systemd service configuration for NixOS (KDE)

[valopok]

It took me quite a while to get keymapper working correctly after boot, so here are my systemd services.
I only tried this on KDE, but probably also works on other DEs.
Hopefully they're helpful for someone :)

  systemd.services.keymapperd = {
    enable = true;
    description = "keymapperd";
    wantedBy = ["multi-user.target"];
    after = ["network.target"];
    serviceConfig = {
      Type = "exec";
      Restart = "always";
      ExecStart = ''${pkgs.keymapper}/bin/keymapperd'';
    };
  };

  # important: lingering has to be enabled for the corresponding user
  systemd.user.services.keymapper = {
    enable = true;
    description = "keymapper";
    wantedBy = ["default.target"];
    after = ["graphical-session.target"];
    requires = ["graphical-session.target"];
    serviceConfig = {
      Type = "simple";
      Restart = "always";
      ExecStart = ''${pkgs.keymapper}/bin/keymapper --no-tray --config ./nixos/packages/keymapper/keymapper.conf'';
    };
  };

Lingering can be enabled by simply setting users.users.<username>.linger = true;