Ensure file permissions are writable before attempting to sign.

import os

import shlex

import shutil

import stat

import sys

import uuid

import zipfile

  # AVB-sign the image as needed.

  if OPTIONS.info_dict.get("avb_enable") == "true":

    # Signing requires +w

    os.chmod(img.name, os.stat(img.name).st_mode | stat.S_IWUSR)

    avbtool = OPTIONS.info_dict["avb_avbtool"]

    part_size = OPTIONS.info_dict["dtbo_size"]

    # The AVB hash footer will be replaced if already present.