The option definition `wsl.nativeSystemd' in no longer has any effect; please remove it.

[TheAyes]

Bug description

I'm currently trying to build nixos-wsl with flakes but it throws me an error I can't resolve

To Reproduce

Try to build the system with nixos-wsl enabled

Logs

[ayes@leda:/mnt/c/Projekte/.ayes]$ nixos-rebuild build --use-remote-sudo -v --flake .
$ cat /proc/sys/kernel/hostname
building the system configuration...
Building in flake mode.
$ nix --extra-experimental-features nix-command flakes build .#nixosConfigurations."leda".config.system.build.toplevel -v
warning: Git tree '/mnt/c/Projekte/.ayes' is dirty
error:
       … in the left operand of the update (//) operator
         at «nix-internal»/call-flake.nix:69:13:
           68|             # This is shadowed in the next //
           69|             // sourceInfo
             |             ^
           70|             // {

       … while evaluating the attribute 'config.flake'
         at /nix/store/9jn1cxgvdiv2jd7b8g794qiv16xxv7bq-source/modules.nix:334:9:
          333|         options = checked options;
          334|         config = checked (removeAttrs config [ "_module" ]);
             |         ^
          335|         _module = checked (config._module);

       (stack trace truncated; use '--show-trace' to show the full, detailed trace)

       error: The option `assertions' does not exist. Definition values:
       - In `/nix/store/ni33bns6g3qpcnb7f8r3bk8acxp7v0ag-source/modules/systemd':
           [
             {
               assertion = true;
               message = ''
                 The option definition `wsl.nativeSystemd' in  no longer has any effect; please remove it.
           ...

[ayes@leda:/mnt/c/Projekte/.ayes]$

WSL version

WSL-Version: 2.4.11.0                                                                                                                                                                                                                                                                                               
Kernelversion: 5.15.167.4-1                                                                                                                                                                                                                                                                                         
WSLg-Version: 1.0.65
MSRDC-Version: 1.2.5716
Direct3D-Version: 1.611.1-81528511
DXCore-Version: 10.0.26100.1-240331-1435.ge-release
Windows-Version: 10.0.26100.2894

My configuration:

  imports = [
  ];
  system.stateVersion = "23.11";
  wsl = {
    enable = false;

    #defaultUser = "ayes";

    wslConf = {
      network.hostname = "leda";
    };
  };

  environment = {
    systemPackages = with pkgs; [
    ];
  };
}

my flake

{
  inputs = {
    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
    home-manager = {
      url = "github:nix-community/home-manager";
      inputs.nixpkgs.follows = "nixpkgs";
    };
    nixos-wsl.url = "github:nix-community/NixOS-WSL/main";

    flake-parts.url = "github:hercules-ci/flake-parts";
  };

  outputs = inputs @ {
    nixpkgs,
    flake-parts,
    ...
  }:
    flake-parts.lib.mkFlake {inherit inputs;} {
      imports = [
        inputs.nixos-wsl.nixosModules.default

        ./modules/flake/host-manager
      ];

      systems = [
        "x86_64-linux"
      ];

      host-manager = {
        enable = false;
        hosts = {
          leda.enable = true;
        };
      };

      flake = {
      };

      perSystem = {
        pkgs,
        config,
        ...
      }: {
        formatter = pkgs.nixpkgs-fmt;
      };
    };
}

[SuperSandro2000]

Something is odd about your flake, maybe in flake parts. No idea.

error:
       … while evaluating the attribute 'value'
         at /nix/store/0zqxdd52ssy1jbj7m85b4wrrwrpjmidy-source/lib/modules.nix:853:9:
          852|     in warnDeprecation opt //
          853|       { value = addErrorContext "while evaluating the option `${showOption loc}':" value;
             |         ^
          854|         inherit (res.defsFinal') highestPrio;

       … while evaluating the option `wsl.nativeSystemd':

       … while calling the 'throw' builtin
         at /nix/store/0zqxdd52ssy1jbj7m85b4wrrwrpjmidy-source/lib/modules.nix:1139:20:
         1138|         visible = false;
         1139|         apply = x: throw "The option `${showOption optionName}' can no longer be used since it's been removed. ${replacementInstructions}";
             |                    ^
         1140|       });

       error: The option `wsl.nativeSystemd' can no longer be used since it's been removed. Native systemd is now always enabled as support for syschdemd has been removed

nix-repl>

[austen-aer]

This should not be closed. I can reproduce locally with the following minimal configuration:

{
  inputs = {
    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
    nixos-wsl.url = "github:nix-community/NixOS-WSL/main";

    flake-parts.url = "github:hercules-ci/flake-parts";
  };

  outputs =
    inputs@{
      nixpkgs,
      flake-parts,
      ...
    }:
    flake-parts.lib.mkFlake { inherit inputs; } {
      imports = [
        inputs.nixos-wsl.nixosModules.default

      ];

      systems = [
        "x86_64-linux"
      ];

      flake = {
      };

      perSystem =
        {
          pkgs,
          config,
          ...
        }:
        {
          formatter = pkgs.nixpkgs-fmt;
        };
    };
}

[roberth]

@austen-aer You're importing a NixOS module into flake-parts instead of into NixOS. This is not meaningful, because a NixOS configuration and a flake are different concepts, as demonstrated for instance by the many to one relationship they are in.

NixOS-WSL can improve the reported error by declaring _class = "nixos"; in its importable NixOS modules.
That will tell the module system that they're incompatible. _class is a module attribute, a sibling to options, config and imports.

[austen-aer]

@austen-aer You're importing a NixOS module into flake-parts instead of into NixOS. This is not meaningful, because a NixOS configuration and a flake are different concepts, as demonstrated for instance by the many to one relationship they are in.

NixOS-WSL can improve the reported error by declaring _class = "nixos"; in its importable NixOS modules. That will tell the module system that they're incompatible. _class is a module attribute, a sibling to options, config and imports.

I realized this 30 seconds before you replied. Doh!