adds a new generator that creates register.go files

staging/src/BUILD

@@ -188,6 +188,7 @@ filegroup(
         "//staging/src/k8s.io/code-generator/cmd/informer-gen:all-srcs",
         "//staging/src/k8s.io/code-generator/cmd/lister-gen:all-srcs",
         "//staging/src/k8s.io/code-generator/cmd/openapi-gen:all-srcs",
+        "//staging/src/k8s.io/code-generator/cmd/register-gen:all-srcs",
         "//staging/src/k8s.io/code-generator/cmd/set-gen:all-srcs",
         "//staging/src/k8s.io/code-generator/hack:all-srcs",
         "//staging/src/k8s.io/code-generator/pkg/util:all-srcs",

staging/src/k8s.io/code-generator/cmd/register-gen/BUILD

+load("@io_bazel_rules_go//go:def.bzl", "go_binary", "go_library")
+
+go_library(
+    name = "go_default_library",
+    srcs = ["main.go"],
+    importmap = "k8s.io/kubernetes/vendor/k8s.io/code-generator/cmd/register-gen",
+    importpath = "k8s.io/code-generator/cmd/register-gen",
+    visibility = ["//visibility:private"],
+    deps = [
+        "//staging/src/k8s.io/code-generator/cmd/register-gen/args:go_default_library",
+        "//staging/src/k8s.io/code-generator/cmd/register-gen/generators:go_default_library",
+        "//staging/src/k8s.io/code-generator/pkg/util:go_default_library",
+        "//vendor/github.com/golang/glog:go_default_library",
+        "//vendor/github.com/spf13/pflag:go_default_library",
+        "//vendor/k8s.io/gengo/args:go_default_library",
+    ],
+)
+
+go_binary(
+    name = "register-gen",
+    embed = [":go_default_library"],
+    visibility = ["//visibility:public"],
+)
+
+filegroup(
+    name = "package-srcs",
+    srcs = glob(["**"]),
+    tags = ["automanaged"],
+    visibility = ["//visibility:private"],
+)
+
+filegroup(
+    name = "all-srcs",
+    srcs = [
+        ":package-srcs",
+        "//staging/src/k8s.io/code-generator/cmd/register-gen/args:all-srcs",
+        "//staging/src/k8s.io/code-generator/cmd/register-gen/generators:all-srcs",
+    ],
+    tags = ["automanaged"],
+    visibility = ["//visibility:public"],
+)

staging/src/k8s.io/code-generator/cmd/register-gen/args/BUILD

+load("@io_bazel_rules_go//go:def.bzl", "go_library")
+
+go_library(
+    name = "go_default_library",
+    srcs = ["args.go"],
+    importmap = "k8s.io/kubernetes/vendor/k8s.io/code-generator/cmd/register-gen/args",
+    importpath = "k8s.io/code-generator/cmd/register-gen/args",
+    visibility = ["//visibility:public"],
+    deps = ["//vendor/k8s.io/gengo/args:go_default_library"],
+)
+
+filegroup(
+    name = "package-srcs",
+    srcs = glob(["**"]),
+    tags = ["automanaged"],
+    visibility = ["//visibility:private"],
+)
+
+filegroup(
+    name = "all-srcs",
+    srcs = [":package-srcs"],
+    tags = ["automanaged"],
+    visibility = ["//visibility:public"],
+)

staging/src/k8s.io/code-generator/cmd/register-gen/args/args.go

+/*
+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.
+*/
+
+package args
+
+import (
+	"fmt"
+
+	"k8s.io/gengo/args"
+)
+
+// NewDefaults returns default arguments for the generator.
+func NewDefaults() *args.GeneratorArgs {
+	genericArgs := args.Default().WithoutDefaultFlagParsing()
+	genericArgs.OutputFileBaseName = "zz_generated.register"
+	return genericArgs
+}
+
+// Validate checks the given arguments.
+func Validate(genericArgs *args.GeneratorArgs) error {
+	if len(genericArgs.OutputFileBaseName) == 0 {
+		return fmt.Errorf("output file base name cannot be empty")
+	}
+
+	return nil
+}

staging/src/k8s.io/code-generator/cmd/register-gen/generators/BUILD

+load("@io_bazel_rules_go//go:def.bzl", "go_library")
+
+go_library(
+    name = "go_default_library",
+    srcs = [
+        "packages.go",
+        "register_external.go",
+    ],
+    importmap = "k8s.io/kubernetes/vendor/k8s.io/code-generator/cmd/register-gen/generators",
+    importpath = "k8s.io/code-generator/cmd/register-gen/generators",
+    visibility = ["//visibility:public"],
+    deps = [
+        "//staging/src/k8s.io/code-generator/cmd/client-gen/types:go_default_library",
+        "//vendor/github.com/golang/glog:go_default_library",
+        "//vendor/k8s.io/gengo/args:go_default_library",
+        "//vendor/k8s.io/gengo/generator:go_default_library",
+        "//vendor/k8s.io/gengo/namer:go_default_library",
+        "//vendor/k8s.io/gengo/types:go_default_library",
+    ],
+)
+
+filegroup(
+    name = "package-srcs",
+    srcs = glob(["**"]),
+    tags = ["automanaged"],
+    visibility = ["//visibility:private"],
+)
+
+filegroup(
+    name = "all-srcs",
+    srcs = [":package-srcs"],
+    tags = ["automanaged"],
+    visibility = ["//visibility:public"],
+)

