post_install() {
	post_upgrade
}

post_upgrade() {
	# Set NTP servers
	local ntp_servers=(
		ptbtime1.ptb.de
		ptbtime2.ptb.de
		ptbtime3.ptb.de
		ntp1.lrz.de
		ntp3.lrz.de
		ntps1-0.cs.tu-berlin.de
		ntps1-1.cs.tu-berlin.de
	)
	sed -i -E "s/^#?NTP=.*$/NTP=$(echo ${ntp_servers[@]})/" /etc/systemd/timesyncd.conf

	# Enable timesync
	systemctl enable --now systemd-timesyncd

	# Set local time
	ln -sf /usr/share/zoneinfo/Europe/Berlin "/etc/localtime"

	# Enable en_US locale
	echo "LANG=en_US.UTF-8" >/etc/locale.conf
	sed 's/#en_US/en_US/' -i /etc/locale.gen
	locale-gen
}