86 lines
1.7 KiB
Go
86 lines
1.7 KiB
Go
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// Copyright 2014-2017 Ulrich Kunitz. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package main
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import (
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"flag"
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"fmt"
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"io"
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"log"
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"os"
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"os/exec"
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"path/filepath"
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"strings"
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"text/template"
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)
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const vfUsage = `xb version-file [options] <id>:<path>...
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The command creates go file with a version constant. The version string
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contains the contents of the VERSION environment variable or the output
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of git describe.
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-h prints this message and exits
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-p package name (default main)
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-o file name of output
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`
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func versionFileUsage(w io.Writer) {
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fmt.Fprint(w, vfUsage)
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}
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func versionFile() {
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cmdName := filepath.Base(os.Args[0])
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log.SetPrefix(fmt.Sprintf("%s: ", cmdName))
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log.SetFlags(0)
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flag.CommandLine = flag.NewFlagSet(cmdName, flag.ExitOnError)
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flag.Usage = func() { versionFileUsage(os.Stderr); os.Exit(1) }
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help := flag.Bool("h", false, "")
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pkg := flag.String("p", "main", "")
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out := flag.String("o", "", "")
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flag.Parse()
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if *help {
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versionFileUsage(os.Stdout)
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os.Exit(0)
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}
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if *pkg == "" {
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log.Fatal("option -p must not be empty")
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}
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var err error
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w := os.Stdout
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if *out != "" {
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if w, err = os.Create(*out); err != nil {
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log.Fatal(err)
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}
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}
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// get the version string
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version := os.Getenv("VERSION")
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if version == "" {
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b, err := exec.Command("git", "describe").Output()
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if err != nil {
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log.Fatalf("error %s while executing git describe", err)
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}
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version = string(b)
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}
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version = strings.TrimSpace(version)
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versionTmpl := `package main
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const version = "{{.}}"
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`
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tmpl := template.Must(template.New("version").Parse(versionTmpl))
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if err = tmpl.Execute(w, version); err != nil {
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log.Fatal(err)
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}
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}
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