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#!/bin/sh

# container-tools - Manage systemd-nspawn containers
# Copyright (C) 2014-2016 Daniel Baumann <daniel.baumann@open-infrastructure.net>
#
# 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 <http://www.gnu.org/licenses/>.

set -e

COMMAND="$(basename ${0})"

CONFIG="/etc/container-tools/config"
MACHINES="/var/lib/machines"

Parameters ()
{
	LONG_OPTIONS="all,format:,host:,other,started,stopped,"
	OPTIONS="a,f:,h:,o,s,t,"

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

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

	eval set -- "${PARAMETERS}"

	while true
	do
		case "${1}" in
			-a|--all)
				LIST="${LIST} all"
				shift 1
				;;

			-f|--format)
				FORMAT="${2}"
				shift 2
				;;

			-h|--host)
				HOST="${2}"
				shift 2
				;;

			-o|--other)
				LIST="${LIST} other"
				shift 1
				;;

			-s|--started)
				LIST="${LIST} started"
				shift 1
				;;

			-t|--stopped)
				LIST="${LIST} stopped"
				shift 1
				;;

			--)
				shift 1
				break
				;;

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

Usage ()
{
	echo "Usage: container ${COMMAND} -a|--all --format FORMAT -s|--started -t|--stopped" >&2
	exit 1
}

Parameters "${@}"

LIST="${LIST:-started stopped}"
FORMAT="${FORMAT:-full}"
HOST="${HOST:-$(hostname -f)}"

# Run
case "${FORMAT}" in
	full)
		RED="$(tput setaf 1)$(tput bold)"
		GREEN="$(tput setaf 2)$(tput bold)"
		YELLOW="$(tput setaf 3)$(tput bold)"
		BLUE="$(tput setaf 4)$(tput bold)"
		WHITE="$(tput setaf 7)$(tput bold)"
		NORMAL="$(tput sgr0)"

cat << EOF
${WHITE} ${NORMAL} Container                                      IPv4 Address(es)
--------------------------------------------------------------------------------
EOF

		;;

	short)
		;;
esac

Show ()
{
	case "${FORMAT}" in
		short)
			printf "${CONTAINER}\n"
			;;

		full)
			FIRST_LINE="true"
	#		for i in $(ip a | grep '^[0-9]*:' | awk -F: '{ print $2 }'); do echo $(ip addr show $i | awk '/ inet / { print $2 }'); done

			for ADDRESS in ${ADDRESSES}
			do
				case "${FIRST_LINE}" in
					true)
						FIRST_LINE="false"
						printf "%-80s %-29s\n" "${STATUS} ${BLUE}${CONTAINER}${NORMAL}" "${YELLOW}${ADDRESS}${NORMAL}"
						;;

					*)
						printf "%-80s %-29s\n" "" "${ADDRESS}"
						;;
				esac
			done
			;;
	esac
}

CONTAINERS="$(cd "${MACHINES}" 2>/dev/null && find -maxdepth 1 -type d -and -not -name '.container-tools' -and -not -name 'container-tools' -and -not -name 'lost+found' -and -not -name '.snap' -and -not -name '.snapshot' -printf '%P\n' | sort)"

for CONTAINER in ${CONTAINERS}
do
	STATE="$(machinectl show ${CONTAINER} 2>&1 | awk -F= '/^State=/ { print $2 }')"

	if [ -e "${CONFIG}/${CONTAINER}.conf" ]
	then
		AUTO="$(awk -F= '/^cnt.auto=/ { print $2 }' ${CONFIG}/${CONTAINER}.conf)"
		AUTO="${AUTO:-false}"

		case "${AUTO}" in
			${HOST}|true)
				;;

			*)
				STATE="other"
				;;
		esac
	else
		STATE="other"
	fi

	case "${STATE}" in
		running)
			STATE="started"
			STATUS="${GREEN}${NORMAL}"
			;;

		other)
			STATUS="${WHITE}${NORMAL}"
			;;

		*)
			STATE="stopped"
			STATUS="${RED}${NORMAL}"
			;;
	esac

	if [ -e "${MACHINES}/${CONTAINER}/etc/network/interfaces" ]
	then
		ADDRESSES="$(awk '/address/ { print $2 }' ${MACHINES}/${CONTAINER}/etc/network/interfaces)"
	fi

	ADDRESSES="${ADDRESSES:-n/a}"

	if echo ${LIST} | grep -qs all
	then
		Show
	fi

	for ITEM in other started stopped
	do
		if echo ${LIST} | grep -qs ${ITEM}
		then
			case "${STATE}" in
				${ITEM})
					Show
					;;
			esac
		fi
	done
done