forked from mirror/codeberg-forgejo
112 lines
3.1 KiB
Go
112 lines
3.1 KiB
Go
// Copyright 2021 The Gitea Authors. All rights reserved.
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// SPDX-License-Identifier: MIT
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//go:build !gogit
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package lfs
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import (
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"bufio"
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"context"
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"io"
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"strconv"
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"strings"
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"sync"
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"code.gitea.io/gitea/modules/git"
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"code.gitea.io/gitea/modules/git/pipeline"
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)
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// SearchPointerBlobs scans the whole repository for LFS pointer files
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func SearchPointerBlobs(ctx context.Context, repo *git.Repository, pointerChan chan<- PointerBlob, errChan chan<- error) {
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basePath := repo.Path
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catFileCheckReader, catFileCheckWriter := io.Pipe()
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shasToBatchReader, shasToBatchWriter := io.Pipe()
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catFileBatchReader, catFileBatchWriter := io.Pipe()
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wg := sync.WaitGroup{}
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wg.Add(4)
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// Create the go-routines in reverse order.
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// 4. Take the output of cat-file --batch and check if each file in turn
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// to see if they're pointers to files in the LFS store
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go createPointerResultsFromCatFileBatch(ctx, catFileBatchReader, &wg, pointerChan)
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// 3. Take the shas of the blobs and batch read them
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go pipeline.CatFileBatch(ctx, shasToBatchReader, catFileBatchWriter, &wg, basePath)
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// 2. From the provided objects restrict to blobs <=1k
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go pipeline.BlobsLessThan1024FromCatFileBatchCheck(catFileCheckReader, shasToBatchWriter, &wg)
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// 1. Run batch-check on all objects in the repository
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if git.CheckGitVersionAtLeast("2.6.0") != nil {
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revListReader, revListWriter := io.Pipe()
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shasToCheckReader, shasToCheckWriter := io.Pipe()
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wg.Add(2)
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go pipeline.CatFileBatchCheck(ctx, shasToCheckReader, catFileCheckWriter, &wg, basePath)
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go pipeline.BlobsFromRevListObjects(revListReader, shasToCheckWriter, &wg)
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go pipeline.RevListAllObjects(ctx, revListWriter, &wg, basePath, errChan)
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} else {
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go pipeline.CatFileBatchCheckAllObjects(ctx, catFileCheckWriter, &wg, basePath, errChan)
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}
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wg.Wait()
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close(pointerChan)
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close(errChan)
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}
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func createPointerResultsFromCatFileBatch(ctx context.Context, catFileBatchReader *io.PipeReader, wg *sync.WaitGroup, pointerChan chan<- PointerBlob) {
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defer wg.Done()
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defer catFileBatchReader.Close()
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bufferedReader := bufio.NewReader(catFileBatchReader)
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buf := make([]byte, 1025)
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loop:
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for {
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select {
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case <-ctx.Done():
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break loop
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default:
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}
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// File descriptor line: sha
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sha, err := bufferedReader.ReadString(' ')
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if err != nil {
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_ = catFileBatchReader.CloseWithError(err)
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break
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}
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sha = strings.TrimSpace(sha)
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// Throw away the blob
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if _, err := bufferedReader.ReadString(' '); err != nil {
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_ = catFileBatchReader.CloseWithError(err)
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break
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}
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sizeStr, err := bufferedReader.ReadString('\n')
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if err != nil {
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_ = catFileBatchReader.CloseWithError(err)
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break
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}
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size, err := strconv.Atoi(sizeStr[:len(sizeStr)-1])
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if err != nil {
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_ = catFileBatchReader.CloseWithError(err)
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break
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}
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pointerBuf := buf[:size+1]
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if _, err := io.ReadFull(bufferedReader, pointerBuf); err != nil {
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_ = catFileBatchReader.CloseWithError(err)
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break
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}
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pointerBuf = pointerBuf[:size]
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// Now we need to check if the pointerBuf is an LFS pointer
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pointer, _ := ReadPointerFromBuffer(pointerBuf)
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if !pointer.IsValid() {
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continue
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}
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pointerChan <- PointerBlob{Hash: sha, Pointer: pointer}
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}
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}
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