path: root/src/zenremotestore/builds/buildsavedstate.cpp

// Copyright Epic Games, Inc. All Rights Reserved.

#include <zenremotestore/builds/buildsavedstate.h>

#include <zencore/basicfile.h>
#include <zencore/compactbinaryutil.h>
#include <zencore/compactbinaryvalidation.h>
#include <zencore/filesystem.h>
#include <zencore/fmtutils.h>
#include <zencore/trace.h>

ZEN_THIRD_PARTY_INCLUDES_START
#include <tsl/robin_set.h>
ZEN_THIRD_PARTY_INCLUDES_END

#if ZEN_WITH_TESTS
#	include <zencore/testing.h>
#	include <zencore/testutils.h>
#endif	// ZEN_WITH_TESTS

namespace zen {

using namespace std::literals;

namespace {
	std::filesystem::path ZenStateDownloadFolder(const std::filesystem::path& SystemRootDir)
	{
		return SystemRootDir / "builds" / "downloads";
	}
}  // namespace

///////////////////////// BuildsSelection

void
BuildsSelection::Write(const BuildsSelection& Selection, CbWriter& Output)
{
	Output.BeginArray("builds"sv);
	for (const BuildsSelection::Build& Build : Selection.Builds)
	{
		Output.BeginObject();
		{
			ZEN_ASSERT(Build.Id != Oid::Zero);
			Output.AddObjectId("buildId"sv, Build.Id);
			compactbinary_helpers::WriteArray(Build.IncludeWildcards, "includeWildcards"sv, Output);
			compactbinary_helpers::WriteArray(Build.ExcludeWildcards, "excludeWildcards"sv, Output);

			Output.BeginArray("parts"sv);
			for (const BuildsSelection::BuildPart& BuildPart : Build.Parts)
			{
				Output.BeginObject();
				{
					ZEN_ASSERT(BuildPart.Id != Oid::Zero);
					Output.AddObjectId("partId"sv, BuildPart.Id);
					Output.AddString("partName"sv, BuildPart.Name);
				}
				Output.EndObject();
			}
			Output.EndArray();	// parts
		}
		Output.EndObject();
	}
	Output.EndArray();	// builds
}

BuildsSelection
BuildsSelection::Read(CbObjectView& Input, std::vector<ChunkedFolderContent>* OptionalOutLegacyPartsContent)
{
	std::vector<BuildsSelection::Build> Builds;

	CbArrayView BuildsArray = Input["builds"sv].AsArrayView();
	Builds.reserve(BuildsArray.Num());
	for (CbFieldView BuildView : BuildsArray)
	{
		std::vector<BuildsSelection::BuildPart> Parts;
		CbObjectView							BuildObjectView = BuildView.AsObjectView();
		Oid										BuildId			= BuildObjectView["buildId"sv].AsObjectId();
		if (BuildId == Oid::Zero)
		{
			throw std::runtime_error(fmt::format("BuildsSelection build id is invalid '{}'", BuildId));
		}

		std::vector<std::string> IncludeWildcards = compactbinary_helpers::ReadArray<std::string>("includeWildcards"sv, BuildObjectView);
		std::vector<std::string> ExcludeWildcards = compactbinary_helpers::ReadArray<std::string>("excludeWildcards"sv, BuildObjectView);

		CbArrayView BuildPartsArray = BuildObjectView["parts"sv].AsArrayView();
		Parts.reserve(BuildPartsArray.Num());
		for (CbFieldView PartView : BuildPartsArray)
		{
			CbObjectView PartObjectView = PartView.AsObjectView();
			Oid			 BuildPartId	= PartObjectView["partId"sv].AsObjectId();
			if (BuildPartId == Oid::Zero)
			{
				throw std::runtime_error(fmt::format("BuildsSelection build part id in build '{}' is invalid '{}'", BuildId, BuildPartId));
			}
			std::string_view BuildPartName = PartObjectView["partName"sv].AsString();

			if (OptionalOutLegacyPartsContent != nullptr)
			{
				CbObjectView PartContentObjectView = PartObjectView["content"sv].AsObjectView();
				if (PartContentObjectView)
				{
					OptionalOutLegacyPartsContent->push_back(LoadChunkedFolderContentFromCompactBinary(PartContentObjectView));
				}
			}
			Parts.push_back(BuildsSelection::BuildPart{.Id = BuildPartId, .Name = std::string(BuildPartName)});
		}

