#!/usr/bin/env nix-shell
#!nix-shell -i bash -p bash

set -e

lnfrom="$1"
lnto="$2"

# ln is clever when there's something else at the place we want to create the link
# only create the link if nothing's there or what is there is another link,
# otherwise you'll get links at unexpected fs locations
! test -e "$lnfrom" || test -L "$lnfrom"  && ln -sf --no-dereference "$lnto" "$lnfrom"