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Code Issues Releases Wiki Activity

Add code to debug wrong hash issue

This commit is contained in:
Alexander Neumann 2020-12-20 14:51:15 +01:00
parent b7e1ece1e0
commit 0333ef3325
1 changed files with 93 additions and 0 deletions
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93
internal/checker/checker.go
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@ -2,11 +2,14 @@ package checker
import (
"context"
cryptosha256 "crypto/sha256"
"fmt"
"io"
"os"
"sync"
simdsha256 "github.com/minio/sha256-simd"
"github.com/restic/restic/internal/debug"
"github.com/restic/restic/internal/errors"
"github.com/restic/restic/internal/pack"
@ -756,10 +759,100 @@ func checkPack(ctx context.Context, r restic.Repository, id restic.ID) error {
continue
}
// inject error for testing
// if i == 23 {
// plaintext[0] ^= 0x01
// }
hash := restic.Hash(plaintext)
if !hash.Equal(blob.ID) {
debug.Log(" Blob ID does not match, want %v, got %v", blob.ID, hash)
errs = append(errs, errors.Errorf("Blob ID does not match, want %v, got %v", blob.ID.Str(), hash.Str()))
fmt.Fprintf(os.Stderr, "pack %v: blob %v (offset %v, length %v): ID does not match\n", id.String(), i, blob.Offset, blob.Length)
fmt.Fprintf(os.Stderr, " want %v\n", blob.ID)
fmt.Fprintf(os.Stderr, " got %v\n", hash)
fmt.Fprintf(os.Stderr, " crypto/sha256 %02x\n", cryptosha256.Sum256(plaintext))
fmt.Fprintf(os.Stderr, " SIMD sha256 %02x\n", simdsha256.Sum256(plaintext))
// save the blob's plaintext to a temp file
f, err := os.OpenFile(fmt.Sprintf("/tmp/%s.plaintext", blob.ID), os.O_CREATE|os.O_WRONLY|os.O_TRUNC, 0600)
if err != nil {
panic("unable to create tempfile: " + err.Error())
}
_, err = f.Write(plaintext)
if err != nil {
panic("write error: " + err.Error())
}
err = f.Close()
if err != nil {
panic("close error: " + err.Error())
}
// save the raw buffer
f, err = os.OpenFile(fmt.Sprintf("/tmp/%s.buf", blob.ID), os.O_CREATE|os.O_WRONLY|os.O_TRUNC, 0600)
if err != nil {
panic("unable to create tempfile: " + err.Error())
}
_, err = f.Write(buf)
if err != nil {
panic("write error: " + err.Error())
}
err = f.Close()
if err != nil {
panic("close error: " + err.Error())
}
// extract the encrypted blob again
f, err = os.OpenFile(fmt.Sprintf("/tmp/%s.raw", blob.ID), os.O_CREATE|os.O_WRONLY|os.O_TRUNC, 0600)
if err != nil {
panic("unable to create tempfile: " + err.Error())
}
_, err = packfile.Seek(int64(blob.Offset), 0)
if err != nil {
panic(errors.Errorf("Seek(%v): %v", blob.Offset, err).Error())
}
_, err = io.CopyN(f, packfile, int64(blob.Length))
if err != nil {
panic("copyN error: " + err.Error())
}
err = f.Close()
if err != nil {
panic("close error: " + err.Error())
}
// save the raw pack file
f, err = os.OpenFile(fmt.Sprintf("/tmp/%s.pack", id), os.O_CREATE|os.O_WRONLY|os.O_TRUNC, 0600)
if err != nil {
panic("unable to create tempfile: " + err.Error())
}
_, err = packfile.Seek(0, 0)
if err != nil {
panic(errors.Errorf("Seek(%v): %v", 0, err).Error())
}
_, err = io.Copy(f, packfile)
if err != nil {
panic("copyN error: " + err.Error())
}
if err == io.EOF {
err = nil
}
err = f.Close()
if err != nil {
panic("close error: " + err.Error())
}
continue
}
}