add a systemd unit file

This restores the configuration when started and clears it when shut down.

Signed-off-by: Christoph Hellwig <hch@lst.de>

debian/control

@@ -2,7 +2,7 @@ Source: nvmetcli
 Section: python
 Priority: optional
 Maintainer: Christoph Hellwig <hch@lst.de>
-Build-Depends: debhelper(>= 8), python, python-setuptools, dh-python
+Build-Depends: debhelper(>= 8), python, python-setuptools, dh-python, dh-systemd  (>= 1.5)
 Standards-Version: 3.9.4
 
 Package: nvmetcli

debian/install

 nvmetcli		/usr/sbin
+nvmet.service		/lib/systemd/system

debian/rules

@@ -8,7 +8,7 @@ export http_proxy = http://127.0.0.1:9
 
 
 %:
-	dh $@ --with python2
+	dh $@ --with python2 --with systemd
 
 override_dh_auto_build:
 	python setup.py build

nvmet.service

+[Unit]
+Description=Restore NVMe kernel target configuration
+Requires=sys-kernel-config.mount
+After=sys-kernel-config.mount network.target local-fs.target
+
+[Service]
+Type=oneshot
+RemainAfterExit=yes
+ExecStart=/usr/sbin/nvmetcli restore
+ExecStop=/usr/sbin/nvmetcli clear
+SyslogIdentifier=nvmetcli
+
+[Install]
+WantedBy=multi-user.target
+