1 | #include <Common/createHardLink.h> |
2 | #include <Common/Exception.h> |
3 | #include <errno.h> |
4 | #include <unistd.h> |
5 | #include <sys/stat.h> |
6 | |
7 | |
8 | namespace DB |
9 | { |
10 | |
11 | namespace ErrorCodes |
12 | { |
13 | extern const int CANNOT_STAT; |
14 | extern const int CANNOT_LINK; |
15 | } |
16 | |
17 | void createHardLink(const String & source_path, const String & destination_path) |
18 | { |
19 | if (0 != link(source_path.c_str(), destination_path.c_str())) |
20 | { |
21 | if (errno == EEXIST) |
22 | { |
23 | auto link_errno = errno; |
24 | |
25 | struct stat source_descr; |
26 | struct stat destination_descr; |
27 | |
28 | if (0 != lstat(source_path.c_str(), &source_descr)) |
29 | throwFromErrnoWithPath("Cannot stat " + source_path, source_path, ErrorCodes::CANNOT_STAT); |
30 | |
31 | if (0 != lstat(destination_path.c_str(), &destination_descr)) |
32 | throwFromErrnoWithPath("Cannot stat " + destination_path, destination_path, ErrorCodes::CANNOT_STAT); |
33 | |
34 | if (source_descr.st_ino != destination_descr.st_ino) |
35 | throwFromErrnoWithPath( |
36 | "Destination file " + destination_path + " is already exist and have different inode." , |
37 | destination_path, ErrorCodes::CANNOT_LINK, link_errno); |
38 | } |
39 | else |
40 | throwFromErrnoWithPath("Cannot link " + source_path + " to " + destination_path, destination_path, |
41 | ErrorCodes::CANNOT_LINK); |
42 | } |
43 | } |
44 | |
45 | } |
46 | |