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/apimachinery/pkg/util/json/json.go

@@ -19,6 +19,7 @@ package json
 import (
 	"bytes"
 	"encoding/json"
+	"fmt"
 	"io"
 )
 
@@ -34,6 +35,9 @@ func Marshal(v interface{}) ([]byte, error) {
 	return json.Marshal(v)
 }
 
+// limit recursive depth to prevent stack overflow errors
+const maxDepth = 10000
+
 // Unmarshal unmarshals the given data
 // If v is a *map[string]interface{}, numbers are converted to int64 or float64
 func Unmarshal(data []byte, v interface{}) error {
@@ -48,7 +52,7 @@ func Unmarshal(data []byte, v interface{}) error {
 			return err
 		}
 		// If the decode succeeds, post-process the map to convert json.Number objects to int64 or float64
-		return convertMapNumbers(*v)
+		return convertMapNumbers(*v, 0)
 
 	case *[]interface{}:
 		// Build a decoder from the given data
@@ -60,7 +64,7 @@ func Unmarshal(data []byte, v interface{}) error {
 			return err
 		}
 		// If the decode succeeds, post-process the map to convert json.Number objects to int64 or float64
-		return convertSliceNumbers(*v)
+		return convertSliceNumbers(*v, 0)
 
 	default:
 		return json.Unmarshal(data, v)
@@ -69,16 +73,20 @@ func Unmarshal(data []byte, v interface{}) error {
 
 // convertMapNumbers traverses the map, converting any json.Number values to int64 or float64.
 // values which are map[string]interface{} or []interface{} are recursively visited
-func convertMapNumbers(m map[string]interface{}) error {
+func convertMapNumbers(m map[string]interface{}, depth int) error {
+	if depth > maxDepth {
+		return fmt.Errorf("exceeded max depth of %d", maxDepth)
+	}
+
 	var err error
 	for k, v := range m {
 		switch v := v.(type) {
 		case json.Number:
 			m[k], err = convertNumber(v)
 		case map[string]interface{}:
-			err = convertMapNumbers(v)
+			err = convertMapNumbers(v, depth+1)
 		case []interface{}:
-			err = convertSliceNumbers(v)
+			err = convertSliceNumbers(v, depth+1)
 		}
 		if err != nil {
 			return err
@@ -89,16 +97,20 @@ func convertMapNumbers(m map[string]interface{}) error {
 
 // convertSliceNumbers traverses the slice, converting any json.Number values to int64 or float64.
 // values which are map[string]interface{} or []interface{} are recursively visited
-func convertSliceNumbers(s []interface{}) error {
+func convertSliceNumbers(s []interface{}, depth int) error {
+	if depth > maxDepth {
+		return fmt.Errorf("exceeded max depth of %d", maxDepth)
+	}
+
 	var err error
 	for i, v := range s {
 		switch v := v.(type) {
 		case json.Number:
 			s[i], err = convertNumber(v)
 		case map[string]interface{}:
-			err = convertMapNumbers(v)
+			err = convertMapNumbers(v, depth+1)
 		case []interface{}:
-			err = convertSliceNumbers(v)
+			err = convertSliceNumbers(v, depth+1)
 		}
 		if err != nil {
 			return err