#!/bin/sh
# 
# Copyright (c) 2018-2020, Christer Edwards <christer.edwards@gmail.com>
# All rights reserved.
# 
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
# 
# * Redistributions of source code must retain the above copyright notice, this
#   list of conditions and the following disclaimer.
# 
# * Redistributions in binary form must reproduce the above copyright notice,
#   this list of conditions and the following disclaimer in the documentation
#   and/or other materials provided with the distribution.
# 
# * Neither the name of the copyright holder nor the names of its
#   contributors may be used to endorse or promote products derived from
#   this software without specific prior written permission.
# 
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

. /usr/local/share/bastille/colors.pre.sh
. /usr/local/etc/bastille/bastille.conf

usage() {
    echo -e "${COLOR_RED}Usage: bastille export TARGET.${COLOR_RESET}"
    exit 1
}

# Handle special-case commands first
case "$1" in
help|-h|--help)
    usage
    ;;
esac

if [ $# -gt 1 ] || [ $# -lt 1 ]; then
    usage
fi

TARGET="${1}"
shift

error_notify()
{
    # Notify message on error and exit
    echo -e "$*" >&2
    exit 1
}

jail_export()
{
    # Attempt to export the container
    DATE=$(date +%F-%H%M%S)
    if [ -d "${bastille_jailsdir}/${TARGET}" ]; then
        if [ "${bastille_zfs_enable}" = "YES" ]; then
            if [ ! -z "${bastille_zfs_zpool}" ]; then
                FILE_EXT="xz"
                echo -e "${COLOR_GREEN}Exporting '${TARGET}' to a compressed .${FILE_EXT} archive.${COLOR_RESET}"
                echo -e "${COLOR_GREEN}Sending zfs data stream...${COLOR_RESET}"
                # Take a recursive temporary snapshot
                SNAP_NAME="bastille_export-${DATE}"
                zfs snapshot -r ${bastille_zfs_zpool}/${bastille_zfs_prefix}/jails/${TARGET}@${SNAP_NAME}

                # Export the container recursively and cleanup temporary snapshots
                zfs send -R ${bastille_zfs_zpool}/${bastille_zfs_prefix}/jails/${TARGET}@${SNAP_NAME} | \
                xz ${bastille_compress_xz_options} > ${bastille_backupsdir}/${TARGET}_${DATE}.${FILE_EXT}
                zfs destroy -r ${bastille_zfs_zpool}/${bastille_zfs_prefix}/jails/${TARGET}@${SNAP_NAME}
            fi
        else
            # Create standard backup archive
            FILE_EXT="txz"
            echo -e "${COLOR_GREEN}Exporting '${TARGET}' to a compressed .${FILE_EXT} archive...${COLOR_RESET}"
            cd ${bastille_jailsdir} && tar -cf - ${TARGET} | xz ${bastille_compress_xz_options} > ${bastille_backupsdir}/${TARGET}_${DATE}.${FILE_EXT}
        fi

        if [ $? -ne 0 ]; then
            error_notify "${COLOR_RED}Failed to export '${TARGET}' container.${COLOR_RESET}"
        else
            # Generate container checksum file
            cd ${bastille_backupsdir}
            sha256 -q ${TARGET}_${DATE}.${FILE_EXT} > ${TARGET}_${DATE}.sha256
            echo -e "${COLOR_GREEN}Exported '${bastille_backupsdir}/${TARGET}_${DATE}.${FILE_EXT}' successfully.${COLOR_RESET}"
            exit 0
        fi
    else
        error_notify "${COLOR_RED}Container '${TARGET}' does not exist.${COLOR_RESET}"
    fi
}

# Check if backups directory/dataset exist
if [ ! -d "${bastille_backupsdir}" ]; then
    error_notify "${COLOR_RED}Backups directory/dataset does not exist, See 'bastille bootstrap'.${COLOR_RESET}"
fi

# Check if is a ZFS system
if [ "${bastille_zfs_enable}" != "YES" ]; then
    # Check if container is running and ask for stop in UFS systems
    if [ -n "$(jls name | awk "/^${TARGET}$/")" ]; then
        error_notify "${COLOR_RED}${TARGET} is running, See 'bastille stop'.${COLOR_RESET}"
    fi
fi

jail_export