shutil.rmtree() gets stuck on opening named pipe

[Jwata]

Bug report

Bug description:

When the target is a named pipe, shutil.rmtree() gets stuck on opening it.

# Create a named pipe
import os, tempfile
filename = os.path.join(tempfile.mkdtemp())
filename = os.path.join(tempfile.mkdtemp(), "namedpipe")
os.mkfifo(filename)

# Try to remove it
import shutil
shutil.rmtree(filename) # <- This blocks indefinitely

^CTraceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python3.11/shutil.py", line 725, in rmtree
    fd = os.open(path, os.O_RDONLY, dir_fd=dir_fd)
         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
KeyboardInterrupt

This seems to be caused by os.open() with os.O_RDONLY.

cpython/Lib/shutil.py

Line 745 in 4637a1f

fd = os.open(path, os.O_RDONLY, dir_fd=dir_fd)

(This issue seems to exist on the main branch, IIUC)

Currently, it needs to check the file type and use os.remove() if it's a named pipe.
Should this be handled inside shutil.rmtree()?

CPython versions tested on:

3.11

Operating systems tested on:

macOS

Linked PRs

• gh-116401: Fix blocking os.fwalk() and shutil.rmtree() on opening named pipe #116421
• [3.12] gh-116401: Fix blocking os.fwalk() and shutil.rmtree() on opening a named pipe (GH-116421) #116716
• [3.11] gh-116401: Fix blocking os.fwalk() and shutil.rmtree() on opening a named pipe (GH-116421) #116717