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creation of car from file / directory (#246)
* creation of car from file / directory Co-authored-by: Daniel Martí <mvdan@mvdan.cc> Co-authored-by: Rod Vagg <rod@vagg.org>
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Oct 22, 2021
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,120 @@ | ||
| package main | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "context" | ||
| "fmt" | ||
| "io" | ||
| "path" | ||
|
|
||
| blocks "github.com/ipfs/go-block-format" | ||
| "github.com/ipfs/go-cid" | ||
| "github.com/ipfs/go-unixfsnode/data/builder" | ||
| "github.com/ipld/go-car/v2" | ||
| "github.com/ipld/go-car/v2/blockstore" | ||
| dagpb "github.com/ipld/go-codec-dagpb" | ||
| "github.com/ipld/go-ipld-prime" | ||
| cidlink "github.com/ipld/go-ipld-prime/linking/cid" | ||
| "github.com/multiformats/go-multicodec" | ||
| "github.com/multiformats/go-multihash" | ||
| "github.com/urfave/cli/v2" | ||
| ) | ||
|
|
||
| // CreateCar creates a car | ||
| func CreateCar(c *cli.Context) error { | ||
| var err error | ||
| if c.Args().Len() == 0 { | ||
| return fmt.Errorf("a source location to build the car from must be specified") | ||
| } | ||
|
|
||
| if !c.IsSet("file") { | ||
| return fmt.Errorf("a file destination must be specified") | ||
| } | ||
|
|
||
| // make a cid with the right length that we eventually will patch with the root. | ||
| hasher, err := multihash.GetHasher(multihash.SHA2_256) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| digest := hasher.Sum([]byte{}) | ||
| hash, err := multihash.Encode(digest, multihash.SHA2_256) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| proxyRoot := cid.NewCidV1(uint64(multicodec.DagPb), hash) | ||
|
|
||
| cdest, err := blockstore.OpenReadWrite(c.String("file"), []cid.Cid{proxyRoot}) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| // Write the unixfs blocks into the store. | ||
| root, err := writeFiles(c.Context, cdest, c.Args().Slice()...) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| if err := cdest.Finalize(); err != nil { | ||
| return err | ||
| } | ||
| // re-open/finalize with the final root. | ||
| return car.ReplaceRootsInFile(c.String("file"), []cid.Cid{root}) | ||
| } | ||
|
|
||
| func writeFiles(ctx context.Context, bs *blockstore.ReadWrite, paths ...string) (cid.Cid, error) { | ||
| ls := cidlink.DefaultLinkSystem() | ||
| ls.TrustedStorage = true | ||
| ls.StorageReadOpener = func(_ ipld.LinkContext, l ipld.Link) (io.Reader, error) { | ||
| cl, ok := l.(cidlink.Link) | ||
| if !ok { | ||
| return nil, fmt.Errorf("not a cidlink") | ||
| } | ||
| blk, err := bs.Get(cl.Cid) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| return bytes.NewBuffer(blk.RawData()), nil | ||
| } | ||
| ls.StorageWriteOpener = func(_ ipld.LinkContext) (io.Writer, ipld.BlockWriteCommitter, error) { | ||
| buf := bytes.NewBuffer(nil) | ||
| return buf, func(l ipld.Link) error { | ||
| cl, ok := l.(cidlink.Link) | ||
| if !ok { | ||
| return fmt.Errorf("not a cidlink") | ||
| } | ||
| blk, err := blocks.NewBlockWithCid(buf.Bytes(), cl.Cid) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| bs.Put(blk) | ||
| return nil | ||
| }, nil | ||
| } | ||
|
|
||
| topLevel := make([]dagpb.PBLink, 0, len(paths)) | ||
| for _, p := range paths { | ||
| l, size, err := builder.BuildUnixFSRecursive(p, &ls) | ||
| if err != nil { | ||
| return cid.Undef, err | ||
| } | ||
| name := path.Base(p) | ||
| entry, err := builder.BuildUnixFSDirectoryEntry(name, int64(size), l) | ||
| if err != nil { | ||
| return cid.Undef, err | ||
| } | ||
| topLevel = append(topLevel, entry) | ||
| } | ||
|
|
||
| // make a directory for the file(s). | ||
|
|
||
| root, err := builder.BuildUnixFSDirectory(topLevel, &ls) | ||
| if err != nil { | ||
| return cid.Undef, nil | ||
| } | ||
| rcl, ok := root.(cidlink.Link) | ||
| if !ok { | ||
| return cid.Undef, fmt.Errorf("could not interpret %s", root) | ||
| } | ||
|
|
||
| return rcl.Cid, nil | ||
| } |
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