payload_dumper.py

#!/usr/bin/env python
import struct
import hashlib
import bz2
import sys

try:
    import lzma
except ImportError:
    from backports import lzma

import update_metadata_pb2 as um

flatten = lambda l: [item for sublist in l for item in sublist]

def u32(x):
    return struct.unpack('>I', x)[0]

def u64(x):
    return struct.unpack('>Q', x)[0]

def verify_contiguous(exts):
    blocks = 0

    for ext in exts:
        if ext.start_block != blocks:
            return False

        blocks += ext.num_blocks

    return True

def data_for_op(op):
    p.seek(data_offset + op.data_offset)
    data = p.read(op.data_length)

    assert hashlib.sha256(data).digest() == op.data_sha256_hash, 'operation data hash mismatch'

    if op.type == op.REPLACE_XZ:
        dec = lzma.LZMADecompressor()
        data = dec.decompress(data) 
    elif op.type == op.REPLACE_BZ:
        dec = bz2.BZ2Decompressor()
        data = dec.decompress(data) 

    return data

def dump_part(part):
    print(part.partition_name)

    out_file = open('%s.img' % part.partition_name, 'wb')
    h = hashlib.sha256()

    for op in part.operations:
        data = data_for_op(op)
        h.update(data)
        out_file.write(data)

    assert h.digest() == part.new_partition_info.hash, 'partition hash mismatch'

p = open(sys.argv[1], 'rb')

magic = p.read(4)
assert magic == b'CrAU'

file_format_version = u64(p.read(8))
assert file_format_version == 2

manifest_size = u64(p.read(8))

metadata_signature_size = 0

if file_format_version > 1:
    metadata_signature_size = u32(p.read(4))

manifest = p.read(manifest_size)
metadata_signature = p.read(metadata_signature_size)

data_offset = p.tell()

dam = um.DeltaArchiveManifest()
dam.ParseFromString(manifest)

for part in dam.partitions:
    for op in part.operations:
        assert op.type in (op.REPLACE, op.REPLACE_BZ, op.REPLACE_XZ), \
                'unsupported op'

    extents = flatten([op.dst_extents for op in part.operations])
    assert verify_contiguous(extents), 'operations do not span full image'

    dump_part(part)

update_metadata_pb2.py

# Generated by the protocol buffer compiler.  DO NOT EDIT!
# source: update_metadata.proto

import sys
_b=sys.version_info[0]<3 and (lambda x:x) or (lambda x:x.encode('latin1'))
from google.protobuf import descriptor as _descriptor
from google.protobuf import message as _message
from google.protobuf import reflection as _reflection
from google.protobuf import symbol_database as _symbol_database
from google.protobuf import descriptor_pb2
# @@protoc_insertion_point(imports)

_sym_db = _symbol_database.Default()




