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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 <algorithm>
#include <sstream>
#include <vector>
#include "src/buildtool/common/artifact_digest.hpp"
#include "src/buildtool/logging/log_level.hpp"
#include "src/buildtool/logging/logger.hpp"
#include "src/utils/cpp/path.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,
bool ignore_special = false) noexcept -> GitTreeEntryPtr {
auto segment = *it;
auto entry = tree.LookupEntryByName(segment);
if (not entry) {
return nullptr;
}
if (++it != end) {
auto const& subtree = entry->Tree(ignore_special);
if (not subtree) {
return nullptr;
}
return LookupEntryPyPath(*subtree, it, end);
}
return entry;
}
class SymlinksChecker final {
public:
explicit SymlinksChecker(gsl::not_null<GitCASPtr> const& cas) noexcept
: cas_{*cas} {}
[[nodiscard]] auto operator()(
std::vector<ArtifactDigest> const& ids) const noexcept -> bool {
return std::all_of(
ids.begin(), ids.end(), [&cas = cas_](ArtifactDigest const& id) {
auto content = cas.ReadObject(id.hash(), /*is_hex_id=*/true);
return content.has_value() and PathIsNonUpwards(*content);
});
};
private:
GitCAS const& cas_;
};
} // 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,
bool ignore_special) noexcept -> std::optional<GitTree> {
if (auto raw_id = FromHexString(tree_id)) {
auto repo = GitRepo::Open(cas);
if (repo != std::nullopt) {
if (auto entries = repo->ReadTree(*raw_id,
SymlinksChecker{cas},
/*is_hex_id=*/false,
ignore_special)) {
// NOTE: the raw_id value is NOT recomputed when
// ignore_special==true.
return GitTree::FromEntries(
cas, std::move(*entries), *raw_id, ignore_special);
}
}
else {
return ::std::nullopt;
}
}
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::Debug, "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(), ignore_special_);
}
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(bool ignore_special) const& noexcept
-> std::optional<GitTree> const& {
return tree_cached_.SetOnceAndGet(
[this, ignore_special]() -> std::optional<GitTree> {
if (IsTree()) {
auto repo = GitRepo::Open(cas_);
if (repo == std::nullopt) {
return std::nullopt;
}
if (auto entries = repo->ReadTree(raw_id_,
SymlinksChecker{cas_},
/*is_hex_id=*/false,
ignore_special)) {
return GitTree::FromEntries(
cas_, std::move(*entries), raw_id_, ignore_special);
}
}
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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