Script bkp.sh

# !/bin/sh
#
# NAME      bkp.sh
# VERSION   2.8.0
# REQUIRED  sh, awk, du, cut, lscpu, tar, gzip, bzip2, zip, xz, 7z
#

set -o errexit -o nounset

fn_abort()
{
    ERRCODE=$?
    echo >&2 "Error $ERRCODE executing $BASH_COMMAND on line ${BASH_LINENO[0]}"
    exit $ERRCODE
}

trap fn_abort EXIT



echo "Create a backup using tar"



show_usage()
{
    echo "Usage: "`basename $0`" [OPTION]... <object_to_backup> [destination_path]"
}

show_help()
{
    show_usage
    echo
    echo "  -h              Show this help"
    echo "  -t, --tar       Uses tar without compression"
    echo "  -g, --gzip      Uses tar with gzip compression (default)"
    echo "      --gzipFast  Uses tar with gzip compression"
    echo "                  using fast compression"
    echo "  -j, --bzip2     Uses tar with bzip2 compression"
    echo "  -z, --zip       Uses tar with zip compression"
    echo "  -x, --xz        Uses tar with xz compression"
    echo "  -7, --7zip      Uses tar with 7zip compression"
    echo "      --7lim      Uses tar with 7zip compression"
    echo "                  limit 7zip file size to 1GB"
    echo "      --7limFast  Uses tar with 7zip compression"
    echo "                  limit 7zip file size to 1GB"
    echo "                  using fast compression"
}



####
# Default vars
####

COMMAND="| gzip >"
EXT=".tar.gz"
CORES=$(( $(lscpu | awk '/^Socket/{ print $2 }') * $(lscpu | awk '/^Core/{ print $4 }') ))



####
# Check
####

# from http://mywiki.wooledge.org/BashFAQ/035

while test $# -gt 0
do
    case "$1" in
        -h | -\? | --help )
            show_help
            exit 0
            ;;
        -t | --tar )
            COMMAND=">"
            EXT=".tar"
            shift
            ;;
        -g | --gzip )   # default
            shift
            ;;
        --gzipFast )
            COMMAND="| gzip --fast >"
            EXT=".tar.gz"
            shift
            ;;
        -j | --bzip2 )
            COMMAND="| bzip2 >"
            EXT=".tar.bz2"
            shift
            ;;
        -z | --zip )
            COMMAND="| zip - -r -q - >"
            EXT=".zip"
            shift
            ;;
        -x | --xz )
            COMMAND="| xz -z >"
            EXT=".tar.xz"
            shift
            ;;
        -7 | --7zip )
            COMMAND="| 7z a -bso0 -bsp0 -si -t7z"
            EXT=".tar.7z"
            shift
            ;;
        --7lim )
            COMMAND="| 7z a -bso0 -bsp0 -si -t7z -v1g -m0=LZMA2 -mmt=${CORES}"
            EXT=".tar.7z"
            shift
            ;;
        --7limFast )
            COMMAND="| 7z a -bso0 -bsp0 -si -t7z -v1g -m0=LZMA2:d64k:fb32 -ms=8m -mmt=${CORES} -mx=3"
            EXT=".tar.7z"
            shift
            ;;
        *)
            if test -z "${TARGET_PATH-}"
            then
                TARGET_PATH="$1"
            elif test -z "${DEST_PATH-}"
            then
                DEST_PATH="$1"
            else
                TOO_MUCH_ARGUMENTS="true"
            fi
            shift
            ;;
    esac
done

if test ! -z "${TOO_MUCH_ARGUMENTS-}"
then
    echo "Error: too much arguments." >&2
    show_usage >&2
    exit 1
fi

if test ! -e "${TARGET_PATH-}"
then
    echo "Error: <object_to_backup> must be specified and must exists." >&2
    show_usage >&2
    exit 2
fi

if test -z "${DEST_PATH-}"
then
    DEST_PATH="."
elif test ! -d "${DEST_PATH}"
then
    echo "Error: <destination_path> must exists." >&2
    show_usage >&2
    exit 3
fi



####
# Execute
####

# define a name
TARGET_FILE=`echo ${TARGET_PATH} | awk 'BEGIN {FS="/"} {print $(NF)}'`

if test "${TARGET_FILE}" = ""
then                    # if $? is empty then "$1" end with /, so
    TARGET_FILE=`echo ${TARGET_PATH} | awk 'BEGIN {FS="/"} {print $(NF-1)}'`
fi

DEST_FILE="${DEST_PATH}/bkp_${TARGET_FILE}_"`date +%Y-%m-%d`"${EXT}"

# add a timestamp if file alredy exist
if test -f "${DEST_FILE}"
then
    DEST_FILE="${DEST_PATH}/bkp_${TARGET_FILE}_"`date +%Y-%m-%d_%H-%M-%S`"${EXT}"
fi

# compress
FROMSIZE=`du --block-size=1 --apparent-size --summarize "${TARGET_PATH}" | cut -f 1`
CHECKPOINT=$((FROMSIZE / 10240 / 50))
CHECKPOINTACTION=`printf 'ttyout=\b-\>'`
echo "Command:   tar -c -f -" \"${TARGET_PATH}\" ${COMMAND} \"${DEST_FILE}\"
echo "Estimated: [==================================================]"
echo -n "Progess:   [ "
eval tar -c --record-size=10240 --checkpoint="${CHECKPOINT}" --checkpoint-action="${CHECKPOINTACTION}" -f - \"${TARGET_PATH}\" ${COMMAND} \"${DEST_FILE}\"
test "$?" -ne 0 && { echo -e "\nError, exit." >&2 ; exit 4; }
printf "\b]\n"

# see the result
ls --color -hl "${DEST_FILE}"*



# End