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#pragma once
#include <optional>
#include <base/types.h>
#include <Disks/IDisk.h>
namespace DB
{
/** Creates a local (at the same mount point) backup (snapshot) directory.
*
* In the specified destination directory, it creates hard links on all source-directory files
* and in all nested directories, with saving (creating) all relative paths;
* and also `chown`, removing the write permission.
*
* This protects data from accidental deletion or modification,
* and is intended to be used as a simple means of protection against a human or program error,
* but not from a hardware failure.
*
* If max_level is specified, than only files with depth relative source_path less or equal max_level will be copied.
* So, if max_level=0 than only direct file child are copied.
*
* If `transaction` is provided, the changes will be added to it instead of performend on disk.
*/
void localBackup(const DiskPtr & disk, const String & source_path, const String & destination_path, bool make_source_readonly = true, std::optional<size_t> max_level = {}, bool copy_instead_of_hardlinks = false, const NameSet & files_to_copy_intead_of_hardlinks = {}, DiskTransactionPtr disk_transaction = nullptr);
}
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