mirror of
https://github.com/optim-enterprises-bv/kubernetes.git
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130 lines
3.2 KiB
Go
130 lines
3.2 KiB
Go
/*
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Copyright 2014 The Kubernetes Authors All rights reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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// kube-version-change is a simple utility for converting a
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// kubernetes object into a different api version.
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package main
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import (
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"bytes"
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"encoding/json"
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"io"
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"io/ioutil"
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"log"
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"os"
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"runtime"
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"github.com/GoogleCloudPlatform/kubernetes/pkg/api"
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"github.com/GoogleCloudPlatform/kubernetes/pkg/api/latest"
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"github.com/GoogleCloudPlatform/kubernetes/pkg/util"
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"github.com/ghodss/yaml"
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flag "github.com/spf13/pflag"
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)
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var (
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inputSource = flag.StringP("input", "i", "-", "Input source; '-' means stdin")
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outputDest = flag.StringP("output", "o", "-", "Output destination; '-' means stdout")
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rewrite = flag.StringP("rewrite", "r", "", "If nonempty, use this as both input and output.")
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outputVersion = flag.StringP("out-version", "v", latest.Version, "Version to convert input to")
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)
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// isYAML determines whether data is JSON or YAML formatted by seeing
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// if it will parse as json.
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func isYAML(data []byte) bool {
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var unused interface{}
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if err := json.Unmarshal(data, &unused); err != nil {
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return true
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}
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return false
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}
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func main() {
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runtime.GOMAXPROCS(runtime.NumCPU())
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flag.CommandLine.SetNormalizeFunc(util.WordSepNormalizeFunc)
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flag.Parse()
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if *rewrite != "" {
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*inputSource = *rewrite
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*outputDest = *rewrite
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}
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var in io.Reader
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if *inputSource == "-" {
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in = os.Stdin
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} else {
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f, err := os.Open(*inputSource)
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if err != nil {
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log.Fatalf("Couldn't open %q: %q", *inputSource, err)
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}
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defer f.Close()
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in = f
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}
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data, err := ioutil.ReadAll(in)
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if err != nil {
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log.Fatalf("Couldn't read from input: %q", err)
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}
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isYAML := isYAML(data)
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if isYAML {
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data, err = yaml.YAMLToJSON(data)
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if err != nil {
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log.Fatalf("Failed to convert YAML to JSON: %q", err)
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}
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}
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obj, err := api.Scheme.Decode(data)
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if err != nil {
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log.Fatalf("Couldn't decode input: %q", err)
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}
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outData, err := api.Scheme.EncodeToVersion(obj, *outputVersion)
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if err != nil {
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log.Fatalf("Failed to encode to version %q: %q", *outputVersion, err)
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}
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if isYAML {
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outData, err = yaml.JSONToYAML(outData)
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if err != nil {
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log.Fatalf("Failed to convert to YAML: %q", err)
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}
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} else if true {
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// TODO: figure out if input JSON was pretty.
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var buf bytes.Buffer
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err = json.Indent(&buf, outData, "", " ")
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if err != nil {
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log.Fatalf("Failed to indent JSON: %q", err)
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}
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outData = buf.Bytes()
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}
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var out io.Writer
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if *outputDest == "-" {
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out = os.Stdout
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} else {
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f, err := os.Create(*outputDest)
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if err != nil {
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log.Fatalf("Couldn't open %q: %q", *outputDest, err)
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}
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defer f.Close()
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out = f
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}
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if _, err = out.Write(outData); err != nil {
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log.Fatalf("Failed to write: %q", err)
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}
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}
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