home: rbw: add a service

home/rbw.nix

@@ -25,5 +25,28 @@ in {
         pinentry = pkgs.pinentry-gnome;
       };
     };
+
+    # `rbw-agent` should be launched on first call to `rbw`, so this shouldn't
+    # be necessary.
+    #
+    # However, if for instance `rbw` if first called by the emacs-daemon (when
+    # accessing an IMAP account password), then restarting the user service
+    # associated to the emacs daemon also kills the rbw-agent it spawned,
+    # resetting the lock status and prompting for a passphrase again.
+    #
+    # This user service makes sure the rbw-agent is started when the user
+    # session launches.
+    systemd.user.services.rbw = {
+      Unit.Description = "rbw agent autostart";
+
+      Install.WantedBy = ["default.target"];
+
+      Service = {
+        ExecStart = "${pkgs.rbw}/bin/rbw-agent";
+        Restart = "on-abort";
+        Type = "forking";
+        PIDFile = "%t/rbw/pidfile";
+      };
+    };
   };
 }