https://github.com/python/cpython/commit/591abcc01fcf1c65c7fdfaca7274f5d3f9f022da
commit: 591abcc01fcf1c65c7fdfaca7274f5d3f9f022da
branch: main
author: Oskar Roesler <o.roes...@oscloud.info>
committer: ZeroIntensity <zintensity...@gmail.com>
date: 2025-07-09T11:54:58-04:00
summary:
gh-81520: Document unexpected `os.path.ismount` behaviour with btrfs subvolumes
(GH-136058)
files:
M Doc/library/os.path.rst
diff --git a/Doc/library/os.path.rst b/Doc/library/os.path.rst
index f72aee19d8f332..1c1cf07a655ae7 100644
--- a/Doc/library/os.path.rst
+++ b/Doc/library/os.path.rst
@@ -298,9 +298,10 @@ the :mod:`glob` module.)
device than *path*, or whether :file:`{path}/..` and *path* point to the
same
i-node on the same device --- this should detect mount points for all Unix
and POSIX variants. It is not able to reliably detect bind mounts on the
- same filesystem. On Windows, a drive letter root and a share UNC are
- always mount points, and for any other path ``GetVolumePathName`` is called
- to see if it is different from the input path.
+ same filesystem. On Linux systems, it will always return ``True`` for btrfs
+ subvolumes, even if they aren't mount points. On Windows, a drive letter
root
+ and a share UNC are always mount points, and for any other path
+ ``GetVolumePathName`` is called to see if it is different from the input
path.
.. versionchanged:: 3.4
Added support for detecting non-root mount points on Windows.
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