AU: Verify that the applied delta update matches the server-sent hashes.

update_attempter.cc

 // 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.
 
 #include "update_engine/update_attempter.h"
 
 // From 'man clock_gettime': feature test macro: _POSIX_C_SOURCE >= 199309L
 #ifndef _POSIX_C_SOURCE
 #define _POSIX_C_SOURCE 199309L
 #endif  // _POSIX_C_SOURCE
@@ skipping 501 matching lines @@
   if (omaha_request_params_.delta_okay &&
       prefs_->GetInt64(kPrefsDeltaUpdateFailures, &delta_failures) &&
       delta_failures >= kMaxDeltaUpdateFailures) {
     LOG(WARNING) << "Too many delta update failures, forcing full update.";
     omaha_request_params_.delta_okay = false;
   }
 }
 
 void UpdateAttempter::MarkDeltaUpdateFailure() {
   CHECK(!is_full_update_);
-  // If a delta update fails after the downloading phase, don't try to resume it
-  // the next time.
-  if (status_ > UPDATE_STATUS_DOWNLOADING) {
-    DeltaPerformer::ResetUpdateProgress(prefs_, false);
-  }
+  // Don't try to resume a failed delta update.
+  DeltaPerformer::ResetUpdateProgress(prefs_, false);
   int64_t delta_failures;
   if (!prefs_->GetInt64(kPrefsDeltaUpdateFailures, &delta_failures) ||
       delta_failures < 0) {
     delta_failures = 0;
   }
   prefs_->SetInt64(kPrefsDeltaUpdateFailures, ++delta_failures);
 }
 
 void UpdateAttempter::SetupDownload() {
   MultiHttpFetcher<LibcurlHttpFetcher>* fetcher =
       dynamic_cast<MultiHttpFetcher<LibcurlHttpFetcher>*>(
           download_action_->http_fetcher());
   MultiHttpFetcher<LibcurlHttpFetcher>::RangesVect ranges;
   if (response_handler_action_->install_plan().is_resume) {
     int64_t manifest_metadata_size = 0;
     prefs_->GetInt64(kPrefsManifestMetadataSize, &manifest_metadata_size);
     int64_t next_data_offset = 0;
     prefs_->GetInt64(kPrefsUpdateStateNextDataOffset, &next_data_offset);
     ranges.push_back(make_pair(0, manifest_metadata_size));
     ranges.push_back(make_pair(manifest_metadata_size + next_data_offset, -1));
   } else {
     ranges.push_back(make_pair(0, -1));
   }
   fetcher->set_ranges(ranges);
 }
 
 }  // namespace chromeos_update_engine