post_install() {
	if ! getent group dnscrypt &>/dev/null; then
		groupadd -r dnscrypt >/dev/null
	fi
	if ! getent passwd dnscrypt &>/dev/null; then
		useradd -r -g dnscrypt -G adm -d /dev/null -s /bin/nologin dnscrypt >/dev/null
	fi
	if ! groups dnscrypt | grep adm &>/dev/null; then
		gpasswd -a dnscrypt adm >/dev/null
	fi
	dnscrypt_shell=$(getent passwd dnscrypt | cut -d: -f7)
	if [ "$dnscrypt_shell" != '/bin/nologin' ]; then
		chsh -s /bin/nologin dnscrypt &>/dev/null
	fi
	echo '>>> DNSCrypt, add next line inside of /etc/dhcpcd.conf'
	echo '>>> static domain_name_servers=127.0.0.1::1'
}

post_upgrade() {
	post_install
	if (( $(vercmp $2 2.0.0-1) < 0 )); then
		echo '>>> The configuration file(s) and setup of DNSCrypt has changed considerably since version 1.x.'
		echo '>>> Please refer to https://dnscrypt.info/doc for help!'
	fi
}

post_remove() {
	if getent passwd dnscrypt &>/dev/null; then
		userdel dnscrypt >/dev/null
	fi
	if getent group dnscrypt &>/dev/null; then
		groupdel dnscrypt >/dev/null
	fi
}