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Add tests for Repack()
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14
src/restic/repository/prune.go
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14
src/restic/repository/prune.go
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package repository
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import (
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"restic/backend"
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"restic/debug"
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)
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// Repack takes a list of packs together with a list of blobs contained in
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// these packs. Each pack is loaded and the blobs listed in keepBlobs is saved
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// into a new pack. Afterwards, the packs are removed.
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func Repack(repo *Repository, packs, keepBlobs backend.IDSet) error {
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debug.Log("Repack", "repacking %d packs while keeping %d blobs", len(packs), len(keepBlobs))
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return nil
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}
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211
src/restic/repository/prune_test.go
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211
src/restic/repository/prune_test.go
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package repository
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import (
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"io"
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"math/rand"
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"restic/backend"
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"restic/pack"
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"testing"
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)
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func randomSize(min, max int) int {
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return rand.Intn(max-min) + min
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}
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func random(t *testing.T, length int) []byte {
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src := rand.New(rand.NewSource(int64(length)))
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buf := make([]byte, length)
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_, err := io.ReadFull(src, buf)
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if err != nil {
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t.Fatalf("unable to read %d random bytes: %v", length, err)
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}
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return buf
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}
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func createRandomBlobs(t *testing.T, repo *Repository, blobs int, pData float32) {
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for i := 0; i < blobs; i++ {
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var (
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tpe pack.BlobType
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length int
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)
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if rand.Float32() < pData {
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tpe = pack.Data
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length = randomSize(50*1024, 2*1024*1024) // 50KiB to 2MiB of data
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} else {
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tpe = pack.Tree
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length = randomSize(5*1024, 50*1024) // 5KiB to 50KiB
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}
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_, err := repo.SaveAndEncrypt(tpe, random(t, length), nil)
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if err != nil {
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t.Fatalf("SaveFrom() error %v", err)
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}
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if rand.Float32() < 0.2 {
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if err = repo.Flush(); err != nil {
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t.Fatalf("repo.Flush() returned error %v", err)
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}
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}
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}
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if err := repo.Flush(); err != nil {
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t.Fatalf("repo.Flush() returned error %v", err)
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}
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}
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// redundancy returns the amount of duplicate data in the repo. It only looks
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// at all pack files.
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func redundancy(t *testing.T, repo *Repository) float32 {
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done := make(chan struct{})
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defer close(done)
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type redEntry struct {
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count int
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size int
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}
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red := make(map[backend.ID]redEntry)
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for id := range repo.List(backend.Data, done) {
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entries, err := repo.ListPack(id)
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if err != nil {
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t.Fatalf("error listing pack %v: %v", id.Str(), err)
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}
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for _, e := range entries {
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updatedEntry := redEntry{
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count: 1,
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size: int(e.Length),
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}
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if oldEntry, ok := red[e.ID]; ok {
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updatedEntry.count += oldEntry.count
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if updatedEntry.size != oldEntry.size {
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t.Fatalf("sizes do not match: %v != %v", updatedEntry.size, oldEntry.size)
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}
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}
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red[e.ID] = updatedEntry
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}
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}
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totalBytes := 0
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redundantBytes := 0
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for _, v := range red {
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totalBytes += v.count * v.size
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if v.count > 1 {
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redundantBytes += (v.count - 1) * v.size
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}
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}
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return float32(redundantBytes) / float32(totalBytes)
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}
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// selectBlobs returns a list of random blobs from the repository with probability p.
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func selectBlobs(t *testing.T, repo *Repository, p float32) backend.IDSet {
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done := make(chan struct{})
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defer close(done)
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blobs := backend.NewIDSet()
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for id := range repo.List(backend.Data, done) {
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entries, err := repo.ListPack(id)
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if err != nil {
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t.Fatalf("error listing pack %v: %v", id, err)
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}
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for _, entry := range entries {
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if rand.Float32() <= p {
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blobs.Insert(entry.ID)
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}
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}
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}
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return blobs
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}
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func listPacks(t *testing.T, repo *Repository) backend.IDSet {
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done := make(chan struct{})
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defer close(done)
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list := backend.NewIDSet()
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for id := range repo.List(backend.Data, done) {
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list.Insert(id)
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}
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return list
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}
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func findPacksForBlobs(t *testing.T, repo *Repository, blobs backend.IDSet) backend.IDSet {
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packs := backend.NewIDSet()
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idx := repo.Index()
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for id := range blobs {
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pb, err := idx.Lookup(id)
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if err != nil {
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t.Fatal(err)
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}
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packs.Insert(pb.PackID)
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}
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return packs
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}
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func TestRepack(t *testing.T) {
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repo, cleanup := TestRepository(t)
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defer cleanup()
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createRandomBlobs(t, repo, rand.Intn(400), 0.7)
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packsBefore := listPacks(t, repo)
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// Running repack on empty ID sets should not do anything at all.
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err := Repack(repo, nil, nil)
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if err != nil {
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t.Fatal(err)
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}
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packsAfter := listPacks(t, repo)
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if !packsAfter.Equals(packsBefore) {
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t.Fatalf("packs are not equal, Repack modified something. Before:\n %v\nAfter:\n %v",
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packsBefore, packsAfter)
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}
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if err := repo.SaveIndex(); err != nil {
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t.Fatalf("repo.SaveIndex() %v", err)
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}
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blobs := selectBlobs(t, repo, 0.2)
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t.Logf("selected %d blobs: %v", len(blobs), blobs)
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packs := findPacksForBlobs(t, repo, blobs)
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err = Repack(repo, packs, blobs)
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if err != nil {
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t.Fatalf("Repack() error %v", err)
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}
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packsAfter = listPacks(t, repo)
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for id := range packs {
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if packsAfter.Has(id) {
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t.Errorf("pack %v still present although it should have been repacked and removed", id.Str())
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}
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}
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idx := repo.Index()
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for id := range blobs {
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pb, err := idx.Lookup(id)
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if err != nil {
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t.Errorf("unable to find blob %v in repo", id.Str())
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}
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if packs.Has(pb.PackID) {
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t.Errorf("lookup returned pack ID %v that should've been removed", pb.PackID)
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}
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}
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}
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