DESCRIPTOR = _descriptor.FileDescriptor(
  name='update_metadata.proto',
  package='chromeos_update_engine',
  syntax='proto2',
  serialized_pb=_b('\n\x15update_metadata.proto\x12\x16\x63hromeos_update_engine\"1\n\x06\x45xtent\x12\x13\n\x0bstart_block\x18\x01 \x01(\x04\x12\x12\n\nnum_blocks\x18\x02 \x01(\x04\"z\n\nSignatures\x12@\n\nsignatures\x18\x01 \x03(\x0b\x32,.chromeos_update_engine.Signatures.Signature\x1a*\n\tSignature\x12\x0f\n\x07version\x18\x01 \x01(\r\x12\x0c\n\x04\x64\x61ta\x18\x02 \x01(\x0c\"+\n\rPartitionInfo\x12\x0c\n\x04size\x18\x01 \x01(\x04\x12\x0c\n\x04hash\x18\x02 \x01(\x0c\"w\n\tImageInfo\x12\r\n\x05\x62oard\x18\x01 \x01(\t\x12\x0b\n\x03key\x18\x02 \x01(\t\x12\x0f\n\x07\x63hannel\x18\x03 \x01(\t\x12\x0f\n\x07version\x18\x04 \x01(\t\x12\x15\n\rbuild_channel\x18\x05 \x01(\t\x12\x15\n\rbuild_version\x18\x06 \x01(\t\"\xd3\x03\n\x10InstallOperation\x12;\n\x04type\x18\x01 \x02(\x0e\x32-.chromeos_update_engine.InstallOperation.Type\x12\x13\n\x0b\x64\x61ta_offset\x18\x02 \x01(\r\x12\x13\n\x0b\x64\x61ta_length\x18\x03 \x01(\r\x12\x33\n\x0bsrc_extents\x18\x04 \x03(\x0b\x32\x1e.chromeos_update_engine.Extent\x12\x12\n\nsrc_length\x18\x05 \x01(\x04\x12\x33\n\x0b\x64st_extents\x18\x06 \x03(\x0b\x32\x1e.chromeos_update_engine.Extent\x12\x12\n\ndst_length\x18\x07 \x01(\x04\x12\x18\n\x10\x64\x61ta_sha256_hash\x18\x08 \x01(\x0c\x12\x17\n\x0fsrc_sha256_hash\x18\t \x01(\x0c\"\x92\x01\n\x04Type\x12\x0b\n\x07REPLACE\x10\x00\x12\x0e\n\nREPLACE_BZ\x10\x01\x12\x08\n\x04MOVE\x10\x02\x12\n\n\x06\x42SDIFF\x10\x03\x12\x0f\n\x0bSOURCE_COPY\x10\x04\x12\x11\n\rSOURCE_BSDIFF\x10\x05\x12\x08\n\x04ZERO\x10\x06\x12\x0b\n\x07\x44ISCARD\x10\x07\x12\x0e\n\nREPLACE_XZ\x10\x08\x12\x0c\n\x08PUFFDIFF\x10\t\"\xa6\x03\n\x0fPartitionUpdate\x12\x16\n\x0epartition_name\x18\x01 \x02(\t\x12\x17\n\x0frun_postinstall\x18\x02 \x01(\x08\x12\x18\n\x10postinstall_path\x18\x03 \x01(\t\x12\x17\n\x0f\x66ilesystem_type\x18\x04 \x01(\t\x12M\n\x17new_partition_signature\x18\x05 \x03(\x0b\x32,.chromeos_update_engine.Signatures.Signature\x12\x41\n\x12old_partition_info\x18\x06 \x01(\x0b\x32%.chromeos_update_engine.PartitionInfo\x12\x41\n\x12new_partition_info\x18\x07 \x01(\x0b\x32%.chromeos_update_engine.PartitionInfo\x12<\n\noperations\x18\x08 \x03(\x0b\x32(.chromeos_update_engine.InstallOperation\x12\x1c\n\x14postinstall_optional\x18\t \x01(\x08\"\xc4\x05\n\x14\x44\x65ltaArchiveManifest\x12\x44\n\x12install_operations\x18\x01 \x03(\x0b\x32(.chromeos_update_engine.InstallOperation\x12K\n\x19kernel_install_operations\x18\x02 \x03(\x0b\x32(.chromeos_update_engine.InstallOperation\x12\x18\n\nblock_size\x18\x03 \x01(\r:\x04\x34\x30\x39\x36\x12\x19\n\x11signatures_offset\x18\x04 \x01(\x04\x12\x17\n\x0fsignatures_size\x18\x05 \x01(\x04\x12>\n\x0fold_kernel_info\x18\x06 \x01(\x0b\x32%.chromeos_update_engine.PartitionInfo\x12>\n\x0fnew_kernel_info\x18\x07 \x01(\x0b\x32%.chromeos_update_engine.PartitionInfo\x12>\n\x0fold_rootfs_info\x18\x08 \x01(\x0b\x32%.chromeos_update_engine.PartitionInfo\x12>\n\x0fnew_rootfs_info\x18\t \x01(\x0b\x32%.chromeos_update_engine.PartitionInfo\x12\x39\n\x0eold_image_info\x18\n \x01(\x0b\x32!.chromeos_update_engine.ImageInfo\x12\x39\n\x0enew_image_info\x18\x0b \x01(\x0b\x32!.chromeos_update_engine.ImageInfo\x12\x18\n\rminor_version\x18\x0c \x01(\r:\x01\x30\x12;\n\npartitions\x18\r \x03(\x0b\x32\'.chromeos_update_engine.PartitionUpdateB\x02H\x03')
)



