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package log
import (
"bufio"
"bytes"
"context"
"io/ioutil"
"strconv"
"strings"
"github.com/golang/protobuf/ptypes/timestamp"
"gitlab.com/gitlab-org/gitaly-proto/go/gitalypb"
"gitlab.com/gitlab-org/gitaly/internal/git"
"gitlab.com/gitlab-org/gitaly/internal/git/catfile"
"gitlab.com/gitlab-org/gitaly/internal/helper"
)
// GetCommit tries to resolve revision to a Git commit. Returns nil if
// no object is found at revision.
func GetCommit(ctx context.Context, repo *gitalypb.Repository, revision string) (*gitalypb.GitCommit, error) {
c, err := catfile.New(ctx, repo)
if err != nil {
return nil, err
}
return GetCommitCatfile(c, revision)
}
// GetCommitCatfile looks up a commit by revision using an existing *catfile.Batch instance.
func GetCommitCatfile(c *catfile.Batch, revision string) (*gitalypb.GitCommit, error) {
info, err := c.Info(revision + "^{commit}")
if err != nil {
if catfile.IsNotFound(err) {
return nil, nil
}
return nil, err
}
r, err := c.Commit(info.Oid)
if err != nil {
return nil, err
}
raw, err := ioutil.ReadAll(r)
if err != nil {
return nil, err
}
return parseRawCommit(raw, info)
}
func parseRawCommit(raw []byte, info *catfile.ObjectInfo) (*gitalypb.GitCommit, error) {
split := bytes.SplitN(raw, []byte("\n\n"), 2)
header := split[0]
var body []byte
if len(split) == 2 {
body = split[1]
}
commit := &gitalypb.GitCommit{
Id: info.Oid,
Body: body,
Subject: subjectFromBody(body),
BodySize: int64(len(body)),
}
if max := helper.MaxCommitOrTagMessageSize; len(commit.Body) > max {
commit.Body = commit.Body[:max]
}
scanner := bufio.NewScanner(bytes.NewReader(header))
for scanner.Scan() {
line := scanner.Text()
if len(line) == 0 || line[0] == ' ' {
continue
}
headerSplit := strings.SplitN(line, " ", 2)
if len(headerSplit) != 2 {
continue
}
switch headerSplit[0] {
case "parent":
commit.ParentIds = append(commit.ParentIds, headerSplit[1])
case "author":
commit.Author = parseCommitAuthor(headerSplit[1])
case "committer":
commit.Committer = parseCommitAuthor(headerSplit[1])
}
}
if err := scanner.Err(); err != nil {
return nil, err
}
return commit, nil
}
const maxUnixCommitDate = 1 << 53
func parseCommitAuthor(line string) *gitalypb.CommitAuthor {
author := &gitalypb.CommitAuthor{}
splitName := strings.SplitN(line, "<", 2)
author.Name = []byte(strings.TrimSuffix(splitName[0], " "))
if len(splitName) < 2 {
return author
}
line = splitName[1]
splitEmail := strings.SplitN(line, ">", 2)
if len(splitEmail) < 2 {
return author
}
author.Email = []byte(splitEmail[0])
secSplit := strings.Fields(splitEmail[1])
if len(secSplit) < 1 {
return author
}
sec, err := strconv.ParseInt(secSplit[0], 10, 64)
if err != nil || sec > maxUnixCommitDate || sec < 0 {
sec = git.FallbackTimeValue.Unix()
}
author.Date = ×tamp.Timestamp{Seconds: sec}
return author
}
func subjectFromBody(body []byte) []byte {
return bytes.TrimRight(bytes.SplitN(body, []byte("\n"), 2)[0], "\r\n")
}
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