config-file-locations.patch

diff --git a/daemon/gamemode-config.c b/daemon/gamemode-config.c
index 6b8f5d9..c1fe921 100644
--- a/daemon/gamemode-config.c
+++ b/daemon/gamemode-config.c
@@ -346,7 +346,7 @@ static void load_config_files(GameModeConfig *self)
 		bool protected;
 	};
 	struct ConfigLocation locations[CONFIG_NUM_LOCATIONS] = {
-		{ "/usr/share/gamemode", true }, /* shipped default config */
+		{ "@gamemode@/share/gamemode", true }, /* shipped default config */
 		{ "/etc", true },                /* administrator config */
 		{ config_location_home, false }, /* $XDG_CONFIG_HOME or $HOME/.config/ */
 		{ config_location_local, false } /* local data eg. $PWD */

gamemode.nix

{ stdenv
, lib
, fetchFromGitHub
, meson
, ninja
, pkgconfig
, cmake
, systemd
, dbus
# , withDaemon ? true
, pkexecPath ? "/run/wrappers/bin/pkexec"
}:

# TODO?: see linux-steam-integration, produce a 32-bit and 64-bit build for the client lib?
stdenv.mkDerivation rec {
  name = "gamemode-${version}";
  version = "1.4";

  src = fetchFromGitHub {
    owner = "FeralInteractive";
    repo = "gamemode";
    rev = "${version}";
    sha256 = "19s73yblbv8c7dw41sb713cjy1y6wr2srn9wvqdcsqgc159z4sj2";
    fetchSubmodules = true;
  };

  nativeBuildInputs = [ meson ninja pkgconfig cmake ];
  buildInputs = [ systemd dbus ];

  patches = [
    ./config-file-locations.patch
    ./dlopen.patch
    ./polkit.patch
  ];

  postPatch = ''
    substituteInPlace daemon/gamemode-config.c --subst-var-by gamemode $out
    
    # I had some other patches here, but they weren't useful
  '';

  # As far as I can tell, this only disables placing a SystemD unit file.
  # We intend to build our own with a NixOS module, so, that's fine.
  mesonFlags = [ 
    "-Dwith-systemd=false"
    "-Dwith-examples=false"
  ]

  # TODO: this has to be commented for now, because gamemoded only
  # compiles the gamemoderun shell-script if the daemon is also enabled.
  # In the future, I'll try and commit upstream enabling the two to be
  # deployed independently (so that 32-bit chroot envs can use gamemoderun
  # without also compiling a daemon), as that seems healthier than patching
  # locally.
  #  ++ (if (!withDaemon) then [
  #     "-Dwith-daemon=false"
  #   ] else []
  # );

  meta = with stdenv.lib; {
    description = "gamemode";
    longDescription = ''
      GameMode is a daemon/lib combo for Linux that allows games to request a
      set of optimisations be temporarily applied to the host OS and/or a game
      process.
    '';
    homepage = https://github.com/FeralInteractive/gamemode;
    license = licenses.mit;
  };
}