Update README.md

Signed-off-by: Luca Di Maio <[email protected]>

README.md

@@ -19,29 +19,39 @@ sudo make install
 
 **Transactional Update Notifier** should be run as a user's Systemd unit. 
 
-``` bash
-transactional-update-notifier daemon
+This will wait for messages over dbus at `org.opensuse.tukit.Updated` and trigger the graphical
+notification when receiving the signal.
+
+Graphical notifications are performed using user's dbus session.
+
+``` console
+~$: transactional-update-notifier daemon
 ```
 
 Or using `systemctl`:
 
-``` bash
-systemctl --user enable --now transactional-update-notifier
+``` console
+~$: systemctl --user enable --now transactional-update-notifier
 ```
 
 **Note:** After installing **Transactional Update Notifier** using `make`, the
 `96-transactional-update-notifier.preset` preset file should enable the unit
 service by default on next boot and all you needed to do is to start it with:
 
 ``` bash
-systemctl --user start transactional-update-notifier
+~$: systemctl --user start transactional-update-notifier
 ```
 
 ### Client
 
 **Transactional Update Notifier** can be run from anywhere and executed by anyone,
-it will find the notifier socket and notify the user.
+it will send messages over dbus on `org.opensuse.tukit.Updated` and all listening services
+will trigger a graphical notification.
 
-``` bash
-transactional-update-notifier client
+``` console
+~#: transactional-update-notifier client
 ```
+
+Be aware that the file `org.opensuse.tukit.Updated.conf` should be put into `/etc/dbus-1/system.d/` in
+order to protect the `org.opensuse.tukit.Updated` name and allow only `root` to emit signals on this
+interface.

client.go

@@ -5,9 +5,8 @@ import (
 	"github.com/godbus/dbus/v5"
 )
 
-// NotifyDaemonClient will search througt all files in /run/user, to find all
-// running transactionalupdatenotification socket files, then send a message
-// to each one of them in order to trigger the notification for all.
+// NotifyDaemonClient will emit a message on org.opensuse.tukit.Updated
+// so each one of the user-facing service will trigger the graphical notification.
 func NotifyDaemonClient(success string) {
 	conn, err := dbus.SystemBus()
 	if err != nil {

daemon.go

@@ -62,6 +62,8 @@ func notify(input string) {
 	}
 }
 
+// NotifyDaemon will wait for a message on org.opensuse.tukit.Updated and trigger
+// a graphical notification accordingly.
 func NotifyDaemon() {
 	conn, err := dbus.SystemBus()
 	if err != nil {