mirror of
https://github.com/go-gitea/gitea.git
synced 2024-10-31 08:37:35 -04:00
a2cfcdb91a
The LastCommitCache code is a little complex and there is unnecessary duplication between the gogit and nogogit variants. This PR adds the LastCommitCache as a field to the git.Repository and pre-creates it in the ReferencesGit helpers etc. There has been some simplification and unification of the variant code. Signed-off-by: Andrew Thornton <art27@cantab.net>
431 lines
10 KiB
Go
431 lines
10 KiB
Go
// Copyright 2021 The Gitea Authors. All rights reserved.
|
|
// Use of this source code is governed by a MIT-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
package git
|
|
|
|
import (
|
|
"bufio"
|
|
"bytes"
|
|
"context"
|
|
"errors"
|
|
"io"
|
|
"path"
|
|
"sort"
|
|
"strings"
|
|
|
|
"github.com/djherbis/buffer"
|
|
"github.com/djherbis/nio/v3"
|
|
)
|
|
|
|
// LogNameStatusRepo opens git log --raw in the provided repo and returns a stdin pipe, a stdout reader and cancel function
|
|
func LogNameStatusRepo(ctx context.Context, repository, head, treepath string, paths ...string) (*bufio.Reader, func()) {
|
|
// We often want to feed the commits in order into cat-file --batch, followed by their trees and sub trees as necessary.
|
|
// so let's create a batch stdin and stdout
|
|
stdoutReader, stdoutWriter := nio.Pipe(buffer.New(32 * 1024))
|
|
|
|
// Lets also create a context so that we can absolutely ensure that the command should die when we're done
|
|
ctx, ctxCancel := context.WithCancel(ctx)
|
|
|
|
cancel := func() {
|
|
ctxCancel()
|
|
_ = stdoutReader.Close()
|
|
_ = stdoutWriter.Close()
|
|
}
|
|
|
|
args := make([]string, 0, 8+len(paths))
|
|
args = append(args, "log", "--name-status", "-c", "--format=commit%x00%H %P%x00", "--parents", "--no-renames", "-t", "-z", head, "--")
|
|
if len(paths) < 70 {
|
|
if treepath != "" {
|
|
args = append(args, treepath)
|
|
for _, pth := range paths {
|
|
if pth != "" {
|
|
args = append(args, path.Join(treepath, pth))
|
|
}
|
|
}
|
|
} else {
|
|
for _, pth := range paths {
|
|
if pth != "" {
|
|
args = append(args, pth)
|
|
}
|
|
}
|
|
}
|
|
} else if treepath != "" {
|
|
args = append(args, treepath)
|
|
}
|
|
|
|
go func() {
|
|
stderr := strings.Builder{}
|
|
err := NewCommand(ctx, args...).Run(&RunOpts{
|
|
Dir: repository,
|
|
Stdout: stdoutWriter,
|
|
Stderr: &stderr,
|
|
})
|
|
if err != nil {
|
|
_ = stdoutWriter.CloseWithError(ConcatenateError(err, (&stderr).String()))
|
|
return
|
|
}
|
|
|
|
_ = stdoutWriter.Close()
|
|
}()
|
|
|
|
// For simplicities sake we'll us a buffered reader to read from the cat-file --batch
|
|
bufReader := bufio.NewReaderSize(stdoutReader, 32*1024)
|
|
|
|
return bufReader, cancel
|
|
}
|
|
|
|
// LogNameStatusRepoParser parses a git log raw output from LogRawRepo
|
|
type LogNameStatusRepoParser struct {
|
|
treepath string
|
|
paths []string
|
|
next []byte
|
|
buffull bool
|
|
rd *bufio.Reader
|
|
cancel func()
|
|
}
|
|
|
|
// NewLogNameStatusRepoParser returns a new parser for a git log raw output
|
|
func NewLogNameStatusRepoParser(ctx context.Context, repository, head, treepath string, paths ...string) *LogNameStatusRepoParser {
|
|
rd, cancel := LogNameStatusRepo(ctx, repository, head, treepath, paths...)
