usage() {
cat <<EOF
Usage: ${0##*/} [OPTIONS] [HOST TYPE]
-One line description
+Configure dnsmasq pxe server options and fai-chboot if appropriate.
+
Without HOST TYPE, disable pxe server and fai server.
TYPE is one of arch, plain, fai.
HOST is a hostname known to the dhcp server, or default for all
+Note, when switching between plain and arch, you will need to
+do something like:
+ssh wrt
+cd /mnt/usb
+rm tftpboot
+ln -s <arch/debian iso dir> tftpboot
+
-r Don't redeploy fai config. For example, if there is a different host
that is mid-install.