DeepCopy should only generate types in k8s.io/kubernetes

Also make generation more selective (require opt in) to prevent lots of
unnecessary generated deep copies.

cmd/libs/go2idl/args/args.go

@@ -97,6 +97,7 @@ func (g *GeneratorArgs) NewBuilder() (*parser.Builder, error) {
 	b.AddBuildTags("ignore_autogenerated")
 
 	for _, d := range g.InputDirs {
+		d = strings.TrimLeft(d, "+-*")
 		if g.Recursive {
 			if err := b.AddDirRecursive(d); err != nil {
 				return nil, fmt.Errorf("unable to add directory %q: %v", d, err)

cmd/libs/go2idl/deepcopy-gen/generators/deepcopy.go

@@ -19,6 +19,7 @@ package generators
 import (
 	"fmt"
 	"io"
+	"path"
 	"path/filepath"
 	"strings"
 
@@ -31,6 +32,15 @@ import (
 	"github.com/golang/glog"
 )
 
+// Constraints is a set of optional limitations on what deep copy will generate.
+type Constraints struct {
+	// PackageConstraints is an optional set of package prefixes that constrain which types
+	// will have inline deep copy methods generated for. Any type outside of these packages
+	// (if specified) will not have a function generated and will result in a call to the
+	// cloner.DeepCopy method.
+	PackageConstraints []string
+}
+
 // TODO: This is created only to reduce number of changes in a single PR.
 // Remove it and use PublicNamer instead.
 func deepCopyNamer() *namer.NameStrategy {
@@ -62,7 +72,32 @@ func Packages(context *generator.Context, arguments *args.GeneratorArgs) generat
 		glog.Fatalf("Failed loading boilerplate: %v", err)
 	}
 
-	inputs := sets.NewString(arguments.InputDirs...)
+	initInputs := sets.NewString()
+	explicitInputs := sets.NewString()
+	inputs := sets.NewString()
+	for _, s := range arguments.InputDirs {
+		switch {
+		case strings.HasPrefix(s, "+"):
+			// packages with '+' prefix get functions generated for everything except gencopy=false, but
+			// no init function
+			s = strings.TrimPrefix(s, "+")
+			inputs.Insert(s)
+		case strings.HasPrefix(s, "-"):
+			// packages with '-' prefix only get functions generated for those with gencopy=true
+			s = strings.TrimPrefix(s, "-")
+			inputs.Insert(s)
+			explicitInputs.Insert(s)
+		default:
+			inputs.Insert(s)
+			initInputs.Insert(s)
+		}
+	}
+
+	var restrictRange []string
+	if c, ok := arguments.CustomArgs.(Constraints); ok {
+		restrictRange = c.PackageConstraints
+	}
+
 	packages := generator.Packages{}
 	header := append([]byte(
 		`// +build !ignore_autogenerated
@@ -76,11 +111,29 @@ func Packages(context *generator.Context, arguments *args.GeneratorArgs) generat
 	for _, p := range context.Universe {
 		copyableType := false
 		for _, t := range p.Types {
-			if copyableWithinPackage(t) && inputs.Has(t.Name.Package) {
+			if copyableWithinPackage(t, explicitInputs.Has(t.Name.Package)) && inputs.Has(t.Name.Package) {
 				copyableType = true
 			}
 		}
 		if copyableType {
+			// TODO: replace this with a more sophisticated algorithm that generates private copy methods
+			// (like auto_DeepCopy_...) for any type that is outside of the PackageConstraints. That would
+			// avoid having to make a reflection call.
+			canInlineTypeFn := func(c *generator.Context, t *types.Type) bool {
+				// types must be public structs or have a custom DeepCopy_<method> already defined
+				if !copyableWithinPackage(t, explicitInputs.Has(t.Name.Package)) && !publicCopyFunctionDefined(c, t) {
+					return false
+				}
+
+				// only packages within the restricted range can be inlined
+				for _, s := range restrictRange {
+					if strings.HasPrefix(t.Name.Package, s) {
+						return true
+					}
+				}
+				return false
+			}
+
 			path := p.Path
 			packages = append(packages,
 				&generator.DefaultPackage{
@@ -90,7 +143,7 @@ func Packages(context *generator.Context, arguments *args.GeneratorArgs) generat
 					GeneratorFunc: func(c *generator.Context) (generators []generator.Generator) {
 						generators = []generator.Generator{}
 						generators = append(
-							generators, NewGenDeepCopy("deep_copy_generated", path, inputs.Has(path)))
+							generators, NewGenDeepCopy("deep_copy_generated", path, initInputs.Has(path), explicitInputs.Has(path), canInlineTypeFn))
 						return generators
 					},
 					FilterFunc: func(c *generator.Context, t *types.Type) bool {
@@ -102,6 +155,9 @@ func Packages(context *generator.Context, arguments *args.GeneratorArgs) generat
 	return packages
 }
 