		Builds.push_back(BuildsSelection::Build{.Id				  = BuildId,
												.Parts			  = std::move(Parts),
												.IncludeWildcards = std::move(IncludeWildcards),
												.ExcludeWildcards = std::move(ExcludeWildcards)});
	}
	return BuildsSelection{.Builds = std::move(Builds)};
}

///////////////////////// BuildState

void
BuildState::Write(const BuildState& State, CbWriter& Output)
{
	BuildsSelection::Write(State.Selection, Output);

	Output.BeginObject("content");
	{
		SaveChunkedFolderContentToCompactBinary(State.ChunkedContent, Output);
	}
	Output.EndObject();	 // content
}

BuildState
BuildState::Read(CbObjectView& Input)
{
	std::vector<ChunkedFolderContent> LegacyPartsContent;
	BuildsSelection					  Selection = BuildsSelection::Read(Input, &LegacyPartsContent);

	ChunkedFolderContent ChunkedContent;
	CbObjectView		 ContentObjectView = Input["content"sv].AsObjectView();
	if (ContentObjectView)
	{
		ZEN_ASSERT(LegacyPartsContent.empty());
		ChunkedContent = LoadChunkedFolderContentFromCompactBinary(ContentObjectView);
	}
	else
	{
		if (LegacyPartsContent.size() == 1)
		{
			ChunkedContent = std::move(LegacyPartsContent.front());
		}
		else
		{
			ChunkedContent =
				MergeChunkedFolderContents(LegacyPartsContent[0], std::span<const ChunkedFolderContent>(LegacyPartsContent).subspan(1));
		}
	}

	return BuildState{.Selection = std::move(Selection), .ChunkedContent = std::move(ChunkedContent)};
}

///////////////////////// BuildSaveState

void
BuildSaveState::Write(const BuildSaveState& SaveState, CbWriter& Output)
{
	ZEN_ASSERT(!SaveState.LocalPath.empty());

	Output.AddString("path", (const char*)SaveState.LocalPath.u8string().c_str());
	BuildsSelection::Write(SaveState.State.Selection, Output);

	Output.BeginObject("content");
	{
		SaveChunkedFolderContentToCompactBinary(SaveState.State.ChunkedContent, Output);
	}
	Output.EndObject();	 // content

	Output.BeginObject("localFolderState"sv);
	{
		SaveFolderContentToCompactBinary(SaveState.FolderState, Output);
	}
	Output.EndObject();	 // localFolderState
}

BuildSaveState
BuildSaveState::Read(CbObjectView& Input)
{
	BuildState			  State					 = BuildState::Read(Input);
	CbObjectView		  LocalFolderStateObject = Input["localFolderState"sv].AsObjectView();
	FolderContent		  FolderState			 = LoadFolderContentToCompactBinary(LocalFolderStateObject);
	std::filesystem::path LocalPath				 = Input["path"sv].AsU8String();
	if (LocalPath.empty())
	{
		throw std::runtime_error("BuildSaveState is invalid, 'path' field is empty");
	}

	return BuildSaveState{.State = std::move(State), .FolderState = std::move(FolderState), .LocalPath = std::move(LocalPath)};
}

CbObject
CreateBuildSaveStateObject(const BuildSaveState& SaveState)
{
	CbObjectWriter CurrentStateWriter;
	BuildSaveState::Write(SaveState, CurrentStateWriter);
	return CurrentStateWriter.Save();
}

