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diff --git a/src/buildtool/file_system/atomic.hpp b/src/buildtool/file_system/atomic.hpp
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+++ b/src/buildtool/file_system/atomic.hpp
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+// 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 <string>
+
+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