NixOS: properly create the state dir

module.nix

@@ -29,16 +29,20 @@ in
         default = 9000;
         description = "Listen on this port.";
       };
+      stateDir = mkOption {
+        default = "/var/lib/strojnadzor";
+        type = types.str;
+        description = "Strojnadzor data directory.";
+      };
     };
   };
 
   config = mkIf cfg.enable {
     users.users.strojnadzor = {
       description = "Strojnadzor user";
-      createHome = true;
       isSystemUser = true;
       group = "strojnadzor";
-      home = "/var/lib/strojnadzor";
+      home = cfg.stateDir;
     };
 
     users.groups.strojnadzor = {};
@@ -46,6 +50,12 @@ in
     environment.systemPackages = [
       strojnadzor
     ];
+
+    systemd.tmpfiles.rules = [
+      "d '${cfg.stateDir}' - strojnadzor strojnadzor - -"
+      "d '${cfg.stateDir}/data' - strojnadzor strojnadzor - -"
+    ];
+
     systemd.services.strojnadzor =
       {
         description = "Strojnadzor HTTP server.";
@@ -57,7 +67,7 @@ in
           ExecStartPre = "${strojnadzor}/bin/strojnadzor-admin migrate";
           ExecStart = "${strojnadzor}/bin/strojnadzor-admin runserver-uvicorn ${cfg.hostname} ${toString cfg.port}";
         };
-        environment.STROJNADZOR_DATA_DIR = "/var/lib/strojnadzor/data";
+        environment.STROJNADZOR_DATA_DIR = "${cfg.stateDir}/data";
       };
   };
 }