#!/bin/sh

set -e

CONFFILE="/etc/open-infrastructure/container.conf"

Install ()
{
	DEFAULT="${1}"
	TARGET="${2}"

	mkdir -p "${DEFAULT}"
	mkdir -p "${TARGET}"

	if [ "${TARGET}" != "${DEFAULT}" ]
	then
		if [ -h "${DEFAULT}" ]
		then
			rm -f "${DEFAULT}"
			ln -s "${TARGET}" "${DEFAULT}"
		else
			if [ -e "${DEFAULT}" ] && find "${DEFAULT}" -maxdepth 0 -empty > /dev/null 2>&1
			then
				rmdir "${DEFAULT}"
				ln -s "${TARGET}" "${DEFAULT}"
			fi
		fi
	fi

	if ! dpkg-statoverride --list "${DEFAULT}" > /dev/null 2>&1 &&
	   ! dpkg-statoverride --list "${TARGET}" > /dev/null 2>&1
	then
		chmod 0700 "${TARGET}"
		chown root:root "${TARGET}"

		chmod 0700 "${DEFAULT}"
		chown root:root "${DEFAULT}"
	fi
}

case "${1}" in
	configure)
		update-alternatives --quiet --install /usr/share/open-infrastructure/container/scripts/default container_script /usr/share/open-infrastructure/container/scripts/curl 1000
		update-alternatives --quiet --install /usr/share/open-infrastructure/container/scripts/default container_script /usr/share/open-infrastructure/container/scripts/mmdebstrap 2000
		update-alternatives --quiet --install /usr/share/open-infrastructure/container/scripts/default container_script /usr/share/open-infrastructure/container/scripts/debootstrap 3000
		update-alternatives --quiet --install /usr/share/open-infrastructure/container/scripts/default container_script /usr/share/open-infrastructure/container/scripts/progress-linux 4000
		update-alternatives --quiet --install /usr/share/open-infrastructure/container/scripts/default container_script /usr/share/open-infrastructure/container/scripts/debian 5000

		. /usr/share/debconf/confmodule

		db_get open-infrastructure-container-tools/machines
		MACHINES="${RET:-/var/lib/machines}" # string (w/o empty)

		db_get open-infrastructure-container-tools/config
		CONFIG="${RET:-/etc/container-tools/config}" # string (w/o empty)

		db_get open-infrastructure-container-tools/debconf
		DEBCONF="${RET:-/etc/container-tools/debconf}" # string (w/o empty)

		db_get open-infrastructure-container-tools/hooks
		HOOKS="${RET:-/etc/container-tools/hooks}" # string (w/o empty)

		db_get open-infrastructure-container-tools/keys
		KEYS="${RET:-/etc/container-tools/keys}" # string (w/o empty)

		db_get open-infrastructure-container-tools/cache
		CACHE="${RET:-/var/cache/container-tools}" # string (w/o empty)

		db_get open-infrastructure-container-tools/script
		SCRIPT="${RET:-debian}" # string (w/o empty)

		db_get open-infrastructure-container-tools/irc
		IRK_TARGETS="${RET}" # string (w/ empty)

		db_stop

		Install "/var/lib/machines" "${MACHINES}"
		Install "/etc/open-infrastructure/container/config" "${CONFIG}"
		Install "/etc/open-infrastructure/container/debconf" "${DEBCONF}"
		Install "/etc/open-infrastructure/container/hooks" "${HOOKS}"
		Install "/etc/open-infrastructure/container/keys" "${KEYS}"
		Install "/var/cache/open-infrastructure/container" "${CACHE}"

		update-alternatives --quiet --set container_script "/usr/share/open-infrastructure/container/scripts/${SCRIPT}"

		if [ ! -e "${CONFFILE}" ]
		then

cat > "${CONFFILE}" << EOF
# ${CONFFILE}

IRK_TARGETS="${IRK_TARGETS}"
EOF

		fi

		cp -a -f "${CONFFILE}" "${CONFFILE}.tmp"

		# If the admin deleted or commented some variables but then set
		# them via debconf, (re-)add them to the config file.

		test -z "${IRK_TARGETS}" || \
			grep -Eq '^ *IRK_TARGETS=' "${CONFFILE}" || \
			echo "IRK_TARGETS=" >> "${CONFFILE}"

		sed -e "s|^ *IRK_TARGETS=.*|IRK_TARGETS=\"${IRK_TARGETS}\"|" \
		< "${CONFFILE}" > "${CONFFILE}.tmp"

		mv -f "${CONFFILE}.tmp" "${CONFFILE}"

		if [ -x /sbin/sysctl ]
		then
			sysctl -q -p /etc/sysctl.d/zz-container.conf
		fi
		;;

	abort-upgrade|abort-remove|abort-deconfigure)

		;;

	*)
		echo "postinst called with unknown argument \`${1}'" >&2
		exit 1
		;;
esac

#DEBHELPER#

exit 0