it might work, idk yet

README.md

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+go-car (go!)
+==================
+
+[![](https://img.shields.io/badge/made%20by-Protocol%20Labs-blue.svg?style=flat-square)](http://ipn.io)
+[![](https://img.shields.io/badge/project-IPFS-blue.svg?style=flat-square)](http://ipfs.io/)
+[![](https://img.shields.io/badge/freenode-%23ipfs-blue.svg?style=flat-square)](http://webchat.freenode.net/?channels=%23ipfs)
+[![Coverage Status](https://codecov.io/gh/ipfs/go-car/branch/master/graph/badge.svg)](https://codecov.io/gh/ipfs/go-car/branch/master)
+[![Travis CI](https://travis-ci.org/ipfs/go-car.svg?branch=master)](https://travis-ci.org/ipfs/go-car)
+
+> go-car is a simple way of packing a merkledag into a single file
+
+
+## Table of Contents
+
+- [Install](#install)
+- [Contribute](#contribute)
+- [License](#license)
+
+
+## Contribute
+
+PRs are welcome!
+
+Small note: If editing the Readme, please conform to the [standard-readme](https://github.com/RichardLitt/standard-readme) specification.
+
+## License
+
+MIT © Whyrusleeping

car.go

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+package car
+
+import (
+	"archive/tar"
+	"context"
+	"fmt"
+	"io"
+	"io/ioutil"
+
+	"github.com/ipfs/go-block-format"
+	cid "github.com/ipfs/go-cid"
+	bstore "github.com/ipfs/go-ipfs-blockstore"
+	format "github.com/ipfs/go-ipld-format"
+	dag "github.com/ipfs/go-merkledag"
+)
+
+func WriteCar(ctx context.Context, ds format.DAGService, root *cid.Cid, w io.Writer) error {
+	tw := tar.NewWriter(w)
+
+	rh := &tar.Header{
+		Typeflag: tar.TypeSymlink,
+		Name:     "root",
+		Linkname: root.String(),
+	}
+	if err := tw.WriteHeader(rh); err != nil {
+		return err
+	}
+
+	cw := &carWriter{ds: ds, tw: tw}
+
+	seen := cid.NewSet()
+	if err := dag.EnumerateChildren(ctx, cw.enumGetLinks, root, seen.Visit); err != nil {
+		return err
+	}
+
+	return tw.Flush()
+}
+
+func LoadCar(ctx context.Context, bs bstore.Blockstore, r io.Reader) (*cid.Cid, error) {
+	tr := tar.NewReader(r)
+	root, err := tr.Next()
+	if err != nil {
+		return nil, err
+	}
+
+	if root.Name != "root" || root.Typeflag != tar.TypeSymlink {
+		return nil, fmt.Errorf("expected first entry in CAR to by symlink named 'root'")
+	}
+
+	rootcid, err := cid.Decode(root.Linkname)
+	if err != nil {
+		return nil, err
+	}
+
+	for {
+		obj, err := tr.Next()
+		if err != nil {
+			if err == io.EOF {
+				break
+			}
+			return nil, err
+		}
+
+		c, err := cid.Decode(obj.Name)
+		if err != nil {
+			return nil, err
+		}
+
+		// safety 1st
+		limr := io.LimitReader(tr, 2<<20)
+		data, err := ioutil.ReadAll(limr)
+		if err != nil {
+			return nil, err
+		}
+
+		hashed, err := c.Prefix().Sum(data)
+		if err != nil {
+			return nil, err
+		}
+
+		if !hashed.Equals(c) {
+			return nil, fmt.Errorf("mismatch in content integrity, name: %s, data: %s", c, hashed)
+		}
+
+		blk, err := blocks.NewBlockWithCid(data, c)
+		if err != nil {
+			return nil, err
+		}
+
+		if err := bs.Put(blk); err != nil {
+			return nil, err
+		}
+	}
+
+	return rootcid, nil
+}
+
+type carWriter struct {
+	ds format.DAGService
+	tw *tar.Writer
+}
+
+func (cw *carWriter) enumGetLinks(ctx context.Context, c *cid.Cid) ([]*format.Link, error) {
+	nd, err := cw.ds.Get(ctx, c)
+	if err != nil {
+		return nil, err
+	}
+
+	if err := cw.writeNode(ctx, nd); err != nil {
+		return nil, err
+	}
+
+	return nd.Links(), nil
+}
+
+func (cw *carWriter) writeNode(ctx context.Context, nd format.Node) error {
+	hdr := &tar.Header{
+		Name:     nd.Cid().String(),
+		Typeflag: tar.TypeReg,
+	}
+
+	if err := cw.tw.WriteHeader(hdr); err != nil {
+		return err
+	}
+
+	if _, err := cw.tw.Write(nd.RawData()); err != nil {
+		return err
+	}
+
+	return nil
+}

package.json

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+{
+  "author": "why",
+  "bugs": {
+    "url": "https://github.com/ipfs/go-car"
+  },
+  "gx": {
+    "dvcsimport": "github.com/ipfs/go-car"
+  },
+  "gxDependencies": [
+    {
+      "author": "why",
+      "hash": "Qma2BR57Wqp8w9vPreK4dEzoXXk8DFFRL3LresMZg4QpzN",
+      "name": "go-merkledag",
+      "version": "1.0.2"
+    }
+  ],
+  "gxVersion": "0.12.1",
+  "language": "go",
+  "license": "",
+  "name": "go-car",
+  "releaseCmd": "git commit -a -m \"gx publish $VERSION\"",
+  "version": "0.0.0"
+}
+