{ lib, ... }:

let
  # FIXME (roberth) reference issue
  inputDerivation = pkg: (pkg.overrideAttrs (o: {
    disallowedReferences = [ ];
  })).inputDerivation;

in
{
  # We rarely change the script in a way that benefits from type checking, so
  # we skip it to save time.
  skipTypeCheck = true;

  nodes.machine = { config, pkgs, ... }: {

    virtualisation.writableStore = true;
    system.extraDependencies = [
      (inputDerivation config.nix.package)
    ];

    nix.settings.substituters = lib.mkForce [];

    environment.systemPackages = let
      run-test-suite = pkgs.writeShellApplication {
        name = "run-test-suite";
        runtimeInputs = [
          pkgs.meson
          pkgs.ninja
          pkgs.jq
          pkgs.git

          # Want to avoid `/run/current-system/sw/bin/bash` because we
          # want a store path. Likewise for coreutils.
          pkgs.bash
          pkgs.coreutils
        ];
        text = ''
          set -x

          cat /proc/sys/fs/file-max
          ulimit -Hn
          ulimit -Sn

          cd ~

          cp -r ${pkgs.nixComponents.nix-functional-tests.src} nix
          chmod -R +w nix

          chmod u+w nix/.version
          echo ${pkgs.nixComponents.version} > nix/.version

          export isTestOnNixOS=1

          export NIX_REMOTE_=daemon
          export NIX_REMOTE=daemon

          export NIX_STORE=${builtins.storeDir}

          meson setup nix/tests/functional build
          cd build
          meson test -j1 --print-errorlogs
        '';
      };
    in [
      run-test-suite
      pkgs.git
    ];
  };
}