#!/bin/sh

# tape-backup
#
# Creates a single archive on tape. After the backup is finished,
# the tape is rewound.

# Read configuration informations
source /etc/backup.conf

# Exclude files list
EXC_LIST="/tmp/exclude-sockets"

print_usage()
{
    echo "$(basename $0) - Backup directories/files, starting at the beginning of the tape."
    echo "              After the backup is finished, the tape is rewound."
    echo "Usage: $(basename $0) [-h] [--label "label"] DIR1 DIR2 ..."
}

if [ ${#} -gt 0 ]; then
    if [ "x${1}" = "x-h" ]; then
	print_usage
	exit 0
    fi
fi

if [ $# = 0 ]; then
    echo "Missing arguments"
    print_usage
    exit 1
fi

if [ "x${1}" = "x--label" ]; then
    if [ $# -lt 2 ]; then
	echo "Missing arguments for --label option"
	print_usage
	exit 1
    fi

    TAPE_LABEL=${2}
    shift
    shift

    if [ $# = 0 ]; then
	echo "No directory to backup specified"
	print_usage
	exit 1
    fi

else
    TAPE_LABEL="CVDS Linux Mail/Web Server Backup (`date '+%Y-%m-%d'`)."
fi

DIRECTORIES=${@}

echo "TAPE_LABEL=$TAPE_LABEL"

if ${MT} status | grep "ONLINE"; then
    # Rewinding the tape
    ${MT} rewind || exit 1

    # Finding sockets
    find ${DIRECTORIES} -type s > ${EXC_LIST} || exit 1

    # Setting compression on
    ${MT} compression 1 || exit 1

    # Archiving
    tar -cf /dev/tape ${DIRECTORIES} --ignore-failed-read --label="${TAPE_LABEL}" \
	--exclude="*.sock" --exclude="*.lock" --exclude-from=${EXC_LIST} \
	--absolute-names --totals || exit 1

    if ! ${MT} status | grep "ONLINE"; then
	echo "***** tape-drive status is not ONLINE"
	exit 1
    fi

    # Rewinding the tape
    ${MT} rewind || exit 1

    # Ejecting tape
    ${MT} offline || exit 1
    
    rm ${EXC_LIST}
else
    echo "***** WARNING TAPE DRIVE IS OFFLINE, NO BACKUPS PERFORMED"
    exit 1
fi

exit $?