|
|
return &LogNameStatusRepoParser{
|
|
treepath: treepath,
|
|
paths: paths,
|
|
rd: rd,
|
|
cancel: cancel,
|
|
}
|
|
}
|
|
|
|
// LogNameStatusCommitData represents a commit artefact from git log raw
|
|
type LogNameStatusCommitData struct {
|
|
CommitID string
|
|
ParentIDs []string
|
|
Paths []bool
|
|
}
|
|
|
|
// Next returns the next LogStatusCommitData
|
|
func (g *LogNameStatusRepoParser) Next(treepath string, paths2ids map[string]int, changed []bool, maxpathlen int) (*LogNameStatusCommitData, error) {
|
|
var err error
|
|
if g.next == nil || len(g.next) == 0 {
|
|
g.buffull = false
|
|
g.next, err = g.rd.ReadSlice('\x00')
|
|
if err != nil {
|
|
if err == bufio.ErrBufferFull {
|
|
g.buffull = true
|
|
} else if err == io.EOF {
|
|
return nil, nil
|
|
} else {
|
|
return nil, err
|
|
}
|
|
}
|
|
}
|
|
|
|
ret := LogNameStatusCommitData{}
|
|
if bytes.Equal(g.next, []byte("commit\000")) {
|
|
g.next, err = g.rd.ReadSlice('\x00')
|
|
if err != nil {
|
|
if err == bufio.ErrBufferFull {
|
|
g.buffull = true
|
|
} else if err == io.EOF {
|
|
return nil, nil
|
|
} else {
|
|
return nil, err
|
|
}
|
|
}
|
|
}
|
|
|
|
// Our "line" must look like: <commitid> SP (<parent> SP) * NUL
|
|
ret.CommitID = string(g.next[0:40])
|
|
parents := string(g.next[41:])
|
|
if g.buffull {
|
|
more, err := g.rd.ReadString('\x00')
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
parents += more
|
|
}
|
|
parents = parents[:len(parents)-1]
|
|
ret.ParentIDs = strings.Split(parents, " ")
|
|
|
|
// now read the next "line"
|
|
g.buffull = false
|
|
g.next, err = g.rd.ReadSlice('\x00')
|
|
if err != nil {
|
|
if err == bufio.ErrBufferFull {
|
|
g.buffull = true
|
|
} else if err != io.EOF {
|
|
return nil, err
|
|
}
|
|
}
|
|
|
|
if err == io.EOF || !(g.next[0] == '\n' || g.next[0] == '\000') {
|
|
return &ret, nil
|
|
}
|
|
|
|
// Ok we have some changes.
|
|
// This line will look like: NL <fname> NUL
|
|
//
|
|
// Subsequent lines will not have the NL - so drop it here - g.bufffull must also be false at this point too.
|
|
if g.next[0] == '\n' {
|
|
g.next = g.next[1:]
|
|
} else {
|
|
g.buffull = false
|
|
g.next, err = g.rd.ReadSlice('\x00')
|
|
if err != nil {
|
|
if err == bufio.ErrBufferFull {
|
|
g.buffull = true
|
|
} else if err != io.EOF {
|
|
return nil, err
|
|
}
|
|
}
|
|
if len(g.next) == 0 {
|
|
return &ret, nil
|
|
}
|
|
if g.next[0] == '\x00' {
|
|
g.buffull = false
|
|
g.next, err = g.rd.ReadSlice('\x00')
|
|
if err != nil {
|
|
if err == bufio.ErrBufferFull {
|
|
g.buffull = true
|
|
} else if err != io.EOF {
|
|
return nil, err
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
fnameBuf := make([]byte, 4096)
|
|
|
|
diffloop:
|
|
for {
|
|
if err == io.EOF || bytes.Equal(g.next, []byte("commit\000")) {
|
|
return &ret, nil
|
|
}
|
|
g.next, err = g.rd.ReadSlice('\x00')
|
|
if err != nil {
|
|
if err == bufio.ErrBufferFull {
|
|
g.buffull = true
|
|
} else if err == io.EOF {
|
|
return &ret, nil
|
|
} else {
|
|
return nil, err
|
|
}
|
|
}
|
|
copy(fnameBuf, g.next)
|
|
if len(fnameBuf) < len(g.next) {
|
|
fnameBuf = append(fnameBuf, g.next[len(fnameBuf):]...)
