blob: 31dff11b580da01d45d677d44b26b868ba59b212 [file] [log] [blame]
// Copyright 2014 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package main
import (
"bytes"
"crypto/rand"
"fmt"
"io"
"io/ioutil"
"os"
"path/filepath"
"regexp"
"runtime"
"strings"
)
var hookPath = ".git/hooks/"
var hookFiles = []string{
"commit-msg",
"pre-commit",
}
func installHook() {
for _, hookFile := range hookFiles {
filename := filepath.Join(repoRoot(), hookPath+hookFile)
hookContent := fmt.Sprintf(hookScript, hookFile)
if data, err := ioutil.ReadFile(filename); err == nil {
// Special case: remove old hooks that use 'git-review'
oldHookContent := fmt.Sprintf(oldHookScript, hookFile)
if string(data) == oldHookContent {
verbosef("removing old %v hook", hookFile)
os.Remove(filename)
}
// Special case: remove old commit-msg shell script
// in favor of invoking the git-codereview hook
// implementation, which will be easier to change in
// the future.
if hookFile == "commit-msg" && string(data) == oldCommitMsgHook {
verbosef("removing old commit-msg hook")
os.Remove(filename)
}
}
// If hook file exists, assume it is okay.
_, err := os.Stat(filename)
if err == nil {
if *verbose > 0 {
data, err := ioutil.ReadFile(filename)
if err != nil {
verbosef("reading hook: %v", err)
} else if string(data) != hookContent {
verbosef("unexpected hook content in %s", filename)
}
}
continue
}
if !os.IsNotExist(err) {
dief("checking hook: %v", err)
}
verbosef("installing %s hook", hookFile)
if err := ioutil.WriteFile(filename, []byte(hookContent), 0700); err != nil {
dief("writing hook: %v", err)
}
}
}
func repoRoot() string {
dir, err := os.Getwd()
if err != nil {
dief("could not get current directory: %v", err)
}
rootlen := 1
if runtime.GOOS == "windows" {
rootlen += len(filepath.VolumeName(dir))
}
for {
if _, err := os.Stat(filepath.Join(dir, ".git")); err == nil {
return dir
}
if len(dir) == rootlen && dir[rootlen-1] == filepath.Separator {
dief("git root not found. Rerun from within the Git tree.")
}
dir = filepath.Dir(dir)
}
}
var hookScript = `#!/bin/sh
exec git-codereview hook-invoke %s "$@"
`
var oldHookScript = `#!/bin/sh
exec git-review hook-invoke %s "$@"
`
func hookInvoke(args []string) {
if len(args) == 0 {
dief("usage: git-codereview hook-invoke <hook-name> [args...]")
}
switch args[0] {
case "commit-msg":
hookCommitMsg(args[1:])
case "pre-commit":
hookPreCommit(args[1:])
}
}
// hookCommitMsg is installed as the git commit-msg hook.
// It adds a Change-Id line to the bottom of the commit message
// if there is not one already.
func hookCommitMsg(args []string) {
if len(args) != 1 {
dief("usage: git-codereview hook-invoke commit-msg message.txt\n")
}
b := CurrentBranch()
if b.DetachedHead() {
// Likely executing rebase or some other internal operation.
// Probably a mistake to make commit message changes.
return
}
file := args[0]
data, err := ioutil.ReadFile(file)
if err != nil {
dief("%v", err)
}
data = stripComments(data)
// Empty message not allowed.
if len(bytes.TrimSpace(data)) == 0 {
dief("empty commit message")
}
// Add Change-Id to commit message if not present.
edited := false
if !bytes.Contains(data, []byte("\nChange-Id: ")) {
edited = true
n := len(data)
for n > 0 && data[n-1] == '\n' {
n--
}
var id [20]byte
if _, err := io.ReadFull(rand.Reader, id[:]); err != nil {
dief("generating Change-Id: %v", err)
}
data = append(data[:n], fmt.Sprintf("\n\nChange-Id: I%x\n", id[:])...)
