#!/usr/bin/env bash

[ -z "${WORK_PATH}" -o ! -d "${WORK_PATH}/include" ] && WORK_PATH="$(cd "$(dirname "${BASH_SOURCE[0]}")" >/dev/null 2>&1 && pwd)"

. ${WORK_PATH}/include/functions.sh

set -o pipefail # Get exit code from process piped

# Sanity check
if [ ! -f "${ORI_ZIMAGE_FILE}" ]; then
  echo "ERROR: ${ORI_ZIMAGE_FILE} not found!" >"${LOG_FILE}"
  exit 1
fi

echo -n "Patching zImage"

rm -f "${MOD_ZIMAGE_FILE}"

KERNEL="$(readConfigKey "kernel" "${USER_CONFIG_FILE}")"
if [ "${KERNEL}" = "custom" ]; then
  echo -n "."
  MODEL="$(readConfigKey "model" "${USER_CONFIG_FILE}")"
  PRODUCTVER="$(readConfigKey "productver" "${USER_CONFIG_FILE}")"
  PLATFORM="$(readModelKey "${MODEL}" "platform")"
  KVER="$(readModelKey "${MODEL}" "productvers.[${PRODUCTVER}].kver")"
  KPRE="$(readModelKey "${MODEL}" "productvers.[${PRODUCTVER}].kpre")"
  # Extract bzImage
  gzip -dc "${CKS_PATH}/bzImage-${PLATFORM}-$([ -n "${KPRE}" ] && echo "${KPRE}-")${KVER}.gz" >"${MOD_ZIMAGE_FILE}"
else
  echo -n "."
  # Extract vmlinux
  ${WORK_PATH}/bzImage-to-vmlinux.sh "${ORI_ZIMAGE_FILE}" "${TMP_PATH}/vmlinux" >"${LOG_FILE}" 2>&1 || exit 1
  echo -n "."
  # Patch boot params and ramdisk check
  ${WORK_PATH}/kpatch "${TMP_PATH}/vmlinux" "${TMP_PATH}/vmlinux-mod" >"${LOG_FILE}" 2>&1 || exit 1
  echo -n "."
  # rebuild zImage
  ${WORK_PATH}/vmlinux-to-bzImage.sh "${TMP_PATH}/vmlinux-mod" "${MOD_ZIMAGE_FILE}" >"${LOG_FILE}" 2>&1 || exit 1
fi

sync

echo -n "."
# Update HASH of new DSM zImage
HASH="$(sha256sum ${ORI_ZIMAGE_FILE} | awk '{print $1}')"
writeConfigKey "zimage-hash" "${HASH}" "${USER_CONFIG_FILE}"

echo