[Nix-dev] docker import ignores dockerTools.buildImage config

[Tomasz Czyż]

Hi,

I'm preparing docker image using dockerTools.buildImage with

      x = pkgs.dockerTools.buildImage {name="myimage";·

        contents = [dumb-init ];

        config={

          WorkingDir = "/";

        };

     };

After the image is ready I do

docker import /nix/store/xxxxxx.tar.gz myimage
and I have the image imported but

docker inspect myimage

        "Config": {
            "Hostname": "",
            "Domainname": "",
            "User": "",
            "AttachStdin": false,
            "AttachStdout": false,
            "AttachStderr": false,
            "Tty": false,
            "OpenStdin": false,
            "StdinOnce": false,
            "Env": null,
            "Cmd": null,
            "Image": "",
            "Volumes": null,
            "WorkingDir": "",
            "Entrypoint": null,
            "OnBuild": null,
            "Labels": null
        },

inside the tar file I have the config like:

{
 "architecture": "amd64",
 "config": {
  "WorkingDir": "\/"
 },
 "created": "1970-01-01T00:00:01Z",
 "os": "linux",
 "checksum":
"tarsum.v1+sha256:41988742f842b9214b599674ccc7d3da9a0df5336276657cec1a9eabf1c297ef",
 "id": "9edfe86ac62fc829c5a122778565e3af12ce720dd64ca6547c6664e671996c63",
 "Size": 22067200
}

So as you can see, the json config is generated inside docker image, but
docker does not import that settings. Also it looks like it's escaped but
it should not be right?

Does anyone knows how to do it properly or tell how I could fix it?
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