restic/internal/checker/checker_test.go

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package checker_test
import (
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"context"
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"io"
"io/ioutil"
"math/rand"
"os"
"path/filepath"
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"sort"
"strconv"
"sync"
"testing"
"time"
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"github.com/restic/restic/internal/archiver"
"github.com/restic/restic/internal/checker"
"github.com/restic/restic/internal/errors"
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"github.com/restic/restic/internal/repository"
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"github.com/restic/restic/internal/restic"
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"github.com/restic/restic/internal/test"
)
var checkerTestData = filepath.Join("testdata", "checker-test-repo.tar.gz")
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func collectErrors(ctx context.Context, f func(context.Context, chan<- error)) (errs []error) {
ctx, cancel := context.WithCancel(ctx)
defer cancel()
errChan := make(chan error)
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go f(ctx, errChan)
for err := range errChan {
errs = append(errs, err)
}
return errs
}
func checkPacks(chkr *checker.Checker) []error {
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return collectErrors(context.TODO(), chkr.Packs)
}
func checkStruct(chkr *checker.Checker) []error {
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return collectErrors(context.TODO(), chkr.Structure)
}
func checkData(chkr *checker.Checker) []error {
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return collectErrors(
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context.TODO(),
func(ctx context.Context, errCh chan<- error) {
chkr.ReadData(ctx, errCh)
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},
)
}
func TestCheckRepo(t *testing.T) {
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repodir, cleanup := test.Env(t, checkerTestData)
defer cleanup()
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repo := repository.TestOpenLocal(t, repodir)
chkr := checker.New(repo, false)
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hints, errs := chkr.LoadIndex(context.TODO())
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if len(errs) > 0 {
t.Fatalf("expected no errors, got %v: %v", len(errs), errs)
}
if len(hints) > 0 {
t.Errorf("expected no hints, got %v: %v", len(hints), hints)
}
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test.OKs(t, checkPacks(chkr))
test.OKs(t, checkStruct(chkr))
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}
func TestMissingPack(t *testing.T) {
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repodir, cleanup := test.Env(t, checkerTestData)
defer cleanup()
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repo := repository.TestOpenLocal(t, repodir)
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packHandle := restic.Handle{
Type: restic.PackFile,
Name: "657f7fb64f6a854fff6fe9279998ee09034901eded4e6db9bcee0e59745bbce6",
}
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test.OK(t, repo.Backend().Remove(context.TODO(), packHandle))
chkr := checker.New(repo, false)
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hints, errs := chkr.LoadIndex(context.TODO())
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if len(errs) > 0 {
t.Fatalf("expected no errors, got %v: %v", len(errs), errs)
}
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if len(hints) > 0 {
t.Errorf("expected no hints, got %v: %v", len(hints), hints)
}
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errs = checkPacks(chkr)
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test.Assert(t, len(errs) == 1,
"expected exactly one error, got %v", len(errs))
if err, ok := errs[0].(checker.PackError); ok {
test.Equals(t, packHandle.Name, err.ID.String())
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} else {
t.Errorf("expected error returned by checker.Packs() to be PackError, got %v", err)
}
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}
func TestUnreferencedPack(t *testing.T) {
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repodir, cleanup := test.Env(t, checkerTestData)
defer cleanup()
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repo := repository.TestOpenLocal(t, repodir)
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// index 3f1a only references pack 60e0
packID := "60e0438dcb978ec6860cc1f8c43da648170ee9129af8f650f876bad19f8f788e"
indexHandle := restic.Handle{
Type: restic.IndexFile,
Name: "3f1abfcb79c6f7d0a3be517d2c83c8562fba64ef2c8e9a3544b4edaf8b5e3b44",
}
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test.OK(t, repo.Backend().Remove(context.TODO(), indexHandle))
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chkr := checker.New(repo, false)
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hints, errs := chkr.LoadIndex(context.TODO())
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if len(errs) > 0 {
t.Fatalf("expected no errors, got %v: %v", len(errs), errs)
}
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if len(hints) > 0 {
t.Errorf("expected no hints, got %v: %v", len(hints), hints)
