mirror of https://github.com/kubernetes/kops.git
149 lines
3.8 KiB
Go
149 lines
3.8 KiB
Go
/*
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Copyright 2016 The Kubernetes Authors.
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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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package main
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import (
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"bufio"
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"bytes"
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"fmt"
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"io"
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"io/ioutil"
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"text/template"
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yaml "gopkg.in/yaml.v2"
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"github.com/spf13/cobra"
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"k8s.io/kops/cmd/kops/util"
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"k8s.io/kops/upup/pkg/fi/utils"
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"k8s.io/kubernetes/pkg/kubectl/cmd/templates"
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"k8s.io/kubernetes/pkg/util/i18n"
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)
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var (
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toolbox_templating_long = templates.LongDesc(i18n.T(`
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Generate cluster.yaml from values input yaml file and apply template.
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`))
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toolbox_templating_example = templates.Examples(i18n.T(`
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# generate cluster.yaml from template and input values
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kops toolbox template \
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--values values.yaml \
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--template cluster.tmpl.yaml \
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--output cluster.yaml
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`))
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toolbox_templating_short = i18n.T(`Generate cluster.yaml from template`)
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)
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type ToolboxTemplateOption struct {
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ClusterName string
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ValuesFile string
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TemplateFile string
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OutPutFile string
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}
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func NewCmdToolboxTemplate(f *util.Factory, out io.Writer) *cobra.Command {
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options := &ToolboxTemplateOption{}
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cmd := &cobra.Command{
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Use: "template",
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Short: toolbox_templating_short,
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Long: toolbox_templating_long,
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Example: toolbox_templating_example,
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Run: func(cmd *cobra.Command, args []string) {
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err := rootCommand.ProcessArgs(args)
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if err != nil {
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exitWithError(err)
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}
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options.ClusterName = rootCommand.ClusterName()
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err = RunToolBoxTemplate(f, out, options)
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if err != nil {
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exitWithError(err)
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}
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},
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}
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cmd.Flags().StringVar(&options.ValuesFile, "values", options.ValuesFile, "Path to values yaml file, default: values.yaml")
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cmd.Flags().StringVar(&options.TemplateFile, "template", options.TemplateFile, "Path to template file, default: cluster.tmpl.yaml")
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cmd.Flags().StringVar(&options.OutPutFile, "output", options.OutPutFile, "Path to output file, default: cluster.yaml")
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return cmd
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}
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func RunToolBoxTemplate(f *util.Factory, out io.Writer, options *ToolboxTemplateOption) error {
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if options.ValuesFile == "" {
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options.ValuesFile = "values.yaml"
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}
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if options.TemplateFile == "" {
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options.TemplateFile = "cluster.tmpl.yaml"
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}
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if options.OutPutFile == "" {
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options.OutPutFile = "cluster.yaml"
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}
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options.ValuesFile = utils.ExpandPath(options.ValuesFile)
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options.TemplateFile = utils.ExpandPath(options.TemplateFile)
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options.OutPutFile = utils.ExpandPath(options.OutPutFile)
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err := ExecTemplate(options, out)
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if err != nil {
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exitWithError(err)
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}
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return nil
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}
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func ExecTemplate(options *ToolboxTemplateOption, out io.Writer) error {
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valuesByteArr, err := ioutil.ReadFile(options.ValuesFile)
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if err != nil {
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return fmt.Errorf("failed to read values file: %v :%v", options.ValuesFile, err)
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}
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tmpl, err := template.ParseFiles(options.TemplateFile)
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if err != nil {
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return fmt.Errorf("failed to read template file: %v :%v", options.TemplateFile, err)
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}
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var values map[string]interface{}
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err = yaml.Unmarshal(valuesByteArr, &values)
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if err != nil {
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return fmt.Errorf("failed to unmarshal valuesfile: %v :%v", options.ValuesFile, err)
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}
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var buff bytes.Buffer
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writer := bufio.NewWriter(&buff)
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err = tmpl.Execute(writer, values)
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if err != nil {
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return fmt.Errorf("failed to execute template: %v", err)
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}
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err = writer.Flush()
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if err != nil {
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exitWithError(err)
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}
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err = ioutil.WriteFile(options.OutPutFile, buff.Bytes(), 0644)
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if err != nil {
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exitWithError(err)
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}
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return nil
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}
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