Get rid of code-generator/cmd/openapi-gen

It's an exact duplicate of k8s.io/kube-openapi/cmd/openapi-gen.

hack/update-codegen.sh

@@ -472,7 +472,7 @@ function k8s_tag_files_except() {
 function codegen::openapi() {
     # Build the tool.
     GOPROXY=off go install \
-        k8s.io/code-generator/cmd/openapi-gen
+        k8s.io/kube-openapi/cmd/openapi-gen
 
     # The result file, in each pkg, of open-api generation.
     local output_file="${GENERATED_FILE_PREFIX}openapi.go"

staging/src/k8s.io/code-generator/cmd/openapi-gen/main.go

@@ -1,62 +0,0 @@
-/*
-Copyright 2018 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.
-*/
-
-// This package generates openAPI definition file to be used in open API spec generation on API servers. To generate
-// definition for a specific type or package add "+k8s:openapi-gen=true" tag to the type/package comment lines. To
-// exclude a type from a tagged package, add "+k8s:openapi-gen=false" tag to the type comment lines.
-
-package main
-
-import (
-	"flag"
-	"log"
-
-	"github.com/spf13/pflag"
-	"k8s.io/gengo/v2"
-	"k8s.io/gengo/v2/generator"
-	"k8s.io/klog/v2"
-	"k8s.io/kube-openapi/cmd/openapi-gen/args"
-	"k8s.io/kube-openapi/pkg/generators"
-)
-
-func main() {
-	klog.InitFlags(nil)
-	args := args.New()
-
-	args.AddFlags(pflag.CommandLine)
-	flag.Set("logtostderr", "true")
-	pflag.CommandLine.AddGoFlagSet(flag.CommandLine)
-	pflag.Parse()
-
-	if err := args.Validate(); err != nil {
-		log.Fatalf("Arguments validation error: %v", err)
-	}
-
-	myTargets := func(context *generator.Context) []generator.Target {
-		return generators.GetTargets(context, args)
-	}
-
-	// Generates the code for the OpenAPIDefinitions.
-	if err := gengo.Execute(
-		generators.NameSystems(),
-		generators.DefaultNameSystem(),
-		myTargets,
-		gengo.StdBuildTag,
-		pflag.Args(),
-	); err != nil {
-		log.Fatalf("OpenAPI code generation error: %v", err)
-	}
-}

staging/src/k8s.io/code-generator/kube_codegen.sh

@@ -327,7 +327,7 @@ function kube::codegen::gen_openapi() {
             openapi-gen
         )
         # shellcheck disable=2046 # printf word-splitting is intentional
-        GO111MODULE=on go install $(printf "k8s.io/code-generator/cmd/%s " "${BINS[@]}")
+        GO111MODULE=on go install $(printf "k8s.io/kube-openapi/cmd/%s " "${BINS[@]}")
     )
     # Go installs in $GOBIN if defined, and $GOPATH/bin otherwise
     gobin="${GOBIN:-$(go env GOPATH)/bin}"

staging/src/k8s.io/code-generator/tools.go

@@ -30,6 +30,5 @@ import (
 	_ "k8s.io/code-generator/cmd/go-to-protobuf"
 	_ "k8s.io/code-generator/cmd/informer-gen"
 	_ "k8s.io/code-generator/cmd/lister-gen"
-	_ "k8s.io/code-generator/cmd/openapi-gen"
 	_ "k8s.io/code-generator/cmd/register-gen"
 )