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#!/bin/sh

# Copyright (C) 2014-2022 Daniel Baumann <daniel.baumann@open-infrastructure.net>
#
# SPDX-License-Identifier: GPL-3.0+
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <https://www.gnu.org/licenses/>.

set -e

PROJECT="open-infrastructure"
SOFTWARE="compute-tools"
PROGRAM="container"
COMMAND="$(basename ${0})"

HOOKS="/etc/${SOFTWARE}/hooks"

Parameters ()
{
	GETOPT_LONGOPTIONS="name:,full-upgrade,interactive,autoremove,purge,yes,"
	GETOPT_OPTIONS="n:,f,i,r,p,y,"

	PARAMETERS="$(getopt --longoptions ${GETOPT_LONGOPTIONS} --name=${COMMAND} --options ${GETOPT_OPTIONS} --shell sh -- ${@})"

	if [ "${?}" != "0" ]
	then
		echo "'${COMMAND}': getopt exit" >&2
		exit 1
	fi

	eval set -- "${PARAMETERS}"

	while true
	do
		case "${1}" in
			-n|--name)
				NAME="${2}"
				shift 2
				;;

			-f|--full-upgrade)
				FULL_UPGRADE="true"
				shift 1
				;;

			-i|--interactive)
				INTERACTIVE="true"
				shift 1
				;;

			-r|--autoremove)
				AUTOREMOVE="true"
				shift 1
				;;

			-p|--purge)
				PURGE="--purge"
				shift 1
				;;

			-y|--yes)
				YES="-y"
				shift 1
				;;

			--)
				shift 1
				break
				;;

			*)
				echo "'${COMMAND}': getopt error" >&2
				exit 1
				;;
		esac
	done
}

Usage ()
{
	echo "Usage: ${PROGRAM} ${COMMAND} -n|--name NAME [-f|--full-upgrade] [-i|--interactive] [-r|--autoremove] [-p|--purge] [-y|--yes]" >&2
	echo
	echo "See ${COMMAND}(1), ${PROGRAM}(1) and ${PROJECT}(7) for more information."

	exit 1
}

Parameters "${@}"

if [ -z "${NAME}" ]
then
	Usage
fi

Notification ()
{
	TYPE="${1}"
	NUMBER="${2}"
	PACKAGES="${3}"

	if [ -z "${PACKAGES}" ]
	then
		return
	fi

	CONTAINER_USER="${SUDO_USER:-${USER}}"

	DATE="$(date +%Y-%m-%d\ %H:%M:%S)"
	HOST="$(hostname -f 2> /dev/null || hostname)"

	# logfile
	echo "${DATE} ${HOST} ${CONTAINER_USER} ${NAME} ${NUMBER} ${TYPE}: ${PACKAGES}" >> "/var/log/${SOFTWARE}/${PROGRAM}.log"

	# irc
	if  [ -e /usr/bin/irk ]
	then
		for FILE in "/etc/${SOFTWARE}/${PROGRAM}.conf" "/etc/${SOFTWARE}/${PROGRAM}.conf.d"/*.conf
		do
			if [ -e "${FILE}" ]
			then
				. "${FILE}"
			fi
		done

		if [ -n "${IRK_TARGETS}" ]
		then
			for TARGET in ${IRK_TARGETS}
			do
				irk "${TARGET}" "\x0300${CONTAINER_USER}\x03@\x0312${HOST}:\x03 \x0303${NAME}\x03 \x0307${NUMBER} ${TYPE}\x03: ${PACKAGES}"
			done
		fi
	fi
}

case "${NAME}" in
	ALL)
		NAMES="$(container list --started --format shell)"
		;;

	*)
		NAMES="${NAME}"
		;;
esac

# Pre hooks
for FILE in "${HOOKS}/pre-${COMMAND}".* "${HOOKS}/${NAME}.pre-${COMMAND}"
do
	if [ -x "${FILE}" ]
	then
		"${FILE}"
	fi
done

if [ $(echo ${NAMES} | wc -w) -gt 1 ]
then
	NAME_LOOP="true"
else
	NAME_LOOP="false"
fi

# Run
for NAME in ${NAMES}
do
	case "${INTERACTIVE}" in
		true)
			case "${NAME_LOOP}" in
				true)
					echo
					;;
			esac

			echo -n "'${NAME}': update container '${NAME}' [y|N|a]? "
			read UPDATE

			UPDATE="$(echo ${UPDATE} | tr '[A-Z]' '[a-z]')"

			case "${UPDATE}" in
				a|all)
					INTERACTIVE="false"
					;;

				y|yes)
					;;

				*)
					case "${NAME_LOOP}" in
						true)
							continue
							;;

						*)
							exit 1
							;;
					esac
					;;
			esac
			;;
	esac

	echo "################################################################################"
	echo "Updating ${NAME}"
	echo "################################################################################"

	container run -n ${NAME} -- "apt update"

	UPDATE_NUMBER="$(container run -n ${NAME} -- "apt \-\-simulate full-upgrade" | awk '/^[0-9]* upgraded, / { print $1 }')"

	case "${UPDATE_NUMBER}" in
		0)
			;;

		*)
			# usefull use of grep to de-colorize apt output
			UPDATE_PACKAGES="$(for PACKAGE in $(container run -n ${NAME} -- "apt list \-\-upgradable 2>/dev/null | grep '\/'" | awk -F/ '{ print $1 }'); do echo -n "${PACKAGE} "; done | sed -e 's| $||'; echo)"

			case "${FULL_UPGRADE}" in
				true)
					container run -n ${NAME} -- "DEBCONF_FRONTEND='noninteractive' DEBCONF_PRIORITY='critical' DEBCONF_NONINTERACTIVE_SEEN='true' DEBCONF_NOWARNINGS='true' apt \-o Dpkg::Options::=\-\-force-confold -f ${YES} full-upgrade"
					;;

				*)
					container run -n ${NAME} -- "DEBCONF_FRONTEND='noninteractive' DEBCONF_PRIORITY='critical' DEBCONF_NONINTERACTIVE_SEEN='true' DEBCONF_NOWARNINGS='true' apt \-o Dpkg::Options::=\-\-force-confold -f ${YES} upgrade"
					;;
			esac

			Notification "update(s)" "${UPDATE_NUMBER}" "${UPDATE_PACKAGES}"
			;;
	esac

	case "${AUTOREMOVE}" in
		true)
			REMOVE_NUMBER="$(container run -n ${NAME} -- "apt \-\-simulate autoremove" | awk '/^[0-9]* upgraded, / { print $6 }')"

			case "${REMOVE_NUMBER}" in
				0)
					;;

				*)
					REMOVE_PACKAGES="$(for LINE in $(container run -n ${NAME} -- "apt \-\-simulate autoremove" | grep '^  '); do echo ${LINE}; done | sed -e 's|^ ||' -e 's|
$||'; echo)"

					container run -n ${NAME} -- "apt ${YES} autoremove ${PURGE}"

					Notification "removal(s)" "${REMOVE_NUMBER}" "$(echo ${REMOVE_PACKAGES})"
					;;
			esac
			;;
	esac

	echo "'${NAME}': container updated."
done

# Post hooks
for FILE in "${HOOKS}/post-${COMMAND}".* "${HOOKS}/${NAME}.post-${COMMAND}"
do
	if [ -x "${FILE}" ]
	then
		"${FILE}"
	fi
done