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nixos: Don't evaluate twice to get the value of config.nixpkgs

This commit is contained in:
Shea Levy 2014-05-05 15:52:33 -04:00 committed by Nicolas B. Pierron
parent 1d62ad4746
commit e4a06f35b1
4 changed files with 18 additions and 27 deletions

View file

@ -12,10 +12,10 @@ rec {
and config: the nested set of all option values. */
evalModules = { modules, prefix ? [], args ? {}, check ? true }:
let
internalModule = {
internalModule = rec {
_file = ./modules.nix;
key = ./modules.nix;
key = _file;
options = {
__internal.args = mkOption {

View file

@ -9,18 +9,30 @@
, 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 (pkgs.lib.evalModules {
inherit (lib.evalModules {
inherit prefix;
modules = modules ++ extraModules ++ baseModules;
modules = modules ++ extraModules ++ baseModules ++ [ pkgsModule ];
args = extraArgs;
check = check && options.environment.checkConfigurationOptions.value;
}) config options;
@ -39,30 +51,13 @@ in rec {
utils = import ./utils.nix pkgs;
};
# Import Nixpkgs, allowing the NixOS option nixpkgs.config to
# specify the Nixpkgs configuration (e.g., to set package options
# such as firefox.enableGeckoMediaPlayer, or to apply global
# overrides such as changing GCC throughout the system), and the
# option nixpkgs.system to override the platform type. This is
# tricky, because we have to prevent an infinite recursion: "pkgs"
# is passed as an argument to NixOS modules, but the value of "pkgs"
# depends on config.nixpkgs.config, which we get from the modules.
# So we call ourselves here with "pkgs" explicitly set to an
# instance that doesn't depend on nixpkgs.config.
pkgs =
if pkgs_ != null
then pkgs_
else import ./nixpkgs.nix (
let
system = if nixpkgsOptions.system != "" then nixpkgsOptions.system else system_;
nixpkgsOptions = (import ./eval-config.nix {
inherit system extraArgs modules prefix;
# For efficiency, leave out most NixOS modules; they don't
# define nixpkgs.config, so it's pointless to evaluate them.
baseModules = [ ../modules/misc/nixpkgs.nix ../modules/config/no-x-libs.nix ];
pkgs = import ./nixpkgs.nix { system = system_; config = {}; };
check = false;
}).config.nixpkgs;
nixpkgsOptions = config.nixpkgs;
in
{
inherit system;

View file

@ -69,8 +69,4 @@ in
};
};
config = {
nixpkgs.system = mkDefault pkgs.stdenv.system;
};
}

View file

@ -1,7 +1,7 @@
{ config, lib, pkgs, utils, ... }:
with lib;
with utils;
with lib;
with import ./systemd-unit-options.nix { inherit config lib; };
let