payload_generator/fake_filesystem.h

//
// Copyright (C) 2015 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.
//

#ifndef UPDATE_ENGINE_PAYLOAD_GENERATOR_FAKE_FILESYSTEM_H_
#define UPDATE_ENGINE_PAYLOAD_GENERATOR_FAKE_FILESYSTEM_H_

// A fake filesystem interface implementation allowing the user to add arbitrary
// files/metadata.

#include "update_engine/payload_generator/filesystem_interface.h"

#include <string>
#include <vector>

#include "update_engine/update_metadata.pb.h"

namespace chromeos_update_engine {

class FakeFilesystem : public FilesystemInterface {
 public:
  FakeFilesystem(uint64_t block_size, uint64_t block_count);
  virtual ~FakeFilesystem() = default;

  // FilesystemInterface overrides.
  size_t GetBlockSize() const override;
  size_t GetBlockCount() const override;
  bool GetFiles(std::vector<File>* files) const override;
  bool LoadSettings(chromeos::KeyValueStore* store) const override;

  // Fake methods.

  // Add a file to the list of fake files.
  void AddFile(const std::string& filename, const std::vector<Extent> extents);

  // Sets the PAYLOAD_MINOR_VERSION key stored by LoadSettings(). Use a negative
  // value to produce an error in LoadSettings().
  void SetMinorVersion(int minor_version) {
    minor_version_ = minor_version;
  }

 private:
  FakeFilesystem() = default;

  uint64_t block_size_;
  uint64_t block_count_;
  int minor_version_{-1};

  std::vector<File> files_;

  DISALLOW_COPY_AND_ASSIGN(FakeFilesystem);
};

}  // namespace chromeos_update_engine

#endif  // UPDATE_ENGINE_PAYLOAD_GENERATOR_FAKE_FILESYSTEM_H_