firstboot

#!/bin/sh

PXESERVER=10.0.0.1

# This script will run the first time the system boots. Even
# though we've told it to run after networking is enabled,
#
# Introducing a brief sleep makes things work right all the
# time. The time for DHCP to catch up.
sleep 60

# install our new sources
cat > /etc/apt/sources.list <<EOF
deb http://$PXESERVER:3142/debian stretch main contrib non-free
deb http://repo.saltstack.com/apt/debian/9/amd64/latest stretch main

EOF

#echo "APT::Get::AllowUnauthenticated yes;" > /etc/apt/apt.conf.d/99auth

# add salt key
wget -O - https://repo.saltstack.com/apt/debian/9/amd64/latest/SALTSTACK-GPG-KEY.pub | apt-key add -


# update apt
/usr/bin/apt-get update

# Install the salt client
apt-get install --yes --no-install-recommends --force-yes salt-minion

sed -i -e "s|#master: salt|master: $PXESERVER|" /etc/salt/minion

# download configuration files
/usr/bin/curl -o /tmp/iplist http://$PXESERVER/iplist

# get ip and detect hostname
_ip=`ip addr list eno1 |grep 'inet ' |cut -d' ' -f6|cut -d/ -f1`
hostname=`grep $_ip /tmp/iplist | awk '{print $1}'`
rm /tmp/iplist

# set hostname
echo $hostname > /etc/hostname
echo $hostname > /etc/salt/minion_id

/etc/init.d/salt-minion restart

# Remove our firstboot service so that it won't run again
rm -f /etc/init.d/firstboot /root/firstboot /lib/systemd/system/firstboot.service

# Reboot into the new kernel
/sbin/reboot