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