}
errs = checkPacks(chkr)
test.Assert(t, len(errs) == 1,
"expected exactly one error, got %v", len(errs))
if err, ok := errs[0].(checker.PackError); ok {
test.Equals(t, packID, err.ID.String())
} else {
t.Errorf("expected error returned by checker.Packs() to be PackError, got %v", err)
}
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}
func TestUnreferencedBlobs(t *testing.T) {
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repodir, cleanup := test.Env(t, checkerTestData)
defer cleanup()
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repo := repository.TestOpenLocal(t, repodir)
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snapshotHandle := restic.Handle{
Type: restic.SnapshotFile,
Name: "51d249d28815200d59e4be7b3f21a157b864dc343353df9d8e498220c2499b02",
}
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test.OK(t, repo.Backend().Remove(context.TODO(), snapshotHandle))
unusedBlobsBySnapshot := restic.BlobHandles{
restic.TestParseHandle("58c748bbe2929fdf30c73262bd8313fe828f8925b05d1d4a87fe109082acb849", restic.DataBlob),
restic.TestParseHandle("988a272ab9768182abfd1fe7d7a7b68967825f0b861d3b36156795832c772235", restic.DataBlob),
restic.TestParseHandle("c01952de4d91da1b1b80bc6e06eaa4ec21523f4853b69dc8231708b9b7ec62d8", restic.TreeBlob),
restic.TestParseHandle("bec3a53d7dc737f9a9bee68b107ec9e8ad722019f649b34d474b9982c3a3fec7", restic.TreeBlob),
restic.TestParseHandle("2a6f01e5e92d8343c4c6b78b51c5a4dc9c39d42c04e26088c7614b13d8d0559d", restic.TreeBlob),
restic.TestParseHandle("18b51b327df9391732ba7aaf841a4885f350d8a557b2da8352c9acf8898e3f10", restic.DataBlob),
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}
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sort.Sort(unusedBlobsBySnapshot)
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chkr := checker.New(repo, true)
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hints, errs := chkr.LoadIndex(context.TODO())
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if len(errs) > 0 {
t.Fatalf("expected no errors, got %v: %v", len(errs), errs)
}
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if len(hints) > 0 {
t.Errorf("expected no hints, got %v: %v", len(hints), hints)
}
test.OKs(t, checkPacks(chkr))
test.OKs(t, checkStruct(chkr))
blobs := chkr.UnusedBlobs(context.TODO())
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sort.Sort(blobs)
test.Equals(t, unusedBlobsBySnapshot, blobs)
}
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func TestModifiedIndex(t *testing.T) {
repodir, cleanup := test.Env(t, checkerTestData)
defer cleanup()
repo := repository.TestOpenLocal(t, repodir)
done := make(chan struct{})
defer close(done)
h := restic.Handle{
Type: restic.IndexFile,
Name: "90f838b4ac28735fda8644fe6a08dbc742e57aaf81b30977b4fefa357010eafd",
}
tmpfile, err := ioutil.TempFile("", "restic-test-mod-index-")
if err != nil {
t.Fatal(err)
}
defer func() {
err := tmpfile.Close()
if err != nil {
t.Fatal(err)
}
err = os.Remove(tmpfile.Name())
if err != nil {
t.Fatal(err)
}
}()
// read the file from the backend
err = repo.Backend().Load(context.TODO(), h, 0, 0, func(rd io.Reader) error {
_, err := io.Copy(tmpfile, rd)
return err
})
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test.OK(t, err)
// save the index again with a modified name so that the hash doesn't match
// the content any more
h2 := restic.Handle{
Type: restic.IndexFile,
Name: "80f838b4ac28735fda8644fe6a08dbc742e57aaf81b30977b4fefa357010eafd",
}
rd, err := restic.NewFileReader(tmpfile)
if err != nil {
t.Fatal(err)
}
err = repo.Backend().Save(context.TODO(), h2, rd)
if err != nil {
t.Fatal(err)
}
chkr := checker.New(repo, false)
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hints, errs := chkr.LoadIndex(context.TODO())
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if len(errs) == 0 {
t.Fatalf("expected errors not found")
}
for _, err := range errs {
t.Logf("found expected error %v", err)
}
if len(hints) > 0 {
t.Errorf("expected no hints, got %v: %v", len(hints), hints)
}
}
var checkerDuplicateIndexTestData = filepath.Join("testdata", "duplicate-packs-in-index-test-repo.tar.gz")
func TestDuplicatePacksInIndex(t *testing.T) {
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repodir, cleanup := test.Env(t, checkerDuplicateIndexTestData)
defer cleanup()
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repo := repository.TestOpenLocal(t, repodir)
chkr := checker.New(repo, false)
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hints, errs := chkr.LoadIndex(context.TODO())
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if len(hints) == 0 {
t.Fatalf("did not get expected checker hints for duplicate packs in indexes")
}
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found := false
for _, hint := range hints {
if _, ok := hint.(checker.ErrDuplicatePacks); ok {
found = true
} else {
t.Errorf("got unexpected hint: %v", hint)
}
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}
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if !found {
t.Fatalf("did not find hint ErrDuplicatePacks")
}
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if len(errs) > 0 {
t.Errorf("expected no errors, got %v: %v", len(errs), errs)
}
}
// errorBackend randomly modifies data after reading.
