forked from TrueCloudLab/restic
Add code to debug wrong hash issue
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1 changed files with 93 additions and 0 deletions
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@ -2,11 +2,14 @@ package checker
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import (
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"context"
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cryptosha256 "crypto/sha256"
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"fmt"
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"io"
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"os"
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"sync"
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simdsha256 "github.com/minio/sha256-simd"
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"github.com/restic/restic/internal/debug"
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"github.com/restic/restic/internal/errors"
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"github.com/restic/restic/internal/pack"
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@ -756,10 +759,100 @@ func checkPack(ctx context.Context, r restic.Repository, id restic.ID) error {
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continue
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}
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// inject error for testing
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// if i == 23 {
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// plaintext[0] ^= 0x01
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// }
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hash := restic.Hash(plaintext)
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if !hash.Equal(blob.ID) {
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debug.Log(" Blob ID does not match, want %v, got %v", blob.ID, hash)
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errs = append(errs, errors.Errorf("Blob ID does not match, want %v, got %v", blob.ID.Str(), hash.Str()))
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fmt.Fprintf(os.Stderr, "pack %v: blob %v (offset %v, length %v): ID does not match\n", id.String(), i, blob.Offset, blob.Length)
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fmt.Fprintf(os.Stderr, " want %v\n", blob.ID)
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fmt.Fprintf(os.Stderr, " got %v\n", hash)
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fmt.Fprintf(os.Stderr, " crypto/sha256 %02x\n", cryptosha256.Sum256(plaintext))
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fmt.Fprintf(os.Stderr, " SIMD sha256 %02x\n", simdsha256.Sum256(plaintext))
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// save the blob's plaintext to a temp file
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f, err := os.OpenFile(fmt.Sprintf("/tmp/%s.plaintext", blob.ID), os.O_CREATE|os.O_WRONLY|os.O_TRUNC, 0600)
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if err != nil {
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panic("unable to create tempfile: " + err.Error())
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}
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_, err = f.Write(plaintext)
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if err != nil {
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panic("write error: " + err.Error())
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}
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err = f.Close()
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if err != nil {
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panic("close error: " + err.Error())
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}
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// save the raw buffer
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f, err = os.OpenFile(fmt.Sprintf("/tmp/%s.buf", blob.ID), os.O_CREATE|os.O_WRONLY|os.O_TRUNC, 0600)
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if err != nil {
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panic("unable to create tempfile: " + err.Error())
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}
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_, err = f.Write(buf)
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if err != nil {
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panic("write error: " + err.Error())
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}
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err = f.Close()
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if err != nil {
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panic("close error: " + err.Error())
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}
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// extract the encrypted blob again
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f, err = os.OpenFile(fmt.Sprintf("/tmp/%s.raw", blob.ID), os.O_CREATE|os.O_WRONLY|os.O_TRUNC, 0600)
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if err != nil {
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panic("unable to create tempfile: " + err.Error())
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}
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_, err = packfile.Seek(int64(blob.Offset), 0)
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if err != nil {
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panic(errors.Errorf("Seek(%v): %v", blob.Offset, err).Error())
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}
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_, err = io.CopyN(f, packfile, int64(blob.Length))
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if err != nil {
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panic("copyN error: " + err.Error())
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}
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err = f.Close()
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if err != nil {
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panic("close error: " + err.Error())
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}
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// save the raw pack file
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f, err = os.OpenFile(fmt.Sprintf("/tmp/%s.pack", id), os.O_CREATE|os.O_WRONLY|os.O_TRUNC, 0600)
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if err != nil {
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panic("unable to create tempfile: " + err.Error())
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}
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_, err = packfile.Seek(0, 0)
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if err != nil {
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panic(errors.Errorf("Seek(%v): %v", 0, err).Error())
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}
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_, err = io.Copy(f, packfile)
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if err != nil {
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panic("copyN error: " + err.Error())
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}
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if err == io.EOF {
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err = nil
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}
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err = f.Close()
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if err != nil {
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panic("close error: " + err.Error())
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}
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continue
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}
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}
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