package main import ( "fmt" "io" "os" "github.com/ipfs/go-blockservice" "github.com/ipfs/go-cid" offline "github.com/ipfs/go-ipfs-exchange-offline" format "github.com/ipfs/go-ipld-format" "github.com/ipfs/go-merkledag" "github.com/ipld/go-car" "github.com/urfave/cli/v2" "golang.org/x/xerrors" lcli "github.com/filecoin-project/lotus/cli" "github.com/filecoin-project/lotus/node/repo" ) func carWalkFunc(nd format.Node) (out []*format.Link, err error) { for _, link := range nd.Links() { if link.Cid.Prefix().Codec == cid.FilCommitmentSealed || link.Cid.Prefix().Codec == cid.FilCommitmentUnsealed { continue } out = append(out, link) } return out, nil } var exportCarCmd = &cli.Command{ Name: "export-car", Description: "Export a car from repo (requires node to be offline)", Flags: []cli.Flag{ &cli.StringFlag{ Name: "repo", Value: "~/.lotus", }, }, Action: func(cctx *cli.Context) error { if cctx.Args().Len() != 2 { return lcli.ShowHelp(cctx, fmt.Errorf("must specify file name and object")) } outfile := cctx.Args().First() var roots []cid.Cid for _, arg := range cctx.Args().Tail() { c, err := cid.Decode(arg) if err != nil { return err } roots = append(roots, c) } ctx := lcli.ReqContext(cctx) r, err := repo.NewFS(cctx.String("repo")) if err != nil { return xerrors.Errorf("opening fs repo: %w", err) } exists, err := r.Exists() if err != nil { return err } if !exists { return xerrors.Errorf("lotus repo doesn't exist") } lr, err := r.Lock(repo.FullNode) if err != nil { return err } defer lr.Close() //nolint:errcheck fi, err := os.Create(outfile) if err != nil { return xerrors.Errorf("opening the output file: %w", err) } defer fi.Close() //nolint:errcheck bs, err := lr.Blockstore(ctx, repo.UniversalBlockstore) if err != nil { return fmt.Errorf("failed to open blockstore: %w", err) } defer func() { if c, ok := bs.(io.Closer); ok { if err := c.Close(); err != nil { log.Warnf("failed to close blockstore: %s", err) } } }() dag := merkledag.NewDAGService(blockservice.New(bs, offline.Exchange(bs))) err = car.WriteCarWithWalker(ctx, dag, roots, fi, carWalkFunc) if err != nil { return err } return nil }, }