[Nix-dev] Question about dockerTools layering

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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