82 lines
2.1 KiB
Nix
82 lines
2.1 KiB
Nix
# Nix related settings
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{ config, inputs, lib, options, pkgs, ... }:
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let
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cfg = config.my.system.nix;
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in
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{
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options.my.system.nix = with lib; {
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enable = my.mkDisableOption "nix configuration";
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linkInputs = my.mkDisableOption "link inputs to `/etc/nix/inputs/`";
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addToRegistry = my.mkDisableOption "add inputs and self to registry";
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addToNixPath = my.mkDisableOption "add inputs and self to nix path";
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overrideNixpkgs = my.mkDisableOption "point nixpkgs to pinned system version";
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};
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config = lib.mkIf cfg.enable (lib.mkMerge [
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{
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assertions = [
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{
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assertion = cfg.addToNixPath -> cfg.linkInputs;
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message = ''
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enabling `my.system.nix.addToNixPath` needs to have
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`my.system.nix.linkInputs = true`
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'';
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}
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];
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}
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{
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nix = {
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package = pkgs.nix;
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settings = {
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experimental-features = [ "nix-command" "flakes" ];
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};
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};
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}
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(lib.mkIf cfg.addToRegistry {
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nix.registry = {
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# Allow me to use my custom package using `nix run self#pkg`
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self.flake = inputs.self;
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# Use pinned nixpkgs when using `nix run pkgs#<whatever>`
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pkgs.flake = inputs.nixpkgs;
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# ... And with `nix run nixpkgs#<whatever>`
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nixpkgs.flake = lib.mkIf cfg.overrideNixpkgs inputs.nixpkgs;
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# Add NUR to run some packages that are only present there
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nur.flake = inputs.nur;
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};
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})
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(lib.mkIf cfg.linkInputs {
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environment.etc =
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let
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makeLink = n: v: {
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name = "nix/inputs/${n}";
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value = { source = v.outPath; };
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};
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makeLinks = lib.mapAttrs' makeLink;
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channels = {
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self = inputs.self;
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pkgs = inputs.nixpkgs;
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nur = inputs.nur;
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} // lib.optionalAttrs cfg.overrideNixpkgs {
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nixpkgs = inputs.nixpkgs;
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};
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in
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makeLinks channels;
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})
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(lib.mkIf cfg.addToNixPath {
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nix.nixPath = [
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"/etc/nix/inputs"
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]
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++ options.nix.nixPath.default;
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})
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]);
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}
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