+// CanInlineTypeFunc should return true if the provided type can be converted to a function call
+type CanInlineTypeFunc func(*generator.Context, *types.Type) bool
+
 const (
 	apiPackagePath        = "k8s.io/kubernetes/pkg/api"
 	conversionPackagePath = "k8s.io/kubernetes/pkg/conversion"
@@ -110,23 +166,30 @@ const (
 // genDeepCopy produces a file with autogenerated deep-copy functions.
 type genDeepCopy struct {
 	generator.DefaultGen
-	targetPackage    string
-	imports          namer.ImportTracker
-	typesForInit     []*types.Type
-	generateInitFunc bool
+
+	targetPackage      string
+	imports            namer.ImportTracker
+	typesForInit       []*types.Type
+	generateInitFunc   bool
+	requireExplicitTag bool
+	canInlineTypeFn    CanInlineTypeFunc
+
+	context *generator.Context
 
 	globalVariables map[string]interface{}
 }
 
-func NewGenDeepCopy(sanitizedName, targetPackage string, generateInitFunc bool) generator.Generator {
+func NewGenDeepCopy(sanitizedName, targetPackage string, generateInitFunc, requireExplicitTag bool, canInlineTypeFn CanInlineTypeFunc) generator.Generator {
 	return &genDeepCopy{
 		DefaultGen: generator.DefaultGen{
 			OptionalName: sanitizedName,
 		},
-		targetPackage:    targetPackage,
-		imports:          generator.NewImportTracker(),
-		typesForInit:     make([]*types.Type, 0),
-		generateInitFunc: generateInitFunc,
+		targetPackage:      targetPackage,
+		imports:            generator.NewImportTracker(),
+		typesForInit:       make([]*types.Type, 0),
+		generateInitFunc:   generateInitFunc,
+		requireExplicitTag: requireExplicitTag,
+		canInlineTypeFn:    canInlineTypeFn,
 	}
 }
 
@@ -137,15 +200,29 @@ func (g *genDeepCopy) Namers(c *generator.Context) namer.NameSystems {
 
 func (g *genDeepCopy) Filter(c *generator.Context, t *types.Type) bool {
 	// Filter out all types not copyable within the package.
-	copyable := copyableWithinPackage(t)
+	copyable := copyableWithinPackage(t, g.requireExplicitTag)
 	if copyable {
 		g.typesForInit = append(g.typesForInit, t)
 	}
 	return copyable
 }
 
-func copyableWithinPackage(t *types.Type) bool {
-	if types.ExtractCommentTags("+", t.CommentLines)["gencopy"] == "false" {
+// publicCopyFunctionDefined returns true if a DeepCopy function has already been defined in a given
+// package, which allows more efficient deep copy implementations to be defined by the caller.
+func publicCopyFunctionDefined(c *generator.Context, t *types.Type) bool {
+	p, ok := c.Universe[t.Name.Package]
+	if !ok {
+		return false
+	}
+	return p.Functions["DeepCopy_"+path.Base(t.Name.Package)+"_"+t.Name.Name] != nil
+}
+
+func copyableWithinPackage(t *types.Type, explicitCopyRequired bool) bool {
+	tag := types.ExtractCommentTags("+", t.CommentLines)["gencopy"]
+	if tag == "false" {
+		return false
+	}
+	if explicitCopyRequired && tag != "true" {
 		return false
 	}
 	// TODO: Consider generating functions for other kinds too.
@@ -204,6 +281,7 @@ func (g *genDeepCopy) funcNameTmpl(t *types.Type) string {
 }
 
