Add systemd target tray.target (#2027)

This target is for systemd units that require a system tray to be
running.

This also fixes taffybar.service: previously, systemd would consider it
to be active (running) before it was actually ready to accept tray
icons.

modules/services/blueman-applet.nix

@@ -24,7 +24,8 @@ with lib;
     systemd.user.services.blueman-applet = {
       Unit = {
         Description = "Blueman applet";
-        After = [ "graphical-session-pre.target" ];
+        Requires = [ "tray.target" ];
+        After = [ "graphical-session-pre.target" "tray.target" ];
         PartOf = [ "graphical-session.target" ];
       };
 

modules/services/cbatticon.nix

@@ -103,7 +103,8 @@ in {
     systemd.user.services.cbatticon = {
       Unit = {
         Description = "cbatticon system tray battery icon";
-        After = [ "graphical-session-pre.target" ];
+        Requires = [ "tray.target" ];
+        After = [ "graphical-session-pre.target" "tray.target" ];
         PartOf = [ "graphical-session.target" ];
       };
 

modules/services/flameshot.nix

@@ -18,12 +18,8 @@ in {
     systemd.user.services.flameshot = {
       Unit = {
         Description = "Flameshot screenshot tool";
-        After = [
+        Requires = [ "tray.target" ];
-          "graphical-session-pre.target"
+        After = [ "graphical-session-pre.target" "tray.target" ];
-          "polybar.service"
-          "stalonetray.service"
-          "taffybar.service"
-        ];
         PartOf = [ "graphical-session.target" ];
       };
 

modules/services/network-manager-applet.nix

@@ -19,7 +19,8 @@ in {
     systemd.user.services.network-manager-applet = {
       Unit = {
         Description = "Network Manager applet";
-        After = [ "graphical-session-pre.target" ];
+        Requires = [ "tray.target" ];
+        After = [ "graphical-session-pre.target" "tray.target" ];
         PartOf = [ "graphical-session.target" ];
       };
 

modules/services/parcellite.nix

@@ -27,7 +27,8 @@ in {
     systemd.user.services.parcellite = {
       Unit = {
         Description = "Lightweight GTK+ clipboard manager";
-        After = [ "graphical-session-pre.target" ];
+        Requires = [ "tray.target" ];
+        After = [ "graphical-session-pre.target" "tray.target" ];
         PartOf = [ "graphical-session.target" ];
       };
 

modules/services/pasystray.nix

@@ -13,7 +13,8 @@ with lib;
     systemd.user.services.pasystray = {
       Unit = {
         Description = "PulseAudio system tray";
-        After = [ "graphical-session-pre.target" ];
+        Requires = [ "tray.target" ];
+        After = [ "graphical-session-pre.target" "tray.target" ];
         PartOf = [ "graphical-session.target" ];
       };
 

modules/services/polybar.nix

@@ -197,8 +197,7 @@ in {
     systemd.user.services.polybar = {
       Unit = {
         Description = "Polybar status bar";
-        After = [ "graphical-session-pre.target" ];
+        PartOf = [ "tray.target" ];
-        PartOf = [ "graphical-session.target" ];
         X-Restart-Triggers =
           [ "${config.xdg.configFile."polybar/config".source}" ];
       };
@@ -212,7 +211,7 @@ in {
         Restart = "on-failure";
       };
 
-      Install = { WantedBy = [ "graphical-session.target" ]; };
+      Install = { WantedBy = [ "tray.target" ]; };
     };
   };
 

modules/services/stalonetray.nix

@@ -56,11 +56,10 @@ in {
       systemd.user.services.stalonetray = {
         Unit = {
           Description = "Stalonetray system tray";
-          After = [ "graphical-session-pre.target" ];
+          PartOf = [ "tray.target" ];
-          PartOf = [ "graphical-session.target" ];
         };
 
-        Install = { WantedBy = [ "graphical-session.target" ]; };
+        Install = { WantedBy = [ "tray.target" ]; };
 
