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gitea-fork-majority-judgment/modules/pull/lfs.go

227 lines
7.3 KiB

// Copyright 2019 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 pull
import (
"bufio"
"bytes"
"fmt"
"io"
"strconv"
"strings"
"sync"
"code.gitea.io/gitea/models"
"code.gitea.io/gitea/modules/git"
"code.gitea.io/gitea/modules/lfs"
"code.gitea.io/gitea/modules/log"
)
// LFSPush pushes lfs objects referred to in new commits in the head repository from the base repository
func LFSPush(tmpBasePath, mergeHeadSHA, mergeBaseSHA string, pr *models.PullRequest) error {
// Now we have to implement git lfs push
// git rev-list --objects --filter=blob:limit=1k HEAD --not base
// pass blob shas in to git cat-file --batch-check (possibly unnecessary)
// ensure only blobs and <=1k size then pass in to git cat-file --batch
// to read each sha and check each as a pointer
// Then if they are lfs -> add them to the baseRepo
revListReader, revListWriter := io.Pipe()
shasToCheckReader, shasToCheckWriter := io.Pipe()
catFileCheckReader, catFileCheckWriter := io.Pipe()
shasToBatchReader, shasToBatchWriter := io.Pipe()
catFileBatchReader, catFileBatchWriter := io.Pipe()
errChan := make(chan error, 1)
wg := sync.WaitGroup{}
wg.Add(6)
// Create the go-routines in reverse order.
// 6. Take the output of cat-file --batch and check if each file in turn
// to see if they're pointers to files in the LFS store associated with
// the head repo and add them to the base repo if so
go readCatFileBatch(catFileBatchReader, &wg, pr)
// 5. Take the shas of the blobs and batch read them
go doCatFileBatch(shasToBatchReader, catFileBatchWriter, &wg, tmpBasePath)
// 4. From the provided objects restrict to blobs <=1k
go readCatFileBatchCheck(catFileCheckReader, shasToBatchWriter, &wg)
// 3. Run batch-check on the objects retrieved from rev-list
go doCatFileBatchCheck(shasToCheckReader, catFileCheckWriter, &wg, tmpBasePath)
// 2. Check each object retrieved rejecting those without names as they will be commits or trees
go readRevListObjects(revListReader, shasToCheckWriter, &wg)
// 1. Run rev-list objects from mergeHead to mergeBase
go doRevListObjects(revListWriter, &wg, tmpBasePath, mergeHeadSHA, mergeBaseSHA, errChan)
wg.Wait()
select {
case err, has := <-errChan:
if has {
return err
}
default:
}
return nil
}
func doRevListObjects(revListWriter *io.PipeWriter, wg *sync.WaitGroup, tmpBasePath, headSHA, baseSHA string, errChan chan<- error) {
defer wg.Done()
defer revListWriter.Close()
stderr := new(bytes.Buffer)
var errbuf strings.Builder
cmd := git.NewCommand("rev-list", "--objects", headSHA, "--not", baseSHA)
if err := cmd.RunInDirPipeline(tmpBasePath, revListWriter, stderr); err != nil {
log.Error("git rev-list [%s]: %v - %s", tmpBasePath, err, errbuf.String())
errChan <- fmt.Errorf("git rev-list [%s]: %v - %s", tmpBasePath, err, errbuf.String())
}
}
func readRevListObjects(revListReader *io.PipeReader, shasToCheckWriter *io.PipeWriter, wg *sync.WaitGroup) {
defer wg.Done()
defer revListReader.Close()
defer shasToCheckWriter.Close()
scanner := bufio.NewScanner(revListReader)
for scanner.Scan() {
line := scanner.Text()
if len(line) == 0 {
continue
}
fields := strings.Split(line, " ")
if len(fields) < 2 || len(fields[1]) == 0 {
continue
}
toWrite := []byte(fields[0] + "\n")
for len(toWrite) > 0 {
n, err := shasToCheckWriter.Write(toWrite)
if err != nil {
_ = revListReader.CloseWithError(err)
break
}
toWrite = toWrite[n:]
}
}
_ = shasToCheckWriter.CloseWithError(scanner.Err())
}
