#!/bin/sh

create_directories() {
    workdir="$(mktemp -d)"
    mkdir -p "$workdir/source"
    mkdir -p "$workdir/dest"
    mkdir -p "$workdir/restore"

    if [ $# -eq 1 ]; then
        filename_len=$1
    else
        filename_len=255
    fi
    # generate a filename with every possible byte in it to test
    # escaping, the only character not included is `/` since that is
    # illegal for filenames (obviously)
    echo 'Hello World!' > "$workdir/source/$(for i in $(seq 0 $filename_len); do printf '%x' "$i" | xxd -r -p; done | tr -d '/')"
    echo "$workdir"
}

create_docker_volume() {
    volumename="tarback-docker-volume-test-$(shuf -i 1000-9999 -n 1)"
    # use shorter name because alpine runs into a filename length limit
    if [ $# -eq 2 ]; then
        workdir="$1"
        filename="$2"
        docker run --rm -i -v "$volumename:/mnt" alpine tee "/mnt/$filename" < "$workdir/source/$filename" 1>/dev/null
    fi
    echo "$volumename"
}

extract_docker_volume() {
    volumename="$1"
    workdir="$2"
    filename="$3"
    #docker run --rm -v "$volumename:/mnt" alpine find /
    docker run --rm -v "$volumename:/mnt" alpine cat "/mnt/$filename" > "$workdir/restore/$filename"
}