update_attempter_android.cc - android_system_update_engine - Gitiles

 //
 // Copyright (C) 2016 The Android Open Source Project
 //
 // 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.
 //

 #include "update_engine/update_attempter_android.h"

 #include <algorithm>
 #include <map>
 #include <utility>

 #include <base/bind.h>
 #include <base/logging.h>
 #include <base/strings/string_number_conversions.h>
 #include <brillo/bind_lambda.h>
 #include <brillo/message_loops/message_loop.h>
 #include <brillo/strings/string_utils.h>

 #include "update_engine/common/constants.h"
 #include "update_engine/common/libcurl_http_fetcher.h"
 #include "update_engine/common/multi_range_http_fetcher.h"
 #include "update_engine/common/utils.h"
 #include "update_engine/daemon_state_android.h"
 #include "update_engine/payload_consumer/download_action.h"
 #include "update_engine/payload_consumer/filesystem_verifier_action.h"
 #include "update_engine/payload_consumer/postinstall_runner_action.h"
 #include "update_engine/update_status_utils.h"

 using base::Bind;
 using base::TimeDelta;
 using base::TimeTicks;
 using std::shared_ptr;
 using std::string;
 using std::vector;

 namespace chromeos_update_engine {

 namespace {

 const char* const kErrorDomain = "update_engine";
 // TODO(deymo): Convert the different errors to a numeric value to report them
 // back on the service error.
 const char* const kGenericError = "generic_error";

 // Log and set the error on the passed ErrorPtr.
 bool LogAndSetError(brillo::ErrorPtr* error,
                     const tracked_objects::Location& location,
                     const string& reason) {
   brillo::Error::AddTo(error, location, kErrorDomain, kGenericError, reason);
   LOG(ERROR) << "Replying with failure: " << location.ToString() << ": "
              << reason;
   return false;
 }

 }  // namespace

 UpdateAttempterAndroid::UpdateAttempterAndroid(
     DaemonStateAndroid* daemon_state,
     PrefsInterface* prefs,
     BootControlInterface* boot_control,
     HardwareInterface* hardware)
     : daemon_state_(daemon_state),
       prefs_(prefs),
       boot_control_(boot_control),
       hardware_(hardware),
       processor_(new ActionProcessor()) {
 }

 UpdateAttempterAndroid::~UpdateAttempterAndroid() {
   // Release ourselves as the ActionProcessor's delegate to prevent
   // re-scheduling the updates due to the processing stopped.
   processor_->set_delegate(nullptr);
 }

 void UpdateAttempterAndroid::Init() {
   // In case of update_engine restart without a reboot we need to restore the
   // reboot needed state.
   if (UpdateCompletedOnThisBoot())
     SetStatusAndNotify(UpdateStatus::UPDATED_NEED_REBOOT);
   else
     SetStatusAndNotify(UpdateStatus::IDLE);
 }

 bool UpdateAttempterAndroid::ApplyPayload(
     const string& payload_url,
     int64_t payload_offset,
     int64_t payload_size,
     const vector<string>& key_value_pair_headers,
     brillo::ErrorPtr* error) {
   if (status_ == UpdateStatus::UPDATED_NEED_REBOOT) {
     return LogAndSetError(
         error, FROM_HERE, "An update already applied, waiting for reboot");
   }
   if (ongoing_update_) {
     return LogAndSetError(
         error, FROM_HERE, "Already processing an update, cancel it first.");
   }
   DCHECK(status_ == UpdateStatus::IDLE);

   std::map<string, string> headers;
   for (const string& key_value_pair : key_value_pair_headers) {
     string key;
     string value;
     if (!brillo::string_utils::SplitAtFirst(
             key_value_pair, "=", &key, &value, false)) {
       return LogAndSetError(
           error, FROM_HERE, "Passed invalid header: " + key_value_pair);
     }
     if (!headers.emplace(key, value).second)
       return LogAndSetError(error, FROM_HERE, "Passed repeated key: " + key);
   }

   // Unique identifier for the payload. An empty string means that the payload
   // can't be resumed.
   string payload_id = (headers[kPayloadPropertyFileHash] +
                        headers[kPayloadPropertyMetadataHash]);

