Packaged with Nix

build.nix

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+{ callPackage
+, symlinkJoin
+, fetchurl
+, makeDesktopItem
+, copyDesktopItems
+, hl2-unwrapped ? callPackage ./hl2-unwrapped.nix { }
+, hl2-wrapper ? callPackage ./hl2-wrapper.nix { inherit hl2-unwrapped; }
+}:
+
+let
+  name = "hl2";
+
+  icon = fetchurl {
+    url = "https://upload.wikimedia.org/wikipedia/commons/1/14/Half-Life_2_Logo.svg";
+    hash = "sha256-/4GlYVAUSZiK7eLjM/HymcGphk5s2uCPOQuB1XOstuI=";
+  };
+in
+symlinkJoin rec{
+  inherit name;
+
+  paths = [ 
+    hl2-unwrapped
+    hl2-wrapper
+  ] ++ desktopItems;
+
+  nativeBuildInputs = [
+    copyDesktopItems
+  ];
+
+  postBuild = ''
+    ln -s $out/bin/hl2-wrapper $out/bin/${name}
+
+    install -Dm444 ${icon} $out/share/icons/hicolor/scalable/apps/${name}.svg
+  '';
+
+  desktopItems = [
+    (makeDesktopItem {
+      name = "${name}";
+      exec = "${name}";
+      icon = "${name}";
+      desktopName = "Half-Life 2";
+      comment = "Built from the leaked source code";
+      categories = [ "Game" ];
+    })
+  ];
+}

flake.nix

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+{
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs";
+    flake-utils.url = "github:numtide/flake-utils";
+
+    ivp-submodule = {
+      url = "github:nillerusr/source-physics";
+      flake = false;
+    };
+
+    lib-submodule = {
+      url = "github:nillerusr/source-engine-libs";
+      flake = false;
+    };
+
+    thirdparty-submodule = {
+      url = "github:nillerusr/source-thirdparty";
+      flake = false;
+    };
+  };
+
+  outputs = { self, nixpkgs, flake-utils, ... }@inputs:
+  flake-utils.lib.eachDefaultSystem (system:
+    let
+      pkgs = import nixpkgs { inherit system; };
+
+      # Fix for git submodules
+      hl2-unwrapped = (pkgs.callPackage ./hl2-unwrapped.nix { }).overrideAttrs {
+        postPatch = ''
+          rm -rf ./{ivp,lib,thirdparty}
+          ln -s ${inputs.ivp-submodule} ./ivp
+          ln -s ${inputs.lib-submodule} ./lib
+          ln -s ${inputs.thirdparty-submodule} ./thirdparty
+        '';
+      };
+    in
+    {
+      # Install the game on your own computer
+      packages = {
+        hl2 = pkgs.callPackage ./build.nix { inherit hl2-unwrapped; };
+        default = self.packages.${system}.hl2;
+      };
+
+      # Build the game for others
+      devShells.default = pkgs.mkShell rec {
+        nativeBuildInputs = with pkgs; [
+          makeWrapper
+          SDL2
+          freetype
+          fontconfig
+          zlib
+          bzip2
+          libjpeg
+          libpng
+          curl
+          openal
+          libopus
+          pkg-config
+          gcc
+          python3
+        ];
+      };
+    }
+  );
+}

hl2-unwrapped.nix

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+{ stdenv
+, python3
+, wafHook
+, callPackage
+, SDL2
+, freetype
+, fontconfig
+, zlib
+, bzip2
+, libjpeg
+, libpng
+, curl
+, openal
+, libopus
+, pkg-config
+, gcc
+, extraWafConfigureFlags ? [ ]
+}:
+
+stdenv.mkDerivation {
+  pname = "hl2";
+  version = "1.0";
+
+  src = ./.;
+
+  nativeBuildInputs = [
+    python3
+    SDL2
+    freetype
+    fontconfig
+    zlib
+    bzip2
+    libjpeg
+    libpng
+    curl
+    openal
+    libopus
+    pkg-config
+    gcc
+    wafHook
+  ];
+
+  wafConfigureFlags = [
+    "-T fastnative"
+    "--disable-warns"
+    "--build-flags=-Wno-error=format-security"
+  ] ++ extraWafConfigureFlags;
+}

hl2-wrapper.nix

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+{ writeShellScriptBin
+, getopt
+, xorg
+, hl2-unwrapped
+}:
+
+writeShellScriptBin "hl2-wrapper" ''
+  config_path=$HOME/.config/hl2/config
+  default_resource_path=$HOME/hl2
+
+  longoptions="resource-path:,impermanent,help"
+  shortoptions="r:h"
+
+  impermanent=false
+
+  usage() {
+    echo "hl2(-wrapper) usage:"
+    echo "Define resource_path variable in $config_path, with the argument shown below or put resource files in $default_resource_path."
+    grep ' \+-.*) ' $0 | sed 's/#//' | sed -r 's/([a-z])\)/\1/'
+    exit 0
+  }
+
+  # Just in case
+  save_newly_created_files() {
+    newly_created_files=$(cd $tmp_dir && find . -type f | cut -c 2-)
+
+    echo "$newly_created_files" | while read file;
+    do
+      cp $tmp_dir$file $resource_path$file
+    done
+  }
+
+  cleanup() {
+    if ! $impermanent; then
+      save_newly_created_files
+    fi
+
+    rm -rf $tmp_dir
+  }
+
+  if [[ -e $config_path ]]
+  then
+    source $config_path
+  fi
+
+  parsed=$(${getopt}/bin/getopt -l $longoptions -o $shortoptions -a -- "$@")
+
+  eval set -- "$parsed"
+
+  while true; do
+    case "$1" in
+      -r | --resource-path) 	# Defines resources folder path
+        resource_path="$2"
+	shift 2
+        ;;
+      -p | --parameters)	# Sets parameters passed to hl2 launcher (encapsulated with quotes)
+        launcher_parameters="$2"
+        shift 2
+        ;;
+      --impermanent) 		# Don't save newly created files that are not in symlimked folders (you probably don't want to use this)
+        impermanent=true
+	shift 1
+	;;
+      -h | --help) 		# Get help
+	usage
+        exit 0
+        ;;
+      --)
+	shift
+	break
+	;;
+      *)
+        echo "Wrong argument: $1"
+	usage
+	exit 1
+	;;
+    esac
+  done
+
+  if [[ ! $resource_path ]]
+  then
+    echo "The path to Half-Life 2 resource folder is not set either in a config file or with an argument. Looking for resource files in the standard directory (~/hl2)."
+    resource_path=$default_resource_path
+  fi
+
+  if [[ ! -d $resource_path ]]
+  then
+    echo "$resource_path doesn't exist. Set a proper resource path."
+    exit 1
+  elif [[ ! -d $resource_path/hl2 || ! -d $resource_path/platform ]]
+  then
+    echo "$resource_path doesn't contain 'hl2' and/or 'platform' folder. Set a proper resource path."
+    exit 1
+  fi
+
+  tmp_dir=$(mktemp -d)
+  echo $tmp_dir
+
+  mkdir $tmp_dir/{hl2,platform}
+  ln -s $resource_path/hl2/* $tmp_dir/hl2/
+  ln -s $resource_path/platform/* $tmp_dir/platform/
+  rm -rf $tmp_dir/hl2/bin
+
+  ${xorg.lndir}/bin/lndir "${hl2-unwrapped}" $tmp_dir
+
+  trap cleanup EXIT
+
+  ( cd $tmp_dir ; ./hl2_launcher $launcher_parameters )
+''