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restic/internal/repository/repair_index.go
2024-08-17 00:18:13 +05:30

139 lines
3.6 KiB
Go

package repository
import (
"context"
"github.com/restic/restic/internal/repository/index"
"github.com/restic/restic/internal/repository/pack"
"github.com/restic/restic/internal/restic"
"github.com/restic/restic/internal/ui/progress"
)
type RepairIndexOptions struct {
ReadAllPacks bool
}
func RepairIndex(ctx context.Context, repo *Repository, opts RepairIndexOptions, printer progress.Printer) error {
var obsoleteIndexes restic.IDs
packSizeFromList := make(map[restic.ID]int64)
packSizeFromIndex := make(map[restic.ID]int64)
removePacks := restic.NewIDSet()
if opts.ReadAllPacks {
// get list of old index files but start with empty index
err := repo.List(ctx, restic.IndexFile, func(id restic.ID, _ int64) error {
obsoleteIndexes = append(obsoleteIndexes, id)
return nil
})
if err != nil {
return err
}
repo.clearIndex()
} else {
printer.P("loading indexes...\n")
mi := index.NewMasterIndex()
err := index.ForAllIndexes(ctx, repo, repo, func(id restic.ID, idx *index.Index, _ bool, err error) error {
if err != nil {
printer.E("removing invalid index %v: %v\n", id, err)
obsoleteIndexes = append(obsoleteIndexes, id)
return nil
}
mi.Insert(idx)
return nil
})
if err != nil {
return err
}
err = mi.MergeFinalIndexes()
if err != nil {
return err
}
err = repo.SetIndex(mi)
if err != nil {
return err
}
packSizeFromIndex, err = pack.Size(ctx, repo, false)
if err != nil {
return err
}
}
oldIndexes := repo.idx.IDs()
printer.P("getting pack files to read...\n")
err := repo.List(ctx, restic.PackFile, func(id restic.ID, packSize int64) error {
size, ok := packSizeFromIndex[id]
if !ok || size != packSize {
// Pack was not referenced in index or size does not match
packSizeFromList[id] = packSize
removePacks.Insert(id)
}
if !ok {
printer.E("adding pack file to index %v\n", id)
} else if size != packSize {
printer.E("reindexing pack file %v with unexpected size %v instead of %v\n", id, packSize, size)
}
delete(packSizeFromIndex, id)
return nil
})
if err != nil {
return err
}
for id := range packSizeFromIndex {
// forget pack files that are referenced in the index but do not exist
// when rebuilding the index
removePacks.Insert(id)
printer.E("removing not found pack file %v\n", id)
}
if len(packSizeFromList) > 0 {
printer.P("reading pack files\n")
bar := printer.NewCounter("packs")
bar.SetMax(uint64(len(packSizeFromList)))
invalidFiles, err := repo.createIndexFromPacks(ctx, packSizeFromList, bar)
bar.Done()
if err != nil {
return err
}
for _, id := range invalidFiles {
printer.V("skipped incomplete pack file: %v\n", id)
}
}
if err := repo.Flush(ctx); err != nil {
return err
}
err = rewriteIndexFiles(ctx, repo, removePacks, oldIndexes, obsoleteIndexes, printer)
if err != nil {
return err
}
// drop outdated in-memory index
repo.clearIndex()
return nil
}
func rewriteIndexFiles(ctx context.Context, repo *Repository, removePacks restic.IDSet, oldIndexes restic.IDSet, extraObsolete restic.IDs, printer progress.Printer) error {
printer.P("rebuilding index\n")
bar := printer.NewCounter("indexes processed")
return repo.idx.Rewrite(ctx, repo, removePacks, oldIndexes, extraObsolete, index.MasterIndexRewriteOpts{
SaveProgress: bar,
DeleteProgress: func() *progress.Counter {
return printer.NewCounter("old indexes deleted")
},
DeleteReport: func(id restic.ID, err error) {
if err != nil {
printer.VV("failed to remove index %v: %v\n", id.String(), err)
} else {
printer.VV("removed index %v\n", id.String())
}
},
})
}