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

repo_root="$(git rev-parse --show-toplevel)"
flake_ref="path:${repo_root}"

# Use a path flake ref so ignored files, especially the local flake.lock, are
# visible to Nix even though the repository itself is a Git worktree.
targets_text="$(
  nix eval \
    --raw \
    --no-write-lock-file \
    "${flake_ref}#nixosConfigurations" \
    --apply 'configs: builtins.concatStringsSep "\n" (builtins.attrNames configs)'
)"

targets=()
while IFS= read -r target; do
  if [ -n "${target}" ]; then
    targets+=("${target}")
  fi
done <<< "${targets_text}"

if [ "${#targets[@]}" -eq 0 ]; then
  echo "No nixosConfigurations found to evaluate." >&2
  exit 1
fi

for target in "${targets[@]}"; do
  echo "Evaluating nixosConfigurations.${target}.config.system.build.toplevel"
  nix eval \
    --raw \
    --no-write-lock-file \
    "${flake_ref}#nixosConfigurations.${target}.config.system.build.toplevel.drvPath" \
    >/dev/null
done