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);
config_ =
pkgs.lib.fixOptionSets
pkgs.lib.mergeOptionSets
{ inherit pkgs; } configComponents;
optionDeclarations =
pkgs.lib.fixOptionSetsFun
pkgs.lib.filterOptionSets
{ inherit pkgs; } configComponents
config_;
# Optionally check wether all config values have corresponding
# option declarations.
config = pkgs.checker config_
config_.environment.checkConfigurationOptions
optionDeclarations config_;
}