BuildSaveState
ReadBuildSaveStateFile(const std::filesystem::path& StateFilePath)
{
	ZEN_TRACE_CPU("ReadStateFile");

	IoBuffer DataBuffer;
	{
		BasicFile Source(StateFilePath, BasicFile::Mode::kRead);
		DataBuffer = Source.ReadAll();
	}

	CbValidateError ValidateError;
	if (CbObject CurrentStateObject = ValidateAndReadCompactBinaryObject(std::move(DataBuffer), ValidateError);
		ValidateError == CbValidateError::None)
	{
		if (CurrentStateObject)
		{
			return BuildSaveState::Read(CurrentStateObject);
		}
		else
		{
			throw std::runtime_error(fmt::format("Compact binary object read from '{}' is empty", StateFilePath));
		}
	}
	else
	{
		throw std::runtime_error(
			fmt::format("Failed to read compact binary object from '{}', reason: {}", StateFilePath, ToString(ValidateError)));
	}
}

///////////////////////// BuildsDownloadInfo

void
BuildsDownloadInfo::Write(const BuildsDownloadInfo& Info, CbWriter& Output)
{
	ZEN_ASSERT(!Info.LocalPath.empty());
	ZEN_ASSERT(!Info.StateFilePath.empty());
	ZEN_ASSERT(!Info.Iso8601Date.empty());

	Output.AddString("path", (const char*)Info.LocalPath.u8string().c_str());
	Output.AddString("statePath", (const char*)Info.StateFilePath.u8string().c_str());
	Output.AddString("date", Info.Iso8601Date);

	BuildsSelection::Write(Info.Selection, Output);
}

BuildsDownloadInfo
BuildsDownloadInfo::Read(CbObjectView& Input)
{
	BuildsSelection Selection = BuildsSelection::Read(Input, /*OptionalOutLegacyPartsContent*/ nullptr);

	std::filesystem::path LocalPath = Input["path"sv].AsU8String();
	if (LocalPath.empty())
	{
		throw std::runtime_error("BuildsDownloadInfo is invalid, 'path' field is empty");
	}
	std::filesystem::path StateFilePath = Input["statePath"sv].AsU8String();
	if (StateFilePath.empty())
	{
		throw std::runtime_error("BuildsDownloadInfo is invalid, 'statePath' field is empty");
	}
	std::string_view Iso8601Date = Input["date"sv].AsString();

	return BuildsDownloadInfo{.Selection	 = std::move(Selection),
							  .LocalPath	 = std::move(LocalPath),
							  .StateFilePath = std::move(StateFilePath),
							  .Iso8601Date	 = std::string(Iso8601Date)};
}

void
AddDownloadedPath(const std::filesystem::path& SystemRootDir, const BuildsDownloadInfo& Info)
{
	ZEN_TRACE_CPU("AddDownloadedPath");

	ZEN_ASSERT(!SystemRootDir.empty());
	ZEN_ASSERT(!Info.StateFilePath.empty());
	ZEN_ASSERT(!Info.LocalPath.empty());
	const std::u8string			LocalPathString		= Info.LocalPath.generic_u8string();
	IoHash						PathHash			= IoHash::HashBuffer(LocalPathString.data(), LocalPathString.length());
	const std::filesystem::path StateDownloadFolder = ZenStateDownloadFolder(SystemRootDir);
	CreateDirectories(StateDownloadFolder);
	std::filesystem::path WritePath = StateDownloadFolder / (PathHash.ToHexString() + ".json");

	CbObjectWriter Writer;
	BuildsDownloadInfo::Write(Info, Writer);

	CbObject					 Payload = Writer.Save();
	ExtendableStringBuilder<512> SB;
	CompactBinaryToJson(Payload.GetView(), SB);
	MemoryView JsonPayload(SB.Data(), SB.Size());
	TemporaryFile::SafeWriteFile(WritePath, JsonPayload);
}