         Service = {
           ExecStart = "${cfg.package}/bin/stalonetray";

modules/services/status-notifier-watcher.nix

@@ -29,16 +29,17 @@ in {
     systemd.user.services.status-notifier-watcher = {
       Unit = {
         Description = "SNI watcher";
-        After = [ "graphical-session-pre.target" ];
+        PartOf = [ "tray.target" ];
-        PartOf = [ "graphical-session.target" ];
         Before = [ "taffybar.service" ];
       };
 
-      Service = { ExecStart = "${cfg.package}/bin/status-notifier-watcher"; };
+      Service = {
-
+        Type = "dbus";
-      Install = {
+        BusName = "org.kde.StatusNotifierWatcher";
-        WantedBy = [ "graphical-session.target" "taffybar.service" ];
+        ExecStart = "${cfg.package}/bin/status-notifier-watcher";
       };
+
+      Install = { WantedBy = [ "tray.target" "taffybar.service" ]; };
     };
   };
 }

modules/services/syncthing.nix

@@ -74,12 +74,8 @@ with lib;
           ${config.services.syncthing.tray.package.pname} = {
             Unit = {
               Description = config.services.syncthing.tray.package.pname;
-              After = [
+              Requires = [ "tray.target" ];
-                "graphical-session-pre.target"
+              After = [ "graphical-session-pre.target" "tray.target" ];
-                "polybar.service"
-                "taffybar.service"
-                "stalonetray.service"
-              ];
               PartOf = [ "graphical-session.target" ];
             };
 
@@ -100,12 +96,8 @@ with lib;
           "syncthingtray" = {
             Unit = {
               Description = "syncthingtray";
-              After = [
+              Requires = [ "tray.target" ];
-                "graphical-session-pre.target"
+              After = [ "graphical-session-pre.target" "tray.target" ];
-                "polybar.service"
-                "taffybar.service"
-                "stalonetray.service"
-              ];
               PartOf = [ "graphical-session.target" ];
             };
 

modules/services/taffybar.nix

@@ -27,16 +27,17 @@ in {
     systemd.user.services.taffybar = {
       Unit = {
         Description = "Taffybar desktop bar";
-        After = [ "graphical-session-pre.target" ];
+        PartOf = [ "tray.target" ];
-        PartOf = [ "graphical-session.target" ];
       };
 
       Service = {
+        Type = "dbus";
+        BusName = "org.taffybar.Bar";
         ExecStart = "${cfg.package}/bin/taffybar";
         Restart = "on-failure";
       };
 
-      Install = { WantedBy = [ "graphical-session.target" ]; };
+      Install = { WantedBy = [ "tray.target" ]; };
     };
 
     xsession.importedVariables = [ "GDK_PIXBUF_MODULE_FILE" ];

modules/services/udiskie.nix

@@ -77,7 +77,8 @@ in {
     systemd.user.services.udiskie = {
       Unit = {
         Description = "udiskie mount daemon";
-        After = [ "graphical-session-pre.target" ];
+        Requires = [ "tray.target" ];
+        After = [ "graphical-session-pre.target" "tray.target" ];
         PartOf = [ "graphical-session.target" ];
       };
 

modules/xsession.nix

@@ -110,12 +110,21 @@ in {
         };
       };
 
+      targets = {
         # A basic graphical session target for Home Manager.
-      targets.hm-graphical-session = {
+        hm-graphical-session = {
           Unit = {
             Description = "Home Manager X session";
             Requires = [ "graphical-session-pre.target" ];
-          BindsTo = [ "graphical-session.target" ];
+            BindsTo = [ "graphical-session.target" "tray.target" ];
+          };
+        };
+
+        tray = {
+          Unit = {
+            Description = "Home Manager System Tray";
+            Requires = [ "graphical-session-pre.target" ];
+          };
         };
       };
     };