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5f7b48e65f
Rewrite implements a streaming rewrite of the index that excludes the given packs. For this it loads all index files from the repository and only modifies those that require changes. This will reduce the index churn when running prune. Rewrite does not require the in-memory index and thus can drop it to significantly reduce the memory usage. However, `prune --unsafe-recovery` cannot use this strategy and requires a separate method to save the whole in-memory index. This is now handled using SaveFallback.
72 lines
1.8 KiB
Go
72 lines
1.8 KiB
Go
package repository
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import (
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"context"
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"errors"
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"io"
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"github.com/restic/restic/internal/restic"
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"github.com/restic/restic/internal/ui/progress"
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"golang.org/x/sync/errgroup"
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)
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func RepairPacks(ctx context.Context, repo *Repository, ids restic.IDSet, printer progress.Printer) error {
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wg, wgCtx := errgroup.WithContext(ctx)
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repo.StartPackUploader(wgCtx, wg)
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printer.P("salvaging intact data from specified pack files")
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bar := printer.NewCounter("pack files")
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bar.SetMax(uint64(len(ids)))
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defer bar.Done()
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wg.Go(func() error {
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// examine all data the indexes have for the pack file
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for b := range repo.ListPacksFromIndex(wgCtx, ids) {
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blobs := b.Blobs
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if len(blobs) == 0 {
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printer.E("no blobs found for pack %v", b.PackID)
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bar.Add(1)
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continue
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}
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err := repo.LoadBlobsFromPack(wgCtx, b.PackID, blobs, func(blob restic.BlobHandle, buf []byte, err error) error {
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if err != nil {
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printer.E("failed to load blob %v: %v", blob.ID, err)
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return nil
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}
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id, _, _, err := repo.SaveBlob(wgCtx, blob.Type, buf, restic.ID{}, true)
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if !id.Equal(blob.ID) {
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panic("pack id mismatch during upload")
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}
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return err
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})
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// ignore truncated file parts
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if err != nil && !errors.Is(err, io.ErrUnexpectedEOF) {
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return err
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}
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bar.Add(1)
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}
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return repo.Flush(wgCtx)
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})
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err := wg.Wait()
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bar.Done()
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if err != nil {
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return err
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}
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// remove salvaged packs from index
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err = rewriteIndexFiles(ctx, repo, ids, nil, nil, printer)
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if err != nil {
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return err
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}
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// cleanup
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printer.P("removing salvaged pack files")
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// if we fail to delete the damaged pack files, then prune will remove them later on
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bar = printer.NewCounter("files deleted")
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_ = restic.ParallelRemove(ctx, repo, ids, restic.PackFile, nil, bar)
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bar.Done()
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return nil
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}
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