BuildsDownloadInfo
ReadDownloadedInfoFile(const std::filesystem::path& DownloadInfoPath)
{
	IoBuffer		 MetaDataJson = ReadFile(DownloadInfoPath).Flatten();
	std::string_view Json(reinterpret_cast<const char*>(MetaDataJson.GetData()), MetaDataJson.GetSize());
	std::string		 JsonError;
	CbObject		 DownloadInfo = LoadCompactBinaryFromJson(Json, JsonError).AsObject();
	if (!JsonError.empty())
	{
		throw std::runtime_error(fmt::format("Invalid download state file at {}. '{}'", DownloadInfoPath, JsonError));
	}

	return BuildsDownloadInfo::Read(DownloadInfo);
}

std::vector<std::filesystem::path>
GetDownloadedStatePaths(const std::filesystem::path& SystemRootDir)
{
	ZEN_ASSERT(!SystemRootDir.empty());

	ZEN_TRACE_CPU("GetDownloadedPaths");

	std::vector<std::filesystem::path> Result;

	const std::filesystem::path StateDownloadFolder = ZenStateDownloadFolder(SystemRootDir);
	if (IsDir(StateDownloadFolder))
	{
		DirectoryContent Content;
		GetDirectoryContent(ZenStateDownloadFolder(SystemRootDir), DirectoryContentFlags::IncludeFiles, Content);
		for (const std::filesystem::path& EntryPath : Content.Files)
		{
			IoHash EntryPathHash;
			if (IoHash::TryParse(EntryPath.stem().string(), EntryPathHash))
			{
				Result.push_back(EntryPath);
			}
		}
	}
	return Result;
}

#if ZEN_WITH_TESTS

void
buildsavedstate_forcelink()
{
}

namespace buildsavestate_test {
	bool Equal(const BuildsSelection& Lhs, const BuildsSelection& Rhs)
	{
		if (Lhs.Builds.size() != Rhs.Builds.size())
		{
			return false;
		}
		for (size_t BuildIndex = 0; BuildIndex < Lhs.Builds.size(); BuildIndex++)
		{
			const BuildsSelection::Build LhsBuild = Lhs.Builds[BuildIndex];
			const BuildsSelection::Build RhsBuild = Rhs.Builds[BuildIndex];
			if (LhsBuild.Id != RhsBuild.Id)
			{
				return false;
			}
			if (LhsBuild.Parts.size() != RhsBuild.Parts.size())
			{
				return false;
			}
			for (size_t PartIndex = 0; PartIndex < LhsBuild.Parts.size(); PartIndex++)
			{
				const BuildsSelection::BuildPart LhsPart = LhsBuild.Parts[PartIndex];
				const BuildsSelection::BuildPart RhsPart = RhsBuild.Parts[PartIndex];
				if (LhsPart.Id != RhsPart.Id)
				{
					return false;
				}
				if (LhsPart.Name != RhsPart.Name)
				{
					return false;
				}
			}
			if (LhsBuild.IncludeWildcards != RhsBuild.IncludeWildcards)
			{
				return false;
			}
			if (LhsBuild.ExcludeWildcards != RhsBuild.ExcludeWildcards)
			{
				return false;
			}
		}
		return true;
	}
	bool Equal(const ChunkedContentData& Lhs, const ChunkedContentData& Rhs)
	{
		if (Lhs.SequenceRawHashes != Rhs.SequenceRawHashes)
		{
			return false;
		}
		if (Lhs.ChunkCounts != Rhs.ChunkCounts)
		{
			return false;
		}
		if (Lhs.ChunkOrders != Rhs.ChunkOrders)
		{
			return false;
		}
		if (Lhs.ChunkHashes != Rhs.ChunkHashes)
		{
			return false;
		}
		if (Lhs.ChunkRawSizes != Rhs.ChunkRawSizes)
		{
			return false;
		}
		return true;
	}