_INSTALLOPERATION_TYPE = _descriptor.EnumDescriptor(
  name='Type',
  full_name='chromeos_update_engine.InstallOperation.Type',
  filename=None,
  file=DESCRIPTOR,
  values=[
    _descriptor.EnumValueDescriptor(
      name='REPLACE', index=0, number=0,
      options=None,
      type=None),
    _descriptor.EnumValueDescriptor(
      name='REPLACE_BZ', index=1, number=1,
      options=None,
      type=None),
    _descriptor.EnumValueDescriptor(
      name='MOVE', index=2, number=2,
      options=None,
      type=None),
    _descriptor.EnumValueDescriptor(
      name='BSDIFF', index=3, number=3,
      options=None,
      type=None),
    _descriptor.EnumValueDescriptor(
      name='SOURCE_COPY', index=4, number=4,
      options=None,
      type=None),
    _descriptor.EnumValueDescriptor(
      name='SOURCE_BSDIFF', index=5, number=5,
      options=None,
      type=None),
    _descriptor.EnumValueDescriptor(
      name='ZERO', index=6, number=6,
      options=None,
      type=None),
    _descriptor.EnumValueDescriptor(
      name='DISCARD', index=7, number=7,
      options=None,
      type=None),
    _descriptor.EnumValueDescriptor(
      name='REPLACE_XZ', index=8, number=8,
      options=None,
      type=None),
    _descriptor.EnumValueDescriptor(
      name='PUFFDIFF', index=9, number=9,
      options=None,
      type=None),
  ],
  containing_type=None,
  options=None,
  serialized_start=712,
  serialized_end=858,
)
_sym_db.RegisterEnumDescriptor(_INSTALLOPERATION_TYPE)


_EXTENT = _descriptor.Descriptor(
  name='Extent',
  full_name='chromeos_update_engine.Extent',
  filename=None,
  file=DESCRIPTOR,
  containing_type=None,
  fields=[
    _descriptor.FieldDescriptor(
      name='start_block', full_name='chromeos_update_engine.Extent.start_block', index=0,
      number=1, type=4, cpp_type=4, label=1,
      has_default_value=False, default_value=0,
      message_type=None, enum_type=None, containing_type=None,
      is_extension=False, extension_scope=None,
      options=None),
    _descriptor.FieldDescriptor(
      name='num_blocks', full_name='chromeos_update_engine.Extent.num_blocks', index=1,
      number=2, type=4, cpp_type=4, label=1,
      has_default_value=False, default_value=0,
      message_type=None, enum_type=None, containing_type=None,
      is_extension=False, extension_scope=None,
      options=None),
  ],
  extensions=[
  ],
  nested_types=[],
  enum_types=[
  ],
  options=None,
  is_extendable=False,
  syntax='proto2',
  extension_ranges=[],
  oneofs=[
  ],
  serialized_start=49,
  serialized_end=98,
)


_SIGNATURES_SIGNATURE = _descriptor.Descriptor(
  name='Signature',
  full_name='chromeos_update_engine.Signatures.Signature',
  filename=None,
  file=DESCRIPTOR,
  containing_type=None,
  fields=[
    _descriptor.FieldDescriptor(
      name='version', full_name='chromeos_update_engine.Signatures.Signature.version', index=0,
      number=1, type=13, cpp_type=3, label=1,
      has_default_value=False, default_value=0,
      message_type=None, enum_type=None, containing_type=None,
      is_extension=False, extension_scope=None,
      options=None),
    _descriptor.FieldDescriptor(
      name='data', full_name='chromeos_update_engine.Signatures.Signature.data', index=1,
      number=2, type=12, cpp_type=9, label=1,
      has_default_value=False, default_value=_b(""),
      message_type=None, enum_type=None, containing_type=None,
      is_extension=False, extension_scope=None,
      options=None),
  ],
  extensions=[
  ],
  nested_types=[],
  enum_types=[
  ],
  options=None,
  is_extendable=False,
  syntax='proto2',
  extension_ranges=[],
  oneofs=[
  ],
  serialized_start=180,
  serialized_end=222,
)

_SIGNATURES = _descriptor.Descriptor(
  name='Signatures',
  full_name='chromeos_update_engine.Signatures',
  filename=None,
  file=DESCRIPTOR,
  containing_type=None,
  fields=[
    _descriptor.FieldDescriptor(
      name='signatures', full_name='chromeos_update_engine.Signatures.signatures', index=0,
      number=1, type=11, cpp_type=10, label=3,
      has_default_value=False, default_value=[],
      message_type=None, enum_type=None, containing_type=None,
      is_extension=False, extension_scope=None,
      options=None),
  ],
  extensions=[
  ],
  nested_types=[_SIGNATURES_SIGNATURE, ],
  enum_types=[
  ],
  options=None,
  is_extendable=False,
  syntax='proto2',
  extension_ranges=[],
  oneofs=[
  ],
  serialized_start=100,
  serialized_end=222,
)


