Avoid killing nbd-daemon on shutdown

Signed-off-by: Gerardo Exequiel Pozzi <vmlinuz386@yahoo.com.ar>

archiso/hooks/archiso_pxe_nbd

@@ -86,5 +86,7 @@ archiso_pxe_nbd_mount_handler () {
     if [ "${copytoram}" = "y" ]; then
         msg "::: Disconnect NBD from ${nbdserver} at /dev/nbd0"
         nbd-client -d /dev/nbd0
+    else
+        pidof nbd-client > /run/nbd_client.pid
     fi
 }

configs/releng/root-image/etc/rc.d/functions.d/omit_kill_nbd_client

@@ -0,0 +1,8 @@
+if [[ -f /run/nbd_client.pid ]]; then
+    omit_kill_nbd_client() {
+        add_omit_pids $(< /run/nbd_client.pid)
+    }
+
+    add_hook shutdown_prekillall omit_kill_nbd_client
+    add_hook single_prekillall omit_kill_nbd_client
+fi