nix-config-v2/modules/sound/shairport.nix

{ lib, pkgs, userName, ...}: {
  services.shairport-sync = {
    enable = pkgs.stdenv.isLinux;
    openFirewall = pkgs.stdenv.isLinux;
    # arguments = "-v -o pa";
  };

  systemd.services.shairport-sync = {
    serviceConfig = {
      User = lib.mkForce "${userName}";
    };
    environment = {
      XDG_RUNTIME_DIR = "/run/user/1000";
    };
  };
}