extend_fvm.py - mozsearch

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# Copyright 2018 The Chromium Authors. All rights reserved.

# Use of this source code is governed by a BSD-style license that can be

# found in the LICENSE file.

"""Copies a FVM file and extends it by a specified amount.

Arg #1: path to 'fvm'.

    #2: the path to the source fvm.blk.

    #3: the path that the extended FVM file will be written to.

    #4: the additional number of bytes to grow fvm.blk by."""

import os

import shutil

import subprocess

import sys

def ExtendFVM(fvm_tool_path, src_path, dest_path, delta):

  old_size = os.path.getsize(src_path)

  new_size = old_size + int(delta)

  shutil.copyfile(src_path, dest_path)

  subprocess.check_call([fvm_tool_path, dest_path, 'extend', '--length',

                         str(new_size)])

  return 0

if __name__ == '__main__':

  sys.exit(ExtendFVM(*sys.argv[1:]))