a3ba049545
system and config shouldn't both be specified — each will be filled in based on the other when the system is elaborated.
397 lines
15 KiB
Nix
397 lines
15 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: foldr (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 = types.pkgs // {
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# This type is only used by itself, so let's elaborate the description a bit
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# for the purpose of documentation.
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description = "An evaluation of Nixpkgs; the top level attribute set of packages";
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};
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hasBuildPlatform = opt.buildPlatform.highestPrio < (mkOptionDefault {}).priority;
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hasHostPlatform = opt.hostPlatform.isDefined;
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hasPlatform = hasHostPlatform || hasBuildPlatform;
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# Context for messages
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hostPlatformLine = optionalString hasHostPlatform "${showOptionWithDefLocs opt.hostPlatform}";
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buildPlatformLine = optionalString hasBuildPlatform "${showOptionWithDefLocs opt.buildPlatform}";
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legacyOptionsDefined =
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optional (opt.localSystem.highestPrio < (mkDefault {}).priority) opt.system
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++ optional (opt.localSystem.highestPrio < (mkOptionDefault {}).priority) opt.localSystem
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++ optional (opt.crossSystem.highestPrio < (mkOptionDefault {}).priority) opt.crossSystem
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;
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defaultPkgs =
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if opt.hostPlatform.isDefined
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then
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let isCross = cfg.buildPlatform != cfg.hostPlatform;
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systemArgs =
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if isCross
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then {
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localSystem = cfg.buildPlatform;
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crossSystem = cfg.hostPlatform;
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}
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else {
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localSystem = cfg.hostPlatform;
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};
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in
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import ../../.. ({
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inherit (cfg) config overlays;
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} // systemArgs)
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else
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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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imports = [
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./assertions.nix
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./meta.nix
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(mkRemovedOptionModule [ "nixpkgs" "initialSystem" ] "The NixOS options `nesting.clone` and `nesting.children` have been deleted, and replaced with named specialisation. Therefore `nixpgks.initialSystem` has no effect anymore.")
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];
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options.nixpkgs = {
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pkgs = mkOption {
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defaultText = literalExpression ''
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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 = literalExpression "import <nixpkgs> {}";
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description = lib.mdDoc ''
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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 `nixpkgs.overlays`, if
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that is also set. Either `nixpkgs.crossSystem` or
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`nixpkgs.localSystem` 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 `nixpkgs.*`, notably `config`,
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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 `nixos` in the default value is in fact a
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relative path. The `config`, `overlays`,
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`localSystem`, and `crossSystem` 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 `lib.mkDefault`, so
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user-provided configuration can override it without using
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`lib`.
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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 = literalExpression
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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 = lib.mdDoc ''
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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 `nixpkgs.pkgs` 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 = literalExpression
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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 = lib.mdDoc ''
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List of overlays to apply to Nixpkgs.
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This option allows modifying the Nixpkgs package set accessed through the `pkgs` module argument.
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For details, see the [Overlays chapter in the Nixpkgs manual](https://nixos.org/manual/nixpkgs/stable/#chap-overlays).
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If the {option}`nixpkgs.pkgs` option is set, overlays specified using `nixpkgs.overlays` will be applied after the overlays that were already included in `nixpkgs.pkgs`.
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'';
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};
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hostPlatform = mkOption {
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type = types.either types.str types.attrs; # TODO utilize lib.systems.parsedPlatform
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example = { system = "aarch64-linux"; };
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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 = literalExpression
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''(import "''${nixos}/../lib").lib.systems.examples.aarch64-multiplatform'';
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description = lib.mdDoc ''
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Specifies the platform where the NixOS configuration will run.
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To cross-compile, set also `nixpkgs.buildPlatform`.
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Ignored when `nixpkgs.pkgs` is set.
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'';
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};
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buildPlatform = mkOption {
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type = types.either types.str types.attrs; # TODO utilize lib.systems.parsedPlatform
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default = cfg.hostPlatform;
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example = { system = "x86_64-linux"; };
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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.
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apply = lib.systems.elaborate;
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defaultText = literalExpression
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''config.nixpkgs.hostPlatform'';
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description = lib.mdDoc ''
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Specifies the platform on which NixOS should be built.
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By default, NixOS is built on the system where it runs, but you can
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change where it's built. Setting this option will cause NixOS to be
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cross-compiled.
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For instance, if you're doing distributed multi-platform deployment,
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or if you're building machines, you can set this to match your
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development system and/or build farm.
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Ignored when `nixpkgs.pkgs` is set.
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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"; };
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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 = literalExpression
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''(import "''${nixos}/../lib").lib.systems.examples.aarch64-multiplatform'';
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description = lib.mdDoc ''
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Systems with a recently generated `hardware-configuration.nix`
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do not need to specify this option, unless cross-compiling, in which case
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you should set *only* {option}`nixpkgs.buildPlatform`.
