00-bad.nix

pkgs: self: super:
let
  foo = ../../consumer-data-au-api-client;
  upstreamOverrides = {
    consumer-data-au-api-types = import ../../consumer-data-au-api-types/nix/consumer-data-au-api-types-overrides.nix;
    consumer-data-au-api-client = import "${foo}/nix/consumer-data-au-api-client-overrides.nix";
  };

  bankOverrides = pkgs: self: super: {
    consumer-data-au-api-types = self.callPackage (import ../../consumer-data-au-api-types/consumer-data-au-api-types.nix) {};
    consumer-data-au-api-client = self.callPackage (import ../../consumer-data-au-api-client/consumer-data-au-api-client.nix) {};
  };

  composedOverrides =
    pkgs.lib.foldr
      (x: acc: pkgs.lib.composeExtensions acc (x pkgs))
      (_: _: {})
      (builtins.attrValues upstreamOverrides ++ [bankOverrides]);
in
  composedOverrides self super

01-works.nix

pkgs: self: super:
let
  upstreamOverrides = {
    consumer-data-au-api-types = import ../../consumer-data-au-api-types/nix/consumer-data-au-api-types-overrides.nix;
    consumer-data-au-api-client = import ../../consumer-data-au-api-client/nix/consumer-data-au-api-client-overrides.nix;
  };

  bankOverrides = pkgs: self: super: {
    consumer-data-au-api-types = self.callPackage (import ../../consumer-data-au-api-types/consumer-data-au-api-types.nix) {};
    consumer-data-au-api-client = self.callPackage (import ../../consumer-data-au-api-client/consumer-data-au-api-client.nix) {};
  };

  composedOverrides =
    pkgs.lib.foldr
      (x: acc: pkgs.lib.composeExtensions acc (x pkgs))
      (_: _: {})
      (builtins.attrValues upstreamOverrides ++ [bankOverrides]);
in
  composedOverrides self super

02.notes.md

bkolera at bkolera in ~/src/github/ConsumerDataStandardsAustralia/conformance/consumer-data-au-lambdabank (feature/client●) 
$ nix-shell                                        
error: getting status of '/nix/store/consumer-data-au-api-types/nix/consumer-data-au-api-types-overrides.nix': No such file or directory

This happens because for some reason the non string path is interpreted locally for some reason the string interpolated one gets done in terms of the nix store? Weird.

The override that it is loading looks like the following file. It has a relative path in it.

It's note worthy that if I try to make a string called "../../consumer-data-au-api-client/..." nix yells at me for having a string path that isn't absolute. So there is some magic at play.

03-clientoverrides.nix

pkgs: self: super:
let
  srcs = {
  };

  upstreamOverrides = {
    consumer-data-au-api-types = import ../../consumer-data-au-api-types/nix/consumer-data-au-api-types-overrides.nix;
  };

  clientOverrides = pkgs: (self: super: {
    consumer-data-au-api-types = self.callPackage (import ../../consumer-data-au-api-types/consumer-data-au-api-types.nix) {};
  });

  composedOverrides =
    pkgs.lib.foldr
      (x: acc: pkgs.lib.composeExtensions acc (x pkgs))
      (_: _: {})
      (builtins.attrValues upstreamOverrides ++ [clientOverrides]);
in
  composedOverrides self super