", cml.ConfigMapMeta.Namespace, cml.ConfigMapMeta.Name)
 }
 
-// returns the Identity of the lock
+// Identity returns the Identity of the lock
 func (cml *ConfigMapLock) Identity() string {
 	return cml.LockConfig.Identity
 }

vendor/k8s.io/client-go/tools/leaderelection/resourcelock/endpointslock.go

@@ -36,22 +36,23 @@ type EndpointsLock struct {
 }
 
 // Get returns the election record from a Endpoints Annotation
-func (el *EndpointsLock) Get() (*LeaderElectionRecord, error) {
+func (el *EndpointsLock) Get() (*LeaderElectionRecord, []byte, error) {
 	var record LeaderElectionRecord
 	var err error
 	el.e, err = el.Client.Endpoints(el.EndpointsMeta.Namespace).Get(el.EndpointsMeta.Name, metav1.GetOptions{})
 	if err != nil {
-		return nil, err
+		return nil, nil, err
 	}
 	if el.e.Annotations == nil {
 		el.e.Annotations = make(map[string]string)
 	}
-	if recordBytes, found := el.e.Annotations[LeaderElectionRecordAnnotationKey]; found {
+	recordBytes, found := el.e.Annotations[LeaderElectionRecordAnnotationKey]
+	if found {
 		if err := json.Unmarshal([]byte(recordBytes), &record); err != nil {
-			return nil, err
+			return nil, nil, err
 		}
 	}
-	return &record, nil
+	return &record, []byte(recordBytes), nil
 }
 
 // Create attempts to create a LeaderElectionRecord annotation
@@ -81,6 +82,9 @@ func (el *EndpointsLock) Update(ler LeaderElectionRecord) error {
 	if err != nil {
 		return err
 	}
+	if el.e.Annotations == nil {
+		el.e.Annotations = make(map[string]string)
+	}
 	el.e.Annotations[LeaderElectionRecordAnnotationKey] = string(recordBytes)
 	el.e, err = el.Client.Endpoints(el.EndpointsMeta.Namespace).Update(el.e)
 	return err
@@ -101,7 +105,7 @@ func (el *EndpointsLock) Describe() string {
 	return fmt.Sprintf("%v/%v", el.EndpointsMeta.Namespace, el.EndpointsMeta.Name)
 }
 
-// returns the Identity of the lock
+// Identity returns the Identity of the lock
 func (el *EndpointsLock) Identity() string {
 	return el.LockConfig.Identity
 }

vendor/k8s.io/client-go/tools/leaderelection/resourcelock/interface.go

@@ -30,6 +30,8 @@ const (
 	EndpointsResourceLock             = "endpoints"
 	ConfigMapsResourceLock            = "configmaps"
 	LeasesResourceLock                = "leases"
+	EndpointsLeasesResourceLock       = "endpointsleases"
+	ConfigMapsLeasesResourceLock      = "configmapsleases"
 )
 
 // LeaderElectionRecord is the record that is stored in the leader election annotation.
@@ -71,7 +73,7 @@ type ResourceLockConfig struct {
 // by the leaderelection code.
 type Interface interface {
 	// Get returns the LeaderElectionRecord
-	Get() (*LeaderElectionRecord, error)
+	Get() (*LeaderElectionRecord, []byte, error)
 
 	// Create attempts to create a LeaderElectionRecord
 	Create(ler LeaderElectionRecord) error
@@ -92,33 +94,46 @@ type Interface interface {
 
