1//
2// Copyright (C) 2015 The Android Open Source Project
3//
4// Licensed under the Apache License, Version 2.0 (the "License");
5// you may not use this file except in compliance with the License.
6// You may obtain a copy of the License at
7//
8//      http://www.apache.org/licenses/LICENSE-2.0
9//
10// Unless required by applicable law or agreed to in writing, software
11// distributed under the License is distributed on an "AS IS" BASIS,
12// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13// See the License for the specific language governing permissions and
14// limitations under the License.
15//
16
17#ifndef UPDATE_ENGINE_COMMON_BOOT_CONTROL_STUB_H_
18#define UPDATE_ENGINE_COMMON_BOOT_CONTROL_STUB_H_
19
20#include <string>
21
22#include "update_engine/common/boot_control_interface.h"
23
24namespace chromeos_update_engine {
25
26// An implementation of the BootControlInterface that does nothing,
27// typically used when e.g. an underlying HAL implementation cannot be
28// loaded or doesn't exist.
29//
30// You are gauranteed that the implementation of GetNumSlots() method
31// always returns 0. This can be used to identify that this
32// implementation is in use.
33class BootControlStub : public BootControlInterface {
34 public:
35  BootControlStub() = default;
36  ~BootControlStub() = default;
37
38  // BootControlInterface overrides.
39  unsigned int GetNumSlots() const override;
40  BootControlInterface::Slot GetCurrentSlot() const override;
41  bool GetPartitionDevice(const std::string& partition_name,
42                          BootControlInterface::Slot slot,
43                          std::string* device) const override;
44  bool IsSlotBootable(BootControlInterface::Slot slot) const override;
45  bool MarkSlotUnbootable(BootControlInterface::Slot slot) override;
46  bool SetActiveBootSlot(BootControlInterface::Slot slot) override;
47  bool MarkBootSuccessfulAsync(base::Callback<void(bool)> callback) override;
48
49 private:
50  DISALLOW_COPY_AND_ASSIGN(BootControlStub);
51};
52
53}  // namespace chromeos_update_engine
54
55#endif  // UPDATE_ENGINE_COMMON_BOOT_CONTROL_STUB_H_
56