1#pragma once
2
3#include <optional>
4
5namespace Poco { class Path; }
6
7namespace DB
8{
9
10/** Creates a local (at the same mount point) backup (snapshot) directory.
11 *
12 * In the specified destination directory, it creates a hard links on all source-directory files
13 * and in all nested directories, with saving (creating) all relative paths;
14 * and also `chown`, removing the write permission.
15 *
16 * This protects data from accidental deletion or modification,
17 * and is intended to be used as a simple means of protection against a human or program error,
18 * but not from a hardware failure.
19 *
20 * If max_level is specified, than only files which depth relative source_path less or equal max_level will be copied.
21 * So, if max_level=0 than only direct file child are copied.
22 */
23void localBackup(const Poco::Path & source_path, const Poco::Path & destination_path, std::optional<size_t> max_level = {});
24
25}
26