dracut/95nbft: Define respawn attempts on a connection failure

In case the `nvme connect-all --nbft` call fails, respawn the service
after 10 seconds and try again. Depends on nvme-cli to return non-zero
status in case of any of the SSNS records that are not marked
as 'unavailable' fails to connect.

The respawn cycle is broken by stopping the unit once rootfs
is mounted and system switches the root.

Signed-off-by: Tomas Bzatek <tbzatek@redhat.com>

Author: tbzatek

nvmf-autoconnect/dracut-95nbft/nbft-boot-connect.service.in

@@ -13,6 +13,11 @@ Before=remote-fs-pre.target
 [Service]
 RestrictAddressFamilies=AF_INET AF_INET6
 Type=oneshot
+# Connection attempt recovery
+Restart=on-failure
+RestartSec=10
+StartLimitIntervalSec=0
+StartLimitBurst=0
 # No 'modprobe@.service' available in the initramfs
 ExecStartPre=-/sbin/modprobe nvme-fabrics
 ExecStart=/usr/sbin/nvme connect-all --nbft