245 lines
8.4 KiB
Nix
245 lines
8.4 KiB
Nix
{ config, options, lib, pkgs, ... }:
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with lib;
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let
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cfg = config.nixpkgs;
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opt = options.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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recursiveUpdate 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 = x:
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let traceXIfNot = c:
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if c x then true
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else lib.traceSeqN 1 x false;
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in traceXIfNot 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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defaultPkgs = import ../../.. {
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inherit (cfg) config overlays localSystem crossSystem;
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};
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finalPkgs = if opt.pkgs.isDefined then cfg.pkgs.appendOverlays cfg.overlays else defaultPkgs;
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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 (cfg) config overlays localSystem crossSystem;
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}
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'';
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type = pkgsType;
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example = literalExample ''import <nixpkgs> {}'';
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description = ''
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If set, the pkgs argument to all NixOS modules is the value of
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this option, extended with <code>nixpkgs.overlays</code>, if
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that is also set. Either <code>nixpkgs.crossSystem</code> or
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<code>nixpkgs.localSystem</code> will be used in an assertion
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to check that the NixOS and Nixpkgs architectures match. Any
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other options in <code>nixpkgs.*</code>, notably <code>config</code>,
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will be ignored.
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If unset, the pkgs argument to all NixOS modules is determined
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as shown in the default value for this option.
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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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<code>localSystem</code>, and <code>crossSystem</code> come
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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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[
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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. Each function in the list
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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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If <code>nixpkgs.pkgs</code> is set, overlays specified here
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will be applied after the overlays that were already present
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in <code>nixpkgs.pkgs</code>.
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'';
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};
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localSystem = mkOption {
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type = types.attrs; # TODO utilize lib.systems.parsedPlatform
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default = { inherit (cfg) system; };
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example = { system = "aarch64-linux"; config = "aarch64-unknown-linux-gnu"; };
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# Make sure that the final value has all fields for sake of other modules
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# referring to this. TODO make `lib.systems` itself use the module system.
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apply = lib.systems.elaborate;
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defaultText = literalExample
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''(import "''${nixos}/../lib").lib.systems.examples.aarch64-multiplatform'';
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description = ''
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Specifies the platform on which NixOS should be built. When
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<code>nixpkgs.crossSystem</code> is unset, it also specifies
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the platform <emphasis>for</emphasis> which NixOS should be
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built. If this option is unset, it defaults to the platform
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type of the machine where evaluation happens. Specifying this
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option is useful when doing distributed multi-platform
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deployment, or when building virtual machines. See its
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description in the Nixpkgs manual for more details.
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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; # TODO utilize lib.systems.parsedPlatform
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default = null;
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example = { system = "aarch64-linux"; config = "aarch64-unknown-linux-gnu"; };
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defaultText = literalExample
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''(import "''${nixos}/../lib").lib.systems.examples.aarch64-multiplatform'';
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description = ''
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Specifies the platform for which NixOS should be
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built. Specify this only if it is different from
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<code>nixpkgs.localSystem</code>, the platform
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<emphasis>on</emphasis> which NixOS should be built. In other
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words, specify this to cross-compile NixOS. Otherwise it
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should be set as null, the default. See its description in the
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Nixpkgs manual for more details.
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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 on which NixOS should be built.
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It is better to specify <code>nixpkgs.localSystem</code> instead.
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<programlisting>
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{
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nixpkgs.system = ..;
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}
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</programlisting>
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is the same as
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<programlisting>
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{
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nixpkgs.localSystem.system = ..;
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}
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</programlisting>
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See <code>nixpkgs.localSystem</code> for more information.
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Ignored when <code>nixpkgs.localSystem</code> is set.
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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 = finalPkgs;
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};
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assertions = [
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(
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let
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nixosExpectedSystem =
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if config.nixpkgs.crossSystem != null
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then config.nixpkgs.crossSystem.system
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else config.nixpkgs.localSystem.system;
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nixosOption =
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if config.nixpkgs.crossSystem != null
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then "nixpkgs.crossSystem"
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else "nixpkgs.localSystem";
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pkgsSystem = finalPkgs.stdenv.targetPlatform.system;
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in {
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assertion = nixosExpectedSystem == pkgsSystem;
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message = "The NixOS nixpkgs.pkgs option was set to a Nixpkgs invocation that compiles to target system ${pkgsSystem} but NixOS was configured for system ${nixosExpectedSystem} via NixOS option ${nixosOption}. The NixOS system settings must match the Nixpkgs target system.";
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}
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)
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];
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};
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}
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