_PARTITIONINFO = _descriptor.Descriptor(
  name='PartitionInfo',
  full_name='chromeos_update_engine.PartitionInfo',
  filename=None,
  file=DESCRIPTOR,
  containing_type=None,
  fields=[
    _descriptor.FieldDescriptor(
      name='size', full_name='chromeos_update_engine.PartitionInfo.size', index=0,
      number=1, type=4, cpp_type=4, label=1,
      has_default_value=False, default_value=0,
      message_type=None, enum_type=None, containing_type=None,
      is_extension=False, extension_scope=None,
      options=None),
    _descriptor.FieldDescriptor(
      name='hash', full_name='chromeos_update_engine.PartitionInfo.hash', index=1,
      number=2, type=12, cpp_type=9, label=1,
      has_default_value=False, default_value=_b(""),
      message_type=None, enum_type=None, containing_type=None,
      is_extension=False, extension_scope=None,
      options=None),
  ],
  extensions=[
  ],
  nested_types=[],
  enum_types=[
  ],
  options=None,
  is_extendable=False,
  syntax='proto2',
  extension_ranges=[],
  oneofs=[
  ],
  serialized_start=224,
  serialized_end=267,
)


_IMAGEINFO = _descriptor.Descriptor(
  name='ImageInfo',
  full_name='chromeos_update_engine.ImageInfo',
  filename=None,
  file=DESCRIPTOR,
  containing_type=None,
  fields=[
    _descriptor.FieldDescriptor(
      name='board', full_name='chromeos_update_engine.ImageInfo.board', index=0,
      number=1, type=9, cpp_type=9, label=1,
      has_default_value=False, default_value=_b("").decode('utf-8'),
      message_type=None, enum_type=None, containing_type=None,
      is_extension=False, extension_scope=None,
      options=None),
    _descriptor.FieldDescriptor(
      name='key', full_name='chromeos_update_engine.ImageInfo.key', index=1,
      number=2, type=9, cpp_type=9, label=1,
      has_default_value=False, default_value=_b("").decode('utf-8'),
      message_type=None, enum_type=None, containing_type=None,
      is_extension=False, extension_scope=None,
      options=None),
    _descriptor.FieldDescriptor(
      name='channel', full_name='chromeos_update_engine.ImageInfo.channel', index=2,
      number=3, type=9, cpp_type=9, label=1,
      has_default_value=False, default_value=_b("").decode('utf-8'),
      message_type=None, enum_type=None, containing_type=None,
      is_extension=False, extension_scope=None,
      options=None),
    _descriptor.FieldDescriptor(
      name='version', full_name='chromeos_update_engine.ImageInfo.version', index=3,
      number=4, type=9, cpp_type=9, label=1,
      has_default_value=False, default_value=_b("").decode('utf-8'),
      message_type=None, enum_type=None, containing_type=None,
      is_extension=False, extension_scope=None,
      options=None),
    _descriptor.FieldDescriptor(
      name='build_channel', full_name='chromeos_update_engine.ImageInfo.build_channel', index=4,
      number=5, type=9, cpp_type=9, label=1,
      has_default_value=False, default_value=_b("").decode('utf-8'),
      message_type=None, enum_type=None, containing_type=None,
      is_extension=False, extension_scope=None,
      options=None),
    _descriptor.FieldDescriptor(
      name='build_version', full_name='chromeos_update_engine.ImageInfo.build_version', index=5,
      number=6, type=9, cpp_type=9, label=1,
      has_default_value=False, default_value=_b("").decode('utf-8'),
      message_type=None, enum_type=None, containing_type=None,
      is_extension=False, extension_scope=None,
      options=None),
  ],
  extensions=[
  ],
  nested_types=[],
  enum_types=[
  ],
  options=None,
  is_extendable=False,
  syntax='proto2',
  extension_ranges=[],
  oneofs=[
  ],
  serialized_start=269,
  serialized_end=388,
)


