#!/usr/bin/env bash set -xe INFILE="${1:?Please set arg1 to INFILE}" OUTFILE="${2:?Please set arg2 to OUTFILE}" hash=$(nix-build ${INFILE} --arg pkgs 'import {}' --arg config 'null' 2>&1 | rg -o 'got.*sha256:([0-9a-z]{52})' -r '$1') sed -E "s/0{52}/${hash}/" ${INFILE} > ${OUTFILE}