#!/bin/sh

usage()
{
    echo "Usage: ${0##*/} <ro-dir>" >&2
    exit 1
}

rodir="$1";shift
rwdir="/tmp/unionfs/$rodir"

[ -d "$rodir" ] || usage

mkdir -p -- "$rwdir"
mount -n -tunionfs -o dirs="$rwdir=rw:$rodir=ro" "$rwdir" "$rodir"
