From 2e7c024c4743460a263bf6b1f713a5e8906b9edd Mon Sep 17 00:00:00 2001 From: Klaus Aehlig Date: Mon, 10 Mar 2025 10:43:53 +0100 Subject: Add library for atomically writing files ... by using the write-rename dance. This allows processes waiting for pid or similar files to rely on the information being available as soon as the file is available. (cherry-picked from 1efdbe20d506990028caccbfbc7fd241b5a01a99) --- src/buildtool/file_system/atomic.hpp | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) create mode 100644 src/buildtool/file_system/atomic.hpp (limited to 'src/buildtool/file_system/atomic.hpp') diff --git a/src/buildtool/file_system/atomic.hpp b/src/buildtool/file_system/atomic.hpp new file mode 100644 index 00000000..40c6e4ce --- /dev/null +++ b/src/buildtool/file_system/atomic.hpp @@ -0,0 +1,30 @@ +// Copyright 2025 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. + +#ifndef INCLUDED_SRC_BUILDTOOL_FILE_SYSTEM_ATOMIC_HPP +#define INCLUDED_SRC_BUILDTOOL_FILE_SYSTEM_ATOMIC_HPP + +#include + +class FileSystemAtomic { + + public: + /// \brief Write file atomically + /// First write the contents to a temporary file in the same directory; only + /// once completed, rename the fie to the final destination. + static auto WriteFile(std::string const& filename, + std::string const& content) noexcept -> bool; +}; + +#endif -- cgit v1.2.3