Add proton-cachyos package and update gamescope-run steam wrapper to use the properly configured steam executable

home/global/common/gaming/gamescope.nix

@@ -2,9 +2,10 @@
 ## This is only configured for AMD GPUs; Nvidia might require additional configuration.
 ## For example host (PC) configuration using this module go to home/hosts/rune
 {
-  pkgs,
   config,
   lib,
+  osConfig,
+  pkgs,
   ...
 }:
 let
@@ -34,6 +35,11 @@ let
     set -x XCURSOR_THEME '${cursorTheme}'
     set -x XCURSOR_PATH '${cursorPackage}/share/icons'
 
+    # Wayland specific environment variables
+    # set -x PROTON_USE_SDL 1
+    set -x PROTON_USE_WAYLAND 1
+    set -x PROTON_ENABLE_HDR 1
+
     # Gamescope display identifier
     set -x GAMESCOPE_WAYLAND_DISPLAY "gamescope-0"
 
@@ -119,18 +125,22 @@ let
         set -a final_args (string split ' ' -- $GAMESCOPE_EXTRA_OPTS)
     end
 
+    # Show the command being executed
+    echo -e "\033[1;36m[gamescope-run]\033[0m Running: \033[1;34m${lib.getExe pkgs.gamescope_git}\033[0m $final_args \033[1;32m--\033[0m $argv"
+
     # Execute gamescope with the final arguments and the command
     exec ${lib.getExe pkgs.gamescope_git} $final_args -- $argv
   '';
 
   ## Effectively forces gamescope-run to be the default way to use Steam
   ## Why? Because , .desktops created by Steam would not run under gamescope-run otherwise
+  ## !!! do not use 'pkgs.steam', it will not be configured correctly
   steam-wrapper = pkgs.writeScriptBin "steam" ''
     #!${lib.getExe pkgs.fish}
     # This script wraps the original steam command to launch it
     # with gamescope-run in a big picture mode.
     # All arguments passed to this script are forwarded.
-    exec ${lib.getExe gamescope-run} -x "-e" ${lib.getExe pkgs.steam} -tenfoot $argv
+    exec ${lib.getExe gamescope-run} -x "-e" ${lib.getExe osConfig.programs.steam.package} -tenfoot $argv
   '';
 
   ## Ensures that all Lutris game launches go through Gamescope

hosts/global/common/gaming.nix

@@ -74,19 +74,21 @@
 
             inherit (pkgs)
               gamemode
-              mangohud
               gperftools
               keyutils
               libkrb5
               libpng
               libpulseaudio
               libvorbis
+              mangohud
               ;
           });
       };
-      extraCompatPackages = [ pkgs.unstable.proton-ge-bin ];
-      # Conflicting with gamescope_git
-      # gamescopeSession.enable = true;
+      extraCompatPackages = with pkgs; [
+        proton-ge-bin
+        proton-ge-custom
+        proton-cachyos
+      ];
     };
 
     gamemode = {

pkgs/proton-cachyos/package.nix

@@ -0,0 +1,47 @@
+{
+  callPackage,
+  stdenv,
+  lib,
+  fetchurl,
+}:
+let
+  protonGeTitle = "Proton-CachyOS";
+  protonGeVersions = lib.importJSON ./versions.json;
+in
+stdenv.mkDerivation {
+  name = "proton-cachyos";
+  version = "${protonGeVersions.base}.${protonGeVersions.release}";
+
+  src =
+    let
+      tagName = "cachyos-${protonGeVersions.base}-${protonGeVersions.release}-slr";
+      fileName = "proton-cachyos-${protonGeVersions.base}-${protonGeVersions.release}-slr-x86_64.tar.xz";
+    in
+    fetchurl {
+      url = "https://github.com/CachyOS/proton-cachyos/releases/download/${tagName}/${fileName}";
+      inherit (protonGeVersions) hash;
+    };
+
+  buildCommand =
+    ''
+      mkdir -p $out/bin
+      tar -C $out/bin --strip=1 -x -f $src
+    ''
+    # Replace the internal name and display name
+    + lib.strings.optionalString (protonGeTitle != null) ''
+      sed -i -r 's|"proton-cachyos-[^"]*"|"${protonGeTitle}"|g' $out/bin/compatibilitytool.vdf
+      sed -i -r 's|"display_name"[[:space:]]*"[^"]*"|"display_name" "${protonGeTitle}"|' $out/bin/compatibilitytool.vdf
+    '';
+
+  passthru.updateScript = callPackage ./update.nix { };
+
+  meta = with lib; {
+    description = "Compatibility tool for Steam Play based on Wine and additional components. CachyOS fork.";
+    homepage = "https://github.com/CachyOS/proton-cachyos";
+    license = licenses.bsd3;
+    platforms = [ "x86_64-linux" ];
+    maintainers = with maintainers; [
+      tophc7
+    ];
+  };
+}

pkgs/proton-cachyos/update.nix

@@ -0,0 +1,55 @@
+{
+  writeShellScript,
+  lib,
+  coreutils,
+  findutils,
+  gnugrep,
+  curl,
+  jq,
+  git,
+  nix,
+  nix-prefetch-git,
+  moreutils,
+  yq,
+}:
+let
+  path = lib.makeBinPath [
+    coreutils
+    curl
+    findutils
+    gnugrep
+    jq
+    moreutils
+    git
+    nix-prefetch-git
+    nix
+    yq
+  ];
+in
+writeShellScript "update-proton-cachyos" ''
+  set -euo pipefail
+  PATH=${path}
+
+  srcJson=pkgs/proton-cachyos/versions.json
+  localBase=$(jq -r .base < $srcJson)
+  localRelease=$(jq -r .release < $srcJson)
+
+  latestVer=$(curl 'https://github.com/GloriousEggroll/proton-cachyos/tags.atom' | xq -r '.feed.entry[0].link."@href"' | grep -Po '(?<=/)[^/]+$')
+
+  if [ "GE-Proton''${localBase}-''${localRelease}" == "$latestVer" ]; then
+    exit 0
+  fi
+
+  latestBase=$(echo $latestVer | grep -Po '(?<=GE-Proton)[^-]+')
+  latestRelease=$(echo $latestVer | grep -Po '(?<=-)[^-]+$')
+  latestSha256=$(nix-prefetch-url --type sha256 "https://github.com/CachyOS/proton-cachyos/releases/download/''${latestVer}/''${latestVer}.tar.gz")
+  latestHash=$(nix-hash --to-sri --type sha256 $latestSha256)
+
+  jq \
+    --arg latestBase "$latestBase" --arg latestRelease "$latestRelease" --arg latestHash "$latestHash" \
+    '.base = $latestBase | .release = $latestRelease | .hash = $latestHash' \
+    "$srcJson" | sponge "$srcJson"
+
+  git add $srcJson
+  git commit -m "proton-cachyos: ''${localBase}.''${localRelease} -> ''${latestBase}.''${latestRelease}"
+''

pkgs/proton-cachyos/versions.json

@@ -0,0 +1,5 @@
+{
+    "base": "10.0",
+    "release": "20250623",
+    "hash": "sha256-HLWWR2h+AdGfqt3Aay9Xyz7Q06NRoi3/Mp5vJtoqLlg="
+}