Script bkp.sh

#!/bin/sh
#
# NAME      bkp.sh
# VERSION   2.8.1
# REQUIRED  sh, awk, du, cut, lscpu, tar, gzip, bzip2, zip, xz, 7z
#

set -o errexit -o nounset

fn_show_usage()
{
    echo "Create a backup using tar"
    echo "Usage: "`basename $0`" [OPTION]... <object_to_backup> [destination_path]"
}

fn_show_help()
{
    fn_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
####

POST_COMMAND="gzip"
EXT=".tar.gz"
STDOUT="true"
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 "$1" in
        -h | -\? | --help )
            fn_show_help
            exit 0
            ;;
        -t | --tar )
            POST_COMMAND="cat"
            EXT=".tar"
            shift
            ;;
        -g | --gzip )   # default
            shift
            ;;
        --gzipFast )
            POST_COMMAND="gzip --fast"
            EXT=".tar.gz"
            shift
            ;;
        -j | --bzip2 )
            POST_COMMAND="bzip2"
            EXT=".tar.bz2"
            shift
            ;;
        -z | --zip )
            POST_COMMAND="zip - -r -q -"
            EXT=".zip"
            shift
            ;;
        -x | --xz )
            POST_COMMAND="xz -z"
            EXT=".tar.xz"
            shift
            ;;
        -7 | --7zip )
            POST_COMMAND="7z a -bso0 -bsp0 -si -t7z"
            EXT=".tar.7z"
            STDOUT="false"
            shift
            ;;
        --7lim )
            POST_COMMAND="7z a -bso0 -bsp0 -si -t7z -v1g -m0=LZMA2 -mmt=${CORES}"
            EXT=".tar.7z"
            STDOUT="false"
            shift
            ;;
        --7limFast )
            POST_COMMAND="7z a -bso0 -bsp0 -si -t7z -v1g -m0=LZMA2:d64k:fb32 -ms=8m -mmt=${CORES} -mx=3"
            EXT=".tar.7z"
            STDOUT="false"
            shift
            ;;
        *)
            if test -z "${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
    fn_show_usage >&2
    exit 1
fi

if test ! -e "${TARGET_PATH-}"
then
    echo "Error: <object_to_backup> must be specified and must exists." >&2
    fn_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
    fn_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 "Estimated: [==================================================]"
echo -n "Progess:   [ "
if test "${STDOUT}" = "true"
then
    tar -c --record-size=10240 --checkpoint="${CHECKPOINT}" --checkpoint-action="${CHECKPOINTACTION}" "${TARGET_PATH}" -f - | ${POST_COMMAND} > "${DEST_FILE}"
else
    tar -c --record-size=10240 --checkpoint="${CHECKPOINT}" --checkpoint-action="${CHECKPOINTACTION}" "${TARGET_PATH}" -f - | ${POST_COMMAND} "${DEST_FILE}"
fi

test "$?" -ne 0 && { echo -e "\nError, exit." >&2 ; exit 4; }
printf "\b]\n"

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



# End