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#include "src/buildtool/file_system/git_cas.hpp"
#include <mutex>
#include <sstream>
#include "src/buildtool/file_system/file_system_manager.hpp"
#include "src/buildtool/logging/logger.hpp"
#include "src/utils/cpp/hex_string.hpp"
extern "C" {
#include <git2.h>
}
namespace {
constexpr auto kOIDRawSize{GIT_OID_RAWSZ};
constexpr auto kOIDHexSize{GIT_OID_HEXSZ};
[[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>";
}
[[nodiscard]] auto GitObjectID(std::string const& id,
bool is_hex_id = false) noexcept
-> std::optional<git_oid> {
if ((is_hex_id and id.size() < kOIDHexSize) or id.size() < kOIDRawSize) {
Logger::Log(LogLevel::Error,
"invalid git object id {}",
is_hex_id ? id : ToHexString(id));
return std::nullopt;
}
git_oid oid{};
if (is_hex_id and git_oid_fromstr(&oid, id.data()) == 0) {
return oid;
}
if (not is_hex_id and
git_oid_fromraw(
&oid,
reinterpret_cast<unsigned char const*>(id.data()) // NOLINT
) == 0) {
return oid;
}
Logger::Log(LogLevel::Error,
"parsing git object id {} failed with:\n{}",
is_hex_id ? id : ToHexString(id),
GitLastError());
return std::nullopt;
}
[[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::Error,
"unsupported git object type {}",
git_object_type2string(type));
return std::nullopt;
}
}
} // namespace
auto GitCAS::Open(std::filesystem::path const& repo_path) noexcept
-> GitCASPtr {
try {
auto cas = std::make_shared<GitCAS>();
if (cas->OpenODB(repo_path)) {
return 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());
}
return nullptr;
}
GitCAS::GitCAS() noexcept {
if (not(initialized_ = (git_libgit2_init() >= 0))) {
Logger::Log(LogLevel::Error, "initializing libgit2 failed");
}
}
GitCAS::~GitCAS() noexcept {
if (odb_ != nullptr) {
git_odb_free(odb_);
odb_ = nullptr;
}
if (initialized_) {
git_libgit2_shutdown();
}
}
auto GitCAS::ReadObject(std::string const& id, bool is_hex_id) const noexcept
-> std::optional<std::string> {
if (not initialized_) {
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_, &oid.value()) != 0) {
Logger::Log(LogLevel::Error,
"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));
git_odb_object_free(obj);
return data;
}
auto GitCAS::ReadHeader(std::string const& id, bool is_hex_id) const noexcept
-> std::optional<std::pair<std::size_t, ObjectType>> {
if (not initialized_) {
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_, &oid.value()) != 0) {
Logger::Log(LogLevel::Error,
"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);
}
return std::nullopt;
}
auto GitCAS::OpenODB(std::filesystem::path const& repo_path) noexcept -> bool {
static std::mutex repo_mutex{};
if (initialized_) {
{ // lock as git_repository API has no thread-safety guarantees
std::unique_lock lock{repo_mutex};
git_repository* repo = nullptr;
if (git_repository_open(&repo, repo_path.c_str()) != 0) {
Logger::Log(LogLevel::Error,
"opening git repository {} failed with:\n{}",
repo_path.string(),
GitLastError());
return false;
}
git_repository_odb(&odb_, repo);
git_repository_free(repo);
}
if (odb_ == nullptr) {
Logger::Log(LogLevel::Error,
"obtaining git object database {} failed with:\n{}",
repo_path.string(),
GitLastError());
return false;
}
}
return initialized_;
}
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