77 lines
1.6 KiB
Go
77 lines
1.6 KiB
Go
// Copyright (c) Tailscale Inc & AUTHORS
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// SPDX-License-Identifier: BSD-3-Clause
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// Program addlicense adds a license header to a file.
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// It is intended for use with 'go generate',
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// so it has a slightly weird usage.
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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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"os"
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"os/exec"
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)
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var (
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year = flag.Int("year", 0, "copyright year")
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file = flag.String("file", "", "file to modify")
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)
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func usage() {
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fmt.Fprintf(os.Stderr, `
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usage: addlicense -year YEAR -file FILE <subcommand args...>
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`[1:])
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flag.PrintDefaults()
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fmt.Fprintf(os.Stderr, `
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addlicense adds a Tailscale license to the beginning of file,
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using year as the copyright year.
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It is intended for use with 'go generate', so it also runs a subcommand,
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which presumably creates the file.
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Sample usage:
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addlicense -year 2021 -file pull_strings.go stringer -type=pull
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`[1:])
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os.Exit(2)
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}
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func main() {
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flag.Usage = usage
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flag.Parse()
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if len(flag.Args()) == 0 {
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flag.Usage()
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}
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cmd := exec.Command(flag.Arg(0), flag.Args()[1:]...)
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cmd.Stdout = os.Stdout
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cmd.Stderr = os.Stderr
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err := cmd.Run()
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check(err)
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b, err := os.ReadFile(*file)
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check(err)
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f, err := os.OpenFile(*file, os.O_TRUNC|os.O_WRONLY, 0644)
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check(err)
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_, err = fmt.Fprintf(f, license, *year)
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check(err)
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_, err = f.Write(b)
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check(err)
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err = f.Close()
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check(err)
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}
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func check(err error) {
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if err != nil {
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fmt.Fprintln(os.Stderr, err)
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os.Exit(1)
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}
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}
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var license = `
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// Copyright (c) %d Tailscale Inc & AUTHORS 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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`[1:]
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