package repository_test import ( "context" "math/rand" "testing" "time" "github.com/restic/restic/internal/repository" "github.com/restic/restic/internal/restic" rtest "github.com/restic/restic/internal/test" "golang.org/x/sync/errgroup" ) func randomSize(min, max int) int { return rand.Intn(max-min) + min } func createRandomBlobs(t testing.TB, repo restic.Repository, blobs int, pData float32) { var wg errgroup.Group repo.StartPackUploader(context.TODO(), &wg) for i := 0; i < blobs; i++ { var ( tpe restic.BlobType length int ) if rand.Float32() < pData { tpe = restic.DataBlob length = randomSize(10*1024, 1024*1024) // 10KiB to 1MiB of data } else { tpe = restic.TreeBlob length = randomSize(1*1024, 20*1024) // 1KiB to 20KiB } buf := make([]byte, length) rand.Read(buf) id, exists, _, err := repo.SaveBlob(context.TODO(), tpe, buf, restic.ID{}, false) if err != nil { t.Fatalf("SaveFrom() error %v", err) } if exists { t.Errorf("duplicate blob %v/%v ignored", id, restic.DataBlob) continue } if rand.Float32() < 0.2 { if err = repo.Flush(context.Background()); err != nil { t.Fatalf("repo.Flush() returned error %v", err) } repo.StartPackUploader(context.TODO(), &wg) } } if err := repo.Flush(context.Background()); err != nil { t.Fatalf("repo.Flush() returned error %v", err) } } func createRandomWrongBlob(t testing.TB, repo restic.Repository) { length := randomSize(10*1024, 1024*1024) // 10KiB to 1MiB of data buf := make([]byte, length) rand.Read(buf) id := restic.Hash(buf) // invert first data byte buf[0] ^= 0xff var wg errgroup.Group repo.StartPackUploader(context.TODO(), &wg) _, _, _, err := repo.SaveBlob(context.TODO(), restic.DataBlob, buf, id, false) if err != nil { t.Fatalf("SaveFrom() error %v", err) } if err := repo.Flush(context.Background()); err != nil { t.Fatalf("repo.Flush() returned error %v", err) } } // selectBlobs splits the list of all blobs randomly into two lists. A blob // will be contained in the firstone ith probability p. func selectBlobs(t *testing.T, repo restic.Repository, p float32) (list1, list2 restic.BlobSet) { list1 = restic.NewBlobSet() list2 = restic.NewBlobSet() blobs := restic.NewBlobSet() err := repo.List(context.TODO(), restic.PackFile, func(id restic.ID, size int64) error { entries, _, err := repo.ListPack(context.TODO(), id, size) if err != nil { t.Fatalf("error listing pack %v: %v", id, err) } for _, entry := range entries { h := restic.BlobHandle{ID: entry.ID, Type: entry.Type} if blobs.Has(h) { t.Errorf("ignoring duplicate blob %v", h) return nil } blobs.Insert(h) if rand.Float32() <= p { list1.Insert(restic.BlobHandle{ID: entry.ID, Type: entry.Type}) } else { list2.Insert(restic.BlobHandle{ID: entry.ID, Type: entry.Type}) } } return nil }) if err != nil { t.Fatal(err) } return list1, list2 } func listPacks(t *testing.T, repo restic.Repository) restic.IDSet { list := restic.NewIDSet() err := repo.List(context.TODO(), restic.PackFile, func(id restic.ID, size int64) error { list.Insert(id) return nil }) if err != nil { t.Fatal(err) } return list } func findPacksForBlobs(t *testing.T, repo restic.Repository, blobs restic.BlobSet) restic.IDSet { packs := restic.NewIDSet() idx := repo.Index() for h := range blobs { list := idx.Lookup(h) if len(list) == 0 { t.Fatal("Failed to find blob", h.ID.Str(), "with type", h.Type) } for _, pb := range list { packs.Insert(pb.PackID) } } return packs } func repack(t *testing.T, repo restic.Repository, packs restic.IDSet, blobs restic.BlobSet) { repackedBlobs, err := repository.Repack(context.TODO(), repo, repo, packs, blobs, nil) if err != nil { t.Fatal(err) } for id := range repackedBlobs { err = repo.Backend().Remove(context.TODO(), restic.Handle{Type: restic.PackFile, Name: id.String()}) if err != nil { t.Fatal(err) } } } func flush(t *testing.T, repo restic.Repository) { if err := repo.Flush(context.TODO()); err != nil { t.Fatalf("repo.SaveIndex() %v", err) } } func rebuildIndex(t *testing.T, repo restic.Repository) { err := repo.SetIndex(repository.NewMasterIndex()) if err != nil { t.Fatal(err) } packs := make(map[restic.ID]int64) err = repo.List(context.TODO(), restic.PackFile, func(id restic.ID, size int64) error { packs[id] = size return nil }) if err != nil { t.Fatal(err) } _, err = repo.