   // Setup the InstallPlan based on the request.
   install_plan_ = InstallPlan();

   install_plan_.download_url = payload_url;
   install_plan_.version = "";
   base_offset_ = payload_offset;
   install_plan_.payload_size = payload_size;
   if (!install_plan_.payload_size) {
     if (!base::StringToUint64(headers[kPayloadPropertyFileSize],
                               &install_plan_.payload_size)) {
       install_plan_.payload_size = 0;
     }
   }
   install_plan_.payload_hash = headers[kPayloadPropertyFileHash];
   if (!base::StringToUint64(headers[kPayloadPropertyMetadataSize],
                             &install_plan_.metadata_size)) {
     install_plan_.metadata_size = 0;
   }
   install_plan_.metadata_signature = "";
   // The |public_key_rsa| key would override the public key stored on disk.
   install_plan_.public_key_rsa = "";

   install_plan_.hash_checks_mandatory = hardware_->IsOfficialBuild();
   install_plan_.is_resume = !payload_id.empty() &&
                             DeltaPerformer::CanResumeUpdate(prefs_, payload_id);
   if (!install_plan_.is_resume) {
     if (!DeltaPerformer::ResetUpdateProgress(prefs_, false)) {
       LOG(WARNING) << "Unable to reset the update progress.";
     }
     if (!prefs_->SetString(kPrefsUpdateCheckResponseHash, payload_id)) {
       LOG(WARNING) << "Unable to save the update check response hash.";
     }
   }
   // The |payload_type| is not used anymore since minor_version 3.
   install_plan_.payload_type = InstallPayloadType::kUnknown;

   install_plan_.source_slot = boot_control_->GetCurrentSlot();
   install_plan_.target_slot = install_plan_.source_slot == 0 ? 1 : 0;
   install_plan_.powerwash_required = false;

   LOG(INFO) << "Using this install plan:";
   install_plan_.Dump();

   BuildUpdateActions();
   SetupDownload();
   cpu_limiter_.StartLimiter();
   SetStatusAndNotify(UpdateStatus::UPDATE_AVAILABLE);

   // Just in case we didn't update boot flags yet, make sure they're updated
   // before any update processing starts. This will start the update process.
   UpdateBootFlags();
   return true;
 }

 bool UpdateAttempterAndroid::SuspendUpdate(brillo::ErrorPtr* error) {
   // TODO(deymo): Implement suspend/resume.
   return LogAndSetError(error, FROM_HERE, "Suspend/resume not implemented");
 }

 bool UpdateAttempterAndroid::ResumeUpdate(brillo::ErrorPtr* error) {
   // TODO(deymo): Implement suspend/resume.
   return LogAndSetError(error, FROM_HERE, "Suspend/resume not implemented");
 }

 bool UpdateAttempterAndroid::CancelUpdate(brillo::ErrorPtr* error) {
   if (status_ == UpdateStatus::IDLE ||
       status_ == UpdateStatus::UPDATED_NEED_REBOOT) {
     return LogAndSetError(error, FROM_HERE, "No ongoing update to cancel.");
   }

   // TODO(deymo): Implement cancel.
   return LogAndSetError(error, FROM_HERE, "Cancel not implemented");
 }

 bool UpdateAttempterAndroid::ResetStatus(brillo::ErrorPtr* error) {
   LOG(INFO) << "Attempting to reset state from "
             << UpdateStatusToString(status_) << " to UpdateStatus::IDLE";

   switch (status_) {
     case UpdateStatus::IDLE:
       return true;

     case UpdateStatus::UPDATED_NEED_REBOOT:  {
       // Remove the reboot marker so that if the machine is rebooted
       // after resetting to idle state, it doesn't go back to
       // UpdateStatus::UPDATED_NEED_REBOOT state.
       bool ret_value = prefs_->Delete(kPrefsUpdateCompletedOnBootId);

       // Update the boot flags so the current slot has higher priority.
       if (!boot_control_->SetActiveBootSlot(boot_control_->GetCurrentSlot()))
         ret_value = false;

       if (!ret_value) {
         return LogAndSetError(
             error,
             FROM_HERE,
             "Failed to reset the status to ");
       }

       SetStatusAndNotify(UpdateStatus::IDLE);
       LOG(INFO) << "Reset status successful";
       return true;
     }

     default:
       return LogAndSetError(
           error,
           FROM_HERE,
           "Reset not allowed in this state. Cancel the ongoing update first");
   }
 }

 void UpdateAttempterAndroid::ProcessingDone(const ActionProcessor* processor,
                                             ErrorCode code) {
   LOG(INFO) << "Processing Done.";

   if (code == ErrorCode::kSuccess) {
     // Update succeeded.
     WriteUpdateCompletedMarker();
     prefs_->SetInt64(kPrefsDeltaUpdateFailures, 0);
     DeltaPerformer::ResetUpdateProgress(prefs_, false);

