Using fleek across MacOS and Linux

[qnm]

TL;DR Is there a way to manage packages across multiple platforms without using custom nix?

I'm using Fleek across multiple devices, mostly Linux but also a MacOS machine.

When I use fleek add for a particular package, if that package doesn't exist in both Linux and MacOS Nix repos, then my fleek apply will fail on the device without the package.

I'm not sure what the correct behaviour here should be. In home-manager I had a conditional statement, but I prefer the simplicity of Fleek as it covers 95% of my needs.

[naudster]

I'd also appreciate feedback on this problem.

If we rely on including arch specific packages in custom.nix, what's the syntax? I'm pretty new to nix and can't figure it out. Thanks a lot.

[naudster]

Figured it out. Example custom.nix to include the barrier package:

{ pkgs, misc, ... }:
{
  # FEEL FREE TO EDIT: This file is NOT managed by fleek. 
  home.packages = with pkgs;  [
    barrier
  ];
}

As @qnm asks, a better solution would be great. Maybe allowing packages under systems in fleek.yml?

systems:
    - arch: x86_64
      hostname: alien
      os: linux
      packages:
          - barrier