FAST MINECRAFT SØRVER

services/minecraft/default.nix

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+{config, lib, pkgs, ... }:
+
+{
+
+  imports = [ ./minecraft-server-fabric.nix ];
+
+  pvv.minecraft-server-fabric = {
+    enable = true;
+    eula = true;
+
+    package = pkgs.callPackage ../../pkgs/minecraft-server-fabric { inherit (pkgs.unstable) minecraft-server; };
+    jvmOpts = "-Xms10G -Xmx10G -XX:+UnlockExperimentalVMOptions -XX:+UseZGC  -XX:+DisableExplicitGC  -XX:+AlwaysPreTouch -XX:+ParallelRefProcEnabled";
+
+    serverProperties = {
+      view-distance = 32;
+      gamemode = 1;
+      enable-rcon = true;
+      "rcon.password" = "pvv";
+    };
+
+    dataDir = "/fast/minecraft-fabric";
+
+    mods = [
+      (pkgs.fetchurl { # Fabric API is a common dependency for fabric based mods
+        url = "https://cdn.modrinth.com/data/P7dR8mSH/versions/0.44.0+1.18/fabric-api-0.44.0+1.18.jar";
+        sha256 = "0mlmj7mj073a48s8zgc1km0jwkphz01c1fvivn4mw37lbm2p4834";
+      })
+      (pkgs.fetchurl { # Lithium is a 100% vanilla compatible optimization mod
+        url = "https://cdn.modrinth.com/data/gvQqBUqZ/versions/mc1.18.1-0.7.6/lithium-fabric-mc1.18.1-0.7.6.jar";
+        sha256 = "1fw1ikg578v4i6bmry7810a3q53h8yspxa3awdz7d746g91g8lf7";
+      })
+      (pkgs.fetchurl { # Starlight is the lighting engine of papermc
+        url = "https://cdn.modrinth.com/data/H8CaAYZC/versions/Starlight%201.0.0%201.18.x/starlight-1.0.0+fabric.d0a3220.jar";
+        sha256 = "0bv9im45hhc8n6x57lakh2rms0g5qb7qfx8qpx8n6mbrjjz6gla1";
+      })
+      (pkgs.fetchurl { # Krypton is a linux optimized optimizer for minecrafts networking system
+        url = "https://cdn.modrinth.com/data/fQEb0iXm/versions/0.1.6/krypton-0.1.6.jar";
+        sha256 = "1ribvbww4msrfdnzlxipk8kpzz7fnwnd4q6ln6mpjlhihcjb3hni";
+      })
+      (pkgs.fetchurl { # C2ME is a parallelizer for chunk loading and generation, experimental!!!
+        url = "https://cdn.modrinth.com/data/VSNURh3q/versions/0.2.0+alpha.5.104%201.18.1/c2me-fabric-mc1.18.1-0.2.0+alpha.5.104-all.jar";
+        sha256 = "13zrpsg61fynqnnlm7dvy3ihxk8khlcqsif68ak14z7kgm4py6nw";
+      })
+      (pkgs.fetchurl { # Spark is a profiler for minecraft
+        url = "https://ci.lucko.me/job/spark/251/artifact/spark-fabric/build/libs/spark-fabric.jar";
+        sha256 = "1clvi5v7a14ba23jbka9baz99h6wcfjbadc8kkj712fmy2h0sx07";
+      })
+      (pkgs.fetchurl { # Carpetmod gives you tps views in the tab menu,
+        # but also adds a lot of optional serverside vanilla+ features (which we arent using).
+        # So probably want something else
+        url = "https://github.com/gnembon/fabric-carpet/releases/download/1.4.56/fabric-carpet-1.18-1.4.56+v211130.jar";
+        sha256 = "0rvl2yb8xymla8c052j07gqkqfkz4h5pxf6aip2v9v0h8r84p9hf";
+      })
+    ];
+  };
+
+  networking.firewall.allowedTCPPorts = [ 25565 ];
+  networking.firewall.allowedUDPPorts = [ 25565 ];
+
+  systemd.services."minecraft-backup" = {
+    serviceConfig.Type = "oneshot";
+    script = ''
+      ${pkgs.mcrcon}/bin/mcrcon -p pvv "say Starting Backup" "save-off" "save-all"
+      ${pkgs.rsync}/bin/rsync -avz --delete ${config.pvv.minecraft-server-fabric.dataDir}/world /fast/backup # Where to put backup
+      ${pkgs.mcrcon}/bin/mcrcon -p pvv "save-all" "say Completed Backup" "save-on" "save-all"
+    '';
+  };
+
+  systemd.timers."minecraft-backup" = {
+    wantedBy = ["timers.target"];
+    timerConfig.OnCalendar = [ "hourly" ];
+  };
+
+}

