#! /bin/bash
  #
  # Copyright (C) 2016, Lukasz Majewski <l.majewski@majess.pl>
  #
  # SPDX-License-Identifier:      GPL-2.0+
  #
  
  # This file extracts default envs from built u-boot

  # usage: get_default_envs.sh [build dir] > u-boot-env-default.txt

  set -ue

  : "${OBJCOPY:=${CROSS_COMPILE:-}objcopy}"
  
  ENV_OBJ_FILE="built-in.o"

  ENV_OBJ_FILE_COPY="copy_${ENV_OBJ_FILE}"
  
  echoerr() { echo "$@" 1>&2; }

  if [ "$#" -eq 1 ]; then
      path=${1}
  else
      path=$(readlink -f $0)
      path=${path%/scripts*}
  fi
  
  env_obj_file_path=$(find ${path} -path "*/env/*" -not -path "*/spl/*" \

  			 -name "${ENV_OBJ_FILE}")
  [ -z "${env_obj_file_path}" ] && \
      { echoerr "File '${ENV_OBJ_FILE}' not found!"; exit 1; }
  
  cp ${env_obj_file_path} ${ENV_OBJ_FILE_COPY}
  
  # NOTE: objcopy saves its output to file passed in

  # (copy_${ENV_OBJ_FILE} in this case)
  
  ${OBJCOPY} -O binary -j ".rodata.default_environment" ${ENV_OBJ_FILE_COPY}

  
  # Replace default '\0' with '
  ' and sort entries
  tr '\0' '
  ' < ${ENV_OBJ_FILE_COPY} | sort -u
  
  rm ${ENV_OBJ_FILE_COPY}
  
  exit 0