nixpkgs/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.
{ configuration
, system ? builtins.currentSystem
, nixpkgs ? import ./from-env.nix "NIXPKGS" /etc/nixos/nixpkgs
, pkgs ? import nixpkgs {inherit system;}
}:
rec {
inherit nixpkgs pkgs;
configComponents = [
configuration
./check-config.nix
] ++ (import ../modules/module-list.nix);
extraArgs = {
inherit pkgs;
modulesPath = ../modules;
};
config_ =
pkgs.lib.definitionsOf configComponents extraArgs;
# "fixableDeclarationsOf" is used instead of "declarationsOf" because some
# option default values may depends on the definition of other options.
optionDeclarations =
pkgs.lib.fixableDeclarationsOf configComponents extraArgs config_;
# Optionally check wether all config values have corresponding
# option declarations.
config = pkgs.checker config_
config_.environment.checkConfigurationOptions
optionDeclarations config_;
}