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#!/usr/bin/env bash
# SPDX-FileCopyrightText: 2023 The TVL Authors
#
# SPDX-License-Identifier: MIT
#
# Builds a NixOS system configuration at the given attribute path.
set -ueo pipefail
# Load input variables from Terraform. jq's @sh format takes care of
# escaping.
eval "$(jq -r '@sh "attrpath=\(.attrpath) && entrypoint=\(.entrypoint)"')"
# Evaluate the system derivation.
[[ -z "$entrypoint" ]] && entrypoint=$(git rev-parse --show-toplevel)
# shellcheck disable=SC2154
system_drv=$(nix-instantiate -A "${attrpath}" "${entrypoint}")
# Return system derivation back to Terraform.
jq -n --arg drv "$system_drv" '{"drv":$drv}'
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