41 lines
1.4 KiB
Nix
41 lines
1.4 KiB
Nix
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{
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self,
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inputs,
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...
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}: {
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# Escape hatch for packages that move faster than the stable channel.
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#
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# `pkgs.unstable.<name>` resolves against nixos-unstable while the rest of the
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# system stays on nixos-26.05. Keep the number of consumers small and prefer
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# stable unless there is a concrete reason; every unstable package drags a bit
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# of the unstable closure (glibc, stdenv) in alongside the stable one.
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#
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# Bump with `nix flake update nixpkgs-unstable`.
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flake.overlays.unstable = _final: prev: {
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unstable = import inputs.nixpkgs-unstable {
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inherit (prev.stdenv.hostPlatform) system;
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# Carries allowUnfree (set in nix-settings.nix) into the unstable set.
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inherit (prev) config;
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};
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};
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# This flake has two independent `pkgs` instances, and the overlay has to be
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# registered on both or `pkgs.unstable` would exist in some modules only:
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#
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# 1. the NixOS module system's `pkgs` - plain modules such as
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# modules/features/bun, modules/system/core
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# 2. flake-parts' perSystem `pkgs` - modules built with `moduleWithSystem`,
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# such as modules/attrs/development, which ignore `nixpkgs.overlays`
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flake.nixosModules.overlays = {...}: {
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nixpkgs.overlays = [self.overlays.unstable];
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};
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perSystem = {system, ...}: {
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_module.args.pkgs = import inputs.nixpkgs {
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inherit system;
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overlays = [self.overlays.unstable];
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config.allowUnfree = true;
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};
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};
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}
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