_INSTALLOPERATION = _descriptor.Descriptor(
  name='InstallOperation',
  full_name='chromeos_update_engine.InstallOperation',
  filename=None,
  file=DESCRIPTOR,
  containing_type=None,
  fields=[
    _descriptor.FieldDescriptor(
      name='type', full_name='chromeos_update_engine.InstallOperation.type', index=0,
      number=1, type=14, cpp_type=8, label=2,
      has_default_value=False, default_value=0,
      message_type=None, enum_type=None, containing_type=None,
      is_extension=False, extension_scope=None,
      options=None),
    _descriptor.FieldDescriptor(
      name='data_offset', full_name='chromeos_update_engine.InstallOperation.data_offset', index=1,
      number=2, type=13, cpp_type=3, label=1,
      has_default_value=False, default_value=0,
      message_type=None, enum_type=None, containing_type=None,
      is_extension=False, extension_scope=None,
      options=None),
    _descriptor.FieldDescriptor(
      name='data_length', full_name='chromeos_update_engine.InstallOperation.data_length', index=2,
      number=3, type=13, cpp_type=3, label=1,
      has_default_value=False, default_value=0,
      message_type=None, enum_type=None, containing_type=None,
      is_extension=False, extension_scope=None,
      options=None),
    _descriptor.FieldDescriptor(
      name='src_extents', full_name='chromeos_update_engine.InstallOperation.src_extents', index=3,
      number=4, type=11, cpp_type=10, label=3,
      has_default_value=False, default_value=[],
      message_type=None, enum_type=None, containing_type=None,
      is_extension=False, extension_scope=None,
      options=None),
    _descriptor.FieldDescriptor(
      name='src_length', full_name='chromeos_update_engine.InstallOperation.src_length', index=4,
      number=5, type=4, cpp_type=4, label=1,
      has_default_value=False, default_value=0,
      message_type=None, enum_type=None, containing_type=None,
      is_extension=False, extension_scope=None,
      options=None),
    _descriptor.FieldDescriptor(
      name='dst_extents', full_name='chromeos_update_engine.InstallOperation.dst_extents', index=5,
      number=6, type=11, cpp_type=10, label=3,
      has_default_value=False, default_value=[],
      message_type=None, enum_type=None, containing_type=None,
      is_extension=False, extension_scope=None,
      options=None),
    _descriptor.FieldDescriptor(
      name='dst_length', full_name='chromeos_update_engine.InstallOperation.dst_length', index=6,
      number=7, type=4, cpp_type=4, label=1,
      has_default_value=False, default_value=0,
      message_type=None, enum_type=None, containing_type=None,
      is_extension=False, extension_scope=None,
      options=None),
    _descriptor.FieldDescriptor(
      name='data_sha256_hash', full_name='chromeos_update_engine.InstallOperation.data_sha256_hash', index=7,
      number=8, type=12, cpp_type=9, label=1,
      has_default_value=False, default_value=_b(""),
      message_type=None, enum_type=None, containing_type=None,
      is_extension=False, extension_scope=None,
      options=None),
    _descriptor.FieldDescriptor(
      name='src_sha256_hash', full_name='chromeos_update_engine.InstallOperation.src_sha256_hash', index=8,
      number=9, type=12, cpp_type=9, label=1,
      has_default_value=False, default_value=_b(""),
      message_type=None, enum_type=None, containing_type=None,
      is_extension=False, extension_scope=None,
      options=None),
  ],
  extensions=[
  ],
  nested_types=[],
  enum_types=[
    _INSTALLOPERATION_TYPE,
  ],
  options=None,
  is_extendable=False,
  syntax='proto2',
  extension_ranges=[],
  oneofs=[
  ],
  serialized_start=391,
  serialized_end=858,
)


