Hacky bootstrap test script

do-bootstrap-test.sh

#!/usr/bin/env bash

set -euo pipefail
set -x

target="pkgs/stdenv/linux/bootstrap-files/armv7l.nix"

bootstrapToolsDist=$(
  nix-build pkgs/top-level/release-cross.nix -A bootstrapTools.armv7l.dist
)

fetchOutput() {
  local wanted="$1"

  while read -r type name path; do
    if [ "$name" == "$wanted" ]; then
      echo "$path"
      return 0
    fi
  done < "$bootstrapToolsDist/nix-support/hydra-build-products"

  return 1
}

busybox=$(fetchOutput "busybox")
bootstrapTools=$(fetchOutput "tarball")

echo "{
  bootstrapTools = $bootstrapTools;
  busybox = $busybox;
}" > $target

nix-build --argstr system armv7l-linux -A hello