Add node autoready oneshot unit

This replicates some of the more important functionality of the defunct
pvc-flush.service unit. On presence of a trigger file (i.e.
/etc/pvc/autoready), it will trigger a "node ready" on boot. It does
nothing on shutdown as this must be handled by other mechanisms, though
a similar autoflush could be added as well.

debian/pvc-daemon-node.install

@@ -3,4 +3,5 @@ node-daemon/pvcnoded.sample.yaml etc/pvc
 node-daemon/pvcnoded usr/share/pvc
 node-daemon/pvcnoded.service lib/systemd/system
 node-daemon/pvc.target lib/systemd/system
+node-daemon/pvcautoready.service lib/systemd/system
 node-daemon/monitoring usr/share/pvc

debian/pvc-daemon-node.postinst

@@ -5,6 +5,7 @@ systemctl daemon-reload
 
 # Enable the service and target
 systemctl enable /lib/systemd/system/pvcnoded.service
+systemctl enable /lib/systemd/system/pvcautoready.service
 systemctl enable /lib/systemd/system/pvc.target
 
 # Inform administrator of the service restart/startup not occurring automatically

node-daemon/pvcautoready.service

@@ -0,0 +1,19 @@
+# Parallel Virtual Cluster autoready oneshot
+
+[Unit]
+Description = Parallel Virtual Cluster autoready oneshot
+After = pvcnoded.service pvcapid.service zookeeper.service libvirtd.service ssh.service ceph.target network-online.target
+Wants = pvcnoded.service pvcapid.service
+PartOf = pvc.target
+ConditionPathExists=/etc/pvc/autoready
+
+[Service]
+Type = oneshot
+RemainAfterExit = false
+WorkingDirectory = /usr/share/pvc
+TimeoutSec = 31min
+ExecStartPre = /bin/sleep 60
+ExecStart = /usr/bin/pvc -c local node ready --wait
+
+[Install]
+WantedBy = pvc.target