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// Copyright 2024 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/tree_structure/tree_structure_utils.hpp"
#include <algorithm>
#include <cstddef>
#include <filesystem>
#include <functional>
#include <memory>
#include <optional>
#include <unordered_map>
#include <utility>
#include <vector>
#include "fmt/core.h"
#include "src/buildtool/common/artifact.hpp"
#include "src/buildtool/common/artifact_digest_factory.hpp"
#include "src/buildtool/common/protocol_traits.hpp"
#include "src/buildtool/common/repository_config.hpp"
#include "src/buildtool/crypto/hash_function.hpp"
#include "src/buildtool/execution_api/git/git_api.hpp"
#include "src/buildtool/file_system/file_system_manager.hpp"
#include "src/buildtool/file_system/git_repo.hpp"
#include "src/buildtool/file_system/object_type.hpp"
#include "src/utils/cpp/hex_string.hpp"
#include "src/utils/cpp/path.hpp"
#include "src/utils/cpp/tmp_dir.hpp"
auto TreeStructureUtils::Compute(ArtifactDigest const& tree,
Storage const& storage,
TreeStructureCache const& cache) noexcept
-> expected<ArtifactDigest, std::string> {
if (not tree.IsTree() or not ProtocolTraits::IsNative(tree.GetHashType())) {
return unexpected{fmt::format("Not a git tree: {}", tree.hash())};
}
if (auto result = cache.Get(tree)) {
return *std::move(result);
}
auto const tree_path = storage.CAS().TreePath(tree);
if (not tree_path) {
return unexpected{
fmt::format("Failed to read from the storage: {}", tree.hash())};
}
auto const tree_content = FileSystemManager::ReadFile(*tree_path);
if (not tree_content) {
return unexpected{
fmt::format("Failed to read content of: {}", tree.hash())};
}
auto const check_symlinks =
[&storage](std::vector<ArtifactDigest> const& ids) {
return std::all_of(
ids.begin(), ids.end(), [&storage](auto const& id) -> bool {
auto path_to_symlink =
storage.CAS().BlobPath(id, /*is_executable=*/false);
if (not path_to_symlink) {
return false;
}
auto const content =
FileSystemManager::ReadFile(*path_to_symlink);
return content and PathIsNonUpwards(*content);
});
};
auto const entries = GitRepo::ReadTreeData(
*tree_content, tree.hash(), check_symlinks, /*is_hex_id=*/true);
if (not entries) {
return unexpected{
fmt::format("Failed to parse git tree: {}", tree.hash())};
}
GitRepo::tree_entries_t structure_entries{};
for (auto const& [raw_id, es] : *entries) {
for (auto const& entry : es) {
std::optional<ArtifactDigest> structure_digest;
if (IsTreeObject(entry.type)) {
auto const git_digest =
ArtifactDigestFactory::Create(HashFunction::Type::GitSHA1,
ToHexString(raw_id),
/*size is unknown*/ 0,
/*is_tree=*/true);
if (not git_digest) {
return unexpected{git_digest.error()};
}
auto sub_tree = Compute(*git_digest, storage, cache);
if (not sub_tree) {
return sub_tree;
}
structure_digest = *std::move(sub_tree);
}
else {
structure_digest = storage.CAS().StoreBlob(
std::string{}, IsExecutableObject(entry.type));
}
if (not structure_digest) {
return unexpected{fmt::format(
"Failed to get structure digest for: {}", raw_id)};
}
if (auto id = FromHexString(structure_digest->hash())) {
structure_entries[*std::move(id)].emplace_back(entry);
}
else {
return unexpected{
fmt::format("Failed to get raw id for {}", raw_id)};
}
}
}
auto const structure_tree = GitRepo::CreateShallowTree(structure_entries);
if (not structure_tree) {
return unexpected{fmt::format(
"Failed to create structured Git tree for {}", tree.hash())};
}
auto tree_structure = storage.CAS().StoreTree(structure_tree->second);
if (not tree_structure) {
return unexpected{fmt::format(
"Failed to add tree structure to the CAS for {}", tree.hash())};
}
if (not cache.Set(tree, *tree_structure)) {
return unexpected{fmt::format(
"Failed to create a tree structure cache entry for\n{} => {}",
tree.hash(),
tree_structure->hash())};
}
return *std::move(tree_structure);
}
auto TreeStructureUtils::ImportToGit(
ArtifactDigest const& tree,
IExecutionApi const& source_api,
StorageConfig const& target_config,
gsl::not_null<std::mutex*> const& tagging_lock) noexcept
-> expected<ArtifactDigest, std::string> {
if (not tree.IsTree() or not ProtocolTraits::IsNative(tree.GetHashType())) {
return unexpected{fmt::format("Not a git tree: {}", tree.hash())};
}
// Check the source contains the tree:
if (not source_api.IsAvailable(tree)) {
return unexpected{
fmt::format("Source doesn't contain tree {}", tree.hash())};
}
// Check the tree is in the repository already:
if (auto in_repo =
GitRepo::IsTreeInRepo(target_config.GitRoot(), tree.hash())) {
if (*in_repo) {
return tree;
}
}
else {
return unexpected{std::move(in_repo).error()};
}
auto const tmp_dir =
target_config.CreateTypedTmpDir("import_from_cas_to_git");
if (tmp_dir == nullptr) {
return unexpected{fmt::format(
"Failed to create temporary directory for {}", tree.hash())};
}
// Stage the tree to a temporary directory:
if (not source_api.RetrieveToPaths(
{Artifact::ObjectInfo{tree, ObjectType::Tree}},
{tmp_dir->GetPath()})) {
return unexpected{fmt::format(
"Failed to stage {} to a temporary location.", tree.hash())};
}
// Import the result to git:
auto tree_hash = GitRepo::ImportToGit(
target_config,
tmp_dir->GetPath(),
/*commit_message=*/fmt::format("Import {}", tree.hash()),
tagging_lock);
if (not tree_hash) {
return unexpected{std::move(tree_hash).error()};
}
auto digest = ArtifactDigestFactory::Create(HashFunction::Type::GitSHA1,
tree_hash.value(),
/*size_unknown=*/0,
/*is_tree=*/true);
if (not digest) {
return unexpected{std::move(digest).error()};
}
return *digest;
}
auto TreeStructureUtils::ExportFromGit(
ArtifactDigest const& tree,
std::vector<std::filesystem::path> const& source_repos,
IExecutionApi const& target_api) noexcept -> expected<bool, std::string> {
if (not tree.IsTree() or not ProtocolTraits::IsNative(tree.GetHashType())) {
return unexpected{fmt::format("Not a git tree: {}", tree.hash())};
}
// Find git repo that contains the tree:
std::filesystem::path const* repo = nullptr;
for (std::size_t i = 0; i < source_repos.size() and repo == nullptr; ++i) {
auto in_repo = GitRepo::IsTreeInRepo(source_repos[i], tree.hash());
if (not in_repo.has_value()) {
return unexpected{std::move(in_repo).error()};
}
if (*in_repo) {
repo = &source_repos[i];
}
}
// Check that at least one repo contains the tree:
if (repo == nullptr) {
return false;
}
RepositoryConfig repo_config{};
if (not repo_config.SetGitCAS(*repo)) {
return unexpected{
fmt::format("Failed to set git cas at {}", repo->string())};
}
auto const git_api = GitApi{&repo_config};
return git_api.RetrieveToCas({Artifact::ObjectInfo{tree, ObjectType::Tree}},
target_api);
}
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