|
|
} else {
|
|
fnameBuf = fnameBuf[:len(g.next)]
|
|
}
|
|
if err != nil {
|
|
if err != bufio.ErrBufferFull {
|
|
return nil, err
|
|
}
|
|
more, err := g.rd.ReadBytes('\x00')
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
fnameBuf = append(fnameBuf, more...)
|
|
}
|
|
|
|
// read the next line
|
|
g.buffull = false
|
|
g.next, err = g.rd.ReadSlice('\x00')
|
|
if err != nil {
|
|
if err == bufio.ErrBufferFull {
|
|
g.buffull = true
|
|
} else if err != io.EOF {
|
|
return nil, err
|
|
}
|
|
}
|
|
|
|
if treepath != "" {
|
|
if !bytes.HasPrefix(fnameBuf, []byte(treepath)) {
|
|
fnameBuf = fnameBuf[:cap(fnameBuf)]
|
|
continue diffloop
|
|
}
|
|
}
|
|
fnameBuf = fnameBuf[len(treepath) : len(fnameBuf)-1]
|
|
if len(fnameBuf) > maxpathlen {
|
|
fnameBuf = fnameBuf[:cap(fnameBuf)]
|
|
continue diffloop
|
|
}
|
|
if len(fnameBuf) > 0 {
|
|
if len(treepath) > 0 {
|
|
if fnameBuf[0] != '/' || bytes.IndexByte(fnameBuf[1:], '/') >= 0 {
|
|
fnameBuf = fnameBuf[:cap(fnameBuf)]
|
|
continue diffloop
|
|
}
|
|
fnameBuf = fnameBuf[1:]
|
|
} else if bytes.IndexByte(fnameBuf, '/') >= 0 {
|
|
fnameBuf = fnameBuf[:cap(fnameBuf)]
|
|
continue diffloop
|
|
}
|
|
}
|
|
|
|
idx, ok := paths2ids[string(fnameBuf)]
|
|
if !ok {
|
|
fnameBuf = fnameBuf[:cap(fnameBuf)]
|
|
continue diffloop
|
|
}
|
|
if ret.Paths == nil {
|
|
ret.Paths = changed
|
|
}
|
|
changed[idx] = true
|
|
}
|
|
}
|
|
|
|
// Close closes the parser
|
|
func (g *LogNameStatusRepoParser) Close() {
|
|
g.cancel()
|
|
}
|
|
|
|
// WalkGitLog walks the git log --name-status for the head commit in the provided treepath and files
|
|
func WalkGitLog(ctx context.Context, repo *Repository, head *Commit, treepath string, paths ...string) (map[string]string, error) {
|
|
headRef := head.ID.String()
|
|
|
|
tree, err := head.SubTree(treepath)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
entries, err := tree.ListEntries()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
if len(paths) == 0 {
|
|
paths = make([]string, 0, len(entries)+1)
|
|
paths = append(paths, "")
|
|
for _, entry := range entries {
|
|
paths = append(paths, entry.Name())
|
|
}
|
|
} else {
|
|
sort.Strings(paths)
|
|
if paths[0] != "" {
|
|
paths = append([]string{""}, paths...)
|
|
}
|
|
// remove duplicates
|
|
for i := len(paths) - 1; i > 0; i-- {
|
|
if paths[i] == paths[i-1] {
|
|
paths = append(paths[:i-1], paths[i:]...)
