feat(app_update): add OTA init bin

components/app_update/gen_empty_partition.py

@@ -0,0 +1,82 @@
+#!/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)