mirror of
https://github.com/restic/restic.git
synced 2024-12-23 16:26:11 +00:00
676 lines
17 KiB
Go
676 lines
17 KiB
Go
package repository_test
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import (
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"bytes"
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"context"
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"crypto/sha256"
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"encoding/json"
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"fmt"
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"io"
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"math/rand"
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"os"
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"path/filepath"
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"strings"
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"testing"
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"time"
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"github.com/google/go-cmp/cmp"
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"github.com/klauspost/compress/zstd"
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"github.com/restic/restic/internal/backend/local"
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"github.com/restic/restic/internal/crypto"
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"github.com/restic/restic/internal/index"
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"github.com/restic/restic/internal/repository"
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"github.com/restic/restic/internal/restic"
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rtest "github.com/restic/restic/internal/test"
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"golang.org/x/sync/errgroup"
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)
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var testSizes = []int{5, 23, 2<<18 + 23, 1 << 20}
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var rnd = rand.New(rand.NewSource(time.Now().UnixNano()))
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func TestSave(t *testing.T) {
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repository.TestAllVersions(t, testSave)
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}
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func testSave(t *testing.T, version uint) {
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repo := repository.TestRepositoryWithVersion(t, version)
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for _, size := range testSizes {
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data := make([]byte, size)
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_, err := io.ReadFull(rnd, data)
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rtest.OK(t, err)
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id := restic.Hash(data)
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var wg errgroup.Group
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repo.StartPackUploader(context.TODO(), &wg)
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// save
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sid, _, _, err := repo.SaveBlob(context.TODO(), restic.DataBlob, data, restic.ID{}, false)
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rtest.OK(t, err)
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rtest.Equals(t, id, sid)
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rtest.OK(t, repo.Flush(context.Background()))
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// rtest.OK(t, repo.SaveIndex())
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// read back
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buf, err := repo.LoadBlob(context.TODO(), restic.DataBlob, id, nil)
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rtest.OK(t, err)
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rtest.Equals(t, size, len(buf))
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rtest.Assert(t, len(buf) == len(data),
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"number of bytes read back does not match: expected %d, got %d",
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len(data), len(buf))
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rtest.Assert(t, bytes.Equal(buf, data),
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"data does not match: expected %02x, got %02x",
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data, buf)
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}
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}
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func TestSaveFrom(t *testing.T) {
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repository.TestAllVersions(t, testSaveFrom)
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}
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func testSaveFrom(t *testing.T, version uint) {
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repo := repository.TestRepositoryWithVersion(t, version)
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for _, size := range testSizes {
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data := make([]byte, size)
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_, err := io.ReadFull(rnd, data)
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rtest.OK(t, err)
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id := restic.Hash(data)
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var wg errgroup.Group
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repo.StartPackUploader(context.TODO(), &wg)
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// save
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id2, _, _, err := repo.SaveBlob(context.TODO(), restic.DataBlob, data, id, false)
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rtest.OK(t, err)
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rtest.Equals(t, id, id2)
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rtest.OK(t, repo.Flush(context.Background()))
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// read back
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buf, err := repo.LoadBlob(context.TODO(), restic.DataBlob, id, nil)
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rtest.OK(t, err)
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rtest.Equals(t, size, len(buf))
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rtest.Assert(t, len(buf) == len(data),
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"number of bytes read back does not match: expected %d, got %d",
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len(data), len(buf))
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rtest.Assert(t, bytes.Equal(buf, data),
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"data does not match: expected %02x, got %02x",
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data, buf)
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}
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}
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func BenchmarkSaveAndEncrypt(t *testing.B) {
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repository.BenchmarkAllVersions(t, benchmarkSaveAndEncrypt)
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}
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func benchmarkSaveAndEncrypt(t *testing.B, version uint) {
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repo := repository.TestRepositoryWithVersion(t, version)
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size := 4 << 20 // 4MiB
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data := make([]byte, size)
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_, err := io.ReadFull(rnd, data)
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rtest.OK(t, err)
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id := restic.ID(sha256.Sum256(data))
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var wg errgroup.Group
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repo.StartPackUploader(context.Background(), &wg)
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t.ReportAllocs()
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t.ResetTimer()
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t.SetBytes(int64(size))
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for i := 0; i < t.N; i++ {
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_, _, _, err = repo.SaveBlob(context.TODO(), restic.DataBlob, data, id, true)
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rtest.OK(t, err)
