module.nix: add logLevel option

nix/module.nix

@@ -30,6 +30,12 @@ in {
       default = { };
       description = "Configuration settings for Roowho2.";
     };
+
+    logLevel = lib.mkOption {
+      type = lib.types.enum [ "quiet" "info" "debug" "trace" ];
+      default = "info";
+      description = "Log level for the roowho2 daemon.";
+    };
   };
 
   config = lib.mkIf cfg.enable {
@@ -55,6 +61,7 @@ in {
     };
 
     systemd.services.roowho2 = {
+      environment.RUST_LOG = cfg.logLevel;
       serviceConfig = {
         Type = "notify";
         ExecStart = "${lib.getExe' cfg.package "roowhod"} --config ${format.generate "roowho2-config.toml" cfg.settings}";

nix/vm.nix

@@ -48,6 +48,7 @@ nixpkgs.lib.nixosSystem {
 
       services.roowho2 = {
         enable = true;
+        logLevel = "debug";
       };
 
       programs.vim = {