	bool Equal(const ChunkedFolderContent& Lhs, const ChunkedFolderContent& Rhs)
	{
		if (Lhs.Platform != Rhs.Platform)
		{
			return false;
		}
		if (Lhs.Paths != Rhs.Paths)
		{
			return false;
		}
		if (Lhs.RawSizes != Rhs.RawSizes)
		{
			return false;
		}
		if (Lhs.Attributes != Rhs.Attributes)
		{
			return false;
		}
		if (Lhs.RawHashes != Rhs.RawHashes)
		{
			return false;
		}
		return Equal(Lhs.ChunkedContent, Rhs.ChunkedContent);
	}

	bool Equal(const BuildState& Lhs, const BuildState& Rhs)
	{
		if (!Equal(Lhs.Selection, Rhs.Selection))
		{
			return false;
		}
		if (!Equal(Lhs.ChunkedContent, Rhs.ChunkedContent))
		{
			return false;
		}
		return true;
	}

	bool Equal(const FolderContent& Lhs, const FolderContent& Rhs)
	{
		if (Lhs.Platform != Rhs.Platform)
		{
			return false;
		}
		if (Lhs.Paths != Rhs.Paths)
		{
			return false;
		}
		if (Lhs.RawSizes != Rhs.RawSizes)
		{
			return false;
		}
		if (Lhs.Attributes != Rhs.Attributes)
		{
			return false;
		}
		if (Lhs.ModificationTicks != Rhs.ModificationTicks)
		{
			return false;
		}
		return true;
	}

	bool Equal(const BuildSaveState& Lhs, const BuildSaveState& Rhs)
	{
		if (!Equal(Lhs.State, Rhs.State))
		{
			return false;
		}
		if (!Equal(Lhs.FolderState, Rhs.FolderState))
		{
			return false;
		}
		if (Lhs.LocalPath != Rhs.LocalPath)
		{
			return false;
		}
		return true;
	}

	bool Equal(const BuildsDownloadInfo& Lhs, const BuildsDownloadInfo& Rhs)
	{
		if (!Equal(Lhs.Selection, Rhs.Selection))
		{
			return false;
		}
		if (Lhs.LocalPath != Rhs.LocalPath)
		{
			return false;
		}
		if (Lhs.StateFilePath != Rhs.StateFilePath)
		{
			return false;
		}
		if (Lhs.Iso8601Date != Rhs.Iso8601Date)
		{
			return false;
		}
		return true;
	}

	BuildsSelection MakeBuildsSelectionA()
	{
		return BuildsSelection{
			.Builds = std::vector<BuildsSelection::Build>{
				BuildsSelection::Build{
					.Id	   = Oid::NewOid(),
					.Parts = std::vector<BuildsSelection::BuildPart>{BuildsSelection::BuildPart{.Id = Oid::NewOid(), .Name = "default"}}},
				BuildsSelection::Build{
					.Id = Oid::NewOid(),
					.Parts =
						std::vector<BuildsSelection::BuildPart>{BuildsSelection::BuildPart{.Id = Oid::NewOid(), .Name = "first_part"},
																BuildsSelection::BuildPart{.Id = Oid::NewOid(), .Name = "second_part"}},
					.IncludeWildcards = std::vector<std::string>{std::string{"*.exe"}, std::string{"*.dll"}},
					.ExcludeWildcards = std::vector<std::string>{std::string{"*.pdb"}}},
				BuildsSelection::Build{
					.Id	   = Oid::NewOid(),
					.Parts = std::vector<BuildsSelection::BuildPart>{BuildsSelection::BuildPart{.Id = Oid::NewOid(), .Name = "default"}},
					.IncludeWildcards = std::vector<std::string>{std::string{"*.ucas"}, std::string{"*.utok"}},
					.ExcludeWildcards = std::vector<std::string>{std::string{"*.pak"}}}}};
	}