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}
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}
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func TestLoadBlob(t *testing.T) {
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repository.TestAllVersions(t, testLoadBlob)
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}
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func testLoadBlob(t *testing.T, version uint) {
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repo := repository.TestRepositoryWithVersion(t, version)
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length := 1000000
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buf := crypto.NewBlobBuffer(length)
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_, err := io.ReadFull(rnd, buf)
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rtest.OK(t, err)
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var wg errgroup.Group
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repo.StartPackUploader(context.TODO(), &wg)
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id, _, _, err := repo.SaveBlob(context.TODO(), restic.DataBlob, buf, restic.ID{}, false)
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rtest.OK(t, err)
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rtest.OK(t, repo.Flush(context.Background()))
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base := crypto.CiphertextLength(length)
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for _, testlength := range []int{0, base - 20, base - 1, base, base + 7, base + 15, base + 1000} {
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buf = make([]byte, 0, testlength)
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buf, err := repo.LoadBlob(context.TODO(), restic.DataBlob, id, buf)
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if err != nil {
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t.Errorf("LoadBlob() returned an error for buffer size %v: %v", testlength, err)
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continue
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}
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if len(buf) != length {
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t.Errorf("LoadBlob() returned the wrong number of bytes: want %v, got %v", length, len(buf))
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continue
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}
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}
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}
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func BenchmarkLoadBlob(b *testing.B) {
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repository.BenchmarkAllVersions(b, benchmarkLoadBlob)
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}
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func benchmarkLoadBlob(b *testing.B, version uint) {
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repo := repository.TestRepositoryWithVersion(b, version)
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length := 1000000
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buf := crypto.NewBlobBuffer(length)
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_, err := io.ReadFull(rnd, buf)
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rtest.OK(b, err)
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var wg errgroup.Group
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repo.StartPackUploader(context.TODO(), &wg)
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id, _, _, err := repo.SaveBlob(context.TODO(), restic.DataBlob, buf, restic.ID{}, false)
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rtest.OK(b, err)
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rtest.OK(b, repo.Flush(context.Background()))
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b.ResetTimer()
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b.SetBytes(int64(length))
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for i := 0; i < b.N; i++ {
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var err error
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buf, err = repo.LoadBlob(context.TODO(), restic.DataBlob, id, buf)
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// Checking the SHA-256 with restic.Hash can make up 38% of the time
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// spent in this loop, so pause the timer.
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b.StopTimer()
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rtest.OK(b, err)
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if len(buf) != length {
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b.Errorf("wanted %d bytes, got %d", length, len(buf))
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}
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id2 := restic.Hash(buf)
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if !id.Equal(id2) {
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b.Errorf("wrong data returned, wanted %v, got %v", id.Str(), id2.Str())
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}
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b.StartTimer()
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}
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}
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func BenchmarkLoadUnpacked(b *testing.B) {
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repository.BenchmarkAllVersions(b, benchmarkLoadUnpacked)
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}
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func benchmarkLoadUnpacked(b *testing.B, version uint) {
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repo := repository.TestRepositoryWithVersion(b, version)
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length := 1000000
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buf := crypto.NewBlobBuffer(length)
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_, err := io.ReadFull(rnd, buf)
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rtest.OK(b, err)
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dataID := restic.Hash(buf)
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storageID, err := repo.SaveUnpacked(context.TODO(), restic.PackFile, buf)
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rtest.OK(b, err)
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// rtest.OK(b, repo.Flush())
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b.ResetTimer()
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b.SetBytes(int64(length))
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for i := 0; i < b.N; i++ {
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data, err := repo.LoadUnpacked(context.TODO(), restic.PackFile, storageID)
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rtest.OK(b, err)
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// See comment in BenchmarkLoadBlob.
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b.StopTimer()
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if len(data) != length {
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b.Errorf("wanted %d bytes, got %d", length, len(data))
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}
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id2 := restic.Hash(data)
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if !dataID.Equal(id2) {
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b.Errorf("wrong data returned, wanted %v, got %v", storageID.Str(), id2.Str())
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}
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b.StartTimer()
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}
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}
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var repoFixture = filepath.Join("testdata", "test-repo.tar.gz")
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func TestRepositoryLoadIndex(t *testing.T) {
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repodir, cleanup := rtest.Env(t, repoFixture)
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defer cleanup()
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repo := repository.TestOpenLocal(t, repodir)
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rtest.OK(t, repo.LoadIndex(context.TODO()))
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}
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// loadIndex loads the index id from backend and returns it.
