Using a docker image to run `pdal translate` without having to specify volume paths

pdal-translate.sh

#!/usr/bin/env sh

set -e

docker_image=gadomski/magic-bucket

realpath() {
    [[ $1 = /* ]] && echo "$1" || echo "$PWD/${1#./}"
}

if [[ ! -e $1 ]]; then
    echo "ERROR: infile $1 does not exist"
    exit 1
fi

infile=`realpath "$1"`
volume1=`dirname "$infile"`
infilename="${infile##*/}"
shift

if [[ -z $1 ]]; then
    echo "ERROR: outfile $1 is empty"
    exit 1
fi

outfile=`realpath "$1"`
volume2=`dirname "$outfile"`
outfilename="${outfile##*/}"
shift

docker run --rm -v $volume1:/volume1 -v $volume2:/volume2 $docker_image pdal translate /volume1/$infilename /volume2/$outfilename $@