 // Manufacture will create a lock of a given type according to the input parameters
 func New(lockType string, ns string, name string, coreClient corev1.CoreV1Interface, coordinationClient coordinationv1.CoordinationV1Interface, rlc ResourceLockConfig) (Interface, error) {
+	endpointsLock := &EndpointsLock{
+		EndpointsMeta: metav1.ObjectMeta{
+			Namespace: ns,
+			Name:      name,
+		},
+		Client:     coreClient,
+		LockConfig: rlc,
+	}
+	configmapLock := &ConfigMapLock{
+		ConfigMapMeta: metav1.ObjectMeta{
+			Namespace: ns,
+			Name:      name,
+		},
+		Client:     coreClient,
+		LockConfig: rlc,
+	}
+	leaseLock := &LeaseLock{
+		LeaseMeta: metav1.ObjectMeta{
+			Namespace: ns,
+			Name:      name,
+		},
+		Client:     coordinationClient,
+		LockConfig: rlc,
+	}
 	switch lockType {
 	case EndpointsResourceLock:
-		return &EndpointsLock{
-			EndpointsMeta: metav1.ObjectMeta{
-				Namespace: ns,
-				Name:      name,
-			},
-			Client:     coreClient,
-			LockConfig: rlc,
-		}, nil
+		return endpointsLock, nil
 	case ConfigMapsResourceLock:
-		return &ConfigMapLock{
-			ConfigMapMeta: metav1.ObjectMeta{
-				Namespace: ns,
-				Name:      name,
-			},
-			Client:     coreClient,
-			LockConfig: rlc,
-		}, nil
+		return configmapLock, nil
 	case LeasesResourceLock:
-		return &LeaseLock{
-			LeaseMeta: metav1.ObjectMeta{
-				Namespace: ns,
-				Name:      name,
-			},
-			Client:     coordinationClient,
-			LockConfig: rlc,
+		return leaseLock, nil
+	case EndpointsLeasesResourceLock:
+		return &MultiLock{
+			Primary:   endpointsLock,
+			Secondary: leaseLock,
+		}, nil
+	case ConfigMapsLeasesResourceLock:
+		return &MultiLock{
+			Primary:   configmapLock,
+			Secondary: leaseLock,
 		}, nil
 	default:
 		return nil, fmt.Errorf("Invalid lock-type %s", lockType)

vendor/k8s.io/client-go/tools/leaderelection/resourcelock/leaselock.go

@@ -17,6 +17,7 @@ limitations under the License.
 package resourcelock
 
 import (
+	"encoding/json"
 	"errors"
 	"fmt"
 
@@ -36,13 +37,18 @@ type LeaseLock struct {
 }
 
 // Get returns the election record from a Lease spec
-func (ll *LeaseLock) Get() (*LeaderElectionRecord, error) {
+func (ll *LeaseLock) Get() (*LeaderElectionRecord, []byte, error) {
 	var err error
 	ll.lease, err = ll.Client.Leases(ll.LeaseMeta.Namespace).Get(ll.LeaseMeta.Name, metav1.GetOptions{})
 	if err != nil {
-		return nil, err
+		return nil, nil, err
 	}
-	return LeaseSpecToLeaderElectionRecord(&ll.lease.Spec), nil
+	record := LeaseSpecToLeaderElectionRecord(&ll.lease.Spec)
+	recordByte, err := json.Marshal(*record)
+	if err != nil {
+		return nil, nil, err
+	}
+	return record, recordByte, nil
 }
 
 // Create attempts to create a Lease
@@ -84,31 +90,30 @@ func (ll *LeaseLock) Describe() string {
 	return fmt.Sprintf("%v/%v", ll.LeaseMeta.Namespace, ll.LeaseMeta.Name)
 }
 
-// returns the Identity of the lock
+// Identity returns the Identity of the lock
 func (ll *LeaseLock) Identity() string {
 	return ll.LockConfig.Identity
 }
 