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func loadIndex(ctx context.Context, repo restic.Repository, id restic.ID) (*index.Index, error) {
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buf, err := repo.LoadUnpacked(ctx, restic.IndexFile, id)
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if err != nil {
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return nil, err
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}
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idx, oldFormat, err := index.DecodeIndex(buf, id)
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if oldFormat {
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fmt.Fprintf(os.Stderr, "index %v has old format\n", id.Str())
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}
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return idx, err
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}
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func TestRepositoryLoadUnpackedBroken(t *testing.T) {
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repodir, cleanup := rtest.Env(t, repoFixture)
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defer cleanup()
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data := rtest.Random(23, 12345)
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id := restic.Hash(data)
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h := restic.Handle{Type: restic.IndexFile, Name: id.String()}
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// damage buffer
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data[0] ^= 0xff
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repo := repository.TestOpenLocal(t, repodir)
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// store broken file
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err := repo.Backend().Save(context.TODO(), h, restic.NewByteReader(data, nil))
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rtest.OK(t, err)
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// without a retry backend this will just return an error that the file is broken
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_, err = repo.LoadUnpacked(context.TODO(), restic.IndexFile, id)
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if err == nil {
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t.Fatal("missing expected error")
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}
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rtest.Assert(t, strings.Contains(err.Error(), "invalid data returned"), "unexpected error: %v", err)
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}
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type damageOnceBackend struct {
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restic.Backend
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}
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func (be *damageOnceBackend) Load(ctx context.Context, h restic.Handle, length int, offset int64, fn func(rd io.Reader) error) error {
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// don't break the config file as we can't retry it
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if h.Type == restic.ConfigFile {
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return be.Backend.Load(ctx, h, length, offset, fn)
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}
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// return broken data on the first try
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err := be.Backend.Load(ctx, h, length+1, offset, fn)
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if err != nil {
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// retry
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err = be.Backend.Load(ctx, h, length, offset, fn)
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}
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return err
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}
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func TestRepositoryLoadUnpackedRetryBroken(t *testing.T) {
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repodir, cleanup := rtest.Env(t, repoFixture)
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defer cleanup()
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be, err := local.Open(context.TODO(), local.Config{Path: repodir, Connections: 2})
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rtest.OK(t, err)
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repo, err := repository.New(&damageOnceBackend{Backend: be}, repository.Options{})
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rtest.OK(t, err)
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err = repo.SearchKey(context.TODO(), rtest.TestPassword, 10, "")
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rtest.OK(t, err)
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rtest.OK(t, repo.LoadIndex(context.TODO()))
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}
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func BenchmarkLoadIndex(b *testing.B) {
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repository.BenchmarkAllVersions(b, benchmarkLoadIndex)
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}
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func benchmarkLoadIndex(b *testing.B, version uint) {
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repository.TestUseLowSecurityKDFParameters(b)
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repo := repository.TestRepositoryWithVersion(b, version)
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idx := index.NewIndex()
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for i := 0; i < 5000; i++ {
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idx.StorePack(restic.NewRandomID(), []restic.Blob{
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{
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BlobHandle: restic.NewRandomBlobHandle(),
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Length: 1234,
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Offset: 1235,
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},
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})
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}
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idx.Finalize()
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id, err := index.SaveIndex(context.TODO(), repo, idx)
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rtest.OK(b, err)
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b.Logf("index saved as %v", id.Str())
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fi, err := repo.Backend().Stat(context.TODO(), restic.Handle{Type: restic.IndexFile, Name: id.String()})
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rtest.OK(b, err)
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b.Logf("filesize is %v", fi.Size)
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b.ResetTimer()
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for i := 0; i < b.N; i++ {
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_, err := loadIndex(context.TODO(), repo, id)
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rtest.OK(b, err)
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}
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}
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// saveRandomDataBlobs generates random data blobs and saves them to the repository.
