added minecraft fabric

modules/minecraft.nix

@@ -0,0 +1,25 @@
+{ pkgs, lib, ... }:
+let
+  fabric_url = "https://meta.fabricmc.net/v2/versions/loader/1.19.2/0.14.9/0.11.1/server/jar";
+  hash = "sha1-6HYd89yETGaRE6lMqHi/PHT+wMQ=";
+  version = "1.19.2";
+  javaVersion = "17";
+in
+
+{
+
+  nixpkgs.config.allowUnfreePredicate = pkg: builtins.elem (lib.getName pkg) [ "minecraft-server" ]; #allow single unfree package
+
+  services.minecraft-server = {
+    enable = true;
+    eula = true;
+    package = pkgs.callPackage ../packages/minecraft/derivation.nix { sha1=hash; url=fabric_url; version=version; };
+    openFirewall = true;
+    jvmOpts = "-Xms4096M -Xmx4096M -XX:+UseG1GC -XX:ParallelGCThreads=2 -XX:MinHeapFreeRatio=5 -XX:MaxHeapFreeRatio=10";
+  };
+
+  environment.systemPackages = [ pkgs.mcrcon ];
+
+}
+
+# vim: set et ts=2 sw=2 ai:

packages/minecraft/derivation.nix

@@ -0,0 +1,37 @@
+{ lib, stdenv, fetchurl, nixosTests, jre_headless, version, url, sha1 }:
+stdenv.mkDerivation {
+  pname = "minecraft-server";
+  inherit version;
+
+  src = fetchurl { inherit url sha1; };
+
+  preferLocalBuild = true;
+
+  installPhase = ''
+    mkdir -p $out/bin $out/lib/minecraft
+    cp -v $src $out/lib/minecraft/server.jar
+
+    cat > $out/bin/minecraft-server << EOF
+    #!/bin/sh
+    exec ${jre_headless}/bin/java \$@ -jar $out/lib/minecraft/server.jar nogui
+    EOF
+
+    chmod +x $out/bin/minecraft-server
+  '';
+
+  dontUnpack = true;
+
+  passthru = {
+    tests = { inherit (nixosTests) minecraft-server; };
+    updateScript = ./update.py;
+  };
+
+  meta = with lib; {
+    description = "Minecraft Server";
+    homepage = "https://minecraft.net";
+    sourceProvenance = with sourceTypes; [ binaryBytecode ];
+    license = licenses.unfreeRedistributable;
+    platforms = platforms.unix;
+    maintainers = with maintainers; [ thoughtpolice tomberek costrouc jyooru ];
+  };
+}

systems/mc7/configuration.nix

@@ -5,8 +5,13 @@
       ./hardware-configuration.nix
       ./modules/generic.nix
       ./modules/borg.nix
+      ./modules/minecraft.nix
     ];
 
+ system.autoUpgrade = {
+    allowReboot = false;
+  };
+
   system.stateVersion = "22.05";
 }