mirror of https://github.com/go-gitea/gitea.git
99 lines
2.8 KiB
Go
99 lines
2.8 KiB
Go
// Copyright 2021 The Gitea Authors. All rights reserved.
|
|
// SPDX-License-Identifier: MIT
|
|
|
|
//go:build !gogit
|
|
|
|
package lfs
|
|
|
|
import (
|
|
"bufio"
|
|
"context"
|
|
"errors"
|
|
"io"
|
|
"strconv"
|
|
"strings"
|
|
|
|
"code.gitea.io/gitea/modules/git"
|
|
"code.gitea.io/gitea/modules/git/gitcmd"
|
|
"code.gitea.io/gitea/modules/git/pipeline"
|
|
"code.gitea.io/gitea/modules/util"
|
|
|
|
"golang.org/x/sync/errgroup"
|
|
)
|
|
|
|
// SearchPointerBlobs scans the whole repository for LFS pointer files
|
|
func SearchPointerBlobs(ctx context.Context, repo *git.Repository, pointerChan chan<- PointerBlob) error {
|
|
cmd1AllObjs, cmd3BatchContent := gitcmd.NewCommand(), gitcmd.NewCommand()
|
|
|
|
cmd1AllObjsStdout, cmd1AllObjsStdoutClose := cmd1AllObjs.MakeStdoutPipe()
|
|
defer cmd1AllObjsStdoutClose()
|
|
|
|
cmd3BatchContentIn, cmd3BatchContentOut, cmd3BatchContentClose := cmd3BatchContent.MakeStdinStdoutPipe()
|
|
defer cmd3BatchContentClose()
|
|
|
|
// Create the go-routines in reverse order (update: the order is not needed any more, the pipes are properly prepared)
|
|
wg := errgroup.Group{}
|
|
// 4. 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
|
|
wg.Go(func() error {
|
|
return createPointerResultsFromCatFileBatch(cmd3BatchContentOut, pointerChan)
|
|
})
|
|
|
|
// 3. Take the shas of the blobs and batch read them
|
|
wg.Go(func() error {
|
|
return pipeline.CatFileBatch(ctx, cmd3BatchContent, repo.Path)
|
|
})
|
|
|
|
// 2. From the provided objects restrict to blobs <=1k
|
|
wg.Go(func() error {
|
|
return pipeline.BlobsLessThan1024FromCatFileBatchCheck(cmd1AllObjsStdout, cmd3BatchContentIn)
|
|
})
|
|
|
|
// 1. Run batch-check on all objects in the repository
|
|
wg.Go(func() error {
|
|
return pipeline.CatFileBatchCheckAllObjects(ctx, cmd1AllObjs, repo.Path)
|
|
})
|
|
err := wg.Wait()
|
|
close(pointerChan)
|
|
return err
|
|
}
|
|
|
|
func createPointerResultsFromCatFileBatch(catFileBatchReader io.ReadCloser, pointerChan chan<- PointerBlob) error {
|
|
defer catFileBatchReader.Close()
|
|
|
|
bufferedReader := bufio.NewReader(catFileBatchReader)
|
|
buf := make([]byte, 1025)
|
|
|
|
for {
|
|
// File descriptor line: sha
|
|
sha, err := bufferedReader.ReadString(' ')
|
|
if err != nil {
|
|
return util.Iif(errors.Is(err, io.EOF), nil, err)
|
|
}
|
|
sha = strings.TrimSpace(sha)
|
|
// Throw away the blob
|
|
if _, err := bufferedReader.ReadString(' '); err != nil {
|
|
return err
|
|
}
|
|
sizeStr, err := bufferedReader.ReadString('\n')
|
|
if err != nil {
|
|
return err
|
|
}
|
|
size, err := strconv.Atoi(sizeStr[:len(sizeStr)-1])
|
|
if err != nil {
|
|
return err
|
|
}
|
|
pointerBuf := buf[:size+1]
|
|
if _, err := io.ReadFull(bufferedReader, pointerBuf); err != nil {
|
|
return err
|
|
}
|
|
pointerBuf = pointerBuf[:size]
|
|
// Now we need to check if the pointerBuf is an LFS pointer
|
|
pointer, _ := ReadPointerFromBuffer(pointerBuf)
|
|
if !pointer.IsValid() {
|
|
continue
|
|
}
|
|
pointerChan <- PointerBlob{Hash: sha, Pointer: pointer}
|
|
}
|
|
}
|