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166 lines
5.1 KiB
Nix
166 lines
5.1 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 || lib.isFunction x;
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optCall = f: x:
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if lib.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 = lib.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 crossSystem; };
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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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{ allowBroken = true; allowUnfree = 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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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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crossSystem = mkOption {
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type = types.nullOr types.attrs;
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default = null;
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description = ''
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The description of the system we're cross-compiling to, or null
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if this isn't a cross-compile. See the description of the
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crossSystem argument in the nixpkgs manual.
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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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