initial attempt for declarative proton-ge

flake.lock

@@ -480,6 +480,18 @@
         "type": "github"
       }
     },
+    "proton-ge": {
+      "flake": false,
+      "locked": {
+        "narHash": "sha256-/68J3aVmHqrrcNk4DkYSBzfNyIQmbcUGg3yOlDq1ts8=",
+        "type": "tarball",
+        "url": "https://github.com/GloriousEggroll/proton-ge-custom/releases/download/GE-Proton8-14/GE-Proton8-14.tar.gz"
+      },
+      "original": {
+        "type": "tarball",
+        "url": "https://github.com/GloriousEggroll/proton-ge-custom/releases/download/GE-Proton8-14/GE-Proton8-14.tar.gz"
+      }
+    },
     "root": {
       "inputs": {
         "Comment-nvim-src": "Comment-nvim-src",
@@ -504,6 +516,7 @@
         "nvim-lspconfig-src": "nvim-lspconfig-src",
         "nvim-tree-lua-src": "nvim-tree-lua-src",
         "nvim-treesitter-src": "nvim-treesitter-src",
+        "proton-ge": "proton-ge",
         "telescope-nvim-src": "telescope-nvim-src",
         "telescope-project-nvim-src": "telescope-project-nvim-src",
         "toggleterm-nvim-src": "toggleterm-nvim-src",

flake.nix

@@ -157,6 +157,14 @@
       flake = false;
     };
 
+    # GE version of Proton for game compatibility
+    # Alternatively, could consider using https://github.com/fufexan/nix-gaming
+    proton-ge = {
+      url =
+        "https://github.com/GloriousEggroll/proton-ge-custom/releases/download/GE-Proton8-14/GE-Proton8-14.tar.gz";
+      flake = false;
+    };
+
     # Nextcloud Apps
     nextcloud-news = {
       url =
@@ -216,6 +224,7 @@
         (import ./overlays/nextcloud-apps.nix inputs)
         (import ./overlays/betterlockscreen.nix)
         (import ./overlays/age.nix inputs)
+        (import ./overlays/proton-ge.nix inputs)
       ];
 
       # System types to support.

modules/nixos/gaming/steam.nix

@@ -22,6 +22,11 @@
 
     ];
 
+    # Adapted in part from: https://github.com/Shawn8901/nix-configuration/blob/1c48be94238a9f463cf0bbd1e1842a4454286514/modules/nixos/steam-compat-tools/default.nix
+    # Based on: https://github.com/NixOS/nixpkgs/issues/73323
+    environment.sessionVariables.STEAM_EXTRA_COMPAT_TOOLS_PATHS =
+      lib.makeBinPath [ pkgs.proton-ge-custom ];
+
     # Seems like NetworkManager can help speed up Steam launch
     # https://www.reddit.com/r/archlinux/comments/qguhco/steam_startup_time_arch_1451_seconds_fedora_34/hi8opet/
     networking.networkmanager.enable = true;

overlays/proton-ge.nix

@@ -0,0 +1,15 @@
+# Adapted from:
+# https://github.com/Shawn8901/nix-configuration/blob/182a45a6b193143ff7ff8e78bb66f7b869ea48d4/packages/proton-ge-custom/default.nix
+# Based on: https://github.com/NixOS/nixpkgs/issues/73323
+
+inputs: _final: prev: {
+  proton-ge-custom = prev.stdenv.mkDerivation (finalAttrs: rec {
+    name = "proton-ge-custom";
+    version = "0.1"; # Made up
+    src = inputs.proton-ge;
+    installPhase = ''
+      mkdir -p $out/bin
+      cp -r ${src}/* -t $out/bin/
+    '';
+  });
+}