f2a45a47d4
This lets the user set pkgs directly, so that it can be injected externally and be reused among evaluations of NixOS.
155 lines
4.7 KiB
Nix
155 lines
4.7 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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cfg = config.nixpkgs;
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isConfig = x:
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builtins.isAttrs x || builtins.isFunction x;
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optCall = f: x:
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if builtins.isFunction f
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then f x
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else f;
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mergeConfig = lhs_: rhs_:
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let
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lhs = optCall lhs_ { inherit pkgs; };
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rhs = optCall rhs_ { inherit pkgs; };
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in
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lhs // rhs //
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optionalAttrs (lhs ? packageOverrides) {
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packageOverrides = pkgs:
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optCall lhs.packageOverrides pkgs //
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optCall (attrByPath ["packageOverrides"] ({}) rhs) pkgs;
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} //
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optionalAttrs (lhs ? perlPackageOverrides) {
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perlPackageOverrides = pkgs:
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optCall lhs.perlPackageOverrides pkgs //
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optCall (attrByPath ["perlPackageOverrides"] ({}) rhs) pkgs;
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};
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configType = mkOptionType {
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name = "nixpkgs-config";
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description = "nixpkgs config";
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check = traceValIfNot isConfig;
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merge = args: fold (def: mergeConfig def.value) {};
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};
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overlayType = mkOptionType {
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name = "nixpkgs-overlay";
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description = "nixpkgs overlay";
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check = builtins.isFunction;
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merge = lib.mergeOneOption;
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};
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pkgsType = mkOptionType {
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name = "nixpkgs";
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description = "An evaluation of Nixpkgs; the top level attribute set of packages";
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check = builtins.isAttrs;
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};
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in
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{
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options.nixpkgs = {
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pkgs = mkOption {
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defaultText = literalExample
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''import "''${nixos}/.." {
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inherit (config.nixpkgs) config overlays system;
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}
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'';
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default = import ../../.. { inherit (cfg) config overlays system; };
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type = pkgsType;
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example = literalExample ''import <nixpkgs> {}'';
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description = ''
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This is the evaluation of Nixpkgs that will be provided to
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all NixOS modules. Defining this option has the effect of
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ignoring the other options that would otherwise be used to
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evaluate Nixpkgs, because those are arguments to the default
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value. The default value imports the Nixpkgs source files
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relative to the location of this NixOS module, because
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NixOS and Nixpkgs are distributed together for consistency,
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so the <code>nixos</code> in the default value is in fact a
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relative path. The <code>config</code>, <code>overlays</code>
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and <code>system</code> come from this option's siblings.
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This option can be used by applications like NixOps to increase
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the performance of evaluation, or to create packages that depend
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on a container that should be built with the exact same evaluation
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of Nixpkgs, for example. Applications like this should set
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their default value using <code>lib.mkDefault</code>, so
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user-provided configuration can override it without using
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<code>lib</code>.
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Note that using a distinct version of Nixpkgs with NixOS may
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be an unexpected source of problems. Use this option with care.
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'';
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};
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config = mkOption {
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default = {};
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example = literalExample
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''
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{ firefox.enableGeckoMediaPlayer = true; }
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'';
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type = configType;
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description = ''
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The configuration of the Nix Packages collection. (For
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details, see the Nixpkgs documentation.) It allows you to set
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package configuration options.
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Ignored when <code>nixpkgs.pkgs</code> is set.
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'';
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};
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overlays = mkOption {
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default = [];
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example = literalExample
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''
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[ (self: super: {
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openssh = super.openssh.override {
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hpnSupport = true;
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withKerberos = true;
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kerberos = self.libkrb5;
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};
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};
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) ]
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'';
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type = types.listOf overlayType;
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description = ''
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List of overlays to use with the Nix Packages collection.
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(For details, see the Nixpkgs documentation.) It allows
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you to override packages globally. This is a function that
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takes as an argument the <emphasis>original</emphasis> Nixpkgs.
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The first argument should be used for finding dependencies, and
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the second should be used for overriding recipes.
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Ignored when <code>nixpkgs.pkgs</code> is set.
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'';
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};
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system = mkOption {
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type = types.str;
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example = "i686-linux";
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description = ''
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Specifies the Nix platform type for which NixOS should be built.
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If unset, it defaults to the platform type of your host system.
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Specifying this option is useful when doing distributed
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multi-platform deployment, or when building virtual machines.
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Ignored when <code>nixpkgs.pkgs</code> is set.
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'';
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};
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};
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config = {
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_module.args = {
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pkgs = cfg.pkgs;
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pkgs_i686 = cfg.pkgs.pkgsi686Linux;
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};
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};
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}
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