(*repository.Repository).CreateIndexFromPacks(context.TODO(), packs, nil) if err != nil { t.Fatal(err) } err = repo.List(context.TODO(), restic.IndexFile, func(id restic.ID, size int64) error { h := restic.Handle{ Type: restic.IndexFile, Name: id.String(), } return repo.Backend().Remove(context.TODO(), h) }) if err != nil { t.Fatal(err) } _, err = repo.Index().Save(context.TODO(), repo, restic.NewIDSet(), nil, nil) if err != nil { t.Fatal(err) } } func reloadIndex(t *testing.T, repo restic.Repository) { err := repo.SetIndex(repository.NewMasterIndex()) if err != nil { t.Fatal(err) } if err := repo.LoadIndex(context.TODO()); err != nil { t.Fatalf("error loading new index: %v", err) } } func TestRepack(t *testing.T) { repository.TestAllVersions(t, testRepack) } func testRepack(t *testing.T, version uint) { repo, cleanup := repository.TestRepositoryWithVersion(t, version) defer cleanup() seed := time.Now().UnixNano() rand.Seed(seed) t.Logf("rand seed is %v", seed) createRandomBlobs(t, repo, 100, 0.7) packsBefore := listPacks(t, repo) // Running repack on empty ID sets should not do anything at all. repack(t, repo, nil, nil) packsAfter := listPacks(t, repo) if !packsAfter.Equals(packsBefore) { t.Fatalf("packs are not equal, Repack modified something. Before:\n %v\nAfter:\n %v", packsBefore, packsAfter) } flush(t, repo) removeBlobs, keepBlobs := selectBlobs(t, repo, 0.2) removePacks := findPacksForBlobs(t, repo, removeBlobs) repack(t, repo, removePacks, keepBlobs) rebuildIndex(t, repo) reloadIndex(t, repo) packsAfter = listPacks(t, repo) for id := range removePacks { if packsAfter.Has(id) { t.Errorf("pack %v still present although it should have been repacked and removed", id.Str()) } } idx := repo.Index() for h := range keepBlobs { list := idx.Lookup(h) if len(list) == 0 { t.Errorf("unable to find blob %v in repo", h.ID.Str()) continue } if len(list) != 1 { t.Errorf("expected one pack in the list, got: %v", list) continue } pb := list[0] if removePacks.Has(pb.PackID) { t.Errorf("lookup returned pack ID %v that should've been removed", pb.PackID) } } for h := range removeBlobs { if _, found := repo.LookupBlobSize(h.ID, h.Type); found { t.Errorf("blob %v still contained in the repo", h) } } } func TestRepackCopy(t *testing.T) { repository.TestAllVersions(t, testRepackCopy) } func testRepackCopy(t *testing.T, version uint) { repo, cleanup := repository.TestRepositoryWithVersion(t, version) defer cleanup() dstRepo, dstCleanup := repository.TestRepositoryWithVersion(t, version) defer dstCleanup() seed := time.Now().UnixNano() rand.Seed(seed) t.Logf("rand seed is %v", seed) createRandomBlobs(t, repo, 100, 0.7) flush(t, repo) _, keepBlobs := selectBlobs(t, repo, 0.2) copyPacks := findPacksForBlobs(t, repo, keepBlobs) _, err := repository.Repack(context.TODO(), repo, dstRepo, copyPacks, keepBlobs, nil) if err != nil { t.Fatal(err) } rebuildIndex(t, dstRepo) reloadIndex(t, dstRepo) idx := dstRepo.Index() for h := range keepBlobs { list := idx.Lookup(h) if len(list) == 0 { t.Errorf("unable to find blob %v in repo", h.ID.Str()) continue } if len(list) != 1 { t.Errorf("expected one pack in the list, got: %v", list) continue } } } func TestRepackWrongBlob(t *testing.T) { repository.TestAllVersions(t, testRepackWrongBlob) } func testRepackWrongBlob(t *testing.T, version uint) { repo, cleanup := repository.TestRepositoryWithVersion(t, version) defer cleanup() seed := time.Now().UnixNano() rand.Seed(seed) t.Logf("rand seed is %v", seed) createRandomBlobs(t, repo, 5, 0.7) createRandomWrongBlob(t, repo) // just keep all blobs, but also rewrite every pack _, keepBlobs := selectBlobs(t, repo, 0) rewritePacks := findPacksForBlobs(t, repo, keepBlobs) _, err := repository.Repack(context.TODO(), repo, repo, rewritePacks, keepBlobs, nil) if err == nil { t.Fatal("expected repack to fail but got no error") } t.Logf("found expected error: %v", err) } func TestRepackBlobFallback(t *testing.T) { repository.TestAllVersions(t, testRepackBlobFallback) } func testRepackBlobFallback(t *testing.T, version uint) { repo, cleanup := repository.TestRepositoryWithVersion(t, version) defer cleanup() seed := time.Now().UnixNano() rand.Seed(seed) t.Logf("rand seed is %v", seed) length := randomSize(10*1024, 1024*1024) // 10KiB to 1MiB of data buf := make([]byte, length) rand.Read(buf) id := restic.Hash(buf) // corrupted copy modbuf := make([]byte, len(buf)) copy(modbuf, buf) // invert first data byte modbuf[0] ^= 0xff // create pack with broken copy var wg errgroup.Group repo.StartPackUploader(context.TODO(), &wg) _, _, _, err := repo.SaveBlob(context.TODO(), restic.DataBlob, modbuf, id, false) rtest.OK(t, err) rtest.OK(t, repo.Flush(context.Background())) // find pack with damaged blob keepBlobs := restic.NewBlobSet(restic.BlobHandle{Type: restic.DataBlob, ID: id}) rewritePacks := findPacksForBlobs(t, repo, keepBlobs) // create pack with valid copy repo.StartPackUploader(context.TODO(), &wg) _, _, _, err = repo.SaveBlob(context.TODO(), restic.DataBlob, buf, id, true) rtest.OK(t, err) rtest.OK(t, repo.Flush(context.Background())) // repack must fallback to valid copy _, err = repository.Repack(context.TODO(), repo, repo, rewritePacks, keepBlobs, nil) rtest.OK(t, err) keepBlobs = restic.NewBlobSet(restic.BlobHandle{Type: restic.DataBlob, ID: id}) packs := findPacksForBlobs(t, repo, keepBlobs) rtest.Assert(t, len(packs) == 3, "unexpected number of copies: %v", len(packs)) }