Add flake.nix to packaging

Co-authored-by: behe <[email protected]>

README.md

@@ -110,6 +110,26 @@ You will need to add `$HOME/.local/bin` in your `$PATH` to be able to run umu th
 export PATH="$HOME/.local/bin:$PATH"
 ```
 
+# Packages:  
+## NixOS
+if you want to add umu-launcher as a flake add this to your inputs in flake.nix
+```nix
+  inputs = {
+    umu= {
+      url = "git+https://github.com/Open-Wine-Components/umu-launcher/?dir=packaging\/nix&submodules=1";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+  }
+```
+and in your configuration.nix
+```nix
+{inputs, pkgs, ... }:
+{
+  environment.systemPackages = [  inputs.umu.packages.${pkgs.system}.umu  ];
+}
+```
+if there is any problem with the flake feel free to open a bug report and tag any of the maintainers
+> maintainers: @beh-10257
 
 # Usage notes:  
 

packaging/nix/combine.nix

@@ -0,0 +1,11 @@
+{ env, package, symlinkJoin }:
+symlinkJoin {
+  name = "umu-combine";
+  paths = [
+    env
+    package
+  ];
+  postBuild = ''
+    rm $out/bin/umu-run
+  '';
+}

packaging/nix/flake.nix

@@ -0,0 +1,13 @@
+{
+  description = "umu universal game launcher";
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+  };
+  outputs = { self, nixpkgs }:
+  let
+    umu-package = nixpkgs.legacyPackages.x86_64-linux.callPackage ./umu-launcher.nix { umu-launcher=( builtins.toPath "${self}/../../"); };
+    umu-run = nixpkgs.legacyPackages.x86_64-linux.callPackage ./umu-run.nix { package=umu-package; };
+  in{
+    packages.x86_64-linux.umu = nixpkgs.legacyPackages.x86_64-linux.callPackage ./combine.nix { env=umu-run; package=umu-package; };
+  };
+}

packaging/nix/umu-launcher.nix

@@ -0,0 +1,16 @@
+{stdenv , umu-launcher, pkgs, ...}:
+stdenv.mkDerivation {
+  pname = "umu-launcher";
+  version = "0.1";
+  src = umu-launcher;
+  depsBuildBuild = [
+    pkgs.meson
+    pkgs.ninja
+    pkgs.scdoc
+  ];
+  dontUseMesonConfigure = true;
+  dontUseNinjaBuild = true;
+  dontUseNinjaInstall = true;
+  dontUseNinjaCheck = true;
+  configureScript = "./configure.sh";
+}

packaging/nix/umu-run.nix

@@ -0,0 +1,14 @@
+{ package, lib,stdenv, buildFHSEnv, writeShellScript, ...}:
+let
+  ldPath = lib.optionals stdenv.is64bit [ "/lib64" ] ++ [ "/lib32" ];
+  exportLDPath = ''
+    export LD_LIBRARY_PATH=${lib.concatStringsSep ":" ldPath}''${LD_LIBRARY_PATH:+:}$LD_LIBRARY_PATH
+  '';
+in
+buildFHSEnv {
+  name = "umu";
+  runScript = writeShellScript "umu-env" ''
+    ${exportLDPath}
+    ${package}/bin/umu-run "$@"
+  '';
+}