_PARTITIONUPDATE = _descriptor.Descriptor(
  name='PartitionUpdate',
  full_name='chromeos_update_engine.PartitionUpdate',
  filename=None,
  file=DESCRIPTOR,
  containing_type=None,
  fields=[
    _descriptor.FieldDescriptor(
      name='partition_name', full_name='chromeos_update_engine.PartitionUpdate.partition_name', index=0,
      number=1, type=9, cpp_type=9, label=2,
      has_default_value=False, default_value=_b("").decode('utf-8'),
      message_type=None, enum_type=None, containing_type=None,
      is_extension=False, extension_scope=None,
      options=None),
    _descriptor.FieldDescriptor(
      name='run_postinstall', full_name='chromeos_update_engine.PartitionUpdate.run_postinstall', index=1,
      number=2, type=8, cpp_type=7, label=1,
      has_default_value=False, default_value=False,
      message_type=None, enum_type=None, containing_type=None,
      is_extension=False, extension_scope=None,
      options=None),
    _descriptor.FieldDescriptor(
      name='postinstall_path', full_name='chromeos_update_engine.PartitionUpdate.postinstall_path', index=2,
      number=3, type=9, cpp_type=9, label=1,
      has_default_value=False, default_value=_b("").decode('utf-8'),
      message_type=None, enum_type=None, containing_type=None,
      is_extension=False, extension_scope=None,
      options=None),
    _descriptor.FieldDescriptor(
      name='filesystem_type', full_name='chromeos_update_engine.PartitionUpdate.filesystem_type', index=3,
      number=4, type=9, cpp_type=9, label=1,
      has_default_value=False, default_value=_b("").decode('utf-8'),
      message_type=None, enum_type=None, containing_type=None,
      is_extension=False, extension_scope=None,
      options=None),
    _descriptor.FieldDescriptor(
      name='new_partition_signature', full_name='chromeos_update_engine.PartitionUpdate.new_partition_signature', index=4,
      number=5, type=11, cpp_type=10, label=3,
      has_default_value=False, default_value=[],
      message_type=None, enum_type=None, containing_type=None,
      is_extension=False, extension_scope=None,
      options=None),
    _descriptor.FieldDescriptor(
      name='old_partition_info', full_name='chromeos_update_engine.PartitionUpdate.old_partition_info', index=5,
      number=6, type=11, cpp_type=10, label=1,
      has_default_value=False, default_value=None,
      message_type=None, enum_type=None, containing_type=None,
      is_extension=False, extension_scope=None,
      options=None),
    _descriptor.FieldDescriptor(
      name='new_partition_info', full_name='chromeos_update_engine.PartitionUpdate.new_partition_info', index=6,
      number=7, type=11, cpp_type=10, label=1,
      has_default_value=False, default_value=None,
      message_type=None, enum_type=None, containing_type=None,
      is_extension=False, extension_scope=None,
      options=None),
    _descriptor.FieldDescriptor(
      name='operations', full_name='chromeos_update_engine.PartitionUpdate.operations', index=7,
      number=8, type=11, cpp_type=10, label=3,
      has_default_value=False, default_value=[],
      message_type=None, enum_type=None, containing_type=None,
      is_extension=False, extension_scope=None,
      options=None),
    _descriptor.FieldDescriptor(
      name='postinstall_optional', full_name='chromeos_update_engine.PartitionUpdate.postinstall_optional', index=8,
      number=9, type=8, cpp_type=7, label=1,
      has_default_value=False, default_value=False,
      message_type=None, enum_type=None, containing_type=None,
      is_extension=False, extension_scope=None,
      options=None),
  ],
  extensions=[
  ],
  nested_types=[],
  enum_types=[
  ],
  options=None,
  is_extendable=False,
  syntax='proto2',
  extension_ranges=[],
  oneofs=[
  ],
  serialized_start=861,
  serialized_end=1283,
)


