+[[ $EUID == 0 ]] || exec sudo -E "${BASH_SOURCE[0]}" "$@"
+
+readonly this_file="$(readlink -f -- "${BASH_SOURCE[0]}")"
+script_dir="${this_file%/*}"
+# shellcheck source=./bash-trace
+source "${script_dir}/bash-trace"
+cd $script_dir
+PATH="$PATH:$PWD"
+
+
+usage() {
+ cat <<EOF
+Usage: ${0##*/} [OPTIONS] [HOST] [TYPE]
+Configure dnsmasq boot options and fai-chboot if appropriate. This is
+not general purpose, it has code specific to dhcp servers I run.
+
+Without TYPE, disable server and fai server. In that case, HOST is only
+needed for fsf office network.
+
+HOST Only do dhcp pxe for HOST. The hostname must be known to the dhcp
+ server to target its mac. Use "default" for all hosts.
+ Required in fsf office environment.
+
+TYPE One of arch, parabola, plain, fai.
+
+-a Don't setup pxe, just Wait for 2 dhcp acks, then disable the pxe
+ server after a delay. First ack is for pxe boot, 2nd ack is
+ for os boot. Sometimes on debian, there is a 3rd one shortly
+ after the 2nd. I can't remember exactly why this caused a
+ problem, but I'm hoping the sleep will take care of it.
+-d Don't alter dhcp config. Only make sense for fai type, and on network
+ other than home or fsf, when using fai-cd, or pxe-kexec.
+-k Pass -k to myfai-chboot.
+--no-r Pass --no-r to myfai-chboot.
+-r Don't redeploy fai config. For example, if there is a different host
+ that is mid-install.
+
+-S sets FAI_ACTION=sysinfo, see myfai-chboot for more info.
+-w Setup pxe, then wait like -a.
+-h|--help Print help and exit
+
+
+Note, when switching between plain and arch or parabola, you will need to
+do something like:
+ssh wrt
+cd /mnt/usb
+rm tftpboot
+ln -s <arch/parabola/debian iso dir> tftpboot
+
+
+Notes on debugging pxe dhcp tftp:
+
+For debugging dhcp, add to /etc/dnsmasq.conf: log-dhcp
+
+Newer openwrt runs dnsmasq with a whitelist of readable files and dirs:
+
+ps ww :
+/sbin/ujail -t 5 -n dnsmasq -u -l -r /bin/ubus -r /etc/TZ -r /etc/dnsmasq.conf -r /etc/ethers -r /etc/group -r /etc/hosts -r /etc/passwd -w /tmp/dhcp.leases -r /tmp/dnsmasq.d -r /tmp/hosts -r /tmp/resolv.conf.d -r /usr/bin/jshn -r /usr/lib/dnsmasq/dhcp-script.sh -r /usr/share/dnsmasq/dhcpbogushostname.conf -r /usr/share/dnsmasq/rfc6761.conf -r /usr/share/dnsmasq/trust-anchors.conf -r /usr/share/libubox/jshn.sh -r /var/etc/dnsmasq.conf.cfg01411c -w /var/run/dnsmasq/ -- /usr/sbin/dnsmasq -C /var/etc/dnsmasq.conf.cfg01411c -k -x /var/run/dnsmasq/dnsmasq.cfg01411c.pid
+
+logging tftp requests:
+/etc/default/tftpd-hpa:
+add -vv:
+TFTP_OPTIONS="--secure -vv"
+jr -u tftpd-hpa -f
+
+Note: Uses GNU getopt options parsing style