app/dbus: manage dbus proxy and pass address to child

This commit adds code that starts and registers the D-Bus proxy, as well as cleanup code that tracks and closes the daemon once our child exits. A few more flags were added to pass D-Bus config to xdg-dbus-proxy.

Signed-off-by: Ophestra Umiker <cat@ophivana.moe>

internal/state/exit.go

@@ -65,4 +65,23 @@ func BeforeExit() {
 			fmt.Printf("Stripped ACL entry for user '%s' from '%s'\n", u.Username, candidate)
 		}
 	}
+
+	if dbusProxy != nil {
+		if system.V.Verbose {
+			fmt.Println("D-Bus proxy registered, cleaning up")
+		}
+
+		if err := dbusProxy.Close(); err != nil {
+			if errors.Is(err, os.ErrClosed) {
+				if system.V.Verbose {
+					fmt.Println("D-Bus proxy already closed")
+				}
+			} else {
+				fmt.Println("Error closing D-Bus proxy:", err)
+			}
+		}
+
+		// wait for Proxy.Wait to return
+		<-*dbusDone
+	}
 }

internal/state/register.go

@@ -1,9 +1,14 @@
 package state
 
+import "git.ophivana.moe/cat/fortify/dbus"
+
 var (
 	cleanupCandidate  []string
 	enablements       *Enablements
 	xcbActionComplete bool
+
+	dbusProxy *dbus.Proxy
+	dbusDone  *chan struct{}
 )
 
 func RegisterRevertPath(p string) {
@@ -23,3 +28,8 @@ func XcbActionComplete() {
 	}
 	xcbActionComplete = true
 }
+
+func RegisterDBus(p *dbus.Proxy, done *chan struct{}) {
+	dbusProxy = p
+	dbusDone = done
+}