     LOG(INFO) << "Update successfully applied, waiting to reboot.";
   }

   TerminateUpdateAndNotify(code);
 }

 void UpdateAttempterAndroid::ProcessingStopped(
     const ActionProcessor* processor) {
   TerminateUpdateAndNotify(ErrorCode::kUserCanceled);
 }

 void UpdateAttempterAndroid::ActionCompleted(ActionProcessor* processor,
                                              AbstractAction* action,
                                              ErrorCode code) {
   // Reset download progress regardless of whether or not the download
   // action succeeded.
   const string type = action->Type();
   if (type == DownloadAction::StaticType()) {
     download_progress_ = 0.0;
   }
   if (code != ErrorCode::kSuccess) {
     // If an action failed, the ActionProcessor will cancel the whole thing.
     return;
   }
   if (type == DownloadAction::StaticType()) {
     SetStatusAndNotify(UpdateStatus::FINALIZING);
   }
 }

 void UpdateAttempterAndroid::BytesReceived(uint64_t bytes_progressed,
                                            uint64_t bytes_received,
                                            uint64_t total) {
   double progress = 0.;
   if (total)
     progress = static_cast<double>(bytes_received) / static_cast<double>(total);
   // Self throttle based on progress. Also send notifications if
   // progress is too slow.
   const double kDeltaPercent = 0.01;  // 1%
   if (status_ != UpdateStatus::DOWNLOADING || bytes_received == total ||
       progress - download_progress_ >= kDeltaPercent ||
       TimeTicks::Now() - last_notify_time_ >= TimeDelta::FromSeconds(10)) {
     download_progress_ = progress;
     SetStatusAndNotify(UpdateStatus::DOWNLOADING);
   }
 }

 bool UpdateAttempterAndroid::ShouldCancel(ErrorCode* cancel_reason) {
   // TODO(deymo): Notify the DownloadAction that it should cancel the update
   // download.
   return false;
 }

 void UpdateAttempterAndroid::DownloadComplete() {
   // Nothing needs to be done when the download completes.
 }

 void UpdateAttempterAndroid::UpdateBootFlags() {
   if (updated_boot_flags_) {
     LOG(INFO) << "Already updated boot flags. Skipping.";
     CompleteUpdateBootFlags(true);
     return;
   }
   // This is purely best effort.
   LOG(INFO) << "Marking booted slot as good.";
   if (!boot_control_->MarkBootSuccessfulAsync(
           Bind(&UpdateAttempterAndroid::CompleteUpdateBootFlags,
                base::Unretained(this)))) {
     LOG(ERROR) << "Failed to mark current boot as successful.";
     CompleteUpdateBootFlags(false);
   }
 }

 void UpdateAttempterAndroid::CompleteUpdateBootFlags(bool successful) {
   updated_boot_flags_ = true;
   ScheduleProcessingStart();
 }

 void UpdateAttempterAndroid::ScheduleProcessingStart() {
   LOG(INFO) << "Scheduling an action processor start.";
   brillo::MessageLoop::current()->PostTask(
       FROM_HERE, Bind([this] { this->processor_->StartProcessing(); }));
 }

 void UpdateAttempterAndroid::TerminateUpdateAndNotify(ErrorCode error_code) {
   if (status_ == UpdateStatus::IDLE) {
     LOG(ERROR) << "No ongoing update, but TerminatedUpdate() called.";
     return;
   }

   // Reset cpu shares back to normal.
   cpu_limiter_.StopLimiter();
   download_progress_ = 0.0;
   actions_.clear();
   UpdateStatus new_status =
       (error_code == ErrorCode::kSuccess ? UpdateStatus::UPDATED_NEED_REBOOT
                                          : UpdateStatus::IDLE);
   SetStatusAndNotify(new_status);
   ongoing_update_ = false;

   for (auto observer : daemon_state_->service_observers())
     observer->SendPayloadApplicationComplete(error_code);
 }

 void UpdateAttempterAndroid::SetStatusAndNotify(UpdateStatus status) {
   status_ = status;
   for (auto observer : daemon_state_->service_observers()) {
     observer->SendStatusUpdate(
         0, download_progress_, status_, "", install_plan_.payload_size);
   }
   last_notify_time_ = TimeTicks::Now();
 }

 void UpdateAttempterAndroid::BuildUpdateActions() {
   CHECK(!processor_->IsRunning());
   processor_->set_delegate(this);

