#!/bin/bash
this_file="$(realpath -s $0)"
this_dir="$(dirname $this_file)"
this_user=$SUDO_USER

# Ensure running as sudo from home
if [ `id -u` -ne 0 ]; then
	echo Need sudo
	exit 1
fi
cd ~

# Update packages
apt update
apt install -y qemu-guest-agent chrony

# Flush logs
logrotate -f /etc/logrotate.conf
systemctl stop rsyslog

# Cleanup machine ID for regeneration during reboot
cat /etc/machine-id
>/etc/machine-id
test -f /var/lib/dbus/machine-id && {
        rm /var/lib/dbus/machine-id;
        ln -s /etc/machine-id /var/lib/dbus/machine-id;
}

# Cleanup tmp and ssh directories
rm -rf /tmp/*
rm -rf /var/tmp/*
rm -f /etc/ssh/ssh_host_*

# Cleanup apt
apt clean
apt autoremove

# Trim filesystem
fstrim -av

# First boot initialization script,
# assuming 'vm-firstboot.sh' in same directory
test -f /etc/rc.local && cp -a /etc/rc.local /etc/rc.local.bak
cp -a "$this_dir/vm-firstboot.sh" /etc/rc.local
chown root:root /etc/rc.local
chmod +x /etc/rc.local