 func (g *genDeepCopy) Init(c *generator.Context, w io.Writer) error {
+	g.context = c
 	cloner := c.Universe.Type(types.Name{Package: conversionPackagePath, Name: "Cloner"})
 	g.imports.AddType(cloner)
 	g.globalVariables = map[string]interface{}{
@@ -282,7 +360,7 @@ func (g *genDeepCopy) doMap(t *types.Type, sw *generator.SnippetWriter) {
 		if t.Elem.IsAssignable() {
 			sw.Do("(*out)[key] = val\n", nil)
 		} else {
-			if copyableWithinPackage(t.Elem) {
+			if g.canInlineTypeFn(g.context, t.Elem) {
 				sw.Do("newVal := new($.|raw$)\n", t.Elem)
 				funcName := g.funcNameTmpl(t.Elem)
 				sw.Do(fmt.Sprintf("if err := %s(val, newVal, c); err != nil {\n", funcName), argsFromType(t.Elem))
@@ -313,7 +391,7 @@ func (g *genDeepCopy) doSlice(t *types.Type, sw *generator.SnippetWriter) {
 		sw.Do("for i := range in {\n", nil)
 		if t.Elem.IsAssignable() {
 			sw.Do("(*out)[i] = in[i]\n", nil)
-		} else if copyableWithinPackage(t.Elem) {
+		} else if g.canInlineTypeFn(g.context, t.Elem) {
 			funcName := g.funcNameTmpl(t.Elem)
 			sw.Do(fmt.Sprintf("if err := %s(in[i], &(*out)[i], c); err != nil {\n", funcName), argsFromType(t.Elem))
 			sw.Do("return err\n", nil)
@@ -346,7 +424,7 @@ func (g *genDeepCopy) doStruct(t *types.Type, sw *generator.SnippetWriter) {
 			sw.Do("out.$.name$ = nil\n", args)
 			sw.Do("}\n", nil)
 		case types.Struct:
-			if copyableWithinPackage(m.Type) {
+			if g.canInlineTypeFn(g.context, m.Type) {
 				funcName := g.funcNameTmpl(m.Type)
 				sw.Do(fmt.Sprintf("if err := %s(in.$.name$, &out.$.name$, c); err != nil {\n", funcName), args)
 				sw.Do("return err\n", nil)
@@ -383,7 +461,7 @@ func (g *genDeepCopy) doPointer(t *types.Type, sw *generator.SnippetWriter) {
 	sw.Do("*out = new($.Elem|raw$)\n", t)
 	if t.Elem.Kind == types.Builtin {
 		sw.Do("**out = *in", nil)
-	} else if copyableWithinPackage(t.Elem) {
+	} else if g.canInlineTypeFn(g.context, t.Elem) {
 		funcName := g.funcNameTmpl(t.Elem)
 		sw.Do(fmt.Sprintf("if err := %s(*in, *out, c); err != nil {\n", funcName), argsFromType(t.Elem))
 		sw.Do("return err\n", nil)

cmd/libs/go2idl/deepcopy-gen/main.go

@@ -31,6 +31,11 @@ import (
 func main() {
 	arguments := args.Default()
 
+	arguments.CustomArgs = generators.Constraints{
+		// Types outside of this package will be inlined.
+		PackageConstraints: []string{"k8s.io/kubernetes/"},
+	}
+
 	// Override defaults. These are Kubernetes specific input locations.
 	arguments.InputDirs = []string{
 		"k8s.io/kubernetes/pkg/api",
@@ -56,6 +61,19 @@ func main() {
 		"k8s.io/kubernetes/pkg/apis/rbac/v1alpha1",
 		"k8s.io/kubernetes/federation/apis/federation",
 		"k8s.io/kubernetes/federation/apis/federation/v1alpha1",
+
+		// generate all types, but do not register them
+		"+k8s.io/kubernetes/pkg/api/unversioned",
+
+		"-k8s.io/kubernetes/pkg/api/meta",
+		"-k8s.io/kubernetes/pkg/api/meta/metatypes",
+		"-k8s.io/kubernetes/pkg/api/resource",
+		"-k8s.io/kubernetes/pkg/conversion",
+		"-k8s.io/kubernetes/pkg/labels",
+		"-k8s.io/kubernetes/pkg/runtime",
+		"-k8s.io/kubernetes/pkg/runtime/serializer",
+		"-k8s.io/kubernetes/pkg/util/intstr",
+		"-k8s.io/kubernetes/pkg/util/sets",
 	}
 
 	if err := arguments.Execute(

pkg/api/resource/quantity.go

@@ -87,6 +87,7 @@ import (
 // writing some sort of special handling code in the hopes that that will
 // cause implementors to also use a fixed point implementation.
 //
+// +gencopy=false
 // +protobuf=true
 // +protobuf.embed=string
 // +protobuf.options.marshal=false

pkg/runtime/types.go

@@ -40,6 +40,7 @@ import (
 // TypeMeta is provided here for convenience. You may use it directly from this package or define
 // your own with the same fields.
 //
+// +gencopy=true
 // +protobuf=true
 type TypeMeta struct {
 	APIVersion string `json:"apiVersion,omitempty" yaml:"apiVersion,omitempty" protobuf:"bytes,1,opt,name=apiVersion"`
@@ -92,6 +93,7 @@ const (
 // in the Object. (TODO: In the case where the object is of an unknown type, a
 // runtime.Unknown object will be created and stored.)
 //
+// +gencopy=true
 // +protobuf=true
 type RawExtension struct {
 	// Raw is the underlying serialization of this object.
@@ -109,6 +111,7 @@ type RawExtension struct {
 // TODO: Make this object have easy access to field based accessors and settors for
 // metadata and field mutatation.
 //
+// +gencopy=true
 // +protobuf=true
 type Unknown struct {
 	TypeMeta `json:",inline" protobuf:"bytes,1,opt,name=typeMeta"`

pkg/util/intstr/intstr.go

@@ -32,6 +32,7 @@ import (
 // accept a name or number.
 // TODO: Rename to Int32OrString
 //
+// +gencopy=true
 // +protobuf=true
 // +protobuf.options.(gogoproto.goproto_stringer)=false
 type IntOrString struct {