ubus package no longer provides systemd unit files - we should provide our own

Makefile

-all:
+all: ubus-service ubus-socket
 	tar xf ubus.tar.xz
 	patch -Np1 -d ubus < ubus-use_run.patch
 	cd ubus && cmake CMakeLists.txt -DBUILD_LUA=OFF -DCMAKE_INSTALL_PREFIX=/usr
 	$(MAKE) -C ubus
 	$(MAKE) -C ubus install
-	mv /usr/lib/systemd/system/ubus.socket /lib/systemd/system/ubus.socket
-	mv /usr/lib/systemd/system/ubus.service /lib/systemd/system/ubus.service
-	ln -s /lib/systemd/system/ubus.service /etc/systemd/system/multi-user.target.wants/ubus.service
+	@echo "$$UBUS_SERVICE" > /lib/systemd/system/ubus.service
+	systemctl enable ubus.service
+	@echo "$$UBUS_SOCKET" > /lib/systemd/system/ubus.socket
 	rm -rf ubus
+
+ubus-service:
+define UBUS_SERVICE
+[Unit]
+Description=OpenWrt micro bus
+Requires=ubus.socket
+
+[Service]
+ExecStart=/usr/sbin/ubusd
+endef
+export UBUS_SERVICE
+
+ubus-socket:
+define UBUS_SOCKET
+[Unit]
+Description=OpenWrt micro bus socket
+
+[Socket]
+ListenStream=/run/ubus.sock
+
+[Install]
+WantedBy=sockets.target
+endef
+export UBUS_SOCKET