Initial flake commit

lib/default.nix

@@ -43,6 +43,8 @@ with lib; {
     ./fudo/webmail.nix
     ./fudo/wireless-networks.nix
 
+    ./fudo/games/valheim.nix
+
     ./informis/cl-gemini.nix
   ];
 }

lib/fudo/games/default.nix

@@ -0,0 +1,5 @@
+{ ... }:
+
+{
+  imports = [ ./valheim.nix ];
+}

lib/fudo/games/valheim.nix

@@ -0,0 +1,63 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+let cfg = config.fudo.games.valheim;
+in {
+  options.fudo.games.valheim = with types; {
+    enable = mkEnableOption "Enable dedicated Valheim server.";
+
+    state-directory = mkOption {
+      type = str;
+      description = "Directory at which to store Valheim state data.";
+      default = "/var/lib/valheim";
+    };
+
+    port = mkOption {
+      type = port;
+      description = "Port on which to listen for connections.";
+      default = 2456;
+    };
+
+    password = mkOption {
+      type = str;
+      description = "Password required by connecting users.";
+    };
+  };
+
+  config = mkIf cfg.enable {
+    users.users.valheim = {
+      home = cfg.state-directory;
+      createHome = true;
+      isSystemUser = true;
+    };
+
+    systemd.services.fudo-valheim = {
+      wantedBy = [ "multi-user.target" ];
+      serviceConfig = {
+        ExecStartPre = ''
+          [[ -d ${cfg.state-directory}/state ]] || mkdir ${cfg.state-directory}/state
+          ${pkgs.steamcmd}/bin/steamcmd \
+            +login anonymous \
+            +force_install_dir ${cfg.state-directory}/state \
+            +app_update 896660 \
+            +quit
+        '';
+
+        ExecStart = ''
+          ${pkgs.glibc}/lib/ld-linux-x86-64.so.2 ./valheim_server.x86_64 \
+            -name "CoCo Valheim" \
+            -port ${toString cfg.port} \
+            -world "Dedicated" \
+            -password ${cfg.password} \
+            -public 1
+        '';
+        Nice = -5;
+        Restart = "always";
+        User = "valheim";
+        StateDirectory = "${cfg.state-directory}/state";
+        WorkingDirectory = cfg.state-directory;
+      };
+      environment = { LD_LIBRARY_PATH = "linux64:${pkgs.glibc}/lib"; };
+    };
+  };
+}