Merge pull request #8320 from wojtek-t/generated_deep_copy

Code to automatically generate functions for DeepCopy

cmd/gendeepcopy/deep_copy.go

@@ -0,0 +1,82 @@
+/*
+Copyright 2015 The Kubernetes Authors All rights reserved.
+
+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 (
+	"io"
+	"os"
+	"runtime"
+	"strings"
+
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/api"
+	_ "github.com/GoogleCloudPlatform/kubernetes/pkg/api/v1"
+	_ "github.com/GoogleCloudPlatform/kubernetes/pkg/api/v1beta1"
+	_ "github.com/GoogleCloudPlatform/kubernetes/pkg/api/v1beta2"
+	_ "github.com/GoogleCloudPlatform/kubernetes/pkg/api/v1beta3"
+	pkg_runtime "github.com/GoogleCloudPlatform/kubernetes/pkg/runtime"
+
+	"github.com/golang/glog"
+	flag "github.com/spf13/pflag"
+)
+
+var (
+	functionDest = flag.StringP("func-dest", "f", "-", "Output for deep copy functions; '-' means stdout")
+	version      = flag.StringP("version", "v", "v1beta3", "Version for deep copies.")
+	overwrites   = flag.StringP("overwrites", "o", "", "Comma-separated overwrites for package names")
+)
+
+func main() {
+	runtime.GOMAXPROCS(runtime.NumCPU())
+	flag.Parse()
+
+	var funcOut io.Writer
+	if *functionDest == "-" {
+		funcOut = os.Stdout
+	} else {
+		file, err := os.Create(*functionDest)
+		if err != nil {
+			glog.Fatalf("Couldn't open %v: %v", *functionDest, err)
+		}
+		defer file.Close()
+		funcOut = file
+	}
+
+	knownVersion := *version
+	if knownVersion == "api" {
+		knownVersion = api.Scheme.Raw().InternalVersion
+	}
+	generator := pkg_runtime.NewDeepCopyGenerator(api.Scheme.Raw())
+
+	for _, overwrite := range strings.Split(*overwrites, ",") {
+		vals := strings.Split(overwrite, "=")
+		generator.OverwritePackage(vals[0], vals[1])
+	}
+	for _, knownType := range api.Scheme.KnownTypes(knownVersion) {
+		if err := generator.AddType(knownType); err != nil {
+			glog.Errorf("error while generating deep copy functions for %v: %v", knownType, err)
+		}
+	}
+	if err := generator.WriteImports(funcOut, *version); err != nil {
+		glog.Fatalf("error while writing imports: %v", err)
+	}
+	if err := generator.WriteDeepCopyFunctions(funcOut); err != nil {
+		glog.Fatalf("error while writing deep copy functions: %v", err)
+	}
+	if err := generator.RegisterDeepCopyFunctions(funcOut, *version); err != nil {
+		glog.Fatalf("error while registering deep copy functions: %v", err)
+	}
+}