nixos/govee2mqtt: init

nixos/modules/module-list.nix

@@ -576,6 +576,7 @@
   ./services/home-automation/ebusd.nix
   ./services/home-automation/esphome.nix
   ./services/home-automation/evcc.nix
+  ./services/home-automation/govee2mqtt.nix
   ./services/home-automation/home-assistant.nix
   ./services/home-automation/homeassistant-satellite.nix
   ./services/home-automation/zigbee2mqtt.nix

nixos/modules/services/home-automation/govee2mqtt.nix

@@ -0,0 +1,90 @@
+{ config, lib, pkgs, ... }:
+
+let
+  cfg = config.services.govee2mqtt;
+in {
+  meta.maintainers = with lib.maintainers; [ SuperSandro2000 ];
+
+  options.services.govee2mqtt = {
+    enable = lib.mkEnableOption "Govee2MQTT";
+
+    package = lib.mkPackageOption pkgs "govee2mqtt" { };
+
+    user = lib.mkOption {
+      type = lib.types.str;
+      default = "govee2mqtt";
+      description = "User under which Govee2MQTT should run.";
+    };
+
+    group = lib.mkOption {
+      type = lib.types.str;
+      default = "govee2mqtt";
+      description = "Group under which Govee2MQTT should run.";
+    };
+
+    environmentFile = lib.mkOption {
+      type = lib.types.path;
+      example = "/var/lib/govee2mqtt/govee2mqtt.env";
+      description = ''
+        Environment file as defined in {manpage}`systemd.exec(5)`.
+
+        See upstream documentation <https://github.com/wez/govee2mqtt/blob/main/docs/CONFIG.md>.
+      '';
+    };
+  };
+
+  config = lib.mkIf cfg.enable {
+    users = {
+      groups.${cfg.group} = { };
+      users.${cfg.user} = {
+        description = "Govee2MQTT service user";
+        inherit (cfg) group;
+        isSystemUser = true;
+      };
+    };
+
+    systemd.services.govee2mqtt = {
+      description = "Govee2MQTT Service";
+      wantedBy = [ "multi-user.target" ];
+      after = [ "networking.target" ];
+      serviceConfig = {
+        CacheDirectory = "govee2mqtt";
+        Environment = [
+          "GOVEE_CACHE_DIR=/var/cache/govee2mqtt"
+        ];
+        EnvironmentFile = cfg.environmentFile;
+        ExecStart = "${lib.getExe cfg.package} serve --govee-iot-key=/var/lib/govee2mqtt/iot.key --govee-iot-cert=/var/lib/govee2mqtt/iot.cert"
+          + " --amazon-root-ca=${pkgs.cacert.unbundled}/etc/ssl/certs/Amazon_Root_CA_1:66c9fcf99bf8c0a39e2f0788a43e696365bca.crt";
+        Group = cfg.group;
+        Restart = "on-failure";
+        StateDirectory = "govee2mqtt";
+        User = cfg.user;
+
+        # Hardening
+        AmbientCapabilities = "";
+        CapabilityBoundingSet = "";
+        LockPersonality = true;
+        NoNewPrivileges = true;
+        PrivateDevices = true;
+        PrivateMounts = true;
+        PrivateTmp = true;
+        PrivateUsers = true;
+        ProcSubset = "pid";
+        ProtectClock = true;
+        ProtectControlGroups = true;
+        ProtectHome = true;
+        ProtectHostname = true;
+        ProtectKernelLogs = true;
+        ProtectKernelModules = true;
+        ProtectKernelTunables = true;
+        ProtectProc = "invisible";
+        ProtectSystem = "strict";
+        RemoveIPC = true;
+        RestrictNamespaces = true;
+        RestrictRealtime = true;
+        RestrictSUIDSGID = true;
+        SystemCallArchitectures = "native";
+      };
+    };
+  };
+}