   // Actions:
   shared_ptr<InstallPlanAction> install_plan_action(
       new InstallPlanAction(install_plan_));

   LibcurlHttpFetcher* download_fetcher =
       new LibcurlHttpFetcher(&proxy_resolver_, hardware_);
   download_fetcher->set_server_to_check(ServerToCheck::kDownload);
   shared_ptr<DownloadAction> download_action(new DownloadAction(
       prefs_,
       boot_control_,
       hardware_,
       nullptr,                                        // system_state, not used.
       new MultiRangeHttpFetcher(download_fetcher)));  // passes ownership
   shared_ptr<FilesystemVerifierAction> dst_filesystem_verifier_action(
       new FilesystemVerifierAction(boot_control_,
                                    VerifierMode::kVerifyTargetHash));

   shared_ptr<PostinstallRunnerAction> postinstall_runner_action(
       new PostinstallRunnerAction(boot_control_));

   download_action->set_delegate(this);
   download_action_ = download_action;

   actions_.push_back(shared_ptr<AbstractAction>(install_plan_action));
   actions_.push_back(shared_ptr<AbstractAction>(download_action));
   actions_.push_back(
       shared_ptr<AbstractAction>(dst_filesystem_verifier_action));
   actions_.push_back(shared_ptr<AbstractAction>(postinstall_runner_action));

   // Bond them together. We have to use the leaf-types when calling
   // BondActions().
   BondActions(install_plan_action.get(), download_action.get());
   BondActions(download_action.get(), dst_filesystem_verifier_action.get());
   BondActions(dst_filesystem_verifier_action.get(),
               postinstall_runner_action.get());

   // Enqueue the actions.
   for (const shared_ptr<AbstractAction>& action : actions_)
     processor_->EnqueueAction(action.get());
 }

 void UpdateAttempterAndroid::SetupDownload() {
   MultiRangeHttpFetcher* fetcher =
       static_cast<MultiRangeHttpFetcher*>(download_action_->http_fetcher());
   fetcher->ClearRanges();
   if (install_plan_.is_resume) {
     // Resuming an update so fetch the update manifest metadata first.
     int64_t manifest_metadata_size = 0;
     prefs_->GetInt64(kPrefsManifestMetadataSize, &manifest_metadata_size);
     fetcher->AddRange(base_offset_, manifest_metadata_size);
     // If there're remaining unprocessed data blobs, fetch them. Be careful not
     // to request data beyond the end of the payload to avoid 416 HTTP response
     // error codes.
     int64_t next_data_offset = 0;
     prefs_->GetInt64(kPrefsUpdateStateNextDataOffset, &next_data_offset);
     uint64_t resume_offset = manifest_metadata_size + next_data_offset;
     if (!install_plan_.payload_size) {
       fetcher->AddRange(base_offset_ + resume_offset);
     } else if (resume_offset < install_plan_.payload_size) {
       fetcher->AddRange(base_offset_ + resume_offset,
                         install_plan_.payload_size - resume_offset);
     }
   } else {
     if (install_plan_.payload_size) {
       fetcher->AddRange(base_offset_, install_plan_.payload_size);
     } else {
       // If no payload size is passed we assume we read until the end of the
       // stream.
       fetcher->AddRange(base_offset_);
     }
   }
 }

 bool UpdateAttempterAndroid::WriteUpdateCompletedMarker() {
   string boot_id;
   TEST_AND_RETURN_FALSE(utils::GetBootId(&boot_id));
   prefs_->SetString(kPrefsUpdateCompletedOnBootId, boot_id);
   return true;
 }

 bool UpdateAttempterAndroid::UpdateCompletedOnThisBoot() {
   // In case of an update_engine restart without a reboot, we stored the boot_id
   // when the update was completed by setting a pref, so we can check whether
   // the last update was on this boot or a previous one.
   string boot_id;
   TEST_AND_RETURN_FALSE(utils::GetBootId(&boot_id));

   string update_completed_on_boot_id;
   return (prefs_->Exists(kPrefsUpdateCompletedOnBootId) &&
           prefs_->GetString(kPrefsUpdateCompletedOnBootId,
                             &update_completed_on_boot_id) &&
           update_completed_on_boot_id == boot_id);
 }

