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index: remove support for legacy index format

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This commit is contained in:
Michael Eischer
2024-08-26 20:07:21 +02:00
parent a5533344f9
commit 943b6ccfba
12 changed files with 28 additions and 168 deletions
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57
internal/repository/index/index.go
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@@ -4,7 +4,6 @@ import (
"bytes"
"context"
"encoding/json"
"fmt"
"io"
"math"
"sync"
@@ -12,7 +11,6 @@ import (
"github.com/restic/restic/internal/crypto"
"github.com/restic/restic/internal/errors"
"github.com/restic/restic/internal/feature"
"github.com/restic/restic/internal/restic"
"github.com/restic/restic/internal/debug"
@@ -489,34 +487,15 @@ func (idx *Index) merge(idx2 *Index) error {
return nil
}
// isErrOldIndex returns true if the error may be caused by an old index
// format.
func isErrOldIndex(err error) bool {
e, ok := err.(*json.UnmarshalTypeError)
return ok && e.Value == "array"
}
// DecodeIndex unserializes an index from buf.
func DecodeIndex(buf []byte, id restic.ID) (idx *Index, oldFormat bool, err error) {
func DecodeIndex(buf []byte, id restic.ID) (idx *Index, err error) {
debug.Log("Start decoding index")
idxJSON := &jsonIndex{}
err = json.Unmarshal(buf, idxJSON)
if err != nil {
debug.Log("Error %v", err)
if isErrOldIndex(err) {
if feature.Flag.Enabled(feature.DeprecateLegacyIndex) {
return nil, false, fmt.Errorf("index seems to use the legacy format. update it using `restic repair index`")
}
debug.Log("index is probably old format, trying that")
idx, err = decodeOldIndex(buf)
idx.ids = append(idx.ids, id)
return idx, err == nil, err
}
return nil, false, errors.Wrap(err, "DecodeIndex")
return nil, errors.Wrap(err, "DecodeIndex")
}
idx = NewIndex()
@@ -537,38 +516,6 @@ func DecodeIndex(buf []byte, id restic.ID) (idx *Index, oldFormat bool, err erro
idx.ids = append(idx.ids, id)
idx.final = true
debug.Log("done")
return idx, false, nil
}
// DecodeOldIndex loads and unserializes an index in the old format from rd.
func decodeOldIndex(buf []byte) (idx *Index, err error) {
debug.Log("Start decoding old index")
list := []*packJSON{}
err = json.Unmarshal(buf, &list)
if err != nil {
debug.Log("Error %#v", err)
return nil, errors.Wrap(err, "Decode")
}
idx = NewIndex()
for _, pack := range list {
packID := idx.addToPacks(pack.ID)
for _, blob := range pack.Blobs {
idx.store(packID, restic.Blob{
BlobHandle: restic.BlobHandle{
Type: blob.Type,
ID: blob.ID},
Offset: blob.Offset,
Length: blob.Length,
// no compressed length in the old index format
})
}
}
idx.final = true
debug.Log("done")
return idx, nil
}