#!/bin/sh

#set -x # print executed commands to shell
set -e # exit if any command reutrns non-zero

if [ "$#" -ne 2 ]; then
    echo
    echo "  Usage: $0 [docker-volume-name] [target-file-name]"
    echo
    echo "     tar docker-volume-name to target-file-name in current directory."
    echo
    exit
fi

docker run --rm -it  -v $1:/IN:ro -v `pwd`:/OUT bash tar -C /IN -czf /OUT/$2 .