 func LeaseSpecToLeaderElectionRecord(spec *coordinationv1.LeaseSpec) *LeaderElectionRecord {
-	holderIdentity := ""
+	var r LeaderElectionRecord
 	if spec.HolderIdentity != nil {
-		holderIdentity = *spec.HolderIdentity
+		r.HolderIdentity = *spec.HolderIdentity
 	}
-	leaseDurationSeconds := 0
 	if spec.LeaseDurationSeconds != nil {
-		leaseDurationSeconds = int(*spec.LeaseDurationSeconds)
+		r.LeaseDurationSeconds = int(*spec.LeaseDurationSeconds)
 	}
-	leaseTransitions := 0
 	if spec.LeaseTransitions != nil {
-		leaseTransitions = int(*spec.LeaseTransitions)
+		r.LeaderTransitions = int(*spec.LeaseTransitions)
 	}
-	return &LeaderElectionRecord{
-		HolderIdentity:       holderIdentity,
-		LeaseDurationSeconds: leaseDurationSeconds,
-		AcquireTime:          metav1.Time{spec.AcquireTime.Time},
-		RenewTime:            metav1.Time{spec.RenewTime.Time},
-		LeaderTransitions:    leaseTransitions,
+	if spec.AcquireTime != nil {
+		r.AcquireTime = metav1.Time{spec.AcquireTime.Time}
 	}
+	if spec.RenewTime != nil {
+		r.RenewTime = metav1.Time{spec.RenewTime.Time}
+	}
+	return &r
+
 }
 
 func LeaderElectionRecordToLeaseSpec(ler *LeaderElectionRecord) coordinationv1.LeaseSpec {

vendor/k8s.io/client-go/tools/leaderelection/resourcelock/multilock.go

@@ -0,0 +1,103 @@
+/*
+Copyright 2019 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package resourcelock
+
+import (
+	"bytes"
+	"encoding/json"
+
+	apierrors "k8s.io/apimachinery/pkg/api/errors"
+)
+
+const (
+	UnknownLeader = "leaderelection.k8s.io/unknown"
+)
+
+// MultiLock is used for lock's migration
+type MultiLock struct {
+	Primary   Interface
+	Secondary Interface
+}
+
+// Get returns the older election record of the lock
+func (ml *MultiLock) Get() (*LeaderElectionRecord, []byte, error) {
+	primary, primaryRaw, err := ml.Primary.Get()
+	if err != nil {
+		return nil, nil, err
+	}
+
+	secondary, secondaryRaw, err := ml.Secondary.Get()
+	if err != nil {
+		// Lock is held by old client
+		if apierrors.IsNotFound(err) && primary.HolderIdentity != ml.Identity() {
+			return primary, primaryRaw, nil
+		}
+		return nil, nil, err
+	}
+
+	if primary.HolderIdentity != secondary.HolderIdentity {
+		primary.HolderIdentity = UnknownLeader
+		primaryRaw, err = json.Marshal(primary)
+		if err != nil {
+			return nil, nil, err
+		}
+	}
+	return primary, ConcatRawRecord(primaryRaw, secondaryRaw), nil
+}
+
+// Create attempts to create both primary lock and secondary lock
+func (ml *MultiLock) Create(ler LeaderElectionRecord) error {
+	err := ml.Primary.Create(ler)
+	if err != nil && !apierrors.IsAlreadyExists(err) {
+		return err
+	}
+	return ml.Secondary.Create(ler)
+}
+
+// Update will update and existing annotation on both two resources.
+func (ml *MultiLock) Update(ler LeaderElectionRecord) error {
+	err := ml.Primary.Update(ler)
+	if err != nil {
+		return err
+	}
+	_, _, err = ml.Secondary.Get()
+	if err != nil && apierrors.IsNotFound(err) {
+		return ml.Secondary.Create(ler)
+	}
+	return ml.Secondary.Update(ler)
+}
+
+// RecordEvent in leader election while adding meta-data
+func (ml *MultiLock) RecordEvent(s string) {
+	ml.Primary.RecordEvent(s)
+	ml.Secondary.RecordEvent(s)
+}
+
+// Describe is used to convert details on current resource lock
+// into a string
+func (ml *MultiLock) Describe() string {
+	return ml.Primary.Describe()
+}
+
+// Identity returns the Identity of the lock
+func (ml *MultiLock) Identity() string {
+	return ml.Primary.Identity()
+}
+
+func ConcatRawRecord(primaryRaw, secondaryRaw []byte) []byte {
+	return bytes.Join([][]byte{primaryRaw, secondaryRaw}, []byte(","))
+}