Created attachment 3230 [details]
patch

link() will fail with EXDEV when source and destination are on different mountpoints.
Unfortunately, stat().st_dev does not identify the mountpoint so that copy_license_files()
fails in bind-mount environments.

E.g.:

| # mkdir /tmp/a /tmp/b /tmp/X /tmp/X/a /tmp/X/b
| # touch /tmp/a/foo
| # mount --bind /tmp/a /tmp/X/a
| # mount --bind /tmp/b /tmp/X/b
|
| # python -c 'import os;
| print(os.stat("/tmp/X/a")).st_dev;
| print(os.stat("/tmp/X/b")).st_dev;
| os.link("/tmp/X/a/foo", "/tmp/X/b/foo")'
| 62
| 62
| Traceback (most recent call last):
|   File "<string>", line 1, in <module>
| OSError: [Errno 18] Invalid cross-device link

Patch catches errno EXDEV and tries a plain copy then.


Without this patch, I see

| WARNING: Could not copy license file generic_MIT: [Errno 18] Invalid cross-device link
| WARNING: Could not copy license file generic_MIT-style: [Errno 18] Invalid cross-device link

messages.