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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.
#include <src/buildtool/file_system/git_repo.hpp>
#include "src/buildtool/logging/logger.hpp"
#include "src/utils/cpp/path.hpp"
extern "C" {
#include <git2.h>
}
namespace {
constexpr std::size_t kWaitTime{2}; // time in ms between tries for git locks
[[nodiscard]] auto GitLastError() noexcept -> std::string {
git_error const* err{nullptr};
if ((err = git_error_last()) != nullptr and err->message != nullptr) {
return fmt::format("error code {}: {}", err->klass, err->message);
}
return "<unknown error>";
}
} // namespace
auto GitRepo::Open(GitCASPtr git_cas) noexcept -> std::optional<GitRepo> {
#ifdef BOOTSTRAP_BUILD_TOOL
return std::nullopt;
#else
auto repo = GitRepo(std::move(git_cas));
if (repo.repo_ == nullptr) {
return std::nullopt;
}
return repo;
#endif // BOOTSTRAP_BUILD_TOOL
}
auto GitRepo::Open(std::filesystem::path const& repo_path) noexcept
-> std::optional<GitRepo> {
#ifdef BOOTSTRAP_BUILD_TOOL
return std::nullopt;
#else
auto repo = GitRepo(repo_path);
if (repo.repo_ == nullptr) {
return std::nullopt;
}
return repo;
#endif // BOOTSTRAP_BUILD_TOOL
}
GitRepo::GitRepo(GitCASPtr git_cas) noexcept {
#ifndef BOOTSTRAP_BUILD_TOOL
if (git_cas != nullptr) {
if (git_repository_wrap_odb(&repo_, git_cas->odb_) != 0) {
Logger::Log(LogLevel::Error,
"could not create wrapper for git repository");
git_repository_free(repo_);
repo_ = nullptr;
return;
}
is_repo_fake_ = true;
git_cas_ = std::move(git_cas);
}
else {
Logger::Log(LogLevel::Error,
"git repository creation attempted with null odb!");
}
#endif // BOOTSTRAP_BUILD_TOOL
}
GitRepo::GitRepo(std::filesystem::path const& repo_path) noexcept {
#ifndef BOOTSTRAP_BUILD_TOOL
try {
static std::mutex repo_mutex{};
std::unique_lock lock{repo_mutex};
auto cas = std::make_shared<GitCAS>();
// open repo, but retain it
if (git_repository_open(&repo_, repo_path.c_str()) != 0) {
Logger::Log(LogLevel::Error,
"opening git repository {} failed with:\n{}",
repo_path.string(),
GitLastError());
git_repository_free(repo_);
repo_ = nullptr;
return;
}
// get odb
git_repository_odb(&cas->odb_, repo_);
if (cas->odb_ == nullptr) {
Logger::Log(LogLevel::Error,
"retrieving odb of git repository {} failed with:\n{}",
repo_path.string(),
GitLastError());
git_repository_free(repo_);
repo_ = nullptr;
return;
}
is_repo_fake_ = false;
// save root path
cas->git_path_ = ToNormalPath(std::filesystem::absolute(
std::filesystem::path(git_repository_path(repo_))));
// retain the pointer
git_cas_ = std::static_pointer_cast<GitCAS const>(cas);
} catch (std::exception const& ex) {
Logger::Log(LogLevel::Error,
"opening git object database failed with:\n{}",
ex.what());
repo_ = nullptr;
}
#endif // BOOTSTRAP_BUILD_TOOL
}
GitRepo::GitRepo(GitRepo&& other) noexcept
: git_cas_{std::move(other.git_cas_)},
repo_{other.repo_},
is_repo_fake_{other.is_repo_fake_} {
other.repo_ = nullptr;
}
auto GitRepo::operator=(GitRepo&& other) noexcept -> GitRepo& {
git_cas_ = std::move(other.git_cas_);
repo_ = other.repo_;
is_repo_fake_ = other.is_repo_fake_;
other.git_cas_ = nullptr;
return *this;
}
auto GitRepo::InitAndOpen(std::filesystem::path const& repo_path,
bool is_bare) noexcept -> std::optional<GitRepo> {
#ifndef BOOTSTRAP_BUILD_TOOL
try {
static std::mutex repo_mutex{};
std::unique_lock lock{repo_mutex};
auto git_state = GitContext(); // initialize libgit2
git_repository* tmp_repo{nullptr};
size_t max_attempts = 3; // number of tries
int err = 0;
while (max_attempts > 0) {
--max_attempts;
err = git_repository_init(
&tmp_repo, repo_path.c_str(), static_cast<size_t>(is_bare));
if (err == 0) {
git_repository_free(tmp_repo);
return GitRepo(repo_path); // success
}
git_repository_free(tmp_repo); // cleanup before next attempt
// check if init hasn't already happened in another process
if (git_repository_open_ext(nullptr,
repo_path.c_str(),
GIT_REPOSITORY_OPEN_NO_SEARCH,
nullptr) == 0) {
return GitRepo(repo_path); // success
}
// repo still not created, so sleep and try again
std::this_thread::sleep_for(std::chrono::milliseconds(kWaitTime));
}
Logger::Log(
LogLevel::Error,
"initializing git repository {} failed with error code:\n{}",
(repo_path / "").string(),
err);
} catch (std::exception const& ex) {
Logger::Log(LogLevel::Error,
"initializing git repository {} failed with:\n{}",
(repo_path / "").string(),
ex.what());
}
#endif // BOOTSTRAP_BUILD_TOOL
return std::nullopt;
}
auto GitRepo::GetGitCAS() const noexcept -> GitCASPtr {
return git_cas_;
}
GitRepo::~GitRepo() noexcept {
// release resources
git_repository_free(repo_);
}
auto GitRepo::IsRepoFake() const noexcept -> bool {
return is_repo_fake_;
}
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