type errorBackend struct {
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restic.Backend
ProduceErrors bool
}
func (b errorBackend) Load(ctx context.Context, h restic.Handle, length int, offset int64, consumer func(rd io.Reader) error) error {
return b.Backend.Load(ctx, h, length, offset, func(rd io.Reader) error {
if b.ProduceErrors {
return consumer(errorReadCloser{rd})
}
return consumer(rd)
})
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}
type errorReadCloser struct {
io.Reader
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}
func (erd errorReadCloser) Read(p []byte) (int, error) {
n, err := erd.Reader.Read(p)
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if n > 0 {
induceError(p[:n])
}
return n, err
}
// induceError flips a bit in the slice.
func induceError(data []byte) {
if rand.Float32() < 0.2 {
return
}
pos := rand.Intn(len(data))
data[pos] ^= 1
}
func TestCheckerModifiedData(t *testing.T) {
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repo, cleanup := repository.TestRepository(t)
defer cleanup()
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sn := archiver.TestSnapshot(t, repo, ".", nil)
t.Logf("archived as %v", sn.ID().Str())
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beError := &errorBackend{Backend: repo.Backend()}
checkRepo := repository.New(beError)
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test.OK(t, checkRepo.SearchKey(context.TODO(), test.TestPassword, 5, ""))
chkr := checker.New(checkRepo, false)
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hints, errs := chkr.LoadIndex(context.TODO())
if len(errs) > 0 {
t.Fatalf("expected no errors, got %v: %v", len(errs), errs)
}
if len(hints) > 0 {
t.Errorf("expected no hints, got %v: %v", len(hints), hints)
}
beError.ProduceErrors = true
errFound := false
for _, err := range checkPacks(chkr) {
t.Logf("pack error: %v", err)
}
for _, err := range checkStruct(chkr) {
t.Logf("struct error: %v", err)
}
for _, err := range checkData(chkr) {
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t.Logf("data error: %v", err)
errFound = true
}
if !errFound {
t.Fatal("no error found, checker is broken")
}
}
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// loadTreesOnceRepository allows each tree to be loaded only once
type loadTreesOnceRepository struct {
restic.Repository
loadedTrees restic.IDSet
mutex sync.Mutex
DuplicateTree bool
}
func (r *loadTreesOnceRepository) LoadTree(ctx context.Context, id restic.ID) (*restic.Tree, error) {
r.mutex.Lock()
defer r.mutex.Unlock()
if r.loadedTrees.Has(id) {
// additionally store error to ensure that it cannot be swallowed
r.DuplicateTree = true
return nil, errors.Errorf("trying to load tree with id %v twice", id)
}
r.loadedTrees.Insert(id)
return r.Repository.LoadTree(ctx, id)
}
func TestCheckerNoDuplicateTreeDecodes(t *testing.T) {
repodir, cleanup := test.Env(t, checkerTestData)
defer cleanup()
repo := repository.TestOpenLocal(t, repodir)
checkRepo := &loadTreesOnceRepository{
Repository: repo,
loadedTrees: restic.NewIDSet(),
}
chkr := checker.New(checkRepo, false)
hints, errs := chkr.LoadIndex(context.TODO())
if len(errs) > 0 {
t.Fatalf("expected no errors, got %v: %v", len(errs), errs)
}
if len(hints) > 0 {
t.Errorf("expected no hints, got %v: %v", len(hints), hints)
}
test.OKs(t, checkPacks(chkr))
test.OKs(t, checkStruct(chkr))
test.Assert(t, !checkRepo.DuplicateTree, "detected duplicate tree loading")
}
// delayRepository delays read of a specific handle.
