ClickHouse/dbms/Storages/MergeTree/localBackup.h
Ivan 97f2a2213e
Move all folders inside /dbms one level up (#9974)
* Move some code outside dbms/src folder
* Fix paths
2020-04-02 02:51:21 +03:00

26 lines
951 B
C++

#pragma once
#include <optional>
#include <Core/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 a 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 which depth relative source_path less or equal max_level will be copied.
* So, if max_level=0 than only direct file child are copied.
*/
void localBackup(const DiskPtr & disk, const String & source_path, const String & destination_path, std::optional<size_t> max_level = {});
}