36 lines
No EOL
1.5 KiB
Nix
36 lines
No EOL
1.5 KiB
Nix
{config, pkgs, lib, ...}:
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let
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nixos-unstable-exprs = builtins.fetchTarball https://channels.nixos.org/nixos-unstable/nixexprs.tar.xz;
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nixos-unstable = import nixos-unstable-exprs {
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inherit (config.nixpkgs) config localSystem crossSystem;
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overlays = if config.unstable.usePkgsOverlays then config.pkgs.overlays else [];
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};
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nixos-unstable-version = builtins.concatStringsSep "." [
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(builtins.readFile "${builtins.toString nixos-unstable-exprs}/.version")
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(builtins.readFile "${builtins.toString nixos-unstable-exprs}/.version-suffix")
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];
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in
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{
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options.unstable = {
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enable = lib.mkEnableOption (lib.mkDoc ''
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use of unstable packages in configuration. You can use `unstablePkgs` in configuration modules
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'') // { default = true; };
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usePkgsOverlays = lib.mkEnableOption (lib.mkDoc ''
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use overlays from `nixpkgs.overlays`
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'');
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pkgs = lib.mkOption {
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default = if config.unstable.enable then nixos-unstable else pkgs;
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description = lib.mkDoc ''
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acts like pkgs, but it has unstable packages if `unstable.enable` is enabled.
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You can also use `unstablePkgs` in module arguments.
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'';
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visible = true;
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readOnly = true;
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type = lib.types.pkgs;
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};
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};
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config._module.args.unstablePkgs = config.unstable.pkgs;
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# FIXME: move it to the system derivation output (overrideAttrs config.system.build.toplevel?)
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config.environment.etc."NIXOS-UNSTABLE-VERSION".text = nixos-unstable-version;
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} |