Switch calls to use dbus library and add helpers for private connections

dbus.go

@@ -0,0 +1,37 @@
+package main
+
+import "github.com/godbus/dbus/v5"
+
+func newSystemBusConn() (*dbus.Conn, error) {
+	// Connect to dbus session bus
+	conn, err := dbus.SystemBusPrivate()
+	if err != nil {
+		return nil, err
+	}
+	err = conn.Auth(nil)
+	if err != nil {
+		return nil, err
+	}
+	err = conn.Hello()
+	if err != nil {
+		return nil, err
+	}
+	return conn, nil
+}
+
+func newSessionBusConn() (*dbus.Conn, error) {
+	// Connect to dbus session bus
+	conn, err := dbus.SessionBusPrivate()
+	if err != nil {
+		return nil, err
+	}
+	err = conn.Auth(nil)
+	if err != nil {
+		return nil, err
+	}
+	err = conn.Hello()
+	if err != nil {
+		return nil, err
+	}
+	return conn, nil
+}