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default.nix: WIP minor refactor

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This commit is contained in:
Samuel Dionne-Riel 2019-09-21 15:40:46 -04:00
parent 546dce59a8
commit 77110eaa92
1 changed files with 12 additions and 9 deletions
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21
default.nix
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@ -1,28 +1,31 @@
# This entry points allows calling `nix-build -A` with
# anything defined in the overlay (or the host system).
# Selection of the device can be made either through the environment or through
# using `--argstr device [...]`.
let deviceFromEnv = builtins.getEnv "MOBILE_NIXOS_DEVICE"; in
{
device ?
{ pkgs' ? import <nixpkgs> {}
, device ?
if deviceFromEnv == ""
then throw "Please pass a device name or set the MOBILE_NIXOS_DEVICE environment variable."
else deviceFromEnv
}:
with import <nixpkgs> {};
let
# Evaluation doesn't actually use the overlay.
# The overlay has been re-defined in the modules system.
inherit (pkgs'.lib) optional;
inherit (pkgs') path;
eval = import ./lib/eval-config.nix {
modules = [
(import (./. + "/devices/${device}" ))
]
# TODO : allow loading from elsewhere through ENV
++ lib.optional (builtins.pathExists ./local.nix) (import (./local.nix ))
++ optional (builtins.pathExists ./local.nix) (import (./local.nix ))
;
};
in
{
inherit (eval.config.system.build) all;
inherit (eval) config;
inherit (eval) config pkgs;
inherit (eval.pkgs) lib;
inherit eval;
# Shortcut to allow building `nixos` from the same channel revision.
# This is used by `./nixos/default.nix`