type delayRepository struct {
restic.Repository
DelayTree restic.ID
UnblockChannel chan struct{}
Unblocker sync.Once
}
func (r *delayRepository) LoadTree(ctx context.Context, id restic.ID) (*restic.Tree, error) {
if id == r.DelayTree {
<-r.UnblockChannel
}
return r.Repository.LoadTree(ctx, id)
}
func (r *delayRepository) LookupBlobSize(id restic.ID, t restic.BlobType) (uint, bool) {
if id == r.DelayTree && t == restic.DataBlob {
r.Unblock()
}
return r.Repository.LookupBlobSize(id, t)
}
func (r *delayRepository) Unblock() {
r.Unblocker.Do(func() {
close(r.UnblockChannel)
})
}
func TestCheckerBlobTypeConfusion(t *testing.T) {
ctx, cancel := context.WithTimeout(context.Background(), time.Second)
defer cancel()
repo, cleanup := repository.TestRepository(t)
defer cleanup()
damagedNode := &restic.Node{
Name: "damaged",
Type: "file",
Mode: 0644,
Size: 42,
Content: restic.IDs{restic.TestParseID("0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef")},
}
damagedTree := &restic.Tree{
Nodes: []*restic.Node{damagedNode},
}
id, err := repo.SaveTree(ctx, damagedTree)
test.OK(t, repo.Flush(ctx))
test.OK(t, err)
buf, err := repo.LoadBlob(ctx, restic.TreeBlob, id, nil)
test.OK(t, err)
_, _, err = repo.SaveBlob(ctx, restic.DataBlob, buf, id, false)
test.OK(t, err)
malNode := &restic.Node{
Name: "aaaaa",
Type: "file",
Mode: 0644,
Size: uint64(len(buf)),
Content: restic.IDs{id},
}
dirNode := &restic.Node{
Name: "bbbbb",
Type: "dir",
Mode: 0755,
Subtree: &id,
}
rootTree := &restic.Tree{
Nodes: []*restic.Node{malNode, dirNode},
}
rootId, err := repo.SaveTree(ctx, rootTree)
test.OK(t, err)
test.OK(t, repo.Flush(ctx))
test.OK(t, repo.SaveIndex(ctx))
snapshot, err := restic.NewSnapshot([]string{"/damaged"}, []string{"test"}, "foo", time.Now())
test.OK(t, err)
snapshot.Tree = &rootId
snapId, err := repo.SaveJSONUnpacked(ctx, restic.SnapshotFile, snapshot)
test.OK(t, err)
t.Logf("saved snapshot %v", snapId.Str())
delayRepo := &delayRepository{
Repository: repo,
DelayTree: id,
UnblockChannel: make(chan struct{}),
}
chkr := checker.New(delayRepo, false)
go func() {
<-ctx.Done()
delayRepo.Unblock()
}()
hints, errs := chkr.LoadIndex(ctx)
if len(errs) > 0 {
t.Fatalf("expected no errors, got %v: %v", len(errs), errs)
}
if len(hints) > 0 {
t.Errorf("expected no hints, got %v: %v", len(hints), hints)
}
errFound := false
for _, err := range checkStruct(chkr) {
t.Logf("struct error: %v", err)
errFound = true
}
test.OK(t, ctx.Err())
if !errFound {
t.Fatal("no error found, checker is broken")
}
}
func loadBenchRepository(t *testing.B) (*checker.Checker, restic.Repository, func()) {
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repodir, cleanup := test.Env(t, checkerTestData)
repo := repository.TestOpenLocal(t, repodir)
chkr := checker.New(repo, false)
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hints, errs := chkr.LoadIndex(context.TODO())
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if len(errs) > 0 {
defer cleanup()
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t.Fatalf("expected no errors, got %v: %v", len(errs), errs)
}
if len(hints) > 0 {
t.Errorf("expected no hints, got %v: %v", len(hints), hints)
}
return chkr, repo, cleanup
}
func BenchmarkChecker(t *testing.B) {
chkr, _, cleanup := loadBenchRepository(t)
defer cleanup()
t.ResetTimer()
for i := 0; i < t.N; i++ {
test.OKs(t, checkPacks(chkr))
test.OKs(t, checkStruct(chkr))
test.OKs(t, checkData(chkr))
}
}
func benchmarkSnapshotScaling(t *testing.B, newSnapshots int) {
chkr, repo, cleanup := loadBenchRepository(t)
defer cleanup()
snID, err := restic.FindSnapshot(context.TODO(), repo, "51d249d2")
if err != nil {
t.Fatal(err)
}
var sn2 restic.Snapshot
err = repo.LoadJSONUnpacked(context.TODO(), restic.SnapshotFile, snID, &sn2)
if err != nil {
t.Fatal(err)
}
treeID := sn2.Tree
for i := 0; i < newSnapshots; i++ {
sn, err := restic.NewSnapshot([]string{"test" + strconv.Itoa(i)}, nil, "", time.Now())
if err != nil {
t.Fatal(err)
}
sn.Tree = treeID
_, err = repo.SaveJSONUnpacked(context.TODO(), restic.SnapshotFile, sn)
if err != nil {
t.Fatal(err)
}
}
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t.ResetTimer()
for i := 0; i < t.N; i++ {
test.OKs(t, checkPacks(chkr))
test.OKs(t, checkStruct(chkr))
test.OKs(t, checkData(chkr))
}
}
func BenchmarkCheckerSnapshotScaling(b *testing.B) {
counts := []int{50, 100, 200}
for _, count := range counts {
count := count
b.Run(strconv.Itoa(count), func(b *testing.B) {
benchmarkSnapshotScaling(b, count)
})
}
}