	BuildsSelection MakeBuildsSelectionB()
	{
		return BuildsSelection{
			.Builds = std::vector<BuildsSelection::Build>{
				BuildsSelection::Build{
					.Id	   = Oid::NewOid(),
					.Parts = std::vector<BuildsSelection::BuildPart>{BuildsSelection::BuildPart{.Id = Oid::NewOid(), .Name = "default"}}},
				BuildsSelection::Build{
					.Id	   = Oid::NewOid(),
					.Parts = std::vector<BuildsSelection::BuildPart>{BuildsSelection::BuildPart{.Id = Oid::NewOid(), .Name = "default"}},
					.IncludeWildcards = std::vector<std::string>{std::string{"*.exe"}, std::string{"*.dll"}},
					.ExcludeWildcards = std::vector<std::string>{std::string{"*.pdb"}, std::string{"*.xSYM"}}}}};
	}

	BuildState MakeBuildStateA(FastRandom& Random)
	{
		BuildsSelection		  Selection = MakeBuildsSelectionA();
		std::vector<IoBuffer> Chunks;

		ChunkedFolderContent Content = chunkedcontent_testutils::CreateChunkedFolderContent(
			Random,
			std::vector<std::pair<const std::string, uint64_t>>{
				std::pair<std::string, uint64_t>{"file_1", 6u * 1024u},
				std::pair<std::string, uint64_t>{"file_2.exe", 0},
				std::pair<std::string, uint64_t>{"file_3.txt", 798},
				std::pair<std::string, uint64_t>{"dir_1/dir1_file_1.exe", 19u * 1024u},
				std::pair<std::string, uint64_t>{"dir_1/dir1_file_2.pdb", 7u * 1024u},
				std::pair<std::string, uint64_t>{"dir_1/dir1_file_3.txt", 93},
				std::pair<std::string, uint64_t>{"dir_2/dir2_dir1/dir2_dir1_file_1.exe", 31u * 1024u},
				std::pair<std::string, uint64_t>{"dir_2/dir2_dir1/dir2_dir1_file_2.pdb", 17u * 1024u},
				std::pair<std::string, uint64_t>{"dir_2/dir2_dir1/dir2_dir1_file_3.dll", 13u * 1024u},
				std::pair<std::string, uint64_t>{"dir_2/dir2_dir2/dir2_dir2_file_1.txt", 2u * 1024u},
				std::pair<std::string, uint64_t>{"dir_2/dir2_dir2/dir2_dir2_file_2.json", 3u * 1024u}},
			4u * 1024u,
			Chunks);
		return BuildState{.Selection = std::move(Selection), .ChunkedContent = std::move(Content)};
	}

	FolderContent MakeFolderContent(ChunkedFolderContent& Content)
	{
		FolderContent Result = {.Platform = Content.Platform};
		Result.Paths		 = Content.Paths;
		Result.RawSizes		 = Content.RawSizes;
		Result.Attributes	 = Content.Attributes;
		Result.ModificationTicks.resize(Result.Paths.size(), 0);
		uint64_t AttributeIndex = 0;
		for (uint64_t& ModificationTick : Result.ModificationTicks)
		{
			ModificationTick = ++AttributeIndex;
		}
		return Result;
	}
}  // namespace buildsavestate_test

TEST_CASE("buildsavestate.BuildsSelection")
{
	using namespace buildsavestate_test;

	const BuildsSelection Selection = MakeBuildsSelectionA();

	CbObjectWriter Writer;
	BuildsSelection::Write(Selection, Writer);
	CbObject SavedObject = Writer.Save();

	BuildsSelection ReadbackSelection = BuildsSelection::Read(SavedObject, nullptr);

	CHECK(Equal(Selection, ReadbackSelection));
}

TEST_CASE("buildsavestate.BuildsState")
{
	using namespace buildsavestate_test;

	FastRandom Random;

	BuildState State = MakeBuildStateA(Random);

	CbObjectWriter Writer;
	BuildState::Write(State, Writer);
	CbObject SavedObject = Writer.Save();