|
|
}
|
|
}
|
|
}
|
|
|
|
path2idx := map[string]int{}
|
|
maxpathlen := len(treepath)
|
|
|
|
for i := range paths {
|
|
path2idx[paths[i]] = i
|
|
pthlen := len(paths[i]) + len(treepath) + 1
|
|
if pthlen > maxpathlen {
|
|
maxpathlen = pthlen
|
|
}
|
|
}
|
|
|
|
g := NewLogNameStatusRepoParser(ctx, repo.Path, head.ID.String(), treepath, paths...)
|
|
// don't use defer g.Close() here as g may change its value - instead wrap in a func
|
|
defer func() {
|
|
g.Close()
|
|
}()
|
|
|
|
results := make([]string, len(paths))
|
|
remaining := len(paths)
|
|
nextRestart := (len(paths) * 3) / 4
|
|
if nextRestart > 70 {
|
|
nextRestart = 70
|
|
}
|
|
lastEmptyParent := head.ID.String()
|
|
commitSinceLastEmptyParent := uint64(0)
|
|
commitSinceNextRestart := uint64(0)
|
|
parentRemaining := map[string]bool{}
|
|
|
|
changed := make([]bool, len(paths))
|
|
|
|
heaploop:
|
|
for {
|
|
select {
|
|
case <-ctx.Done():
|
|
if ctx.Err() == context.DeadlineExceeded {
|
|
break heaploop
|
|
}
|
|
g.Close()
|
|
return nil, ctx.Err()
|
|
default:
|
|
}
|
|
current, err := g.Next(treepath, path2idx, changed, maxpathlen)
|
|
if err != nil {
|
|
if errors.Is(err, context.DeadlineExceeded) {
|
|
break heaploop
|
|
}
|
|
g.Close()
|
|
return nil, err
|
|
}
|
|
if current == nil {
|
|
break heaploop
|
|
}
|
|
delete(parentRemaining, current.CommitID)
|
|
if current.Paths != nil {
|
|
for i, found := range current.Paths {
|
|
if !found {
|
|
continue
|
|
}
|
|
changed[i] = false
|
|
if results[i] == "" {
|
|
results[i] = current.CommitID
|
|
if err := repo.LastCommitCache.Put(headRef, path.Join(treepath, paths[i]), current.CommitID); err != nil {
|
|
return nil, err
|
|
}
|
|
delete(path2idx, paths[i])
|
|
remaining--
|
|
if results[0] == "" {
|
|
results[0] = current.CommitID
|
|
if err := repo.LastCommitCache.Put(headRef, treepath, current.CommitID); err != nil {
|
|
return nil, err
|
|
}
|
|
delete(path2idx, "")
|
|
remaining--
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if remaining <= 0 {
|
|
break heaploop
|
|
}
|
|
commitSinceLastEmptyParent++
|
|
if len(parentRemaining) == 0 {
|
|
lastEmptyParent = current.CommitID
|
|
commitSinceLastEmptyParent = 0
|
|
}
|
|
if remaining <= nextRestart {
|
|
commitSinceNextRestart++
|
|
if 4*commitSinceNextRestart > 3*commitSinceLastEmptyParent {
|
|
g.Close()
|
|
remainingPaths := make([]string, 0, len(paths))
|
|
for i, pth := range paths {
|
|
if results[i] == "" {
|
|
remainingPaths = append(remainingPaths, pth)
|
|
}
|
|
}
|
|
g = NewLogNameStatusRepoParser(ctx, repo.Path, lastEmptyParent, treepath, remainingPaths...)
|
|
parentRemaining = map[string]bool{}
|
|
nextRestart = (remaining * 3) / 4
|
|
continue heaploop
|
|
}
|
|
}
|
|
for _, parent := range current.ParentIDs {
|
|
parentRemaining[parent] = true
|
|
}
|
|
}
|
|
g.Close()
|
|
|
|
resultsMap := map[string]string{}
|
|
for i, pth := range paths {
|
|
resultsMap[pth] = results[i]
|
|
}
|
|
|
|
return resultsMap, nil
|
|
}
|