dynix/tests/mk-test-configuration-dot-nix.nix

{
  lib,
  stdenvNoCC,
}: let
  stdenv = stdenvNoCC;

  mkDynixConfigurationDotNix = finalAttrs: {
    name,
    /** A *path* to a `configuration.nix`-like NixOS module.
     * NOT a NixOS module *value*.
     */
    configuration,
  }: assert lib.isStringLike configuration; let
    self = finalAttrs.finalPackage;
  in {
    name = "configuration-dot-nix-for-${name}";
    strictDeps = true;
    __structuredAttrs = true;
    preferLocalBuild = true;

    phases = [ "installPhase" ];

    outputs = [ "out" ];
    modulesOut = "${placeholder "out"}/share/nixos";

    baseConfiguration = configuration;
    dynixVmConfiguration = ./dynix-vm-configuration.nix;

    installPhase = ''
      runHook preInstall

      install -Dm a=r "$baseConfiguration" "$modulesOut/test-configuration.nix"
      install -Dm a=r "$dynixVmConfiguration" "$modulesOut/dynix-vm-configuration.nix"

      echo "/** GENERATED BY mk-test-configuration-dot-nix! */" >> "$modulesOut/configuration.nix"
      echo "{ ... }:" >> "$modulesOut/configuration.nix"
      echo >> "$modulesOut/configuration.nix"
      echo >> "$modulesOut/configuration.nix"
      echo "{" >> "$modulesOut/configuration.nix"
      echo "  imports = [" >> "$modulesOut/configuration.nix"
      echo "    ./test-configuration.nix" >> "$modulesOut/configuration.nix"
      echo "    ./dynix-vm-configuration.nix" >> "$modulesOut/configuration.nix"
      echo "    ./hardware-configuration.nix" >> "$modulesOut/configuration.nix"
      echo "  ];" >> "$modulesOut/configuration.nix"
      echo "}" >> "$modulesOut/configuration.nix"

      runHook postInstall
    '';

    passthru = {
      modulesPath = self.out + "/share/nixos";
      configuration = self.out + "/share/nixos/configuration.nix";
    };
  };
in lib.extendMkDerivation {
  constructDrv = stdenv.mkDerivation;
  extendDrvArgs = mkDynixConfigurationDotNix;
}