AU: Update status to DOWNLOADING only after receiving some bytes from server.

download_action.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/download_action.h"
 #include <errno.h>
 #include <algorithm>
 #include <string>
 #include <vector>
 #include <glib.h>
@@ skipping 56 matching lines @@
   if (!install_plan_.is_full_update) {
     if (!delta_performer_->OpenKernel(
             install_plan_.kernel_install_path.c_str())) {
       LOG(ERROR) << "Unable to open kernel file "
                  << install_plan_.kernel_install_path.c_str();
       writer_->Close();
       processor_->ActionComplete(this, kActionCodeKernelDeviceOpenError);
       return;
     }
   }
+  if (delegate_) {
+    delegate_->SetDownloadStatus(true);  // Set to active.
+  }
   http_fetcher_->BeginTransfer(install_plan_.download_url);
 }
 
 void DownloadAction::TerminateProcessing() {
   CHECK(writer_);
   CHECK_EQ(writer_->Close(), 0);
   writer_ = NULL;
   http_fetcher_->TerminateTransfer();
+  if (delegate_) {
+    delegate_->SetDownloadStatus(false);  // Set to inactive.
+  }
 }
 
 void DownloadAction::ReceivedBytes(HttpFetcher *fetcher,
                                    const char* bytes,
                                    int length) {
   bytes_received_ += length;
   if (delegate_)
     delegate_->BytesReceived(bytes_received_, install_plan_.size);
   int rc = writer_->Write(bytes, length);
   TEST_AND_RETURN(rc >= 0);
@@ skipping 14 matching lines @@
 
   LOG(INFO) << "FlushLinuxCaches done.";
 }
 }
 
 void DownloadAction::TransferComplete(HttpFetcher *fetcher, bool successful) {
   if (writer_) {
     CHECK_EQ(writer_->Close(), 0) << errno;
     writer_ = NULL;
   }
+  if (delegate_) {
+    delegate_->SetDownloadStatus(false);  // Set to inactive.
+  }
   ActionExitCode code =
       successful ? kActionCodeSuccess : kActionCodeDownloadTransferError;
   if (code == kActionCodeSuccess) {
     // Make sure hash is correct
     omaha_hash_calculator_.Finalize();
     if (omaha_hash_calculator_.hash() != install_plan_.download_hash) {
       LOG(ERROR) << "Download of " << install_plan_.download_url
                  << " failed. Expect hash " << install_plan_.download_hash
                  << " but got hash " << omaha_hash_calculator_.hash();
       code = kActionCodeDownloadHashMismatchError;
     }
   }
 
   FlushLinuxCaches();
 
   // Write the path to the output pipe if we're successful.
   if (code == kActionCodeSuccess && HasOutputPipe())
     SetOutputObject(GetInputObject());
   processor_->ActionComplete(this, code);
 }
 
 };  // namespace {}