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/apis/volumesnapshot/v1beta1/zz_generated.deepcopy.go

@@ -2,10 +2,13 @@
 
 /*
 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.
@@ -13,12 +16,12 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-// Code generated by controller-gen. DO NOT EDIT.
+// Code generated by deepcopy-gen. DO NOT EDIT.
 
 package v1beta1
 
 import (
-	"k8s.io/apimachinery/pkg/runtime"
+	runtime "k8s.io/apimachinery/pkg/runtime"
 )
 
 // DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
@@ -32,6 +35,7 @@ func (in *VolumeSnapshot) DeepCopyInto(out *VolumeSnapshot) {
 		*out = new(VolumeSnapshotStatus)
 		(*in).DeepCopyInto(*out)
 	}
+	return
 }
 
 // DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new VolumeSnapshot.
@@ -64,6 +68,7 @@ func (in *VolumeSnapshotClass) DeepCopyInto(out *VolumeSnapshotClass) {
 			(*out)[key] = val
 		}
 	}
+	return
 }
 
 // DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new VolumeSnapshotClass.
@@ -96,6 +101,7 @@ func (in *VolumeSnapshotClassList) DeepCopyInto(out *VolumeSnapshotClassList) {
 			(*in)[i].DeepCopyInto(&(*out)[i])
 		}
 	}
+	return
 }
 
 // DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new VolumeSnapshotClassList.
@@ -127,6 +133,7 @@ func (in *VolumeSnapshotContent) DeepCopyInto(out *VolumeSnapshotContent) {
 		*out = new(VolumeSnapshotContentStatus)
 		(*in).DeepCopyInto(*out)
 	}
+	return
 }
 
 // DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new VolumeSnapshotContent.
@@ -159,6 +166,7 @@ func (in *VolumeSnapshotContentList) DeepCopyInto(out *VolumeSnapshotContentList
 			(*in)[i].DeepCopyInto(&(*out)[i])
 		}
 	}
+	return
 }
 
 // DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new VolumeSnapshotContentList.
@@ -192,6 +200,7 @@ func (in *VolumeSnapshotContentSource) DeepCopyInto(out *VolumeSnapshotContentSo
 		*out = new(string)
 		**out = **in
 	}
+	return
 }
 
 // DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new VolumeSnapshotContentSource.
@@ -214,6 +223,7 @@ func (in *VolumeSnapshotContentSpec) DeepCopyInto(out *VolumeSnapshotContentSpec
 		**out = **in
 	}
 	in.Source.DeepCopyInto(&out.Source)
+	return
 }
 
 // DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new VolumeSnapshotContentSpec.
@@ -254,6 +264,7 @@ func (in *VolumeSnapshotContentStatus) DeepCopyInto(out *VolumeSnapshotContentSt
 		*out = new(VolumeSnapshotError)
 		(*in).DeepCopyInto(*out)
 	}
+	return
 }
 
 // DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new VolumeSnapshotContentStatus.
@@ -278,6 +289,7 @@ func (in *VolumeSnapshotError) DeepCopyInto(out *VolumeSnapshotError) {
 		*out = new(string)
 		**out = **in
 	}
+	return
 }
 
 // DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new VolumeSnapshotError.
@@ -302,6 +314,7 @@ func (in *VolumeSnapshotList) DeepCopyInto(out *VolumeSnapshotList) {
 			(*in)[i].DeepCopyInto(&(*out)[i])
 		}
 	}
+	return
 }
 
 // DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new VolumeSnapshotList.
@@ -335,6 +348,7 @@ func (in *VolumeSnapshotSource) DeepCopyInto(out *VolumeSnapshotSource) {
 		*out = new(string)
 		**out = **in
 	}
+	return
 }
 
 // DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new VolumeSnapshotSource.
@@ -356,6 +370,7 @@ func (in *VolumeSnapshotSpec) DeepCopyInto(out *VolumeSnapshotSpec) {
 		*out = new(string)
 		**out = **in
 	}
+	return
 }
 
 // DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new VolumeSnapshotSpec.
@@ -395,6 +410,7 @@ func (in *VolumeSnapshotStatus) DeepCopyInto(out *VolumeSnapshotStatus) {
 		*out = new(VolumeSnapshotError)
 		(*in).DeepCopyInto(*out)
 	}
+	return
 }
 
 // DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new VolumeSnapshotStatus.

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"