#!/usr/bin/env sh

# return a non-colliding temporary dir name
while :; do
	prefix="${XDG_RUNTIME_DIR:-/tmp}"
	key=$(tr -cd 'a-z0-9' < /dev/urandom | dd bs=7 count=1) 2> /dev/null
	dir="$prefix/$key"
	[ ! -d "$dir" ] || continue

	echo "$dir" && exit 0
done