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74 lines
2.6 KiB
Nix
74 lines
2.6 KiB
Nix
# From an end-user configuration file (`configuration.nix'), build a NixOS
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# configuration object (`config') from which we can retrieve option
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# values.
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# !!! Please think twice before adding to this argument list!
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# Ideally eval-config.nix would be an extremely thin wrapper
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# around lib.evalModules, so that modular systems that have nixos configs
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# as subcomponents (e.g. the container feature, or nixops if network
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# expressions are ever made modular at the top level) can just use
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# types.submodule instead of using eval-config.nix
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{ # !!! system can be set modularly, would be nice to remove
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system ? builtins.currentSystem
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, # !!! is this argument needed any more? The pkgs argument can
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# be set modularly anyway.
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pkgs ? null
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, # !!! what do we gain by making this configurable?
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baseModules ? import ../modules/module-list.nix
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, # !!! See comment about args in lib/modules.nix
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extraArgs ? {}
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, # !!! See comment about args in lib/modules.nix
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specialArgs ? {}
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, modules
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, # !!! See comment about check in lib/modules.nix
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check ? true
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, prefix ? []
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, lib ? import ../../lib
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}:
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let extraArgs_ = extraArgs; pkgs_ = pkgs;
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extraModules = let e = builtins.getEnv "NIXOS_EXTRA_MODULE_PATH";
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in if e == "" then [] else [(import e)];
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in
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let
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pkgsModule = rec {
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_file = ./eval-config.nix;
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key = _file;
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config = {
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# Explicit `nixpkgs.system` or `nixpkgs.localSystem` should override
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# this. Since the latter defaults to the former, the former should
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# default to the argument. That way this new default could propagate all
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# they way through, but has the last priority behind everything else.
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nixpkgs.system = lib.mkDefault system;
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# Stash the value of the `system` argument. When using `nesting.children`
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# we want to have the same default value behavior (immediately above)
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# without any interference from the user's configuration.
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nixpkgs.initialSystem = system;
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_module.args.pkgs = lib.mkIf (pkgs_ != null) (lib.mkForce pkgs_);
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};
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};
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in rec {
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# Merge the option definitions in all modules, forming the full
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# system configuration.
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inherit (lib.evalModules {
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inherit prefix check;
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modules = baseModules ++ extraModules ++ [ pkgsModule ] ++ modules;
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args = extraArgs;
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specialArgs =
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{ modulesPath = builtins.toString ../modules; } // specialArgs;
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}) config options _module;
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# These are the extra arguments passed to every module. In
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# particular, Nixpkgs is passed through the "pkgs" argument.
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extraArgs = extraArgs_ // {
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inherit baseModules extraModules modules;
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};
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inherit (_module.args) pkgs;
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}
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