#!/bin/sh

# tape-backup-mult
#
# Creates archive at current position of tape, thus enabling creation of
# multiple archives on a single tape. After the backup is finished,
# the tape is NOT 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 current position of the tape."
    echo "                   After the backup is finished, the tape is NOT 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="Backup (`date '+%Y-%m-%d'`)"
fi

DIRECTORIES=${@}

echo "TAPE_LABEL=$TAPE_LABEL"

if ${MT} status | grep "ONLINE"; then

    # We don't rewind the tape, we add a new archive at the current position of the tape.

    # Finding sockets
    # Removed, because the find command returned:  "find: /root/big-file.tar.bz2: Value too large for defined data type"
    # (the file was 6G)
    # find ${DIRECTORIES} -type s > ${EXC_LIST} || exit 1
    echo "" > ${EXC_LIST}

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

    # Archiving
    tar -cf /dev/tape ${DIRECTORIES} --label="${TAPE_LABEL}" --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

    rm ${EXC_LIST}
else
    echo "***** WARNING TAPE DRIVE IS OFFLINE, NO BACKUPS PERFORMED"
    exit 1
fi

exit $?