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func saveRandomDataBlobs(t testing.TB, repo restic.Repository, num int, sizeMax int) {
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var wg errgroup.Group
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repo.StartPackUploader(context.TODO(), &wg)
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for i := 0; i < num; i++ {
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size := rand.Int() % sizeMax
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buf := make([]byte, size)
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_, err := io.ReadFull(rnd, buf)
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rtest.OK(t, err)
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_, _, _, err = repo.SaveBlob(context.TODO(), restic.DataBlob, buf, restic.ID{}, false)
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rtest.OK(t, err)
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}
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}
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func TestRepositoryIncrementalIndex(t *testing.T) {
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repository.TestAllVersions(t, testRepositoryIncrementalIndex)
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}
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func testRepositoryIncrementalIndex(t *testing.T, version uint) {
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repo := repository.TestRepositoryWithVersion(t, version).(*repository.Repository)
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index.IndexFull = func(*index.Index, bool) bool { return true }
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// add a few rounds of packs
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for j := 0; j < 5; j++ {
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// add some packs, write intermediate index
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saveRandomDataBlobs(t, repo, 20, 1<<15)
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rtest.OK(t, repo.Flush(context.TODO()))
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}
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// save final index
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rtest.OK(t, repo.Flush(context.TODO()))
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packEntries := make(map[restic.ID]map[restic.ID]struct{})
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err := repo.List(context.TODO(), restic.IndexFile, func(id restic.ID, size int64) error {
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idx, err := loadIndex(context.TODO(), repo, id)
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rtest.OK(t, err)
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idx.Each(context.TODO(), func(pb restic.PackedBlob) {
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if _, ok := packEntries[pb.PackID]; !ok {
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packEntries[pb.PackID] = make(map[restic.ID]struct{})
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}
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packEntries[pb.PackID][id] = struct{}{}
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})
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return nil
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})
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if err != nil {
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t.Fatal(err)
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}
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for packID, ids := range packEntries {
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if len(ids) > 1 {
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t.Errorf("pack %v listed in %d indexes\n", packID, len(ids))
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}
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}
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}
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// buildPackfileWithoutHeader returns a manually built pack file without a header.
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func buildPackfileWithoutHeader(blobSizes []int, key *crypto.Key, compress bool) (blobs []restic.Blob, packfile []byte) {
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opts := []zstd.EOption{
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// Set the compression level configured.
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zstd.WithEncoderLevel(zstd.SpeedDefault),
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// Disable CRC, we have enough checks in place, makes the
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// compressed data four bytes shorter.
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zstd.WithEncoderCRC(false),
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// Set a window of 512kbyte, so we have good lookbehind for usual
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// blob sizes.
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zstd.WithWindowSize(512 * 1024),
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}
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enc, err := zstd.NewWriter(nil, opts...)
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if err != nil {
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panic(err)
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}
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var offset uint
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for i, size := range blobSizes {
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plaintext := rtest.Random(800+i, size)
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id := restic.Hash(plaintext)
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uncompressedLength := uint(0)
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if compress {
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uncompressedLength = uint(len(plaintext))
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plaintext = enc.EncodeAll(plaintext, nil)
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}
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// we use a deterministic nonce here so the whole process is
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// deterministic, last byte is the blob index
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var nonce = []byte{
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0x15, 0x98, 0xc0, 0xf7, 0xb9, 0x65, 0x97, 0x74,
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0x12, 0xdc, 0xd3, 0x62, 0xa9, 0x6e, 0x20, byte(i),