 }  // namespace chromeos_update_engine
	//
	// Copyright (C) 2016 The Android Open Source Project
	//
	// 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.
	//

	#include "update_engine/update_attempter_android.h"

	#include <algorithm>
	#include <map>
	#include <utility>

	#include <base/bind.h>
	#include <base/logging.h>
	#include <base/strings/string_number_conversions.h>
	#include <brillo/bind_lambda.h>
	#include <brillo/message_loops/message_loop.h>
	#include <brillo/strings/string_utils.h>

	#include "update_engine/common/constants.h"
	#include "update_engine/common/libcurl_http_fetcher.h"
	#include "update_engine/common/multi_range_http_fetcher.h"
	#include "update_engine/common/utils.h"
	#include "update_engine/daemon_state_android.h"
	#include "update_engine/payload_consumer/download_action.h"
	#include "update_engine/payload_consumer/filesystem_verifier_action.h"
	#include "update_engine/payload_consumer/postinstall_runner_action.h"
	#include "update_engine/update_status_utils.h"

	using base::Bind;
	using base::TimeDelta;
	using base::TimeTicks;
	using std::shared_ptr;
	using std::string;
	using std::vector;

	namespace chromeos_update_engine {

	namespace {

	const char* const kErrorDomain = "update_engine";
	// TODO(deymo): Convert the different errors to a numeric value to report them
	// back on the service error.
	const char* const kGenericError = "generic_error";

	// Log and set the error on the passed ErrorPtr.
	bool LogAndSetError(brillo::ErrorPtr* error,
	const tracked_objects::Location& location,
	const string& reason) {
	brillo::Error::AddTo(error, location, kErrorDomain, kGenericError, reason);
	LOG(ERROR) << "Replying with failure: " << location.ToString() << ": "
	<< reason;
	return false;
	}

	} // namespace

	UpdateAttempterAndroid::UpdateAttempterAndroid(
	DaemonStateAndroid* daemon_state,
	PrefsInterface* prefs,
	BootControlInterface* boot_control,
	HardwareInterface* hardware)
	: daemon_state_(daemon_state),
	prefs_(prefs),
	boot_control_(boot_control),
	hardware_(hardware),
	processor_(new ActionProcessor()) {
	}

	UpdateAttempterAndroid::~UpdateAttempterAndroid() {
	// Release ourselves as the ActionProcessor's delegate to prevent
	// re-scheduling the updates due to the processing stopped.
	processor_->set_delegate(nullptr);
	}

	void UpdateAttempterAndroid::Init() {
	// In case of update_engine restart without a reboot we need to restore the
	// reboot needed state.
	if (UpdateCompletedOnThisBoot())
	SetStatusAndNotify(UpdateStatus::UPDATED_NEED_REBOOT);
	else
	SetStatusAndNotify(UpdateStatus::IDLE);
	}

	bool UpdateAttempterAndroid::ApplyPayload(
	const string& payload_url,
	int64_t payload_offset,
	int64_t payload_size,
	const vector<string>& key_value_pair_headers,
	brillo::ErrorPtr* error) {
	if (status_ == UpdateStatus::UPDATED_NEED_REBOOT) {
	return LogAndSetError(
	error, FROM_HERE, "An update already applied, waiting for reboot");
	}
	if (ongoing_update_) {
	return LogAndSetError(
	error, FROM_HERE, "Already processing an update, cancel it first.");
	}
	DCHECK(status_ == UpdateStatus::IDLE);

	std::map<string, string> headers;
	for (const string& key_value_pair : key_value_pair_headers) {
	string key;
	string value;
	if (!brillo::string_utils::SplitAtFirst(
	key_value_pair, "=", &key, &value, false)) {
	return LogAndSetError(
	error, FROM_HERE, "Passed invalid header: " + key_value_pair);
	}
	if (!headers.emplace(key, value).second)
	return LogAndSetError(error, FROM_HERE, "Passed repeated key: " + key);
	}

	// Unique identifier for the payload. An empty string means that the payload
	// can't be resumed.
	string payload_id = (headers[kPayloadPropertyFileHash] +
	headers[kPayloadPropertyMetadataHash]);

