restic/internal/repository/repack_test.go

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package repository_test
import (
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"context"
"math/rand"
"testing"
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"github.com/restic/restic/internal/index"
"github.com/restic/restic/internal/repository"
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"github.com/restic/restic/internal/restic"
)
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func randomSize(min, max int) int {
return rand.Intn(max-min) + min
}
func createRandomBlobs(t testing.TB, repo restic.Repository, blobs int, pData float32) {
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for i := 0; i < blobs; i++ {
var (
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tpe restic.BlobType
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length int
)
if rand.Float32() < pData {
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tpe = restic.DataBlob
length = randomSize(10*1024, 1024*1024) // 10KiB to 1MiB of data
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} else {
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tpe = restic.TreeBlob
length = randomSize(1*1024, 20*1024) // 1KiB to 20KiB
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}
buf := make([]byte, length)
rand.Read(buf)
id, exists, err := repo.SaveBlob(context.TODO(), tpe, buf, restic.ID{}, false)
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if err != nil {
t.Fatalf("SaveFrom() error %v", err)
}
if exists {
t.Errorf("duplicate blob %v/%v ignored", id, restic.DataBlob)
continue
}
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if rand.Float32() < 0.2 {
if err = repo.Flush(context.Background()); err != nil {
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t.Fatalf("repo.Flush() returned error %v", err)
}
}
}
if err := repo.Flush(context.Background()); err != nil {
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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
_, _, 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)
}
}
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// 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) {
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list1 = restic.NewBlobSet()
list2 = restic.NewBlobSet()
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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)
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if err != nil {
t.Fatalf("error listing pack %v: %v", id, err)
}
for _, entry := range entries {
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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)
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if rand.Float32() <= p {
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list1.Insert(restic.BlobHandle{ID: entry.ID, Type: entry.Type})
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} else {
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list2.Insert(restic.BlobHandle{ID: entry.ID, Type: entry.Type})
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}
}
return nil
})
if err != nil {
t.Fatal(err)
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}
return list1, list2
}
func listPacks(t *testing.T, repo restic.Repository) restic.IDSet {
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list := restic.NewIDSet()
err := repo.List(context.TODO(), restic.PackFile, func(id restic.ID, size int64) error {
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list.Insert(id)
return nil
})
if err != nil {
t.Fatal(err)
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}
return list
}
func findPacksForBlobs(t *testing.T, repo restic.Repository, blobs restic.BlobSet) restic.IDSet {
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packs := restic.NewIDSet()
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idx := repo.Index()
for h := range blobs {
list := idx.Lookup(h.ID, h.Type)
if len(list) == 0 {
t.Fatal("Failed to find blob", h.ID.Str(), "with type", h.Type)
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}
for _, pb := range list {
packs.Insert(pb.PackID)
}
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}
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.PackFile, Name: id.String()})
if err != nil {
t.Fatal(err)
}
}
}
func saveIndex(t *testing.T, repo restic.Repository) {
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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)
}
err = repo.List(context.TODO(), restic.IndexFile, func(id restic.ID, size int64) error {
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h := restic.Handle{
Type: restic.IndexFile,
Name: id.String(),
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}
return repo.Backend().Remove(context.TODO(), h)
})
if err != nil {
t.Fatal(err)
}
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_, 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())
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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()
seed := rand.Int63()
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)
}
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 := idx.Lookup(h.ID, h.Type)
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 TestRepackWrongBlob(t *testing.T) {
repo, cleanup := repository.TestRepository(t)
defer cleanup()
seed := rand.Int63()
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, rewritePacks, keepBlobs, nil)
if err == nil {
t.Fatal("expected repack to fail but got no error")
}
t.Log(err)
}