77 lines
1.8 KiB
Go
77 lines
1.8 KiB
Go
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/*
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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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/*
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This is a simple script that makes *every* environment variable available
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as a go template field of the same name
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$ echo "hello world, MYVAR={{.MYVAR}}" > test.txt
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$ MYVAR=foobar go run template.go test.txt
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> hello world, MYVAR=foobar
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If you want the base64 version of any MYVAR, simple use {{.MYVAR_BASE64}}
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*/
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package main
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import (
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"encoding/base64"
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"flag"
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"fmt"
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"io"
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"os"
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"path"
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"strings"
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"text/template"
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)
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func main() {
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flag.Parse()
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env := make(map[string]string)
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envList := os.Environ()
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for i := range envList {
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pieces := strings.SplitN(envList[i], "=", 2)
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if len(pieces) == 2 {
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env[pieces[0]] = pieces[1]
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env[pieces[0]+"_BASE64"] = base64.StdEncoding.EncodeToString([]byte(pieces[1]))
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} else {
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fmt.Fprintf(os.Stderr, "Invalid environ found: %s\n", envList[i])
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os.Exit(2)
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}
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}
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for i := 0; i < flag.NArg(); i++ {
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inpath := flag.Arg(i)
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if err := templateYamlFile(env, inpath, os.Stdout); err != nil {
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panic(err)
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}
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}
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}
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func templateYamlFile(params map[string]string, inpath string, out io.Writer) error {
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if tmpl, err := template.New(path.Base(inpath)).Option("missingkey=zero").ParseFiles(inpath); err != nil {
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return err
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} else {
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if err := tmpl.Execute(out, params); err != nil {
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return err
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}
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}
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_, err := out.Write([]byte("\n---\n"))
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return err
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}
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