	// Setup the InstallPlan based on the request.
	install_plan_ = InstallPlan();

	install_plan_.download_url = payload_url;
	install_plan_.version = "";
	base_offset_ = payload_offset;
	install_plan_.payload_size = payload_size;
	if (!install_plan_.payload_size) {
	if (!base::StringToUint64(headers[kPayloadPropertyFileSize],
	&install_plan_.payload_size)) {
	install_plan_.payload_size = 0;
	}
	}
	install_plan_.payload_hash = headers[kPayloadPropertyFileHash];
	if (!base::StringToUint64(headers[kPayloadPropertyMetadataSize],
	&install_plan_.metadata_size)) {
	install_plan_.metadata_size = 0;
	}
	install_plan_.metadata_signature = "";
	// The \|public_key_rsa\| key would override the public key stored on disk.
	install_plan_.public_key_rsa = "";

	install_plan_.hash_checks_mandatory = hardware_->IsOfficialBuild();
	install_plan_.is_resume = !payload_id.empty() &&
	DeltaPerformer::CanResumeUpdate(prefs_, payload_id);
	if (!install_plan_.is_resume) {
	if (!DeltaPerformer::ResetUpdateProgress(prefs_, false)) {
	LOG(WARNING) << "Unable to reset the update progress.";
	}
	if (!prefs_->SetString(kPrefsUpdateCheckResponseHash, payload_id)) {
	LOG(WARNING) << "Unable to save the update check response hash.";
	}
	}
	// The \|payload_type\| is not used anymore since minor_version 3.
	install_plan_.payload_type = InstallPayloadType::kUnknown;

	install_plan_.source_slot = boot_control_->GetCurrentSlot();
	install_plan_.target_slot = install_plan_.source_slot == 0 ? 1 : 0;
	install_plan_.powerwash_required = false;

	LOG(INFO) << "Using this install plan:";
	install_plan_.Dump();

	BuildUpdateActions();
	SetupDownload();
	cpu_limiter_.StartLimiter();
	SetStatusAndNotify(UpdateStatus::UPDATE_AVAILABLE);

	// Just in case we didn't update boot flags yet, make sure they're updated
	// before any update processing starts. This will start the update process.
	UpdateBootFlags();
	return true;
	}

	bool UpdateAttempterAndroid::SuspendUpdate(brillo::ErrorPtr* error) {
	// TODO(deymo): Implement suspend/resume.
	return LogAndSetError(error, FROM_HERE, "Suspend/resume not implemented");
	}

	bool UpdateAttempterAndroid::ResumeUpdate(brillo::ErrorPtr* error) {
	// TODO(deymo): Implement suspend/resume.
	return LogAndSetError(error, FROM_HERE, "Suspend/resume not implemented");
	}

	bool UpdateAttempterAndroid::CancelUpdate(brillo::ErrorPtr* error) {
	if (status_ == UpdateStatus::IDLE \|\|
	status_ == UpdateStatus::UPDATED_NEED_REBOOT) {
	return LogAndSetError(error, FROM_HERE, "No ongoing update to cancel.");
	}

	// TODO(deymo): Implement cancel.
	return LogAndSetError(error, FROM_HERE, "Cancel not implemented");
	}

	bool UpdateAttempterAndroid::ResetStatus(brillo::ErrorPtr* error) {
	LOG(INFO) << "Attempting to reset state from "
	<< UpdateStatusToString(status_) << " to UpdateStatus::IDLE";

	switch (status_) {
	case UpdateStatus::IDLE:
	return true;

	case UpdateStatus::UPDATED_NEED_REBOOT: {
	// Remove the reboot marker so that if the machine is rebooted
	// after resetting to idle state, it doesn't go back to
	// UpdateStatus::UPDATED_NEED_REBOOT state.
	bool ret_value = prefs_->Delete(kPrefsUpdateCompletedOnBootId);

	// Update the boot flags so the current slot has higher priority.
	if (!boot_control_->SetActiveBootSlot(boot_control_->GetCurrentSlot()))
	ret_value = false;

	if (!ret_value) {
	return LogAndSetError(
	error,
	FROM_HERE,
	"Failed to reset the status to ");
	}

	SetStatusAndNotify(UpdateStatus::IDLE);
	LOG(INFO) << "Reset status successful";
	return true;
	}

	default:
	return LogAndSetError(
	error,
	FROM_HERE,
	"Reset not allowed in this state. Cancel the ongoing update first");
	}
	}

	void UpdateAttempterAndroid::ProcessingDone(const ActionProcessor* processor,
	ErrorCode code) {
	LOG(INFO) << "Processing Done.";

	if (code == ErrorCode::kSuccess) {
	// Update succeeded.
	WriteUpdateCompletedMarker();
	prefs_->SetInt64(kPrefsDeltaUpdateFailures, 0);
	DeltaPerformer::ResetUpdateProgress(prefs_, false);

