doctor: use dbus for checking on services

core/internal/utils/dbus.go

@@ -0,0 +1,20 @@
+package utils
+
+import (
+	"github.com/godbus/dbus/v5"
+)
+
+func IsDBusServiceAvailable(busName string) bool {
+	conn, err := dbus.ConnectSystemBus()
+	if err != nil {
+		return false
+	}
+	defer conn.Close()
+
+	obj := conn.Object("org.freedesktop.DBus", "/org/freedesktop/DBus")
+	var owned bool
+	if err := obj.Call("org.freedesktop.DBus.NameHasOwner", 0, busName).Store(&owned); err != nil {
+		return false
+	}
+	return owned
+}