OVMS3-idf/components/app_update/gen_empty_partition.py

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#!/usr/bin/env python
#
# generates an empty binary file
#
# This tool generates an empty binary file of the required size.
#
# Copyright 2018 Espressif Systems (Shanghai) PTE LTD
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http:#www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from __future__ import print_function, division
from __future__ import unicode_literals
import argparse
import os
import re
import struct
import sys
import hashlib
import binascii
__version__ = '1.0'
quiet = False
def status(msg):
""" Print status message to stderr """
if not quiet:
critical(msg)
def critical(msg):
""" Print critical message to stderr """
if not quiet:
sys.stderr.write(msg)
sys.stderr.write('\n')
def generate_blanked_file(size, output_path):
output = b"\xFF" * size
try:
stdout_binary = sys.stdout.buffer # Python 3
except AttributeError:
stdout_binary = sys.stdout
with stdout_binary if output_path == '-' else open(output_path, 'wb') as f:
f.write(output)
def main():
global quiet
parser = argparse.ArgumentParser(description='Generates an empty binary file of the required size.')
parser.add_argument('--quiet', '-q', help="Don't print status messages to stderr", action='store_true')
parser.add_argument('--size', help='Size of generated the file', type=str, required=True)
parser.add_argument('output', help='Path for binary file.', nargs='?', default='-')
args = parser.parse_args()
quiet = args.quiet
size = int(args.size, 0)
if size > 0 :
generate_blanked_file(size, args.output)
return 0
class InputError(RuntimeError):
def __init__(self, e):
super(InputError, self).__init__(e)
if __name__ == '__main__':
try:
r = main()
sys.exit(r)
except InputError as e:
print(e, file=sys.stderr)
sys.exit(2)