#!/bin/sh
set -e

log_debug() {
	echo "Debug: piuparts exception for package $PIUPARTS_OBJECTS"
}

case ${PIUPARTS_OBJECTS%%=*} in
	apt-listbugs)
		# cleanup from post_install_exceptions
		log_debug
		rm -f /usr/sbin/apt-listbugs
		dpkg-divert --remove --rename /usr/sbin/apt-listbugs
		;;
	file-rc)
		# removal won't work if sysv-rc isn't reinstalled
		case "$PIUPARTS_DISTRIBUTION" in
			lenny)
				log_debug
				echo 'Yes, do as I say!' | apt-get -y --force-yes install sysv-rc
				;;
			squeeze*)
				log_debug
				yes 'Yes, do as I say!' | apt-get -y --force-yes install sysv-rc
				;;
		esac
		;;
	freebsd-buildutils)
		case "$PIUPARTS_DISTRIBUTION" in
			lenny|squeeze)
				# apt considers original-awk as essential
				log_debug
				apt-get -y remove freebsd-buildutils
				echo 'Yes, do as I say!' | apt-get -y --force-yes remove original-awk
		esac
		;;
	original-awk)
		case "$PIUPARTS_DISTRIBUTION" in
			lenny|squeeze)
				# apt considers original-awk as essential
				log_debug
				echo 'Yes, do as I say!' | apt-get -y --force-yes remove original-awk
		esac
		;;
esac

case "$PIUPARTS_DISTRIBUTION" in
	jessie*)
		# prevent failure of 'apt-get --reinstall install systemd-sysv systemd'
		# due to spurious dependency cycle (#237470)
		case ${PIUPARTS_OBJECTS%%=*} in
			file-rc|\
			live-config|\
			live-config-upstart|\
			upstart)
				log_debug
				apt-get -y install systemd-sysv
				;;
		esac
		;;
esac

case "$PIUPARTS_DISTRIBUTION" in
	lenny*|squeeze*|wheezy*|jessie*)
		# --allow-remove-essential was added in apt 1.1 (stretch)
		;;
	*)
		case ${PIUPARTS_OBJECTS%%=*} in
			init|\
			education-thin-client|\
			grub-efi-amd64-signed|\
			grub-efi-ia32-signed|\
			ltsp-client|\
			ltsp-client-core|\
			ltsp-client-core-dbgsym)
				log_debug
				# requires removal of essential packages
				if [ ! -f /etc/apt/apt.conf.d/piuparts-allow-remove-essential ]
				then
					echo "Enabling APT::Get::allow-remove-essential"
					echo 'APT::Get::allow-remove-essential "true";' >> /etc/apt/apt.conf.d/piuparts-allow-remove-essential
				fi
				;;
		esac
		;;
esac

# Allow removal of the kernel running on the host from the chroot.
UNAME_R="$(uname -r)"
echo "linux-image-$UNAME_R linux-image-$UNAME_R/prerm/removing-running-kernel-$UNAME_R boolean false" | debconf-set-selections