Jason R. Coombs <jar...@jaraco.com> added the comment:
It's because on Unix:
```
>>> os.path.relpath('/Users/jaraco/code/main/path/.flake8', '')
'.flake8'
```
But on Windows, relpath raises an error for the comparable call:
```
>>> os.path.relpath('\\\\vmware-host\\shared
>>> folders\\home\\code\\main\\path\\.flake8', '')
ValueError: path is on mount '\\\\vmware-host\\shared folders', start on mount
'C:'
```
So it seems it may not be a bug in Python, but merely a consequence of Python
3.8 honoring symlinks in realpath, and exposing the unfortunate weakness of
resolving relative real paths when root volumes aren't in a shared namespace.
Does Python have any advice for downstream users running into this or similar
issues? If they want cross-platform compatibility, must they avoid use of
realpath? Do you have any tips specific to what setuptools_scm is doing?
----------
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue40732>
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