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Add 'debug examine' command to debug #1999
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parent
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commit
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1 changed files with 177 additions and 0 deletions
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@ -7,6 +7,8 @@ import (
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"encoding/json"
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"fmt"
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"io"
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"os"
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"sort"
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"github.com/spf13/cobra"
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@ -42,6 +44,7 @@ Exit status is 0 if the command was successful, and non-zero if there was any er
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func init() {
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cmdRoot.AddCommand(cmdDebug)
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cmdDebug.AddCommand(cmdDebugDump)
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cmdDebug.AddCommand(cmdDebugExamine)
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}
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func prettyPrintJSON(wr io.Writer, item interface{}) error {
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@ -165,3 +168,177 @@ func runDebugDump(gopts GlobalOptions, args []string) error {
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return errors.Fatalf("no such type %q", tpe)
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}
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}
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var cmdDebugExamine = &cobra.Command{
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Use: "examine",
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Short: "Examine a pack file",
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DisableAutoGenTag: true,
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RunE: func(cmd *cobra.Command, args []string) error {
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return runDebugExamine(globalOptions, args)
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},
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}
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func loadBlobs(ctx context.Context, repo restic.Repository, pack string, list []restic.PackedBlob) error {
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be := repo.Backend()
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for _, blob := range list {
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fmt.Printf(" loading blob %v at %v (length %v)\n", blob.ID, blob.Offset, blob.Length)
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buf := make([]byte, blob.Length)
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h := restic.Handle{
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Name: pack,
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Type: restic.PackFile,
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}
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err := be.Load(ctx, h, int(blob.Length), int64(blob.Offset), func(rd io.Reader) error {
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n, err := io.ReadFull(rd, buf)
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if err != nil {
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fmt.Fprintf(os.Stderr, "read error after %d bytes: %v\n", n, err)
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return err
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}
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return nil
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})
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if err != nil {
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fmt.Fprintf(os.Stderr, "error read: %v\n", err)
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continue
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}
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key := repo.Key()
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nonce, buf := buf[:key.NonceSize()], buf[key.NonceSize():]
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buf, err = key.Open(buf[:0], nonce, buf, nil)
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if err != nil {
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fmt.Fprintf(os.Stderr, "error decrypting blob: %v\n", err)
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continue
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}
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id := restic.Hash(buf)
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fmt.Printf(" successfully decrypted blob (length %v), hash is %v\n", len(buf), id)
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if !id.Equal(blob.ID) {
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fmt.Printf(" IDs do not match, want %v, got %v\n", blob.ID, id)
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} else {
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fmt.Printf(" IDs match\n")
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}
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}
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return nil
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}
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func runDebugExamine(gopts GlobalOptions, args []string) error {
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repo, err := OpenRepository(gopts)
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if err != nil {
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return err
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}
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if !gopts.NoLock {
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lock, err := lockRepo(gopts.ctx, repo)
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defer unlockRepo(lock)
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if err != nil {
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return err
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}
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}
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err = repo.LoadIndex(gopts.ctx)
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if err != nil {
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return err
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}
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for _, name := range args {
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fmt.Printf("examine %v\n", name)
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id, err := restic.ParseID(name)
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if err != nil {
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fmt.Fprintf(os.Stderr, "error: %v\n", err)
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}
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h := restic.Handle{
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Type: restic.PackFile,
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Name: name,
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}
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fi, err := repo.Backend().Stat(gopts.ctx, h)
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if err != nil {
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fmt.Fprintf(os.Stderr, "error: %v\n", err)
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}
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fmt.Printf(" file size is %v\n", fi.Size)
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// examine all data the indexes have for the pack file
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for _, idx := range repo.Index().(*repository.MasterIndex).All() {
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idxIDs, err := idx.IDs()
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if err != nil {
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idxIDs = restic.IDs{}
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}
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blobs := idx.ListPack(id)
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if len(blobs) == 0 {
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fmt.Printf(" index %v does not contain the file\n", idxIDs)
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continue
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}
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fmt.Printf(" index %v:\n", idxIDs)
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// track current size and offset
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var size, offset uint64
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sort.Slice(blobs, func(i, j int) bool {
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return blobs[i].Offset < blobs[j].Offset
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})
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for _, pb := range blobs {
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fmt.Printf(" %v blob %v, offset %-6d, raw length %-6d\n", pb.Type, pb.ID, pb.Offset, pb.Length)
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if offset != uint64(pb.Offset) {
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fmt.Printf(" hole in file, want offset %v, got %v\n", offset, pb.Offset)
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}
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offset += uint64(pb.Length)
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size += uint64(pb.Length)
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}
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// compute header size, per blob: 1 byte type, 4 byte length, 32 byte id
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size += uint64(restic.CiphertextLength(len(blobs) * (1 + 4 + 32)))
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// length in uint32 little endian
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size += 4
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if uint64(fi.Size) != size {
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fmt.Printf(" file sizes do not match: computed %v from index, file size is %v\n", size, fi.Size)
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} else {
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fmt.Printf(" file sizes match\n")
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}
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err = loadBlobs(gopts.ctx, repo, name, blobs)
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if err != nil {
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fmt.Fprintf(os.Stderr, "error: %v\n", err)
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}
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}
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// inspect the pack file itself
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blobs, _, err := pack.List(repo.Key(), restic.ReaderAt(gopts.ctx, repo.Backend(), h), fi.Size)
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if err != nil {
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fmt.Fprintf(os.Stderr, "error for pack %v: %v\n", id.Str(), err)
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return nil
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}
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// track current size and offset
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var size, offset uint64
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sort.Slice(blobs, func(i, j int) bool {
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return blobs[i].Offset < blobs[j].Offset
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})
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for _, pb := range blobs {
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fmt.Printf(" %v blob %v, offset %-6d, raw length %-6d\n", pb.Type, pb.ID, pb.Offset, pb.Length)
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if offset != uint64(pb.Offset) {
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fmt.Printf(" hole in file, want offset %v, got %v\n", offset, pb.Offset)
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}
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offset += uint64(pb.Length)
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size += uint64(pb.Length)
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}
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// compute header size, per blob: 1 byte type, 4 byte length, 32 byte id
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size += uint64(restic.CiphertextLength(len(blobs) * (1 + 4 + 32)))
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// length in uint32 little endian
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size += 4
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if uint64(fi.Size) != size {
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fmt.Printf(" file sizes do not match: computed %v from index, file size is %v\n", size, fi.Size)
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} else {
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fmt.Printf(" file sizes match\n")
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}
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}
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return nil
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}
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