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#include <Common/createHardLink.h>
#include <Common/Exception.h>
#include <cerrno>
#include <unistd.h>
#include <sys/stat.h>
namespace DB
{
namespace ErrorCodes
{
extern const int CANNOT_STAT;
extern const int CANNOT_LINK;
}
void createHardLink(const String & source_path, const String & destination_path)
{
if (0 != link(source_path.c_str(), destination_path.c_str()))
{
if (errno == EEXIST)
{
auto link_errno = errno;
struct stat source_descr;
struct stat destination_descr;
if (0 != lstat(source_path.c_str(), &source_descr))
throwFromErrnoWithPath("Cannot stat " + source_path, source_path, ErrorCodes::CANNOT_STAT);
if (0 != lstat(destination_path.c_str(), &destination_descr))
throwFromErrnoWithPath("Cannot stat " + destination_path, destination_path, ErrorCodes::CANNOT_STAT);
if (source_descr.st_ino != destination_descr.st_ino)
throwFromErrnoWithPath(
"Destination file " + destination_path + " is already exist and have different inode.",
destination_path, ErrorCodes::CANNOT_LINK, link_errno);
}
else
throwFromErrnoWithPath("Cannot link " + source_path + " to " + destination_path, destination_path,
ErrorCodes::CANNOT_LINK);
}
}
}
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