services/minecraft/minecraft-server-fabric.nix

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+{ lib, pkgs, config, ... }:
+
+with lib;
+
+let
+  cfg = config.pvv.minecraft-server-fabric;
+  
+  # We don't allow eula=false anyways
+  eulaFile = builtins.toFile "eula.txt" ''
+    # eula.txt managed by NixOS Configuration
+    eula=true
+  '';
+  
+  whitelistFile = pkgs.writeText "whitelist.json"
+    (builtins.toJSON
+      (mapAttrsToList (n: v: { name = n; uuid = v; }) cfg.whitelist));
+
+  cfgToString = v: if builtins.isBool v then boolToString v else toString v;
+  
+  serverPropertiesFile = pkgs.writeText "server.properties" (''
+    # server.properties managed by NixOS configuration
+  '' + concatStringsSep "\n" (mapAttrsToList
+    (n: v: "${n}=${cfgToString v}") cfg.serverProperties));
+  
+  defaultServerPort = 25565;
+
+  serverPort = cfg.serverProperties.server-port or defaultServerPort;
+
+  rconPort = if cfg.serverProperties.enable-rcon or false
+    then cfg.serverProperties."rcon.port" or 25575
+    else null;
+
+  queryPort = if cfg.serverProperties.enable-query or false
+    then cfg.serverProperties."query.port" or 25565
+    else null;
+
+in
+{
+
+  options.pvv.minecraft-server-fabric = {
+    enable = mkEnableOption "minecraft-server-fabric";
+
+    package = mkOption {
+      type = types.package;
+    };
+
+    eula = mkOption {
+      type = types.bool;
+      default = false;
+      description = ''
+        Whether you agree to
+        <link xlink:href="https://account.mojang.com/documents/minecraft_eula">
+        Mojangs EULA</link>. This option must be set to
+        <literal>true</literal> to run Minecraft server.
+      '';
+    };
+
+    dataDir = mkOption {
+      type = types.path;
+      default = "/var/lib/minecraft-fabric";
+      description = ''
+        Directory to store Minecraft database and other state/data files.
+      '';
+    };
+
+
+    whitelist = mkOption {
+      type = let
+        minecraftUUID = types.strMatching
+          "[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}" // {
+            description = "Minecraft UUID";
+          };
+        in types.attrsOf minecraftUUID;
+      default = {};
+      description = ''
+        Whitelisted players, only has an effect when
+        <option>services.minecraft-server.declarative</option> is
+        <literal>true</literal> and the whitelist is enabled
+        via <option>services.minecraft-server.serverProperties</option> by
+        setting <literal>white-list</literal> to <literal>true</literal>.
+        This is a mapping from Minecraft usernames to UUIDs.
+        You can use <link xlink:href="https://mcuuid.net/"/> to get a
+        Minecraft UUID for a username.
+      '';
+      example = literalExpression ''
+        {
+          username1 = "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx";
+          username2 = "yyyyyyyy-yyyy-yyyy-yyyy-yyyyyyyyyyyy";
+        };
+      '';
+    };
+
+    serverProperties = mkOption {
+      type = with types; attrsOf (oneOf [ bool int str ]);
+      default = {};
+      example = literalExpression ''
+        {
+          server-port = 43000;
+          difficulty = 3;
+          gamemode = 1;
+          max-players = 5;
+          motd = "NixOS Minecraft server!";
+          white-list = true;
+          enable-rcon = true;
+          "rcon.password" = "hunter2";
+        }
+      '';
+      description = ''
+        Minecraft server properties for the server.properties file. Only has
+        an effect when <option>services.minecraft-server.declarative</option>
+        is set to <literal>true</literal>. See
+        <link xlink:href="https://minecraft.gamepedia.com/Server.properties#Java_Edition_3"/>
+        for documentation on these values.
+      '';
+    };
+
+    jvmOpts = mkOption {
+      type = types.separatedString " ";
+      default = "-Xmx2048M -Xms2048M";
+      # Example options from https://minecraft.gamepedia.com/Tutorials/Server_startup_script
+      example = "-Xmx2048M -Xms4092M -XX:+UseG1GC -XX:+CMSIncrementalPacing "
+        + "-XX:+CMSClassUnloadingEnabled -XX:ParallelGCThreads=2 "
+        + "-XX:MinHeapFreeRatio=5 -XX:MaxHeapFreeRatio=10";
+      description = "JVM options for the Minecraft server.";
+    };
+
+    mods = mkOption {
+      type = types.listOf types.package;
+      example = literalExpression ''
+        [
+          (pkgs.fetchurl {
+            url = "https://cdn.modrinth.com/data/P7dR8mSH/versions/0.44.0+1.18/fabric-api-0.44.0+1.18.jar";
+            sha256 = "0mlmj7mj073a48s8zgc1km0jwkphz01c1fvivn4mw37lbm2p4834";
+          })
+        ];
+      '';
+      description = "List of mods to put in the mods folder";
+    };
+  };
+
+  config = mkIf cfg.enable {
+    users.users.minecraft = {
+      description     = "Minecraft server service user";
+      home            = cfg.dataDir;
+      createHome      = true;
+      isSystemUser    = true;
+      group           = "minecraft";
+    };
+    users.groups.minecraft = {};
+
+    systemd.services.minecraft-server-fabric = {
+      description   = "Minecraft Server Service";
+      wantedBy      = [ "multi-user.target" ];
+      after         = [ "network.target" ];
+
+      serviceConfig = {
+        ExecStart = "${cfg.package}/bin/minecraft-server ${cfg.jvmOpts}";
+        Restart = "always";
+        User = "minecraft";
+        WorkingDirectory = cfg.dataDir;
+      };
+
+      preStart = ''
+        ln -sf ${eulaFile} eula.txt
+        ln -sf ${whitelistFile} whitelist.json
+        cp -f ${serverPropertiesFile} server.properties
+
+        ln -sfn ${pkgs.linkFarmFromDrvs "fabric-mods" cfg.mods} mods
+      '';
+    };
+
+    assertions = [
+      { assertion = cfg.eula;
+        message = "You must agree to Mojangs EULA to run minecraft-server."
+          + " Read https://account.mojang.com/documents/minecraft_eula and"
+          + " set `services.minecraft-server.eula` to `true` if you agree.";
+      }
+    ]; 
+  };
+}