mirror of https://github.com/restic/restic.git
136 lines
3.4 KiB
Go
136 lines
3.4 KiB
Go
package repository
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import (
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"context"
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"crypto/sha256"
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"fmt"
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"io"
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"os"
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"github.com/restic/restic/internal/debug"
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"github.com/restic/restic/internal/fs"
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"github.com/restic/restic/internal/hashing"
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"github.com/restic/restic/internal/pack"
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"github.com/restic/restic/internal/restic"
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"github.com/restic/restic/internal/errors"
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)
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// Repack takes a list of packs together with a list of blobs contained in
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// these packs. Each pack is loaded and the blobs listed in keepBlobs is saved
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// into a new pack. Returned is the list of obsolete packs which can then
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// be removed.
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func Repack(ctx context.Context, repo restic.Repository, packs restic.IDSet, keepBlobs restic.BlobSet, p *restic.Progress) (obsoletePacks restic.IDSet, err error) {
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debug.Log("repacking %d packs while keeping %d blobs", len(packs), len(keepBlobs))
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for packID := range packs {
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// load the complete pack into a temp file
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h := restic.Handle{Type: restic.DataFile, Name: packID.String()}
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tempfile, err := fs.TempFile("", "restic-temp-repack-")
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if err != nil {
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return nil, errors.Wrap(err, "TempFile")
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}
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beRd, err := repo.Backend().Load(ctx, h, 0, 0)
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if err != nil {
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return nil, err
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}
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hrd := hashing.NewReader(beRd, sha256.New())
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packLength, err := io.Copy(tempfile, hrd)
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if err != nil {
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return nil, errors.Wrap(err, "Copy")
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}
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if err = beRd.Close(); err != nil {
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return nil, errors.Wrap(err, "Close")
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}
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hash := restic.IDFromHash(hrd.Sum(nil))
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debug.Log("pack %v loaded (%d bytes), hash %v", packID.Str(), packLength, hash.Str())
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if !packID.Equal(hash) {
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return nil, errors.Errorf("hash does not match id: want %v, got %v", packID, hash)
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}
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_, err = tempfile.Seek(0, 0)
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if err != nil {
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return nil, errors.Wrap(err, "Seek")
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}
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blobs, err := pack.List(repo.Key(), tempfile, packLength)
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if err != nil {
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return nil, err
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}
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debug.Log("processing pack %v, blobs: %v", packID.Str(), len(blobs))
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var buf []byte
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for _, entry := range blobs {
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h := restic.BlobHandle{ID: entry.ID, Type: entry.Type}
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if !keepBlobs.Has(h) {
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continue
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}
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debug.Log(" process blob %v", h)
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buf = buf[:]
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if uint(len(buf)) < entry.Length {
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buf = make([]byte, entry.Length)
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}
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buf = buf[:entry.Length]
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n, err := tempfile.ReadAt(buf, int64(entry.Offset))
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if err != nil {
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return nil, errors.Wrap(err, "ReadAt")
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}
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if n != len(buf) {
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return nil, errors.Errorf("read blob %v from %v: not enough bytes read, want %v, got %v",
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h, tempfile.Name(), len(buf), n)
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}
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n, err = repo.Key().Decrypt(buf, buf)
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if err != nil {
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return nil, err
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}
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buf = buf[:n]
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id := restic.Hash(buf)
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if !id.Equal(entry.ID) {
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debug.Log("read blob %v/%v from %v: wrong data returned, hash is %v",
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h.Type, h.ID, tempfile.Name(), id)
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fmt.Fprintf(os.Stderr, "read blob %v from %v: wrong data returned, hash is %v",
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h, tempfile.Name(), id)
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}
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_, err = repo.SaveBlob(ctx, entry.Type, buf, entry.ID)
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if err != nil {
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return nil, err
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}
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debug.Log(" saved blob %v", entry.ID.Str())
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keepBlobs.Delete(h)
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}
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if err = tempfile.Close(); err != nil {
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return nil, errors.Wrap(err, "Close")
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}
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if err = fs.RemoveIfExists(tempfile.Name()); err != nil {
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return nil, errors.Wrap(err, "Remove")
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}
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if p != nil {
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p.Report(restic.Stat{Blobs: 1})
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}
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}
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if err := repo.Flush(); err != nil {
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return nil, err
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}
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return packs, nil
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}
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