update_engine/cros/daemon_chromeos.cc

// Copyright 2015 The ChromiumOS Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "update_engine/cros/daemon_chromeos.h"

#include <sysexits.h>

#include <base/functional/bind.h>
#include <base/location.h>
#include <base/logging.h>

#include "update_engine/cros/real_system_state.h"

using brillo::Daemon;
using std::unique_ptr;

namespace chromeos_update_engine {

unique_ptr<DaemonBase> DaemonBase::CreateInstance() {
  return std::make_unique<DaemonChromeOS>();
}

int DaemonChromeOS::OnInit() {
  // Register the |subprocess_| singleton with this Daemon as the signal
  // handler.
  subprocess_.Init(this);

  int exit_code = Daemon::OnInit();
  if (exit_code != EX_OK)
    return exit_code;

  // Initialize update engine global state.
  // TODO(deymo): Move the initialization to a factory method avoiding the
  // explicit re-usage of the |bus| instance, shared between D-Bus service and
  // D-Bus client calls.
  RealSystemState::SetInstance(&system_state_);

  // Create the DBus service.
  dbus_adaptor_.reset(new UpdateEngineAdaptor());
  SystemState::Get()->update_attempter()->AddObserver(dbus_adaptor_.get());

  dbus_adaptor_->RegisterAsync(base::BindOnce(&DaemonChromeOS::OnDBusRegistered,
                                              base::Unretained(this)));
  LOG(INFO) << "Waiting for DBus object to be registered.";
  return EX_OK;
}

void DaemonChromeOS::OnDBusRegistered(bool succeeded) {
  if (!succeeded) {
    LOG(ERROR) << "Registering the UpdateEngineAdaptor";
    QuitWithExitCode(1);
    return;
  }

  // Take ownership of the service now that everything is initialized. We need
  // to this now and not before to avoid exposing a well known DBus service
  // path that doesn't have the service it is supposed to implement.
  if (!dbus_adaptor_->RequestOwnership()) {
    LOG(ERROR) << "Unable to take ownership of the DBus service, is there "
               << "other update_engine daemon running?";
    QuitWithExitCode(1);
    return;
  }

  // Update the telemetry information before starting the updater, to request
  // once and continue caching on boot.
  SystemState::Get()->cros_healthd()->ProbeTelemetryInfo(
      {
          TelemetryCategoryEnum::kNonRemovableBlockDevices,
          TelemetryCategoryEnum::kCpu,
          TelemetryCategoryEnum::kMemory,
          TelemetryCategoryEnum::kSystem,
          TelemetryCategoryEnum::kBus,
      },
      base::BindOnce(
          []() { SystemState::Get()->update_attempter()->StartUpdater(); }));
}

}  // namespace chromeos_update_engine