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}
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before := len(packfile)
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packfile = append(packfile, nonce...)
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packfile = key.Seal(packfile, nonce, plaintext, nil)
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after := len(packfile)
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ciphertextLength := after - before
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blobs = append(blobs, restic.Blob{
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BlobHandle: restic.BlobHandle{
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Type: restic.DataBlob,
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ID: id,
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},
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Length: uint(ciphertextLength),
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UncompressedLength: uncompressedLength,
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Offset: offset,
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})
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offset = uint(len(packfile))
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}
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return blobs, packfile
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}
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func TestStreamPack(t *testing.T) {
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repository.TestAllVersions(t, testStreamPack)
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}
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func testStreamPack(t *testing.T, version uint) {
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// always use the same key for deterministic output
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const jsonKey = `{"mac":{"k":"eQenuI8adktfzZMuC8rwdA==","r":"k8cfAly2qQSky48CQK7SBA=="},"encrypt":"MKO9gZnRiQFl8mDUurSDa9NMjiu9MUifUrODTHS05wo="}`
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var key crypto.Key
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err := json.Unmarshal([]byte(jsonKey), &key)
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if err != nil {
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t.Fatal(err)
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}
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blobSizes := []int{
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5522811,
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10,
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5231,
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18812,
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123123,
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13522811,
|
|
12301,
|
|
892242,
|
|
28616,
|
|
13351,
|
|
252287,
|
|
188883,
|
|
3522811,
|
|
18883,
|
|
}
|
|
|
|
var compress bool
|
|
switch version {
|
|
case 1:
|
|
compress = false
|
|
case 2:
|
|
compress = true
|
|
default:
|
|
t.Fatal("test does not suport repository version", version)
|
|
}
|
|
|
|
packfileBlobs, packfile := buildPackfileWithoutHeader(blobSizes, &key, compress)
|
|
|
|
loadCalls := 0
|
|
load := func(ctx context.Context, h restic.Handle, length int, offset int64, fn func(rd io.Reader) error) error {
|
|
data := packfile
|
|
|
|
if offset > int64(len(data)) {
|
|
offset = 0
|
|
length = 0
|
|
}
|
|
data = data[offset:]
|
|
|
|
if length > len(data) {
|
|
length = len(data)
|
|
}
|
|
|
|
data = data[:length]
|
|
loadCalls++
|
|
|
|
return fn(bytes.NewReader(data))
|
|
|
|
}
|
|
|
|
// first, test regular usage
|
|
t.Run("regular", func(t *testing.T) {
|
|
tests := []struct {
|
|
blobs []restic.Blob
|
|
calls int
|
|
}{
|
|
{packfileBlobs[1:2], 1},
|
|
{packfileBlobs[2:5], 1},
|
|
{packfileBlobs[2:8], 1},
|
|
{[]restic.Blob{
|
|
packfileBlobs[0],
|
|
packfileBlobs[4],
|
|
packfileBlobs[2],
|
|
}, 1},
|
|
{[]restic.Blob{
|
|
packfileBlobs[0],
|
|
packfileBlobs[len(packfileBlobs)-1],
|
|
}, 2},
|
|
}
|
|
|
|
for _, test := range tests {
|
|
t.Run("", func(t *testing.T) {
|
|
ctx, cancel := context.WithCancel(context.Background())
|
|
defer cancel()
|
|
|
|
gotBlobs := make(map[restic.ID]int)
|
|
|
|
handleBlob := func(blob restic.BlobHandle, buf []byte, err error) error {
|
|
gotBlobs[blob.ID]++
|
|
|
|
id := restic.Hash(buf)
|
|
if !id.Equal(blob.ID) {
|
|
t.Fatalf("wrong id %v for blob %s returned", id, blob.ID)
|
|
}
|
|
|
|
return err
|
|
}
|
|
|
|
wantBlobs := make(map[restic.ID]int)
|
|
for _, blob := range test.blobs {
|
|
wantBlobs[blob.ID] = 1
|
|
}
|
|
|
|
loadCalls = 0
|
|
err = repository.StreamPack(ctx, load, &key, restic.ID{}, test.blobs, handleBlob)
|
|
if err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
|
|
if !cmp.Equal(wantBlobs, gotBlobs) {
|
|
t.Fatal(cmp.Diff(wantBlobs, gotBlobs))
|
|
}
|
|
rtest.Equals(t, test.calls, loadCalls)
|
|
})
|
|
}
|
|
})
|
|
|
|
// next, test invalid uses, which should return an error
|
|
t.Run("invalid", func(t *testing.T) {
|
|
tests := []struct {
|
|
blobs []restic.Blob
|
|
err string
|
|
}{
|
|
{
|
|
// pass one blob several times
|
|
blobs: []restic.Blob{
|
|
packfileBlobs[3],
|
|
packfileBlobs[8],
|
|
packfileBlobs[3],
|
|
packfileBlobs[4],
|
|
},
|
|
err: "overlapping blobs in pack",
|
|
},
|
|
|
|
{
|
|
// pass something that's not a valid blob in the current pack file
|
|
blobs: []restic.Blob{
|
|
{
|
|
Offset: 123,
|
|
Length: 20000,
|
|
},
|
|
},
|
|
err: "ciphertext verification failed",
|
|
},
|
|
|
|
{
|
|
// pass a blob that's too small
|
|
blobs: []restic.Blob{
|
|
{
|
|
Offset: 123,
|
|
Length: 10,
|
|
},
|
|
},
|
|
err: "invalid blob length",
|
|
},
|
|
}
|
|
|
|
for _, test := range tests {
|
|
t.Run("", func(t *testing.T) {
|
|
ctx, cancel := context.WithCancel(context.Background())
|
|
defer cancel()
|
|
|
|
handleBlob := func(blob restic.BlobHandle, buf []byte, err error) error {
|
|
return err
|
|
}
|
|
|
|
err = repository.StreamPack(ctx, load, &key, restic.ID{}, test.blobs, handleBlob)
|
|
if err == nil {
|
|
t.Fatalf("wanted error %v, got nil", test.err)
|
|
}
|
|
|
|
if !strings.Contains(err.Error(), test.err) {
|
|
t.Fatalf("wrong error returned, it should contain %q but was %q", test.err, err)
|
|
}
|
|
})
|
|
}
|
|
})
|
|
}
|
|
|
|
func TestInvalidCompression(t *testing.T) {
|
|
var comp repository.CompressionMode
|
|
err := comp.Set("nope")
|
|
rtest.Assert(t, err != nil, "missing error")
|
|
_, err = repository.New(nil, repository.Options{Compression: comp})
|
|
rtest.Assert(t, err != nil, "missing error")
|
|
}
|