	LOG(INFO) << "Update successfully applied, waiting to reboot.";
	}

	TerminateUpdateAndNotify(code);
	}

	void UpdateAttempterAndroid::ProcessingStopped(
	const ActionProcessor* processor) {
	TerminateUpdateAndNotify(ErrorCode::kUserCanceled);
	}

	void UpdateAttempterAndroid::ActionCompleted(ActionProcessor* processor,
	AbstractAction* action,
	ErrorCode code) {
	// Reset download progress regardless of whether or not the download
	// action succeeded.
	const string type = action->Type();
	if (type == DownloadAction::StaticType()) {
	download_progress_ = 0.0;
	}
	if (code != ErrorCode::kSuccess) {
	// If an action failed, the ActionProcessor will cancel the whole thing.
	return;
	}
	if (type == DownloadAction::StaticType()) {
	SetStatusAndNotify(UpdateStatus::FINALIZING);
	}
	}

	void UpdateAttempterAndroid::BytesReceived(uint64_t bytes_progressed,
	uint64_t bytes_received,
	uint64_t total) {
	double progress = 0.;
	if (total)
	progress = static_cast<double>(bytes_received) / static_cast<double>(total);
	// Self throttle based on progress. Also send notifications if
	// progress is too slow.
	const double kDeltaPercent = 0.01; // 1%
	if (status_ != UpdateStatus::DOWNLOADING \|\| bytes_received == total \|\|
	progress - download_progress_ >= kDeltaPercent \|\|
	TimeTicks::Now() - last_notify_time_ >= TimeDelta::FromSeconds(10)) {
	download_progress_ = progress;
	SetStatusAndNotify(UpdateStatus::DOWNLOADING);
	}
	}

	bool UpdateAttempterAndroid::ShouldCancel(ErrorCode* cancel_reason) {
	// TODO(deymo): Notify the DownloadAction that it should cancel the update
	// download.
	return false;
	}

	void UpdateAttempterAndroid::DownloadComplete() {
	// Nothing needs to be done when the download completes.
	}

	void UpdateAttempterAndroid::UpdateBootFlags() {
	if (updated_boot_flags_) {
	LOG(INFO) << "Already updated boot flags. Skipping.";
	CompleteUpdateBootFlags(true);
	return;
	}
	// This is purely best effort.
	LOG(INFO) << "Marking booted slot as good.";
	if (!boot_control_->MarkBootSuccessfulAsync(
	Bind(&UpdateAttempterAndroid::CompleteUpdateBootFlags,
	base::Unretained(this)))) {
	LOG(ERROR) << "Failed to mark current boot as successful.";
	CompleteUpdateBootFlags(false);
	}
	}

	void UpdateAttempterAndroid::CompleteUpdateBootFlags(bool successful) {
	updated_boot_flags_ = true;
	ScheduleProcessingStart();
	}

	void UpdateAttempterAndroid::ScheduleProcessingStart() {
	LOG(INFO) << "Scheduling an action processor start.";
	brillo::MessageLoop::current()->PostTask(
	FROM_HERE, Bind([this] { this->processor_->StartProcessing(); }));
	}

	void UpdateAttempterAndroid::TerminateUpdateAndNotify(ErrorCode error_code) {
	if (status_ == UpdateStatus::IDLE) {
	LOG(ERROR) << "No ongoing update, but TerminatedUpdate() called.";
	return;
	}

	// Reset cpu shares back to normal.
	cpu_limiter_.StopLimiter();
	download_progress_ = 0.0;
	actions_.clear();
	UpdateStatus new_status =
	(error_code == ErrorCode::kSuccess ? UpdateStatus::UPDATED_NEED_REBOOT
	: UpdateStatus::IDLE);
	SetStatusAndNotify(new_status);
	ongoing_update_ = false;

	for (auto observer : daemon_state_->service_observers())
	observer->SendPayloadApplicationComplete(error_code);
	}

	void UpdateAttempterAndroid::SetStatusAndNotify(UpdateStatus status) {
	status_ = status;
	for (auto observer : daemon_state_->service_observers()) {
	observer->SendStatusUpdate(
	0, download_progress_, status_, "", install_plan_.payload_size);
	}
	last_notify_time_ = TimeTicks::Now();
	}

	void UpdateAttempterAndroid::BuildUpdateActions() {
	CHECK(!processor_->IsRunning());
	processor_->set_delegate(this);

