Add compatibility with stand-alone home-manager

[tmarkov]

osConfig is not always available for homeManager modules - in particular, for standalone installations. This adds a default value for osConfig, and a home-manager-only option services.flatpak.enable whose default is inherited from osConfig. If osConfig is not available, the default is false.

Honestly I'm not sure if the best practice wouldn't be to just remove the reference to osConfig, but that would be a breaking change.

[gmodena]

Hey @tmarkov, thanks for this.

The module does not support standalone home-manager by design, since I don't have a decent test environment for that set up yet.

I'd love to support standalone home-manager though, so thanks a lot for starting this work.

I tried to deploy this change as a drop-in replacement on my test NixOs host, and nix flake check failed with:

error: A definition for option `home-manager.users.gmodena.services.flatpak.enable' is not of type `boolean'

Which might have more to do with my imports chain than your change, but I need to troubleshoot this regression before merging.

Could you maybe share some examples on how your setup? I'd like to understand:

• What is your base OS?
• How are importing and enabling nix-flatpak?
• How was flatpak installed on your system?

[tmarkov]

I had a bug there that most probably caused your issue. Can you try again now?

As for the details of my system:

• NixOS Unstable
• flatpak installed system-wide (services.flatpak.enable = true)
• but home-manager is standalone.

I use a flake with the following:

{
  inputs = {
    unstable.url = "github:nixos/nixpkgs/nixos-unstable";
    hm-unstable = {
      url = "github:nix-community/home-manager";
      inputs.nixpkgs.follows = "unstable";
    };
    ...
    nix-flatpak.url = "github:tmarkov/nix-flatpak/main";
  };
  outputs = inputs@{unstable, hm-unstable, ... }:{
    ...
    homeConfigurations = {
      "todor@todor-laptop" = hm-unstable.lib.homeManagerConfiguration {
        pkgs = import unstable {
          inherit system;
          config.allowUnfree = true;
        };
        extraSpecialArgs = { inherit inputs; system = "x86_64-linux"; };
        modules = [
          ./todor
        ];
      };
    };
  };
}

Then I have in my home.nix:

# home.nix
{ config, pkgs, ... }:
{
  inpotrs = [
    ...
    ./flatpak.nix
  ]
  ...
}

and flatpak.nix then contains

{ inputs, ... }:
{
  imports = [ inputs.nix-flatpak.homeManagerModules.nix-flatpak ];
  services.flatpak = {
    enable = true;
    update.auto.enable = true;
    packages = [
      "com.valvesoftware.Steam"
      "com.viber.Viber"
    ];
  };
}

[gmodena]

LGTM. Left a small nit.

I did a quick test and there's no obvious regression.

I'll need to run a couple more integration tests, but should be good to merge.

[gmodena]

@tmarkov thanks for the f/up and the examples!