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// Copyright 2022 Huawei Cloud Computing Technology Co., Ltd.
//
// 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 INCLUDED_SRC_BUILDTOOL_FILE_SYSTEM_GIT_CAS_HPP
#define INCLUDED_SRC_BUILDTOOL_FILE_SYSTEM_GIT_CAS_HPP
#include <filesystem>
#include <memory>
#include <optional>
#include <shared_mutex>
#include <unordered_map>
#include <vector>
#include "src/buildtool/file_system/git_context.hpp"
#include "src/buildtool/file_system/git_utils.hpp"
class GitCAS;
using GitCASPtr = std::shared_ptr<GitCAS const>;
/// \brief Git CAS that maintains its Git context.
class GitCAS {
public:
static auto Open(std::filesystem::path const& repo_path) noexcept
-> GitCASPtr;
GitCAS() noexcept = default;
~GitCAS() noexcept = default;
// prohibit moves and copies
GitCAS(GitCAS const&) = delete;
GitCAS(GitCAS&& other) = delete;
auto operator=(GitCAS const&) = delete;
auto operator=(GitCAS&& other) = delete;
/// \brief Read object from CAS.
/// \param id The object id.
/// \param is_hex_id Specify whether `id` is hex string or raw.
[[nodiscard]] auto ReadObject(std::string const& id,
bool is_hex_id = false) const noexcept
-> std::optional<std::string>;
/// \brief Read object header from CAS.
/// \param id The object id.
/// \param is_hex_id Specify whether `id` is hex string or raw.
// Use with care. Quote from git2/odb.h:138:
// Note that most backends do not support reading only the header of an
// object, so the whole object will be read and then the header will be
// returned.
[[nodiscard]] auto ReadHeader(std::string const& id,
bool is_hex_id = false) const noexcept
-> std::optional<std::pair<std::size_t, ObjectType>>;
private:
// IMPORTANT: the GitContext needs to be initialized before any git object!
GitContext git_context_{}; // maintains a Git context while CAS is alive
std::unique_ptr<git_odb, decltype(&odb_closer)> odb_{nullptr, odb_closer};
// git folder path of repo
std::filesystem::path git_path_{};
// mutex to guard odb while setting up a "fake" repository; it needs to be
// uniquely owned while wrapping the odb, but then git operations are free
// to share it.
mutable std::shared_mutex mutex_{};
[[nodiscard]] auto OpenODB(std::filesystem::path const& repo_path) noexcept
-> bool;
friend class GitRepo; // allow access to ODB
};
#endif // INCLUDED_SRC_BUILDTOOL_FILE_SYSTEM_GIT_CAS_HPP
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