nixos-config/config/env.nix

{
  config,
  pkgs,
  lib,
  ...
}: {
  environment.extraInit = let
    systemdBin = lib.getBin config.systemd.package;
  in ''
    set -a
    . /dev/fd/0 <<EOF
      $(${systemdBin}/lib/systemd/user-environment-generators/30-systemd-environment-d-generator)
    EOF
    set +a
  '';
}