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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_cas.hpp"
#include <exception>
#include <mutex>
#include "src/buildtool/file_system/git_context.hpp"
#include "src/buildtool/logging/logger.hpp"
#include "src/utils/cpp/hex_string.hpp"
#include "src/utils/cpp/path.hpp"
#ifndef BOOTSTRAP_BUILD_TOOL
extern "C" {
#include <git2.h>
}
namespace {
[[nodiscard]] auto GitTypeToObjectType(git_object_t const& type) noexcept
-> std::optional<ObjectType> {
switch (type) {
case GIT_OBJECT_BLOB:
return ObjectType::File;
case GIT_OBJECT_TREE:
return ObjectType::Tree;
default:
Logger::Log(LogLevel::Debug,
"Unsupported git object type {}",
git_object_type2string(type));
return std::nullopt;
}
}
} // namespace
#endif // BOOTSTRAP_BUILD_TOOL
GitCAS::GitCAS() noexcept {
GitContext::Create();
}
auto GitCAS::Open(std::filesystem::path const& repo_path,
LogLevel log_failure) noexcept -> GitCASPtr {
#ifdef BOOTSTRAP_BUILD_TOOL
return nullptr;
#else
try {
auto result = std::make_shared<GitCAS>();
// lock as git_repository API has no thread-safety guarantees
static std::mutex repo_mutex{};
std::unique_lock lock{repo_mutex};
git_repository* repo_ptr = nullptr;
if (git_repository_open_ext(&repo_ptr,
repo_path.c_str(),
GIT_REPOSITORY_OPEN_NO_SEARCH,
nullptr) != 0 or
repo_ptr == nullptr) {
Logger::Log(log_failure,
"Opening git repository {} failed with:\n{}",
repo_path.string(),
GitLastError());
return nullptr;
}
result->repo_.reset(repo_ptr);
git_odb* odb_ptr = nullptr;
if (git_repository_odb(&odb_ptr, result->repo_.get()) != 0 or
odb_ptr == nullptr) {
Logger::Log(log_failure,
"Obtaining git object database {} failed with:\n{}",
repo_path.string(),
GitLastError());
return nullptr;
}
result->odb_.reset(odb_ptr);
auto const git_path =
git_repository_is_bare(result->repo_.get()) != 0
? ToNormalPath(git_repository_path(result->repo_.get()))
: ToNormalPath(git_repository_workdir(result->repo_.get()));
result->git_path_ = std::filesystem::absolute(git_path);
return std::const_pointer_cast<GitCAS const>(result);
} catch (std::exception const& e) {
Logger::Log(log_failure,
"Unexpected failure opening git object database {}:\n{}",
repo_path.string(),
e.what());
return nullptr;
}
#endif
}
auto GitCAS::CreateEmpty() noexcept -> GitCASPtr {
#ifdef BOOTSTRAP_BUILD_TOOL
return nullptr;
#else
try {
auto result = std::make_shared<GitCAS>();
git_odb* odb_ptr{nullptr};
if (git_odb_new(&odb_ptr) != 0 or odb_ptr == nullptr) {
Logger::Log(LogLevel::Error,
"Creating an empty database failed with:\n{}",
GitLastError());
return nullptr;
}
result->odb_.reset(odb_ptr); // retain odb pointer
git_repository* repo_ptr = nullptr;
if (git_repository_wrap_odb(&repo_ptr, result->odb_.get()) != 0 or
repo_ptr == nullptr) {
Logger::Log(LogLevel::Error,
"Creating an empty repository failed with:\n{}",
GitLastError());
return nullptr;
}
result->repo_.reset(repo_ptr); // retain repo pointer
return std::const_pointer_cast<GitCAS const>(result);
} catch (std::exception const& e) {
Logger::Log(LogLevel::Error,
"Unexpected failure creating empty repository:\n{}",
e.what());
return nullptr;
}
#endif
}
auto GitCAS::ReadObject(std::string const& id,
bool is_hex_id,
bool as_valid_symlink,
LogLevel log_failure) const noexcept
-> std::optional<std::string> {
#ifdef BOOTSTRAP_BUILD_TOOL
return std::nullopt;
#else
try {
if (not odb_) {
return std::nullopt;
}
auto oid = GitObjectID(id, is_hex_id);
if (not oid) {
return std::nullopt;
}
git_odb_object* obj = nullptr;
if (git_odb_read(&obj, odb_.get(), &oid.value()) != 0) {
Logger::Log(log_failure,
"Reading git object {} from database failed with:\n{}",
is_hex_id ? id : ToHexString(id),
GitLastError());
return std::nullopt;
}
std::string data(static_cast<char const*>(git_odb_object_data(obj)),
git_odb_object_size(obj));
auto obj_type = GitTypeToObjectType(git_odb_object_type(obj));
git_odb_object_free(obj);
if (as_valid_symlink) {
if (not obj_type) {
return std::nullopt;
}
if (not IsTreeObject(*obj_type) and not PathIsNonUpwards(data)) {
Logger::Log(log_failure,
"Invalid git object {}: upwards symlink",
is_hex_id ? id : ToHexString(id));
return std::nullopt;
}
}
return data;
} catch (std::exception const& e) {
Logger::Log(log_failure,
"Unexpected failure reading git object {}:\n{}",
is_hex_id ? id : ToHexString(id),
e.what());
return std::nullopt;
}
#endif
}
auto GitCAS::ReadHeader(std::string const& id, bool is_hex_id) const noexcept
-> std::optional<std::pair<std::size_t, ObjectType>> {
#ifndef BOOTSTRAP_BUILD_TOOL
try {
if (not odb_) {
return std::nullopt;
}
auto oid = GitObjectID(id, is_hex_id);
if (not oid) {
return std::nullopt;
}
std::size_t size{};
git_object_t type{};
if (git_odb_read_header(&size, &type, odb_.get(), &oid.value()) != 0) {
Logger::Log(LogLevel::Debug,
"Reading git object header {} from database failed "
"with:\n{}",
is_hex_id ? id : ToHexString(id),
GitLastError());
return std::nullopt;
}
if (auto obj_type = GitTypeToObjectType(type)) {
return std::make_pair(size, *obj_type);
}
} catch (std::exception const& e) {
Logger::Log(LogLevel::Debug,
"Unexpected failure reading git object header {}:\n{}",
is_hex_id ? id : ToHexString(id),
e.what());
}
#endif
return std::nullopt;
}
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