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Errors under Windows with installation prefix starting with \\?\

See original GitHub issue

Description

Error when pip install is run with --prefix starting with \\?\ (for example, a directory on letter-less volume in #10597, but not limited to).

pipenv install -e . calls pip with this option, so this issue hinders the use of pipenv.

Expected behavior

Successful installation

pip version

22.1.2

Python version

3.10

OS

Windows 10

How to Reproduce

pip install --ignore-installed --prefix \\?\%TEMP% setuptools

Output

Collecting setuptools
  Using cached setuptools-62.4.0-py3-none-any.whl (1.2 MB)
Installing collected packages: setuptools
ERROR: Could not install packages due to an OSError: [WinError 123] The filename, directory name, or volume label syntax is incorrect: '\\\\?\\C:\\Users\\<user>\\AppData\\Local\\Temp/Lib'

Code of Conduct

I agree to follow the PSF Code of Conduct.

Issue Analytics

State:
Created a year ago
Comments:10 (4 by maintainers)

Top GitHub Comments

1reaction

pfmoorecommented, Jul 8, 2022

Looks that you missed a question mark

Doh. Thanks for catching that 🤦 It does indeed work for me then. So scrub point 1, pathlib works fine.

0reactions

uranusjrcommented, Nov 12, 2022

It is called a UNC path, nothing special.

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