func doCatFileBatchCheck(shasToCheckReader *io.PipeReader, catFileCheckWriter *io.PipeWriter, wg *sync.WaitGroup, tmpBasePath string) {
defer wg.Done()
defer shasToCheckReader.Close()
defer catFileCheckWriter.Close()
stderr := new(bytes.Buffer)
var errbuf strings.Builder
cmd := git.NewCommand("cat-file", "--batch-check")
if err := cmd.RunInDirFullPipeline(tmpBasePath, catFileCheckWriter, stderr, shasToCheckReader); err != nil {
_ = catFileCheckWriter.CloseWithError(fmt.Errorf("git cat-file --batch-check [%s]: %v - %s", tmpBasePath, err, errbuf.String()))
}
}
func readCatFileBatchCheck(catFileCheckReader *io.PipeReader, shasToBatchWriter *io.PipeWriter, wg *sync.WaitGroup) {
defer wg.Done()
defer catFileCheckReader.Close()
scanner := bufio.NewScanner(catFileCheckReader)
defer func() {
_ = shasToBatchWriter.CloseWithError(scanner.Err())
}()
for scanner.Scan() {
line := scanner.Text()
if len(line) == 0 {
continue
}
fields := strings.Split(line, " ")
if len(fields) < 3 || fields[1] != "blob" {
continue
}
size, _ := strconv.Atoi(fields[2])
if size > 1024 {
continue
}
toWrite := []byte(fields[0] + "\n")
for len(toWrite) > 0 {
n, err := shasToBatchWriter.Write(toWrite)
if err != nil {
_ = catFileCheckReader.CloseWithError(err)
break
}
toWrite = toWrite[n:]
}
}
}
func doCatFileBatch(shasToBatchReader *io.PipeReader, catFileBatchWriter *io.PipeWriter, wg *sync.WaitGroup, tmpBasePath string) {
defer wg.Done()
defer shasToBatchReader.Close()
defer catFileBatchWriter.Close()
stderr := new(bytes.Buffer)
var errbuf strings.Builder
if err := git.NewCommand("cat-file", "--batch").RunInDirFullPipeline(tmpBasePath, catFileBatchWriter, stderr, shasToBatchReader); err != nil {
_ = shasToBatchReader.CloseWithError(fmt.Errorf("git rev-list [%s]: %v - %s", tmpBasePath, err, errbuf.String()))
}
}
func readCatFileBatch(catFileBatchReader *io.PipeReader, wg *sync.WaitGroup, pr *models.PullRequest) {
defer wg.Done()
defer catFileBatchReader.Close()
bufferedReader := bufio.NewReader(catFileBatchReader)
buf := make([]byte, 1025)
for {
// File descriptor line: sha
_, err := bufferedReader.ReadString(' ')
if err != nil {
_ = catFileBatchReader.CloseWithError(err)
break
}
// Throw away the blob
if _, err := bufferedReader.ReadString(' '); err != nil {
_ = catFileBatchReader.CloseWithError(err)
break
}
sizeStr, err := bufferedReader.ReadString('\n')
if err != nil {
_ = catFileBatchReader.CloseWithError(err)
break
}
size, err := strconv.Atoi(sizeStr[:len(sizeStr)-1])
if err != nil {
_ = catFileBatchReader.CloseWithError(err)
break
}
pointerBuf := buf[:size+1]
if _, err := io.ReadFull(bufferedReader, pointerBuf); err != nil {
_ = catFileBatchReader.CloseWithError(err)
break
}
pointerBuf = pointerBuf[:size]
// Now we need to check if the pointerBuf is an LFS pointer
pointer := lfs.IsPointerFile(&pointerBuf)
if pointer == nil {
continue
}
// Then we need to check that this pointer is in the db
if _, err := pr.HeadRepo.GetLFSMetaObjectByOid(pointer.Oid); err != nil {
if err == models.ErrLFSObjectNotExist {
log.Warn("During merge of: %d in %-v, there is a pointer to LFS Oid: %s which although present in the LFS store is not associated with the head repo %-v", pr.Index, pr.BaseRepo, pointer.Oid, pr.HeadRepo)
continue
}
_ = catFileBatchReader.CloseWithError(err)
break
}
// OK we have a pointer that is associated with the head repo
// and is actually a file in the LFS
// Therefore it should be associated with the base repo
pointer.RepositoryID = pr.BaseRepoID
if _, err := models.NewLFSMetaObject(pointer); err != nil {
_ = catFileBatchReader.CloseWithError(err)
break
}
}
}