#!/usr/bin/env bash
set -euo pipefail

SCRIPT_DIR=$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)

function top_level_nix_expr() {
  echo "let pkgs = import <nixpkgs> {}; in ["
  find "${SCRIPT_DIR}"/.. -name "shell.nix" -print0 | xargs -0 -n1 -I {} echo "  (pkgs.lib.overrideDerivation (import {}) (old: { nobuildPhase = \"mkdir -p \$out\"; }))"
  echo "]"
}

nix-build -E "$(top_level_nix_expr)" --no-out-link --show-trace