Eryk Sun <[email protected]> added the comment:
In ntpath._getfinalpathname_nonstrict(), `tail` should be initialized to
`path[:0]`.
Currently `tail` is initialized to the empty string value ''. If an error
occurs that's allowed and `path` is a root directory that's passed as bytes,
then joining `path + tail` will fail if `tail` still has its initial value.
To reproduce this issue, create a substitute drive for a directory that grants
no access. For example:
import os
os.mkdir('spam')
os.system('icacls spam /inheritance:r')
os.system('subst N: spam')
>>> os.path.realpath(b'N:/')
Traceback (most recent call last):
File "C:\Program Files\Python39\lib\ntpath.py", line 647, in realpath
path = _getfinalpathname(path)
PermissionError: [WinError 5] Access is denied: b'N:\\'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "C:\Program Files\Python39\lib\ntpath.py", line 601, in
_getfinalpathname_nonstrict
path = _getfinalpathname(path)
PermissionError: [WinError 5] Access is denied: b'N:\\'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "C:\Program Files\Python39\lib\ntpath.py", line 651, in realpath
path = _getfinalpathname_nonstrict(path)
File "C:\Program Files\Python39\lib\ntpath.py", line 621, in
_getfinalpathname_nonstrict
return path + tail
TypeError: can't concat str to bytes
----------
components: +Library (Lib)
nosy: +Antoine d'Otreppe, eryksun -9001
stage: -> needs patch
title: realpath of bytestr smb drive letters fail -> [Windows]
ntpath.realpath() of bytes root directory may raise TypeError in some cases
versions: +Python 3.10
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Python tracker <[email protected]>
<https://bugs.python.org/issue43847>
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