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// Copyright 2020 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
//go:build !gogit
package pipeline
import (
"bufio"
"bytes"
"fmt"
"io"
"sort"
"strings"
"sync"
"time"
"code.gitea.io/gitea/modules/git"
)
// LFSResult represents commits found using a provided pointer file hash
type LFSResult struct {
Name string
SHA string
Summary string
When time.Time
ParentHashes []git.SHA1
BranchName string
FullCommitName string
}
type lfsResultSlice []*LFSResult
func (a lfsResultSlice) Len() int { return len(a) }
func (a lfsResultSlice) Swap(i, j int) { a[i], a[j] = a[j], a[i] }
func (a lfsResultSlice) Less(i, j int) bool { return a[j].When.After(a[i].When) }
// FindLFSFile finds commits that contain a provided pointer file hash
func FindLFSFile(repo *git.Repository, hash git.SHA1) ([]*LFSResult, error) {
resultsMap := map[string]*LFSResult{}
results := make([]*LFSResult, 0)
basePath := repo.Path
// Use rev-list to provide us with all commits in order
revListReader, revListWriter := io.Pipe()
defer func() {
_ = revListWriter.Close()
_ = revListReader.Close()
}()
go func() {
stderr := strings.Builder{}
err := git.NewCommand(repo.Ctx, "rev-list", "--all").Run(&git.RunOpts{
Dir: repo.Path,
Stdout: revListWriter,
Stderr: &stderr,
})
if err != nil {
_ = revListWriter.CloseWithError(git.ConcatenateError(err, (&stderr).String()))
} else {
_ = revListWriter.Close()
}
}()
// Next 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
batchStdinWriter, batchReader, cancel := repo.CatFileBatch(repo.Ctx)
defer cancel()
// We'll use a scanner for the revList because it's simpler than a bufio.Reader
scan := bufio.NewScanner(revListReader)
trees := [][]byte{}
paths := []string{}
fnameBuf := make([]byte, 4096)
modeBuf := make([]byte, 40)
workingShaBuf := make([]byte, 20)
for scan.Scan() {
// Get the next commit ID
commitID := scan.Bytes()
// push the commit to the cat-file --batch process
_, err := batchStdinWriter.Write(commitID)
if err != nil {
return nil, err
}
_, err = batchStdinWriter.Write([]byte{'\n'})
if err != nil {
return nil, err
}
var curCommit *git.Commit
curPath := ""
commitReadingLoop:
for {
_, typ, size, err := git.ReadBatchLine(batchReader)
if err != nil {
return nil, err
}
switch typ {
case "tag":
// This shouldn't happen but if it does well just get the commit and try again
id, err := git.ReadTagObjectID(batchReader, size)
if err != nil {
return nil, err
}
_, err = batchStdinWriter.Write([]byte(id + "\n"))
if err != nil {
return nil, err
}
continue
case "commit":
// Read in the commit to get its tree and in case this is one of the last used commits
curCommit, err = git.CommitFromReader(repo, git.MustIDFromString(string(commitID)), io.LimitReader(batchReader, size))
if err != nil {
return nil, err
}
if _, err := batchReader.Discard(1); err != nil {
return nil, err
}
_, err := batchStdinWriter.Write([]byte(curCommit.Tree.ID.String() + "\n"))
if err != nil {
return nil, err
}
curPath = ""
case "tree":
var n int64
for n < size {
mode, fname, sha20byte, count, err := git.ParseTreeLine(batchReader, modeBuf, fnameBuf, workingShaBuf)
if err != nil {
return nil, err
}
n += int64(count)
if bytes.Equal(sha20byte, hash[:]) {
result := LFSResult{
Name: curPath + string(fname),
SHA: curCommit.ID.String(),
Summary: strings.Split(strings.TrimSpace(curCommit.CommitMessage), "\n")[0],
When: curCommit.Author.When,
ParentHashes: curCommit.Parents,
}
resultsMap[curCommit.ID.String()+":"+curPath+string(fname)] = &result
} else if string(mode) == git.EntryModeTree.String() {
sha40Byte := make([]byte, 40)
git.To40ByteSHA(sha20byte, sha40Byte)
trees = append(trees, sha40Byte)
paths = append(paths, curPath+string(fname)+"/")
}
}
if _, err := batchReader.Discard(1); err != nil {
return nil, err
}
if len(trees) > 0 {
_, err := batchStdinWriter.Write(trees[len(trees)-1])
if err != nil {
return nil, err
}
_, err = batchStdinWriter.Write([]byte("\n"))
if err != nil {
return nil, err
}
curPath = paths[len(paths)-1]
trees = trees[:len(trees)-1]
paths = paths[:len(paths)-1]
} else {
break commitReadingLoop
}
}
}
}
if err := scan.Err(); err != nil {
return nil, err
}
for _, result := range resultsMap {
hasParent := false
for _, parentHash := range result.ParentHashes {
if _, hasParent = resultsMap[parentHash.String()+":"+result.Name]; hasParent {
break
}
}
if !hasParent {
results = append(results, result)
}
}
sort.Sort(lfsResultSlice(results))
// Should really use a go-git function here but name-rev is not completed and recapitulating it is not simple
shasToNameReader, shasToNameWriter := io.Pipe()
nameRevStdinReader, nameRevStdinWriter := io.Pipe()
errChan := make(chan error, 1)
wg := sync.WaitGroup{}
wg.Add(3)
go func() {
defer wg.Done()
scanner := bufio.NewScanner(nameRevStdinReader)
i := 0
for scanner.Scan() {
line := scanner.Text()
if len(line) == 0 {
continue
}
result := results[i]
result.FullCommitName = line
result.BranchName = strings.Split(line, "~")[0]
i++
}
}()
go NameRevStdin(repo.Ctx, shasToNameReader, nameRevStdinWriter, &wg, basePath)
go func() {
defer wg.Done()
defer shasToNameWriter.Close()
for _, result := range results {
_, err := shasToNameWriter.Write([]byte(result.SHA))
if err != nil {
errChan <- err
break
}
_, err = shasToNameWriter.Write([]byte{'\n'})
if err != nil {
errChan <- err
break
}
}
}()
wg.Wait()
select {
case err, has := <-errChan:
if has {
return nil, fmt.Errorf("Unable to obtain name for LFS files. Error: %w", err)
}
default:
}
return results, nil
}
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