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// Copyright 2020 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.
//go:build gogit
package pipeline
import (
"bufio"
"fmt"
"io"
"sort"
"strings"
"sync"
"time"
"code.gitea.io/gitea/modules/git"
gogit "github.com/go-git/go-git/v5"
"github.com/go-git/go-git/v5/plumbing/object"
)
// 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
gogitRepo := repo.GoGitRepo()
commitsIter, err := gogitRepo.Log(&gogit.LogOptions{
Order: gogit.LogOrderCommitterTime,
All: true,
})
if err != nil {
return nil, fmt.Errorf("Failed to get GoGit CommitsIter. Error: %w", err)
}
err = commitsIter.ForEach(func(gitCommit *object.Commit) error {
tree, err := gitCommit.Tree()
if err != nil {
return err
}
treeWalker := object.NewTreeWalker(tree, true, nil)
defer treeWalker.Close()
for {
name, entry, err := treeWalker.Next()
if err == io.EOF {
break
}
if entry.Hash == hash {
result := LFSResult{
Name: name,
SHA: gitCommit.Hash.String(),
Summary: strings.Split(strings.TrimSpace(gitCommit.Message), "\n")[0],
When: gitCommit.Author.When,
ParentHashes: gitCommit.ParentHashes,
}
resultsMap[gitCommit.Hash.String()+":"+name] = &result
}
}
return nil
})
if err != nil && err != io.EOF {
return nil, fmt.Errorf("Failure in CommitIter.ForEach: %w", 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 {
i := 0
if i < len(result.SHA) {
n, err := shasToNameWriter.Write([]byte(result.SHA)[i:])
if err != nil {
errChan <- err
break
}
i += n
}
n := 0
for n < 1 {
n, 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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