AU: Include the old/new kernel/rootfs size/hash in the update metadata.

update_metadata.proto

-// Copyright (c) 2009 The Chromium Authors. All rights reserved.
+// Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Update file format: A delta update file contains all the deltas needed
 // to update a system from one specific version to another specific
 // version. The update format is represented by this struct pseudocode:
 // struct delta_update_file {
 //   char magic[4] = "CrAU";
 //   uint64 file_format_version = 1;
 //   uint64 manifest_size;  // Size of protobuf DeltaArchiveManifest
@@ skipping 66 matching lines @@
 }
 
 message Signatures {
   message Signature {
     optional uint32 version = 1;
     optional bytes data = 2;
   }
   repeated Signature signatures = 1;
 }
 
+message PartitionInfo {
+  optional uint64 size = 1;
+  optional bytes hash = 2;
+}
+
 message DeltaArchiveManifest {
   message InstallOperation {
     enum Type {
       REPLACE = 0;  // Replace destination extents w/ attached data
       REPLACE_BZ = 1;  // Replace destination extents w/ attached bzipped data
       MOVE = 2;  // Move source extents to destination extents
       BSDIFF = 3;  // The data is a bsdiff binary diff
     }
     required Type type = 1;
     // The offset into the delta file (after the protobuf)
@@ skipping 21 matching lines @@
   // (At time of writing) usually 4096
   optional uint32 block_size = 3 [default = 4096];
 
   // If signatures are present, the offset into the blobs, generally
   // tacked onto the end of the file, and the length. We use an offset
   // rather than a bool to allow for more flexibility in future file formats.
   // If either is absent, it means signatures aren't supported in this
   // file.
   optional uint64 signatures_offset = 4;
   optional uint64 signatures_size = 5;
+
+  // Partition data that can be used to validate the update.
+  optional PartitionInfo old_kernel_info = 6;
+  optional PartitionInfo new_kernel_info = 7;
+  optional PartitionInfo old_rootfs_info = 8;
+  optional PartitionInfo new_rootfs_info = 9;
 }