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{ config, lib, pkgs, ... }:
with lib;
let
isConfig = x:
builtins.isAttrs x || builtins.isFunction x;
optCall = f: x:
if builtins.isFunction f
then f x
else f;
mergeConfig = lhs_: rhs_:
let
lhs = optCall lhs_ { inherit pkgs; };
rhs = optCall rhs_ { inherit pkgs; };
in
lhs // rhs //
optionalAttrs (lhs ? packageOverrides) {
packageOverrides = pkgs:
optCall lhs.packageOverrides pkgs //
optCall (attrByPath ["packageOverrides"] ({}) rhs) pkgs;
};
configType = mkOptionType {
name = "nixpkgs config";
check = x:
let traceXIfNot = c:
if c x then true
else lib.traceSeqN 1 x false;
in traceXIfNot isConfig;
merge = args: fold (def: mergeConfig def.value) {};
};
in
{
options = {
nixpkgs.overlays = mkOption {
default = [];
};
nixpkgs.config = mkOption {
default = {};
example = literalExample
''
{ firefox.enableGeckoMediaPlayer = true;
packageOverrides = pkgs: {
firefox60Pkgs = pkgs.firefox60Pkgs.override {
enableOfficialBranding = true;
};
};
}
'';
type = configType;
description = ''
The configuration of the Nix Packages collection. (For
details, see the Nixpkgs documentation.) It allows you to set
package configuration options, and to override packages
globally through the <varname>packageOverrides</varname>
option. The latter is a function that takes as an argument
the <emphasis>original</emphasis> Nixpkgs, and must evaluate
to a set of new or overridden packages.
'';
};
nixpkgs.crossSystem = mkOption {
internal = true;
default = null;
};
nixpkgs.system = mkOption {
type = types.str;
example = "i686-linux";
description = ''
Specifies the Nix platform type for which NixOS should be built.
If unset, it defaults to the platform type of your host system.
Specifying this option is useful when doing distributed
multi-platform deployment, or when building virtual machines.
'';
};
nixpkgs.pkgs = mkOption {
};
};
config = {
_module.args.pkgs = config.nixpkgs.pkgs;
};
}