nixpkgs/nixos/lib/eval-config.nix

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# From an end-user configuration file (`configuration'), build a NixOS
# configuration object (`config') from which we can retrieve option
# values.
{ system ? builtins.currentSystem
, pkgs ? null
, baseModules ? import ../modules/module-list.nix
, extraArgs ? {}
, modules
, check ? true
, prefix ? []
, lib ? import ../../lib
}:
let extraArgs_ = extraArgs; pkgs_ = pkgs; system_ = system;
extraModules = let e = builtins.getEnv "NIXOS_EXTRA_MODULE_PATH";
in if e == "" then [] else [(import (builtins.toPath e))];
in
let
pkgsModule = rec {
_file = ./eval-config.nix;
key = _file;
config = {
nixpkgs.system = lib.mkDefault system_;
};
};
in rec {
# Merge the option definitions in all modules, forming the full
# system configuration.
inherit (lib.evalModules {
inherit prefix;
modules = modules ++ extraModules ++ baseModules ++ [ pkgsModule ];
args = extraArgs;
check = check && options.environment.checkConfigurationOptions.value;
}) config options;
# These are the extra arguments passed to every module. In
# particular, Nixpkgs is passed through the "pkgs" argument.
# FIXME: we enable config.allowUnfree to make packages like
# nvidia-x11 available. This isn't a problem because if the user has
# nixpkgs.config.allowUnfree = false, then evaluation will fail on
# the 64-bit package anyway. However, it would be cleaner to respect
# nixpkgs.config here.
extraArgs = extraArgs_ // {
inherit pkgs modules baseModules;
modulesPath = ../modules;
pkgs_i686 = import ./nixpkgs.nix { system = "i686-linux"; config.allowUnfree = true; };
utils = import ./utils.nix pkgs;
};
pkgs =
if pkgs_ != null
then pkgs_
else import ./nixpkgs.nix (
let
system = if nixpkgsOptions.system != "" then nixpkgsOptions.system else system_;
nixpkgsOptions = config.nixpkgs;
in
{
inherit system;
inherit (nixpkgsOptions) config;
});
}