#!/bin/bash

# backup
#
# Creates a single compressed archive.

if [ ! -f /etc/backup.conf ]; then
    echo "Error: missing /etc/backup.conf configuration file."
    exit 1
fi

# Read list of backup files/directories
source /etc/backup.conf

# Set default value if not specified
: ${BKP_DEST_DIR:="./"}

# Default value
ARCHIVE_LABEL="backup-data-amd64-`date '+%Y-%m-%d'`"

# Exclude files list
EXC_LIST="/tmp/hv-backup-exclude-list"

print_usage()
{
    echo "$(basename $0) - Backup files/directories."
    echo "Usage: $(basename $0) [-h] [--label "label"]"
}

if [ ${#} -gt 0 ]; then
    if [ "x${1}" = "x-h" ]; then
	print_usage
	exit 0
    fi
    if [ "x${1}" = "x--label" ]; then
        if [ $# -lt 2 ]; then
	    echo "Missing arguments for --label option"
	    print_usage
	    exit 1
        fi

        ARCHIVE_LABEL=${2}
        shift
        shift

        if [ $# = 0 ]; then
	    echo "No directory to backup specified"
	    print_usage
	    exit 1
        fi
    else
	echo "Unknown arguments: ${@}"
	print_usage
	exit 1
    fi
fi

ARCHIVE_NAME=${BKP_DEST_DIR}/${ARCHIVE_LABEL}.tar.bz2

echo "ARCHIVE_LABEL=$ARCHIVE_LABEL"

cat > ${EXC_LIST} << "EOF"
/media/*
/proc/*
/dev/*
/sys/*
/tmp/*
*.sock
*.lock
*/.gvfs*
EOF

# Finding sockets, and listing them in the exclude file.
# Errors and warnings must be discarded because of .gvfs directory for example.
# Even when using -prune option, find exits with a non-zero status when resding
# .gvfs
find ${BKP_FILES_LIST} -type s >> ${EXC_LIST} 2> /dev/null

# Archiving
tar jcf ${ARCHIVE_NAME} ${BKP_FILES_LIST} \
    --label="${ARCHIVE_LABEL}" \
    --ignore-failed-read \
    --exclude-backups \
    --exclude-caches \
    --exclude-from=${EXC_LIST} \
    --absolute-names \
    --totals

rm ${EXC_LIST}

exit $?