	BuildState ReadbackState = BuildState::Read(SavedObject);

	CHECK(Equal(State, ReadbackState));
}

TEST_CASE("buildsavestate.BuildsSaveState")
{
	using namespace buildsavestate_test;

	FastRandom Random;

	BuildState	   State	   = MakeBuildStateA(Random);
	FolderContent  FolderState = MakeFolderContent(State.ChunkedContent);
	BuildSaveState SaveState   = {.State	   = std::move(State),
								  .FolderState = std::move(FolderState),
								  .LocalPath   = "\\\\?\\E:\\temp\\localpath"};

	CbObjectWriter Writer;
	BuildSaveState::Write(SaveState, Writer);
	CbObject SavedObject = Writer.Save();

	BuildSaveState ReadbackSavedState = BuildSaveState::Read(SavedObject);

	CHECK(Equal(SaveState, ReadbackSavedState));
}

TEST_CASE("buildsavestate.BuildsDownloadInfo")
{
	using namespace buildsavestate_test;

	BuildsDownloadInfo DownloadInfo = {.Selection	  = MakeBuildsSelectionA(),
									   .LocalPath	  = "\\\\?\\E:\\temp\\localpath",
									   .StateFilePath = "\\\\?\\E:\\temp\\localpath\\.zen\\state.cbo",
									   .Iso8601Date	  = DateTime::Now().ToIso8601()};

	CbObjectWriter Writer;
	BuildsDownloadInfo::Write(DownloadInfo, Writer);
	CbObject SavedObject = Writer.Save();

	BuildsDownloadInfo ReadbackDownloadInfo = BuildsDownloadInfo::Read(SavedObject);

	CHECK(Equal(DownloadInfo, ReadbackDownloadInfo));
}

TEST_CASE("buildsavestate.DownloadedPaths")
{
	using namespace buildsavestate_test;

	ScopedTemporaryDirectory SystemDir;

	BuildsDownloadInfo DownloadInfoA = {.Selection	   = MakeBuildsSelectionA(),
										.LocalPath	   = "\\\\?\\E:\\temp\\localpathA",
										.StateFilePath = "\\\\?\\E:\\temp\\localpathA\\.zen\\state.cbo",
										.Iso8601Date   = DateTime(DateTime::Now().GetTicks() - 200).ToIso8601()};

	BuildsDownloadInfo DownloadInfoB = {.Selection	   = MakeBuildsSelectionB(),
										.LocalPath	   = "\\\\?\\E:\\temp\\localpathB",
										.StateFilePath = "\\\\?\\E:\\temp\\localpathB\\.zen\\state.cbo",
										.Iso8601Date   = DateTime(DateTime::Now().GetTicks() - 100).ToIso8601()};

	AddDownloadedPath(SystemDir.Path(), DownloadInfoA);
	AddDownloadedPath(SystemDir.Path(), DownloadInfoB);

	std::vector<std::filesystem::path> DownloadedPaths = GetDownloadedStatePaths(SystemDir.Path());

	CHECK_EQ(2u, DownloadedPaths.size());
	BuildsDownloadInfo ReadBackDownloadInfo0 = ReadDownloadedInfoFile(DownloadedPaths[0]);
	BuildsDownloadInfo ReadBackDownloadInfo1 = ReadDownloadedInfoFile(DownloadedPaths[1]);

	if (DownloadInfoA.LocalPath == ReadBackDownloadInfo0.LocalPath)
	{
		CHECK(Equal(DownloadInfoA, ReadBackDownloadInfo0));
		CHECK(Equal(DownloadInfoB, ReadBackDownloadInfo1));
	}
	else
	{
		CHECK(Equal(DownloadInfoA, ReadBackDownloadInfo1));
		CHECK(Equal(DownloadInfoB, ReadBackDownloadInfo0));
	}
}

#endif	// ZEN_WITH_TESTS

}  // namespace zen