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If this is somehow not feasible, you may fall back to removing the
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{option}`nixpkgs.hostPlatform` line from the generated config and
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use the old options.
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Specifies the platform on which NixOS should be built. When
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`nixpkgs.crossSystem` is unset, it also specifies
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the platform *for* 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 `nixpkgs.pkgs` or `hostPlatform` is set.
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'';
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};
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# TODO deprecate. "crossSystem" is a nonsense identifier, because "cross"
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# is a relation between at least 2 systems in the context of a
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# specific build step, not a single system.
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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"; };
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description = lib.mdDoc ''
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Systems with a recently generated `hardware-configuration.nix`
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may instead specify *only* {option}`nixpkgs.buildPlatform`,
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or fall back to removing the {option}`nixpkgs.hostPlatform` line from the generated config.
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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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`nixpkgs.localSystem`, the platform
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*on* 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 `nixpkgs.pkgs` or `hostPlatform` 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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default =
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if opt.hostPlatform.isDefined
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then
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throw ''
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Neither ${opt.system} nor any other option in nixpkgs.* is meant
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to be read by modules and configurations.
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Use pkgs.stdenv.hostPlatform instead.
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''
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else
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throw ''
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Neither ${opt.hostPlatform} nor the legacy option ${opt.system} has been set.
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You can set ${opt.hostPlatform} in hardware-configuration.nix by re-running
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a recent version of nixos-generate-config.
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The option ${opt.system} is still fully supported for NixOS 22.05 interoperability,
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but will be deprecated in the future, so we recommend to set ${opt.hostPlatform}.
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'';
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defaultText = lib.literalMD ''
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Traditionally `builtins.currentSystem`, but unset when invoking NixOS through `lib.nixosSystem`.
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'';
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description = lib.mdDoc ''
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This option does not need to be specified for NixOS configurations
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with a recently generated `hardware-configuration.nix`.
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Specifies the Nix platform type on which NixOS should be built.
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It is better to specify `nixpkgs.localSystem` instead.
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```
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{
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nixpkgs.system = ..;
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}
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```
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is the same as
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```
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{
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nixpkgs.localSystem.system = ..;
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}
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```
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See `nixpkgs.localSystem` for more information.
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Ignored when `nixpkgs.pkgs`, `nixpkgs.localSystem` or `nixpkgs.hostPlatform` 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 =
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# We explicitly set the default override priority, so that we do not need
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# to evaluate finalPkgs in case an override is placed on `_module.args.pkgs`.
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# After all, to determine a definition priority, we need to evaluate `._type`,
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# which is somewhat costly for Nixpkgs. With an explicit priority, we only
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# evaluate the wrapper to find out that the priority is lower, and then we
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# don't need to evaluate `finalPkgs`.
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lib.mkOverride lib.modules.defaultOverridePriority
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finalPkgs.__splicedPackages;
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};
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assertions = let
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# Whether `pkgs` was constructed by this module. This is false when any of
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# nixpkgs.pkgs or _module.args.pkgs is set.
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constructedByMe =
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# We set it with default priority and it can not be merged, so if the
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# pkgs module argument has that priority, it's from us.
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(lib.modules.mergeAttrDefinitionsWithPrio options._module.args).pkgs.highestPrio
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== lib.modules.defaultOverridePriority
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# Although, if nixpkgs.pkgs is set, we did forward it, but we did not construct it.
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&& !opt.pkgs.isDefined;
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in [
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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 or (lib.systems.parse.doubleFromSystem (lib.systems.parse.mkSystemFromString config.nixpkgs.crossSystem.config))
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else config.nixpkgs.localSystem.system or (lib.systems.parse.doubleFromSystem (lib.systems.parse.mkSystemFromString config.nixpkgs.localSystem.config));
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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 = constructedByMe -> !hasPlatform -> 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 ${nixosOption}. The NixOS system settings must match the Nixpkgs target system.";
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}
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)
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{
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assertion = constructedByMe -> hasPlatform -> legacyOptionsDefined == [];
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message = ''
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Your system configures nixpkgs with the platform parameter${optionalString hasBuildPlatform "s"}:
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${hostPlatformLine
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}${buildPlatformLine
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}
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However, it also defines the legacy options:
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${concatMapStrings showOptionWithDefLocs legacyOptionsDefined}
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For a future proof system configuration, we recommend to remove
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the legacy definitions.
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'';
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}
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{
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assertion = opt.pkgs.isDefined -> cfg.config == {};
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message = ''
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Your system configures nixpkgs with an externally created instance.
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`nixpkgs.config` options should be passed when creating the instance instead.
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Current value:
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${lib.generators.toPretty { multiline = true; } opt.config}
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'';
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}
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];
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};
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# needs a full nixpkgs path to import nixpkgs
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meta.buildDocsInSandbox = false;
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}
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