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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_tree.hpp"
#include <sstream>
#include "src/buildtool/logging/logger.hpp"
#include "src/utils/cpp/hex_string.hpp"
extern "C" {
#include <git2.h>
}
namespace {
// resolve '.' and '..' in path.
[[nodiscard]] auto ResolveRelativePath(
std::filesystem::path const& path) noexcept -> std::filesystem::path {
auto normalized = path.lexically_normal();
return (normalized / "").parent_path(); // strip trailing slash
}
// NOLINTNEXTLINE(misc-no-recursion)
[[nodiscard]] auto LookupEntryPyPath(
GitTree const& tree,
std::filesystem::path::const_iterator it,
std::filesystem::path::const_iterator const& end) noexcept
-> GitTreeEntryPtr {
auto segment = *it;
auto entry = tree.LookupEntryByName(segment);
if (not entry) {
return nullptr;
}
if (++it != end) {
if (not entry->IsTree()) {
return nullptr;
}
return LookupEntryPyPath(*entry->Tree(), it, end);
}
return entry;
}
} // namespace
auto GitTree::Read(std::filesystem::path const& repo_path,
std::string const& tree_id) noexcept
-> std::optional<GitTree> {
auto cas = GitCAS::Open(repo_path);
if (not cas) {
return std::nullopt;
}
return Read(cas, tree_id);
}
auto GitTree::Read(gsl::not_null<GitCASPtr> const& cas,
std::string const& tree_id) noexcept
-> std::optional<GitTree> {
if (auto raw_id = FromHexString(tree_id)) {
if (auto entries = cas->ReadTree(*raw_id)) {
return GitTree::FromEntries(cas, std::move(*entries), *raw_id);
}
}
return std::nullopt;
}
auto GitTree::LookupEntryByName(std::string const& name) const noexcept
-> GitTreeEntryPtr {
auto entry_it = entries_.find(name);
if (entry_it == entries_.end()) {
Logger::Log(
LogLevel::Error, "git tree does not contain entry {}", name);
return nullptr;
}
return entry_it->second;
}
auto GitTree::LookupEntryByPath(
std::filesystem::path const& path) const noexcept -> GitTreeEntryPtr {
auto resolved = ResolveRelativePath(path);
return LookupEntryPyPath(*this, resolved.begin(), resolved.end());
}
auto GitTree::Size() const noexcept -> std::optional<std::size_t> {
if (auto header = cas_->ReadHeader(raw_id_)) {
return header->first;
}
return std::nullopt;
}
auto GitTree::RawData() const noexcept -> std::optional<std::string> {
return cas_->ReadObject(raw_id_);
}
auto GitTreeEntry::Blob() const noexcept -> std::optional<std::string> {
if (not IsBlob()) {
return std::nullopt;
}
return cas_->ReadObject(raw_id_);
}
auto GitTreeEntry::Tree() const& noexcept -> std::optional<GitTree> const& {
return tree_cached_.SetOnceAndGet([this]() -> std::optional<GitTree> {
if (IsTree()) {
if (auto entries = cas_->ReadTree(raw_id_)) {
return GitTree::FromEntries(cas_, std::move(*entries), raw_id_);
}
}
return std::nullopt;
});
}
auto GitTreeEntry::Size() const noexcept -> std::optional<std::size_t> {
if (auto header = cas_->ReadHeader(raw_id_)) {
return header->first;
}
return std::nullopt;
}
auto GitTreeEntry::RawData() const noexcept -> std::optional<std::string> {
return cas_->ReadObject(raw_id_);
}
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