What does the "EXDEV: cross-device link not permitted" error mean?

Question

What does this error actually mean? What is a "cross-device link"?

It is mentioned on this libuv page but it doesn't give any details beyond "cross-device link not permitted".

score 30 · Answer 1 · answered Apr 04 '17 at 11:53

30

It sounds like you're trying to rename a file across "device" (partition) boundaries.

Say that /tmp is a different partition than /. That means that you're not allowed to do this:

fs.rename('/tmp/myfile.txt', '/myfile.txt', ...)

(the same applies to fs.renameSync() as well, obviously)

If you want to do that, you need to first copy the file to its new location, and subsequently remove the old file. There are modules, like mv, that can help you with that.

answered Apr 04 '17 at 11:53

robertklep

185,685
31
370
359

4

Using the combination of **copyFile** and **unlink** in the File System module should also do the trick. – Amir Syafrudin Apr 19 '18 at 08:06
3

@AmirSyafrudin true, but `fs.copyFile` didn't exist at the time I wrote this answer :D – robertklep Apr 19 '18 at 20:06
2

Indeed. Just wanted to add it in case any newbies such as myself stumbled upon your answer. :) – Amir Syafrudin Apr 20 '18 at 20:39
Code example for this solution here: https://stackoverflow.com/a/44146825/5701 – Sean O May 12 '20 at 15:30
@SeanO with the additional remark that it reads the entire file into memory first – robertklep May 12 '20 at 17:15

score 18 · Accepted Answer · answered Apr 04 '17 at 11:57

It is used for EXDEV on Linux:

See man rename manpage:

http://man7.org/linux/man-pages/man2/rename.2.html

EXDEV oldpath and newpath are not on the same mounted filesystem. (Linux permits a filesystem to be mounted at multiple points, but rename() does not work across different mount points, even if the same filesystem is mounted on both.)

This error is also used when there is ERROR_NOT_SAME_DEVICE on Windows, see:

https://github.com/libuv/libuv/blob/v1.x/src/win/error.c#L166

For more info see:

http://errorco.de/win32/winerror-h/error_not_same_device/0x80070011/

winerror.h 0x80070011 #define ERROR_NOT_SAME_DEVICE The system cannot move the file to a different disk drive.

score 9 · Answer 3 · answered Jul 27 '20 at 06:03

I guess you are trying to copy a file from /temp folder since the form. I solved it coping, not renaming

        fs.copyFile(oldpath, newpath, function (err) {
            if (err) throw err;
            res.write('File uploaded and moved!');
            res.end();
        });

score 3 · Answer 4 · answered Sep 10 '19 at 13:13

3

Just for they guys who are using Linux this happens when your old path i.e. /tmp and new path are on different partitions or disks.

answered Sep 10 '19 at 13:13

Suleman Hasib

99
8

What does the "EXDEV: cross-device link not permitted" error mean?

4 Answers4

Linked