mirror of
https://github.com/ClickHouse/ClickHouse.git
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73 lines
2.0 KiB
C++
73 lines
2.0 KiB
C++
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#include <sys/stat.h>
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#include <unistd.h>
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#include <string>
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#include <iostream>
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#include <Poco/DirectoryIterator.h>
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#include <Poco/File.h>
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#include <DB/Core/Exception.h>
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#include <DB/Core/ErrorCodes.h>
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static void localBackupImpl(Poco::Path source_path, Poco::Path destination_path, size_t level)
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{
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if (level >= 1000)
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throw DB::Exception("Too deep recursion");
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std::cerr << source_path.toString() << ", " << destination_path.toString() << "\n";
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Poco::File(destination_path).createDirectories();
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Poco::DirectoryIterator dir_end;
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for (Poco::DirectoryIterator dir_it(source_path); dir_it != dir_end; ++dir_it)
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{
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Poco::Path source = dir_it.path();
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Poco::Path destination = destination_path;
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destination.append(dir_it.name());
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if (!dir_it->isDirectory())
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{
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dir_it->setReadOnly();
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std::string source_str = source.toString();
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std::string destination_str = destination.toString();
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/** Пытаемся создать hard link.
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* Если он уже существует, то проверим, что source и destination указывают на один и тот же inode.
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*/
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if (0 != link(source_str.c_str(), destination_str.c_str()))
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{
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if (errno == EEXIST)
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{
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auto link_errno = errno;
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struct stat source_descr;
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struct stat destination_descr;
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if (0 != lstat(source_str.c_str(), &source_descr))
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DB::throwFromErrno("Cannot stat " + source_str);
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if (0 != lstat(destination_str.c_str(), &destination_descr))
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DB::throwFromErrno("Cannot stat " + destination_str);
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if (source_descr.st_ino != destination_descr.st_ino)
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DB::throwFromErrno("Destination file " + destination_str + " is already exist and have different inode.", 0, link_errno);
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}
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else
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DB::throwFromErrno("Cannot link " + source_str + " to " + destination_str);
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}
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}
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else
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{
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localBackupImpl(source, destination, level + 1);
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}
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}
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}
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void localBackup(Poco::Path source_path, Poco::Path destination_path)
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{
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localBackupImpl(source_path, destination_path, 0);
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}
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