Custom resource definition

Co-authored-by: Mathieu Lonjaret <mathieu.lonjaret@gmail.com>

vendor/k8s.io/code-generator/cmd/openapi-gen/README

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+# Generate OpenAPI definitions
+
+- 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 or a member from a tagged package/type, add "+k8s:openapi-gen=false" tag to the comment lines.
+
+# OpenAPI Extensions
+OpenAPI spec can have extensions on types. To define one or more extensions on a type or its member
+add "+k8s:openapi-gen=x-kubernetes-$NAME:$VALUE" to the comment lines before type/member. A type/member can
+have multiple extensions. The rest of the line in the comment will be used as $VALUE so there is no need to
+escape or quote the value string. Extensions can be use to pass more information to client generators or
+documentation generators. For example a type my have a friendly name to be displayed in documentation or
+being used in a client's fluent interface.
+

vendor/k8s.io/code-generator/cmd/openapi-gen/args/args.go

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+/*
+Copyright 2016 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 args
+
+import (
+	"fmt"
+
+	"github.com/spf13/pflag"
+	"k8s.io/gengo/args"
+)
+
+// CustomArgs is used by the gengo framework to pass args specific to this generator.
+type CustomArgs struct{}
+
+// NewDefaults returns default arguments for the generator.
+func NewDefaults() (*args.GeneratorArgs, *CustomArgs) {
+	genericArgs := args.Default().WithoutDefaultFlagParsing()
+	customArgs := &CustomArgs{}
+	genericArgs.CustomArgs = customArgs
+	genericArgs.OutputFileBaseName = "openapi_generated"
+	return genericArgs, customArgs
+}
+
+// AddFlags add the generator flags to the flag set.
+func (ca *CustomArgs) AddFlags(fs *pflag.FlagSet) {}
+
+// Validate checks the given arguments.
+func Validate(genericArgs *args.GeneratorArgs) error {
+	_ = genericArgs.CustomArgs.(*CustomArgs)
+
+	if len(genericArgs.OutputFileBaseName) == 0 {
+		return fmt.Errorf("output file base name cannot be empty")
+	}
+	if len(genericArgs.OutputPackagePath) == 0 {
+		return fmt.Errorf("output package cannot be empty")
+	}
+
+	return nil
+}

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

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+/*
+Copyright 2016 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"
+	"path/filepath"
+
+	"github.com/golang/glog"
+	"github.com/spf13/pflag"
+	"k8s.io/gengo/args"
+	"k8s.io/kube-openapi/pkg/generators"
+
+	generatorargs "k8s.io/code-generator/cmd/openapi-gen/args"
+	"k8s.io/code-generator/pkg/util"
+)
+
+func main() {
+	genericArgs, customArgs := generatorargs.NewDefaults()
+
+	// Override defaults.
+	// TODO: move this out of openapi-gen
+	genericArgs.GoHeaderFilePath = filepath.Join(args.DefaultSourceTree(), util.BoilerplatePath())
+
+	genericArgs.AddFlags(pflag.CommandLine)
+	customArgs.AddFlags(pflag.CommandLine)
+	flag.Set("logtostderr", "true")
+	pflag.CommandLine.AddGoFlagSet(flag.CommandLine)
+	pflag.Parse()
+
+	if err := generatorargs.Validate(genericArgs); err != nil {
+		glog.Fatalf("Error: %v", err)
+	}
+
+	// Run it.
+	if err := genericArgs.Execute(
+		generators.NameSystems(),
+		generators.DefaultNameSystem(),
+		generators.Packages,
+	); err != nil {
+		glog.Fatalf("Error: %v", err)
+	}
+	glog.V(2).Info("Completed successfully.")
+}