package repository_test import ( "context" "io" "math/rand" "testing" "github.com/restic/restic/internal/index" "github.com/restic/restic/internal/repository" "github.com/restic/restic/internal/restic" ) func randomSize(min, max int) int { return rand.Intn(max-min) + min } func random(t testing.TB, length int) []byte { rd := restic.NewRandReader(rand.New(rand.NewSource(int64(length)))) buf := make([]byte, length) _, err := io.ReadFull(rd, buf) if err != nil { t.Fatalf("unable to read %d random bytes: %v", length, err) } return buf } func createRandomBlobs(t testing.TB, repo restic.Repository, blobs int, pData float32) { 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 := random(t, length) id := restic.Hash(buf) if repo.Index().Has(id, restic.DataBlob) { t.Errorf("duplicate blob %v/%v ignored", id, restic.DataBlob) continue } _, err := repo.SaveBlob(context.TODO(), tpe, buf, id) if err != nil { t.Fatalf("SaveFrom() error %v", err) } if rand.Float32() < 0.2 { if err = repo.Flush(context.Background()); err != nil { t.Fatalf("repo.Flush() returned 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() for id := range repo.List(context.TODO(), restic.DataFile) { entries, _, err := repo.ListPack(context.TODO(), id) 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) continue } 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 list1, list2 } func listPacks(t *testing.T, repo restic.Repository) restic.IDSet { list := restic.NewIDSet() for id := range repo.List(context.TODO(), restic.DataFile) { list.Insert(id) } 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, err := idx.Lookup(h.ID, h.Type) if err != nil { t.Fatal(err) } 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, packs, blobs, nil) if err != nil { t.Fatal(err) } for id := range repackedBlobs { err = repo.Backend().Remove(context.TODO(), restic.Handle{Type: restic.DataFile, Name: id.String()}) if err != nil { t.Fatal(err) } } } func saveIndex(t *testing.T, repo restic.Repository) { if err := repo.SaveIndex(context.TODO()); err != nil { t.Fatalf("repo.SaveIndex() %v", err) } } func rebuildIndex(t *testing.T, repo restic.Repository) { idx, _, err := index.New(context.TODO(), repo, restic.NewIDSet(), nil) if err != nil { t.Fatal(err) } for id := range repo.List(context.TODO(), restic.IndexFile) { h := restic.Handle{ Type: restic.IndexFile, Name: id.String(), } err = repo.Backend().Remove(context.TODO(), h) if err != nil { t.Fatal(err) } } _, err = idx.Save(context.TODO(), repo, nil) if err != nil { t.Fatal(err) } } func reloadIndex(t *testing.T, repo restic.Repository) { repo.SetIndex(repository.NewMasterIndex()) if err := repo.LoadIndex(context.TODO()); err != nil { t.Fatalf("error loading new index: %v", err) } } func TestRepack(t *testing.T) { repo, cleanup := repository.TestRepository(t) defer cleanup() 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) } saveIndex(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, err := idx.Lookup(h.ID, h.Type) if err != nil { 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 _, err := idx.Lookup(h.ID, h.Type); err == nil { t.Errorf("blob %v still contained in the repo", h) } } }