	// Actions:
	shared_ptr<InstallPlanAction> install_plan_action(
	new InstallPlanAction(install_plan_));

	LibcurlHttpFetcher* download_fetcher =
	new LibcurlHttpFetcher(&proxy_resolver_, hardware_);
	download_fetcher->set_server_to_check(ServerToCheck::kDownload);
	shared_ptr<DownloadAction> download_action(new DownloadAction(
	prefs_,
	boot_control_,
	hardware_,
	nullptr, // system_state, not used.
	new MultiRangeHttpFetcher(download_fetcher))); // passes ownership
	shared_ptr<FilesystemVerifierAction> dst_filesystem_verifier_action(
	new FilesystemVerifierAction(boot_control_,
	VerifierMode::kVerifyTargetHash));

	shared_ptr<PostinstallRunnerAction> postinstall_runner_action(
	new PostinstallRunnerAction(boot_control_));

	download_action->set_delegate(this);
	download_action_ = download_action;

	actions_.push_back(shared_ptr<AbstractAction>(install_plan_action));
	actions_.push_back(shared_ptr<AbstractAction>(download_action));
	actions_.push_back(
	shared_ptr<AbstractAction>(dst_filesystem_verifier_action));
	actions_.push_back(shared_ptr<AbstractAction>(postinstall_runner_action));

	// Bond them together. We have to use the leaf-types when calling
	// BondActions().
	BondActions(install_plan_action.get(), download_action.get());
	BondActions(download_action.get(), dst_filesystem_verifier_action.get());
	BondActions(dst_filesystem_verifier_action.get(),
	postinstall_runner_action.get());

	// Enqueue the actions.
	for (const shared_ptr<AbstractAction>& action : actions_)
	processor_->EnqueueAction(action.get());
	}

	void UpdateAttempterAndroid::SetupDownload() {
	MultiRangeHttpFetcher* fetcher =
	static_cast<MultiRangeHttpFetcher*>(download_action_->http_fetcher());
	fetcher->ClearRanges();
	if (install_plan_.is_resume) {
	// Resuming an update so fetch the update manifest metadata first.
	int64_t manifest_metadata_size = 0;
	prefs_->GetInt64(kPrefsManifestMetadataSize, &manifest_metadata_size);
	fetcher->AddRange(base_offset_, manifest_metadata_size);
	// If there're remaining unprocessed data blobs, fetch them. Be careful not
	// to request data beyond the end of the payload to avoid 416 HTTP response
	// error codes.
	int64_t next_data_offset = 0;
	prefs_->GetInt64(kPrefsUpdateStateNextDataOffset, &next_data_offset);
	uint64_t resume_offset = manifest_metadata_size + next_data_offset;
	if (!install_plan_.payload_size) {
	fetcher->AddRange(base_offset_ + resume_offset);
	} else if (resume_offset < install_plan_.payload_size) {
	fetcher->AddRange(base_offset_ + resume_offset,
	install_plan_.payload_size - resume_offset);
	}
	} else {
	if (install_plan_.payload_size) {
	fetcher->AddRange(base_offset_, install_plan_.payload_size);
	} else {
	// If no payload size is passed we assume we read until the end of the
	// stream.
	fetcher->AddRange(base_offset_);
	}
	}
	}

	bool UpdateAttempterAndroid::WriteUpdateCompletedMarker() {
	string boot_id;
	TEST_AND_RETURN_FALSE(utils::GetBootId(&boot_id));
	prefs_->SetString(kPrefsUpdateCompletedOnBootId, boot_id);
	return true;
	}

	bool UpdateAttempterAndroid::UpdateCompletedOnThisBoot() {
	// In case of an update_engine restart without a reboot, we stored the boot_id
	// when the update was completed by setting a pref, so we can check whether
	// the last update was on this boot or a previous one.
	string boot_id;
	TEST_AND_RETURN_FALSE(utils::GetBootId(&boot_id));

	string update_completed_on_boot_id;
	return (prefs_->Exists(kPrefsUpdateCompletedOnBootId) &&
	prefs_->GetString(kPrefsUpdateCompletedOnBootId,
	&update_completed_on_boot_id) &&
	update_completed_on_boot_id == boot_id);
	}

	} // namespace chromeos_update_engine