openntpd: add systemd unit file

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/openntpd/ntpd.service

@@ -0,0 +1,11 @@
+[Unit]
+Description=OpenNTP Daemon
+After=network.target
+Conflicts=systemd-timesyncd.service
+
+[Service]
+Type=simple
+ExecStart=/usr/sbin/ntpd -s -d
+
+[Install]
+WantedBy=multi-user.target

package/openntpd/openntpd.mk

@@ -9,6 +9,14 @@ OPENNTPD_SITE = http://ftp.openbsd.org/pub/OpenBSD/OpenNTPD
 OPENNTPD_LICENSE = MIT-like, BSD-2c, BSD-3c
 OPENNTPD_LICENSE_FILES = COPYING
 
+define OPENNTPD_INSTALL_INIT_SYSTEMD
+	$(INSTALL) -D -m 0644 package/openntpd/ntpd.service \
+		$(TARGET_DIR)/etc/systemd/system/ntpd.service
+	mkdir -p $(TARGET_DIR)/etc/systemd/system/multi-user.target.wants
+	ln -fs ../ntpd.service \
+		$(TARGET_DIR)/etc/systemd/system/multi-user.target.wants/ntpd.service
+endef
+
 define OPENNTPD_INSTALL_INIT_SYSV
 	$(INSTALL) -m 0755 -D package/openntpd/S49ntp \
 		$(TARGET_DIR)/etc/init.d/S49ntp