even more backups of things

hosts/lithium/services/game_servers.nix

@@ -0,0 +1,42 @@
+{ pkgs, ... }:
+{
+  # TODO
+  # systemd.services.<name>.serviceConfig.{MemoryMax,CPUQuota}
+  systemd.services.valheim-server = {
+    description = "Valheim dedicated server";
+    after = [ "network.target" ];
+    wantedBy = [ "multi-user.target" ];
+  };
+
+  serviceConfig = {
+    Type = "simple";
+    User = "valheim";
+    Group = "valheim";
+    ExecStart = "${pkgs.steamcmd}/bin/steamcmd +login anonymous +force_install_dir /home/valheim/server +app_update 896660 validate +exit && /home/valheim/server/valheim_server.x86_64";
+  };
+
+  users.users.valheim = {
+    isSystemUser = true;
+    group = "valheim";
+    home = "/home/valheim";
+  };
+  users.groups.valheim = {};
+
+  networking.firewall = {
+    allowedTCPPorts = [ 7777 2456 ];
+    allowedUDPPorts = [ 7777 2457 ];
+  };
+
+  services.restic.backups.gameservers = {
+    user = "root";
+    # TODO: Pick a real backup directory.
+    repository = "/backup/gameservers";
+    paths = [
+      "/var/lib/terraria"
+      "/home/valheim/server"
+    ];
+    timeConfig = {
+      OnCalendar = "daily";
+    };
+  };
+}