}
// Add branch prefix to commit message if not present and not on master.
branch := strings.TrimPrefix(b.OriginBranch(), "origin/")
if branch != "master" {
prefix := "[" + branch + "] "
if !bytes.HasPrefix(data, []byte(prefix)) {
edited = true
data = []byte(prefix + string(data))
}
}
// Write back.
if edited {
if err := ioutil.WriteFile(file, data, 0666); err != nil {
dief("%v", err)
}
}
}
// stripComments strips lines that begin with "#".
func stripComments(in []byte) []byte {
return regexp.MustCompile(`(?m)^#.*\n`).ReplaceAll(in, nil)
}
// hookPreCommit is installed as the git pre-commit hook.
// It prevents commits to the master branch.
// It checks that the Go files added, copied, or modified by
// the change are gofmt'd, and if not it prints gofmt instructions
// and exits with nonzero status.
func hookPreCommit(args []string) {
// Prevent commits to master branches.
b := CurrentBranch()
if b.DetachedHead() {
// This is an internal commit such as during git rebase.
// Don't die, and don't force gofmt.
return
}
if !b.IsLocalOnly() {
dief("cannot commit on %s branch", b.Name)
}
hookGofmt()
}
func hookGofmt() {
files, stderr := runGofmt(gofmtPreCommit)
if stderr != "" {
msgf := printf
if len(files) == 0 {
msgf = dief
}
msgf("gofmt reported errors:\n\t%s", strings.Replace(strings.TrimSpace(stderr), "\n", "\n\t", -1))
}
if len(files) == 0 {
return
}
dief("gofmt needs to format these files (run 'git gofmt'):\n\t%s",
strings.Join(files, "\n\t"))
}
// This is NOT USED ANYMORE.
// It is here only for comparing against old commit-hook files.
var oldCommitMsgHook = `#!/bin/sh
# From Gerrit Code Review 2.2.1
#
# Part of Gerrit Code Review (http://code.google.com/p/gerrit/)
#
# Copyright (C) 2009 The Android Open Source Project
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
CHANGE_ID_AFTER="Bug|Issue"
MSG="$1"
# Check for, and add if missing, a unique Change-Id
#
add_ChangeId() {
clean_message=` + "`" + `sed -e '
/^diff --git a\/.*/{
s///
q
}
/^Signed-off-by:/d
/^#/d
' "$MSG" | git stripspace` + "`" + `
if test -z "$clean_message"
then
return
fi
if grep -i '^Change-Id:' "$MSG" >/dev/null
then
return
fi
id=` + "`" + `_gen_ChangeId` + "`" + `
perl -e '
$MSG = shift;
$id = shift;
$CHANGE_ID_AFTER = shift;
undef $/;
open(I, $MSG); $_ = <I>; close I;
s|^diff --git a/.*||ms;
s|^#.*$||mg;
exit unless $_;
@message = split /\n/;
$haveFooter = 0;
$startFooter = @message;
for($line = @message - 1; $line >= 0; $line--) {
$_ = $message[$line];
if (/^[a-zA-Z0-9-]+:/ && !m,^[a-z0-9-]+://,) {
$haveFooter++;
next;
}
next if /^[ []/;
$startFooter = $line if ($haveFooter && /^\r?$/);
last;
}
@footer = @message[$startFooter+1..@message];
@message = @message[0..$startFooter];
push(@footer, "") unless @footer;
for ($line = 0; $line < @footer; $line++) {
$_ = $footer[$line];
next if /^($CHANGE_ID_AFTER):/i;
last;
}
splice(@footer, $line, 0, "Change-Id: I$id");
$_ = join("\n", @message, @footer);
open(O, ">$MSG"); print O; close O;
' "$MSG" "$id" "$CHANGE_ID_AFTER"
}
_gen_ChangeIdInput() {
echo "tree ` + "`" + `git write-tree` + "`" + `"
if parent=` + "`" + `git rev-parse HEAD^0 2>/dev/null` + "`" + `
then
echo "parent $parent"
fi
echo "author ` + "`" + `git var GIT_AUTHOR_IDENT` + "`" + `"
echo "committer ` + "`" + `git var GIT_COMMITTER_IDENT` + "`" + `"
echo
printf '%s' "$clean_message"
}
_gen_ChangeId() {
_gen_ChangeIdInput |
git hash-object -t commit --stdin
}
add_ChangeId
`