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

pkg/client/clientset/versioned/clientset.go

@@ -19,6 +19,8 @@ limitations under the License.
 package versioned
 
 import (
+	"fmt"
+
 	snapshotv1beta1 "github.com/kubernetes-csi/external-snapshotter/pkg/client/clientset/versioned/typed/volumesnapshot/v1beta1"
 	discovery "k8s.io/client-go/discovery"
 	rest "k8s.io/client-go/rest"
@@ -51,9 +53,14 @@ func (c *Clientset) Discovery() discovery.DiscoveryInterface {
 }
 
 // NewForConfig creates a new Clientset for the given config.
+// If config's RateLimiter is not set and QPS and Burst are acceptable,
+// NewForConfig will generate a rate-limiter in configShallowCopy.
 func NewForConfig(c *rest.Config) (*Clientset, error) {
 	configShallowCopy := *c
 	if configShallowCopy.RateLimiter == nil && configShallowCopy.QPS > 0 {
+		if configShallowCopy.Burst <= 0 {
+			return nil, fmt.Errorf("Burst is required to be greater than 0 when RateLimiter is not set and QPS is set to greater than 0")
+		}
 		configShallowCopy.RateLimiter = flowcontrol.NewTokenBucketRateLimiter(configShallowCopy.QPS, configShallowCopy.Burst)
 	}
 	var cs Clientset

pkg/client/clientset/versioned/fake/clientset_generated.go

@@ -41,7 +41,7 @@ func NewSimpleClientset(objects ...runtime.Object) *Clientset {
 		}
 	}
 
-	cs := &Clientset{}
+	cs := &Clientset{tracker: o}
 	cs.discovery = &fakediscovery.FakeDiscovery{Fake: &cs.Fake}
 	cs.AddReactor("*", "*", testing.ObjectReaction(o))
 	cs.AddWatchReactor("*", func(action testing.Action) (handled bool, ret watch.Interface, err error) {
@@ -63,12 +63,17 @@ func NewSimpleClientset(objects ...runtime.Object) *Clientset {
 type Clientset struct {
 	testing.Fake
 	discovery *fakediscovery.FakeDiscovery
+	tracker   testing.ObjectTracker
 }
 
 func (c *Clientset) Discovery() discovery.DiscoveryInterface {
 	return c.discovery
 }
 
+func (c *Clientset) Tracker() testing.ObjectTracker {
+	return c.tracker
+}
+
 var _ clientset.Interface = &Clientset{}
 
 // SnapshotV1beta1 retrieves the SnapshotV1beta1Client

pkg/client/clientset/versioned/typed/volumesnapshot/v1beta1/volumesnapshot_client.go

@@ -21,7 +21,6 @@ package v1beta1
 import (
 	v1beta1 "github.com/kubernetes-csi/external-snapshotter/pkg/apis/volumesnapshot/v1beta1"
 	"github.com/kubernetes-csi/external-snapshotter/pkg/client/clientset/versioned/scheme"
-	serializer "k8s.io/apimachinery/pkg/runtime/serializer"
 	rest "k8s.io/client-go/rest"
 )
 
@@ -81,7 +80,7 @@ func setConfigDefaults(config *rest.Config) error {
 	gv := v1beta1.SchemeGroupVersion
 	config.GroupVersion = &gv
 	config.APIPath = "/apis"
-	config.NegotiatedSerializer = serializer.DirectCodecFactory{CodecFactory: scheme.Codecs}
+	config.NegotiatedSerializer = scheme.Codecs.WithoutConversion()
 
 	if config.UserAgent == "" {
 		config.UserAgent = rest.DefaultKubernetesUserAgent()

pkg/client/informers/externalversions/volumesnapshot/interface.go

@@ -16,7 +16,7 @@ limitations under the License.
 
 // Code generated by informer-gen. DO NOT EDIT.
 
-package snapshot
+package volumesnapshot
 
 import (
 	internalinterfaces "github.com/kubernetes-csi/external-snapshotter/pkg/client/informers/externalversions/internalinterfaces"