In reply to @fufexan:matrix.org
I get that it outputs something like "nixpkgs/winestreamproxy" = final: prev: { }; as written in the doc, but I don't really get what's in the set

In reply to @fufexan:matrix.org
I get that it outputs something like "nixpkgs/winestreamproxy" = final: prev: { }; as written in the doc, but I don't really get what's in the set

what I wanted to split the overlay for was, I have it in this repo but I want to import wine-tkg and winestreamproxy to be used in my dotfiles overlay, which looks like this

{ inputs }:
let
  osu = inputs.osu-nix.overlays;
in

final: prev: {
  discord-electron = prev.callPackage ./discord {
    branch = "stable";
    pkgs = prev;
  };

  kakoune-cr = prev.callPackage ./kakoune.cr { inherit (inputs) kakoune-cr; };

  picom-jonaburg = prev.picom.overrideAttrs (
    old: { src = inputs.picom-jonaburg; }
  );

  rocket-league = prev.callPackage ./rocket-league {
    wine = final.callPackage osu."nixpkgs/wine-tkg" { };

    winestreamproxy = final.callPackage osu."nixpkgs/winestreamproxy" { };
  };

  technic-launcher = prev.callPackage ./technic-launcher { };
}

Overlays would have to be applyed, then the packages are avaliable as usual. Something like:

{
  pkgs = import nixpkgs { config = {}; overlays [ osu."nixpkgs/wine-tkg"  osu."nixpkgs/winestreamproxy" ];};
  wine-tkg = pkgs.wine-tkg;
}

Overlays would have to be applyed, then the packages are avaliable as usual. Something like:

{
  pkgs = import nixpkgs { config = {}; overlays [osu."nixpkgs/wine-tkg"  osu."nixpkgs/winestreamproxy" ];};
  wine-tkg = pkgs.wine-tkg;
}

Overlays would have to be applyed, then the packages are avaliable as usual. Something like:

{
  pkgs = import nixpkgs { config = {}; overlays [
    osu."nixpkgs/wine-tkg"  osu."nixpkgs/winestreamproxy"
  ];};
  wine-tkg = pkgs.wine-tkg;
}

Overlays would have to be applied, then the packages are avaliable as usual. Something like:

{
  pkgs = import nixpkgs { config = {}; overlays [
    osu."nixpkgs/wine-tkg"  osu."nixpkgs/winestreamproxy"
  ];};
  wine-tkg = pkgs.wine-tkg;
}

Overlays would have to be applied, then the packages are available as usual. Something like:

{
  pkgs = import nixpkgs { config = {}; overlays [
    osu."nixpkgs/wine-tkg"  osu."nixpkgs/winestreamproxy"
  ];};
  wine-tkg = pkgs.wine-tkg;
}

now nix flake check fails with

error: attribute 'currentSystem' missing

       at /nix/store/vmcb8svgl9h84mkqmg1nazl9zgpgn7q0-source/pkgs/top-level/impure.nix:18:43:

           17|   # (build, in GNU Autotools parlance) platform.
           18|   localSystem ? { system = args.system or builtins.currentSystem; }
             |                                           ^
           19|