_DELTAARCHIVEMANIFEST = _descriptor.Descriptor(
  name='DeltaArchiveManifest',
  full_name='chromeos_update_engine.DeltaArchiveManifest',
  filename=None,
  file=DESCRIPTOR,
  containing_type=None,
  fields=[
    _descriptor.FieldDescriptor(
      name='install_operations', full_name='chromeos_update_engine.DeltaArchiveManifest.install_operations', index=0,
      number=1, type=11, cpp_type=10, label=3,
      has_default_value=False, default_value=[],
      message_type=None, enum_type=None, containing_type=None,
      is_extension=False, extension_scope=None,
      options=None),
    _descriptor.FieldDescriptor(
      name='kernel_install_operations', full_name='chromeos_update_engine.DeltaArchiveManifest.kernel_install_operations', index=1,
      number=2, type=11, cpp_type=10, label=3,
      has_default_value=False, default_value=[],
      message_type=None, enum_type=None, containing_type=None,
      is_extension=False, extension_scope=None,
      options=None),
    _descriptor.FieldDescriptor(
      name='block_size', full_name='chromeos_update_engine.DeltaArchiveManifest.block_size', index=2,
      number=3, type=13, cpp_type=3, label=1,
      has_default_value=True, default_value=4096,
      message_type=None, enum_type=None, containing_type=None,
      is_extension=False, extension_scope=None,
      options=None),
    _descriptor.FieldDescriptor(
      name='signatures_offset', full_name='chromeos_update_engine.DeltaArchiveManifest.signatures_offset', index=3,
      number=4, type=4, cpp_type=4, label=1,
      has_default_value=False, default_value=0,
      message_type=None, enum_type=None, containing_type=None,
      is_extension=False, extension_scope=None,
      options=None),
    _descriptor.FieldDescriptor(
      name='signatures_size', full_name='chromeos_update_engine.DeltaArchiveManifest.signatures_size', index=4,
      number=5, type=4, cpp_type=4, label=1,
      has_default_value=False, default_value=0,
      message_type=None, enum_type=None, containing_type=None,
      is_extension=False, extension_scope=None,
      options=None),
    _descriptor.FieldDescriptor(
      name='old_kernel_info', full_name='chromeos_update_engine.DeltaArchiveManifest.old_kernel_info', index=5,
      number=6, type=11, cpp_type=10, label=1,
      has_default_value=False, default_value=None,
      message_type=None, enum_type=None, containing_type=None,
      is_extension=False, extension_scope=None,
      options=None),
    _descriptor.FieldDescriptor(
      name='new_kernel_info', full_name='chromeos_update_engine.DeltaArchiveManifest.new_kernel_info', index=6,
      number=7, type=11, cpp_type=10, label=1,
      has_default_value=False, default_value=None,
      message_type=None, enum_type=None, containing_type=None,
      is_extension=False, extension_scope=None,
      options=None),
    _descriptor.FieldDescriptor(
      name='old_rootfs_info', full_name='chromeos_update_engine.DeltaArchiveManifest.old_rootfs_info', index=7,
      number=8, type=11, cpp_type=10, label=1,
      has_default_value=False, default_value=None,
      message_type=None, enum_type=None, containing_type=None,
      is_extension=False, extension_scope=None,
      options=None),
    _descriptor.FieldDescriptor(
      name='new_rootfs_info', full_name='chromeos_update_engine.DeltaArchiveManifest.new_rootfs_info', index=8,
      number=9, type=11, cpp_type=10, label=1,
      has_default_value=False, default_value=None,
      message_type=None, enum_type=None, containing_type=None,
      is_extension=False, extension_scope=None,
      options=None),
    _descriptor.FieldDescriptor(
      name='old_image_info', full_name='chromeos_update_engine.DeltaArchiveManifest.old_image_info', index=9,
      number=10, type=11, cpp_type=10, label=1,
      has_default_value=False, default_value=None,
      message_type=None, enum_type=None, containing_type=None,
      is_extension=False, extension_scope=None,
      options=None),
    _descriptor.FieldDescriptor(
      name='new_image_info', full_name='chromeos_update_engine.DeltaArchiveManifest.new_image_info', index=10,
      number=11, type=11, cpp_type=10, label=1,
      has_default_value=False, default_value=None,
      message_type=None, enum_type=None, containing_type=None,
      is_extension=False, extension_scope=None,
      options=None),
    _descriptor.FieldDescriptor(
      name='minor_version', full_name='chromeos_update_engine.DeltaArchiveManifest.minor_version', index=11,
      number=12, type=13, cpp_type=3, label=1,
      has_default_value=True, default_value=0,
      message_type=None, enum_type=None, containing_type=None,
      is_extension=False, extension_scope=None,
      options=None),
    _descriptor.FieldDescriptor(
      name='partitions', full_name='chromeos_update_engine.DeltaArchiveManifest.partitions', index=12,
      number=13, type=11, cpp_type=10, label=3,
      has_default_value=False, default_value=[],
      message_type=None, enum_type=None, containing_type=None,
      is_extension=False, extension_scope=None,
      options=None),
  ],
  extensions=[
  ],
  nested_types=[],
  enum_types=[
  ],
  options=None,
  is_extendable=False,
  syntax='proto2',
  extension_ranges=[],
  oneofs=[
  ],
  serialized_start=1286,
  serialized_end=1994,
)

_SIGNATURES_SIGNATURE.containing_type = _SIGNATURES
_SIGNATURES.fields_by_name['signatures'].message_type = _SIGNATURES_SIGNATURE
_INSTALLOPERATION.fields_by_name['type'].enum_type = _INSTALLOPERATION_TYPE
_INSTALLOPERATION.fields_by_name['src_extents'].message_type = _EXTENT
_INSTALLOPERATION.fields_by_name['dst_extents'].message_type = _EXTENT
_INSTALLOPERATION_TYPE.containing_type = _INSTALLOPERATION
_PARTITIONUPDATE.fields_by_name['new_partition_signature'].message_type = _SIGNATURES_SIGNATURE
_PARTITIONUPDATE.fields_by_name['old_partition_info'].message_type = _PARTITIONINFO
_PARTITIONUPDATE.fields_by_name['new_partition_info'].message_type = _PARTITIONINFO
_PARTITIONUPDATE.fields_by_name['operations'].message_type = _INSTALLOPERATION
_DELTAARCHIVEMANIFEST.fields_by_name['install_operations'].message_type = _INSTALLOPERATION
_DELTAARCHIVEMANIFEST.fields_by_name['kernel_install_operations'].message_type = _INSTALLOPERATION
_DELTAARCHIVEMANIFEST.fields_by_name['old_kernel_info'].message_type = _PARTITIONINFO
_DELTAARCHIVEMANIFEST.fields_by_name['new_kernel_info'].message_type = _PARTITIONINFO
_DELTAARCHIVEMANIFEST.fields_by_name['old_rootfs_info'].message_type = _PARTITIONINFO
_DELTAARCHIVEMANIFEST.fields_by_name['new_rootfs_info'].message_type = _PARTITIONINFO
_DELTAARCHIVEMANIFEST.fields_by_name['old_image_info'].message_type = _IMAGEINFO
_DELTAARCHIVEMANIFEST.fields_by_name['new_image_info'].message_type = _IMAGEINFO
_DELTAARCHIVEMANIFEST.fields_by_name['partitions'].message_type = _PARTITIONUPDATE
DESCRIPTOR.message_types_by_name['Extent'] = _EXTENT
DESCRIPTOR.message_types_by_name['Signatures'] = _SIGNATURES
DESCRIPTOR.message_types_by_name['PartitionInfo'] = _PARTITIONINFO
DESCRIPTOR.message_types_by_name['ImageInfo'] = _IMAGEINFO
DESCRIPTOR.message_types_by_name['InstallOperation'] = _INSTALLOPERATION
DESCRIPTOR.message_types_by_name['PartitionUpdate'] = _PARTITIONUPDATE
DESCRIPTOR.message_types_by_name['DeltaArchiveManifest'] = _DELTAARCHIVEMANIFEST
_sym_db.RegisterFileDescriptor(DESCRIPTOR)

