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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_REPO_HPP
#define INCLUDED_SRC_BUILDTOOL_FILE_SYSTEM_GIT_REPO_HPP
#include "src/buildtool/file_system/git_cas.hpp"
#include "src/buildtool/multithreading/async_map_consumer.hpp"
extern "C" {
using git_repository = struct git_repository;
}
/// \brief Git repository logic.
/// Models both a real repository, owning the underlying ODB
/// (non-thread-safe), as well as a "fake" repository, which only wraps an
/// existing ODB, allowing thread-safe operations.
class GitRepo {
public:
GitRepo() = delete; // no default ctor
// allow only move, no copy
GitRepo(GitRepo const&) = delete;
GitRepo(GitRepo&&) noexcept;
auto operator=(GitRepo const&) = delete;
auto operator=(GitRepo&& other) noexcept -> GitRepo&;
/// \brief Factory to wrap existing open CAS in a "fake" repository.
[[nodiscard]] static auto Open(GitCASPtr git_cas) noexcept
-> std::optional<GitRepo>;
/// \brief Factory to open existing real repository at given location.
[[nodiscard]] static auto Open(
std::filesystem::path const& repo_path) noexcept
-> std::optional<GitRepo>;
/// \brief Factory to initialize and open new real repository at location.
/// Returns nullopt if repository init fails even after repeated tries.
[[nodiscard]] static auto InitAndOpen(
std::filesystem::path const& repo_path,
bool is_bare) noexcept -> std::optional<GitRepo>;
[[nodiscard]] auto GetGitCAS() const noexcept -> GitCASPtr;
[[nodiscard]] auto IsRepoFake() const noexcept -> bool;
~GitRepo() noexcept;
private:
GitCASPtr git_cas_{nullptr};
git_repository* repo_{nullptr};
// default to real repo, as that is non-thread-safe
bool is_repo_fake_{false};
/// \brief Open "fake" repository wrapper for existing CAS.
explicit GitRepo(GitCASPtr git_cas) noexcept;
/// \brief Open real repository at given location.
explicit GitRepo(std::filesystem::path const& repo_path) noexcept;
};
#endif // INCLUDED_SRC_BUILDTOOL_FILE_SYSTEM_GIT_REPO_HPP
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