systembus-notify: add module

.github/CODEOWNERS

@@ -390,6 +390,8 @@
 
 /modules/services/volnoti.nix                         @IvanMalison
 
+/modules/services/systembus-notify.nix                @asymmetric
+
 /modules/targets/darwin                               @midchildan
 /tests/modules/targets-darwin                         @midchildan
 

modules/misc/news.nix

@@ -2320,6 +2320,14 @@ in
           A new module is available: 'services.opensnitch-ui'.
         '';
       }
+
+      {
+        time = "2021-12-21T22:17:30+00:00";
+        condition = hostPlatform.isLinux;
+        message = ''
+          A new module is available: 'services.systembus-notify'.
+        '';
+      }
     ];
   };
 }

modules/modules.nix

@@ -220,6 +220,7 @@ let
     ./services/status-notifier-watcher.nix
     ./services/sxhkd.nix
     ./services/syncthing.nix
+    ./services/systembus-notify.nix
     ./services/taffybar.nix
     ./services/tahoe-lafs.nix
     ./services/taskwarrior-sync.nix

modules/services/systembus-notify.nix

@@ -0,0 +1,27 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+{
+  meta.maintainers = [ maintainers.asymmetric ];
+
+  options = {
+    services.systembus-notify = {
+      enable =
+        mkEnableOption "systembus-notify - system bus notification daemon";
+    };
+  };
+
+  config = mkIf config.services.systembus-notify.enable {
+    assertions = [
+      (hm.assertions.assertPlatform "services.systembus-notify" pkgs
+        platforms.linux)
+    ];
+
+    systemd.user.services.systembus-notify = {
+      Unit.Description = "systembus-notify daemon";
+      Install.WantedBy = [ "graphical-session.target" ];
+      Service.ExecStart = "${pkgs.systembus-notify}/bin/systembus-notify";
+    };
+  };
+}