dir_fd support is good in `os` module. but tempfile module lack support of that great feature. Please add.

Do you want to provide a patch Mark?

Yes, can I do it on, say, github ?

See a guide: https://docs.python.org/devguide/.

I started looking at this issue.

I may need to propagate the change (adding dir_fd as a keyword argument) to multiple functions in posixpath module: Functions like abspath, join, isdir, etc. The alternative will be to have the logic in tempfile module which feels off to me.

Does anyone have an issue with that ?

I think it is better to not change posixpath for now. And it is not necessary. But shutil.rmtree() needs to support file descriptors, and it is not trivial issue.

I have also almost finished this issue (only needed to add some tests and docs).

Alright, I'll stop working on it then, thanks for the fix !

There are two ways of supporting an open file descriptor to a directory:

1. Accept a file descriptor as the dir argument.
2. Add a new parameter dir_fd; dir will then be a path relative to dir_fd.

The original proposition is option 2. PR 31785 implements option 1. I am going to play with the code, implement option 2, and see what is simpler and what is more convenient.

Any thoughts or suggestions?