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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:]))
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