staging/src/k8s.io/code-generator/cmd/register-gen/generators/packages.go

+/*
+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.
+*/
+
+package generators
+
+import (
+	"fmt"
+	"os"
+	"path"
+	"strings"
+
+	"github.com/golang/glog"
+
+	clientgentypes "k8s.io/code-generator/cmd/client-gen/types"
+	"k8s.io/gengo/args"
+	"k8s.io/gengo/generator"
+	"k8s.io/gengo/namer"
+	"k8s.io/gengo/types"
+)
+
+// NameSystems returns the name system used by the generators in this package.
+func NameSystems() namer.NameSystems {
+	return namer.NameSystems{}
+}
+
+// DefaultNameSystem returns the default name system for ordering the types to be
+// processed by the generators in this package.
+func DefaultNameSystem() string {
+	return "public"
+}
+
+// Packages makes packages to generate.
+func Packages(context *generator.Context, arguments *args.GeneratorArgs) generator.Packages {
+	boilerplate, err := arguments.LoadGoBoilerplate()
+	if err != nil {
+		glog.Fatalf("Failed loading boilerplate: %v", err)
+	}
+
+	packages := generator.Packages{}
+	for _, inputDir := range arguments.InputDirs {
+		pkg := context.Universe.Package(inputDir)
+		internal, err := isInternal(pkg)
+		if err != nil {
+			glog.V(5).Infof("skipping the generation of %s file, due to err %v", arguments.OutputFileBaseName, err)
+			continue
+		}
+		if internal {
+			glog.V(5).Infof("skipping the generation of %s file because %s package contains internal types, note that internal types don't have \"json\" tags", arguments.OutputFileBaseName, pkg.Name)
+			continue
+		}
+		registerFileName := "register.go"
+		searchPath := path.Join(args.DefaultSourceTree(), inputDir, registerFileName)
+		if _, err := os.Stat(path.Join(searchPath)); err == nil {
+			glog.V(5).Infof("skipping the generation of %s file because %s already exists in the path %s", arguments.OutputFileBaseName, registerFileName, searchPath)
+			continue
+		} else if err != nil && !os.IsNotExist(err) {
+			glog.Fatalf("an error %v has occurred while checking if %s exists", err, registerFileName)
+		}
+
+		gv := clientgentypes.GroupVersion{}
+		{
+			pathParts := strings.Split(pkg.Path, "/")
+			if len(pathParts) < 2 {
+				glog.Errorf("the path of the package must contain the group name and the version, path = %s", pkg.Path)
+				continue
+			}
+			gv.Group = clientgentypes.Group(pathParts[len(pathParts)-2])
+			gv.Version = clientgentypes.Version(pathParts[len(pathParts)-1])
+
+			// if there is a comment of the form "// +groupName=somegroup" or "// +groupName=somegroup.foo.bar.io",
+			// extract the fully qualified API group name from it and overwrite the group inferred from the package path
+			if override := types.ExtractCommentTags("+", pkg.DocComments)["groupName"]; override != nil {
+				groupName := override[0]
+				glog.V(5).Infof("overriding the group name with = %s", groupName)
+				gv.Group = clientgentypes.Group(groupName)
+			}
+		}
+
+		typesToRegister := []*types.Type{}
+		for _, t := range pkg.Types {
+			glog.V(5).Infof("considering type = %s", t.Name.String())
+			for _, typeMember := range t.Members {
+				if typeMember.Name == "TypeMeta" && typeMember.Embedded == true {
+					typesToRegister = append(typesToRegister, t)
+				}
+			}
+		}
+
+		packages = append(packages,
+			&generator.DefaultPackage{
+				PackageName: pkg.Name,
+				PackagePath: pkg.Path,
+				HeaderText:  boilerplate,
+				GeneratorFunc: func(c *generator.Context) (generators []generator.Generator) {
+					return []generator.Generator{
+						&registerExternalGenerator{
+							DefaultGen: generator.DefaultGen{
+								OptionalName: arguments.OutputFileBaseName,
+							},
+							gv:              gv,
+							typesToGenerate: typesToRegister,
+							outputPackage:   pkg.Path,
+							imports:         generator.NewImportTracker(),
+						},
+					}
+				},
+			})
+	}
+
+	return packages
+}
+
+// isInternal determines whether the given package
+// contains the internal types or not
+func isInternal(p *types.Package) (bool, error) {
+	for _, t := range p.Types {
+		for _, member := range t.Members {
+			if member.Name == "TypeMeta" {
+				return !strings.Contains(member.Tags, "json"), nil
+			}
+		}
+	}
+	return false, fmt.Errorf("unable to find TypeMeta for any types in package %s", p.Path)
+}

staging/src/k8s.io/code-generator/cmd/register-gen/generators/register_external.go