Extent = _reflection.GeneratedProtocolMessageType('Extent', (_message.Message,), dict(
  DESCRIPTOR = _EXTENT,
  __module__ = 'update_metadata_pb2'
  # @@protoc_insertion_point(class_scope:chromeos_update_engine.Extent)
  ))
_sym_db.RegisterMessage(Extent)

Signatures = _reflection.GeneratedProtocolMessageType('Signatures', (_message.Message,), dict(

  Signature = _reflection.GeneratedProtocolMessageType('Signature', (_message.Message,), dict(
    DESCRIPTOR = _SIGNATURES_SIGNATURE,
    __module__ = 'update_metadata_pb2'
    # @@protoc_insertion_point(class_scope:chromeos_update_engine.Signatures.Signature)
    ))
  ,
  DESCRIPTOR = _SIGNATURES,
  __module__ = 'update_metadata_pb2'
  # @@protoc_insertion_point(class_scope:chromeos_update_engine.Signatures)
  ))
_sym_db.RegisterMessage(Signatures)
_sym_db.RegisterMessage(Signatures.Signature)

PartitionInfo = _reflection.GeneratedProtocolMessageType('PartitionInfo', (_message.Message,), dict(
  DESCRIPTOR = _PARTITIONINFO,
  __module__ = 'update_metadata_pb2'
  # @@protoc_insertion_point(class_scope:chromeos_update_engine.PartitionInfo)
  ))
_sym_db.RegisterMessage(PartitionInfo)

ImageInfo = _reflection.GeneratedProtocolMessageType('ImageInfo', (_message.Message,), dict(
  DESCRIPTOR = _IMAGEINFO,
  __module__ = 'update_metadata_pb2'
  # @@protoc_insertion_point(class_scope:chromeos_update_engine.ImageInfo)
  ))
_sym_db.RegisterMessage(ImageInfo)

InstallOperation = _reflection.GeneratedProtocolMessageType('InstallOperation', (_message.Message,), dict(
  DESCRIPTOR = _INSTALLOPERATION,
  __module__ = 'update_metadata_pb2'
  # @@protoc_insertion_point(class_scope:chromeos_update_engine.InstallOperation)
  ))
_sym_db.RegisterMessage(InstallOperation)

PartitionUpdate = _reflection.GeneratedProtocolMessageType('PartitionUpdate', (_message.Message,), dict(
  DESCRIPTOR = _PARTITIONUPDATE,
  __module__ = 'update_metadata_pb2'
  # @@protoc_insertion_point(class_scope:chromeos_update_engine.PartitionUpdate)
  ))
_sym_db.RegisterMessage(PartitionUpdate)

DeltaArchiveManifest = _reflection.GeneratedProtocolMessageType('DeltaArchiveManifest', (_message.Message,), dict(
  DESCRIPTOR = _DELTAARCHIVEMANIFEST,
  __module__ = 'update_metadata_pb2'
  # @@protoc_insertion_point(class_scope:chromeos_update_engine.DeltaArchiveManifest)
  ))
_sym_db.RegisterMessage(DeltaArchiveManifest)


DESCRIPTOR.has_options = True
DESCRIPTOR._options = _descriptor._ParseOptions(descriptor_pb2.FileOptions(), _b('H\003'))
# @@protoc_insertion_point(module_scope)