[Nix-dev] Question about dockerTools layering

[Luca Bruno]

Yes, you can create an image with only node_modules and then layer on top
of it another image with fromImage.

You can make the node_modules symlink in the base image. Then only update
assets in the upper image.

On Fri, Sep 23, 2016 at 8:38 PM, Tobias Pflug <Tobias.Pflug at gmx.net> wrote:

> Hi,
>
> I recently started using dockerTools.buildImage for a nodejs based
> project. It's working
> fine but I am hitting a mental block trying to introduce layers - I don't
> want to always push
> around node_modules.
>
> My current setup is something like the following:
>
> # default.nix
> dockerImage = with pkgs; dockerTools.buildImage {
>   name = "foo";
>   contents = [ nodejsApp ];
>   config = {
>     Cmd = [ "${nodejs-6_x}/bin/node" "${nodejsApp}/index.js" ];
>     WorkingDir = "${nodejsApp}"
>   };
> };
>
> # nodejsApp.nix
> stdenv.mkDerivation {
>   name = "nodejsApp";
>   src = ...
>   buildInputs = [ assets nodeModules ];
>   installPhase = ''
>     mkdir -p $out
>     ln -s ${nodeModules}/node_modules $out/node_modules
>     ln -s ${assets} $out/assets
>     ...
>   '';
> }
>
> So basically I have a derivation for my app and I symlink in the
> node_modules. Now if I want to avoid pushing
> the node_modules to my docker registry if they are unchanged I would have
> to create a docker image that contains
> only the node_modules and specify that docker image as `fromImage`
> argument in my buildImage call I assume?
>
> I'm just not quite sure to make it all fit together. Maybe someone could
> help me out a bit?
> Thanks in advance!
>
> best regards,
> Tobi
>
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>


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