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

script_dir="$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" && pwd)"
output="${1:-${script_dir}/seed.iso}"
files=(user-data meta-data)

mkdir -p "$(dirname -- "$output")"

if [[ -f "${script_dir}/network-config" ]]; then
  files+=(network-config)
fi

if command -v cloud-localds >/dev/null 2>&1; then
  args=()
  if [[ -f "${script_dir}/network-config" ]]; then
    args+=(--network-config="${script_dir}/network-config")
  fi
  cloud-localds "${args[@]}" "${output}" \
    "${script_dir}/user-data" "${script_dir}/meta-data"
elif command -v xorriso >/dev/null 2>&1; then
  xorriso -as mkisofs -quiet -volid cidata -joliet -rock \
    -output "${output}" "${files[@]/#/${script_dir}/}"
elif command -v genisoimage >/dev/null 2>&1; then
  genisoimage -quiet -output "${output}" -volid cidata -joliet -rock \
    "${files[@]/#/${script_dir}/}"
elif command -v mkisofs >/dev/null 2>&1; then
  mkisofs -quiet -output "${output}" -volid cidata -joliet -rock \
    "${files[@]/#/${script_dir}/}"
else
  printf 'Error: install cloud-image-utils, xorriso, genisoimage, or mkisofs.\n' >&2
  exit 1
fi

printf 'Created %s\n' "${output}"