+/*
+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.
+*/
+
+package generators
+
+import (
+	"io"
+	"sort"
+
+	clientgentypes "k8s.io/code-generator/cmd/client-gen/types"
+	"k8s.io/gengo/generator"
+	"k8s.io/gengo/namer"
+	"k8s.io/gengo/types"
+)
+
+type registerExternalGenerator struct {
+	generator.DefaultGen
+	outputPackage   string
+	gv              clientgentypes.GroupVersion
+	typesToGenerate []*types.Type
+	imports         namer.ImportTracker
+}
+
+var _ generator.Generator = &registerExternalGenerator{}
+
+func (g *registerExternalGenerator) Filter(_ *generator.Context, _ *types.Type) bool {
+	return false
+}
+
+func (g *registerExternalGenerator) Imports(c *generator.Context) (imports []string) {
+	return g.imports.ImportLines()
+}
+
+func (g *registerExternalGenerator) Namers(_ *generator.Context) namer.NameSystems {
+	return namer.NameSystems{
+		"raw": namer.NewRawNamer(g.outputPackage, g.imports),
+	}
+}
+
+func (g *registerExternalGenerator) Finalize(context *generator.Context, w io.Writer) error {
+	typesToGenerateOnlyNames := make([]string, len(g.typesToGenerate))
+	for index, typeToGenerate := range g.typesToGenerate {
+		typesToGenerateOnlyNames[index] = typeToGenerate.Name.Name
+	}
+
+	// sort the list of types to register, so that the generator produces stable output
+	sort.Strings(typesToGenerateOnlyNames)
+
+	sw := generator.NewSnippetWriter(w, context, "$", "$")
+	m := map[string]interface{}{
+		"groupName":         g.gv.Group,
+		"version":           g.gv.Version,
+		"types":             typesToGenerateOnlyNames,
+		"addToGroupVersion": context.Universe.Function(types.Name{Package: "k8s.io/apimachinery/pkg/apis/meta/v1", Name: "AddToGroupVersion"}),
+		"groupVersion":      context.Universe.Type(types.Name{Package: "k8s.io/apimachinery/pkg/apis/meta/v1", Name: "GroupVersion"}),
+	}
+	sw.Do(registerExternalTypesTemplate, m)
+	return sw.Error()
+}
+
+var registerExternalTypesTemplate = `
+// GroupName specifies the group name used to register the objects.
+const GroupName = "$.groupName$"
+
+// GroupVersion specifies the group and the version used to register the objects.
+var GroupVersion = $.groupVersion|raw${Group: GroupName, Version: "$.version$"}
+
+// SchemeGroupVersion is group version used to register these objects
+// Deprecated: use GroupVersion instead.
+var SchemeGroupVersion = schema.GroupVersion{Group: GroupName, Version: "$.version$"}
+
+// Resource takes an unqualified resource and returns a Group qualified GroupResource
+func Resource(resource string) schema.GroupResource {
+	return SchemeGroupVersion.WithResource(resource).GroupResource()
+}
+
+var (
+	// localSchemeBuilder and AddToScheme will stay in k8s.io/kubernetes.
+	SchemeBuilder      runtime.SchemeBuilder
+	localSchemeBuilder = &SchemeBuilder
+    // Depreciated: use Install instead
+	AddToScheme        = localSchemeBuilder.AddToScheme
+	Install            = localSchemeBuilder.AddToScheme
+)
+
+func init() {
+	// We only register manually written functions here. The registration of the
+	// generated functions takes place in the generated files. The separation
+	// makes the code compile even when the generated files are missing.
+	localSchemeBuilder.Register(addKnownTypes)
+}
+
+// Adds the list of known types to Scheme.
+func addKnownTypes(scheme *runtime.Scheme) error {
+	scheme.AddKnownTypes(SchemeGroupVersion,
+    $range .types -$
+        &$.${},
+    $end$
+	)
+    // AddToGroupVersion allows the serialization of client types like ListOptions.
+	$.addToGroupVersion|raw$(scheme, SchemeGroupVersion)
+	return nil
+}
+`

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

+/*
+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.
+*/
+
+package main
+
+import (
+	"flag"
+	"path/filepath"
+
+	"github.com/golang/glog"
+	"github.com/spf13/pflag"
+
+	generatorargs "k8s.io/code-generator/cmd/register-gen/args"
+	"k8s.io/code-generator/cmd/register-gen/generators"
+	"k8s.io/code-generator/pkg/util"
+	"k8s.io/gengo/args"
+)
+
+func main() {
+	genericArgs := generatorargs.NewDefaults()
+	genericArgs.GoHeaderFilePath = filepath.Join(args.DefaultSourceTree(), util.BoilerplatePath())
+	genericArgs.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)
+	}
+
+	if err := genericArgs.Execute(
+		generators.NameSystems(),
+		generators.DefaultNameSystem(),
+		generators.Packages,
+	); err != nil {
+		glog.Fatalf("Error: %v", err)
+	}
+	glog.V(2).Info("Completed successfully.")
+}