olsr: systemd support

[Thomas: use relative symlink instead of absolute symlink]

Signed-off-by: Alex Suykov <alex.suykov@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/olsr/olsr.mk

@@ -40,4 +40,12 @@ define OLSR_INSTALL_INIT_SYSV
 		$(TARGET_DIR)/etc/init.d/S50olsr
 endef
 
+define OLSR_INSTALL_INIT_SYSTEMD
+	$(INSTALL) -D -m 644 package/olsr/olsr.service \
+		$(TARGET_DIR)/usr/lib/systemd/system/olsr.service
+	mkdir -p $(TARGET_DIR)/etc/systemd/system/multi-user.target.wants
+	ln -sf ../../../../usr/lib/systemd/system/olsr.service \
+		$(TARGET_DIR)/etc/systemd/system/multi-user.target.wants/olsr.service
+endef
+
 $(eval $(generic-package))

package/olsr/olsr.service

@@ -0,0 +1,10 @@
+[Unit]
+Description=Ad-hoc wireless mesh routing daemon
+After=network.target
+
+[Service]
+ExecStart=/usr/sbin/olsrd -nofork
+Restart=always
+
+[Install]
+WantedBy=multi-user.target