mirror of
https://github.com/tailscale/tailscale.git
synced 2026-04-23 14:32:29 +02:00
514d7d28e7
Pull the hook logic into a reusable githook library package so tailscale/corp can share it via a thin wrapper main instead of keeping a forked copy in sync. The install flow also changes: a wrapper scripts now build the binary and reinstall the git hooks. Pulling new shared code no longer requires re-running the installer. Updates tailscale/corp#39860 Change-Id: I4d606d11c8c883015c190c54e3387a7f9fe4dd32 Signed-off-by: Fernando Serboncini <fserb@tailscale.com>
65 lines
1.6 KiB
Go
65 lines
1.6 KiB
Go
// Copyright (c) Tailscale Inc & contributors
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// SPDX-License-Identifier: BSD-3-Clause
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package githook
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import (
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"bytes"
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"crypto/rand"
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"errors"
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"fmt"
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"io"
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"os"
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"os/exec"
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)
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// AddChangeID strips comments from the commit message at args[0] and
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// prepends a random Change-Id trailer.
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//
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// Intended as a commit-msg hook.
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// https://git-scm.com/docs/githooks#_commit_msg
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func AddChangeID(args []string) error {
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if len(args) != 1 {
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return errors.New("usage: commit-msg message.txt")
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}
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file := args[0]
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msg, err := os.ReadFile(file)
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if err != nil {
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return err
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}
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msg = filterCutLine(msg)
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var id [20]byte
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if _, err := io.ReadFull(rand.Reader, id[:]); err != nil {
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return fmt.Errorf("could not generate Change-Id: %v", err)
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}
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cmdLines := [][]string{
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{"git", "stripspace", "--strip-comments"},
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{"git", "interpret-trailers", "--no-divider", "--where=start", "--if-exists", "doNothing", "--trailer", fmt.Sprintf("Change-Id: I%x", id)},
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}
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for _, cmdLine := range cmdLines {
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if len(msg) == 0 {
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// Don't let commands turn an empty message into a non-empty one (issue 2205).
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break
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}
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cmd := exec.Command(cmdLine[0], cmdLine[1:]...)
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cmd.Stdin = bytes.NewReader(msg)
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msg, err = cmd.CombinedOutput()
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if err != nil {
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return fmt.Errorf("failed to run %v: %w\n%s", cmd, err, msg)
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}
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}
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return os.WriteFile(file, msg, 0666)
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}
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var gitCutLine = []byte("# ------------------------ >8 ------------------------")
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// filterCutLine strips a `git commit -v`-style cutline and everything
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// after it from msg.
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func filterCutLine(msg []byte) []byte {
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if before, _, ok := bytes.Cut(msg, gitCutLine); ok {
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return before
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}
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return msg
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}
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