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[3.13] gh-81520: Document unexpected os.path.ismount behaviour with btrfs subvolumes (GH-136058) #136473

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Jul 9, 2025
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[3.13] gh-81520: Document unexpected os.path.ismount behaviour with btrfs subvolumes (GH-136058) #136473

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7 changes: 4 additions & 3 deletions Doc/library/os.path.rst
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Expand Up @@ -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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