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VCS invocation merges stdout and stderr, resulting in output parsing error

See original GitHub issue

Environment

pip version: 19.3.1
Python version: 2.7
OS: fedora

Due to a bug in mercurial, if both the split and evolve extension are enabled, mercurial will output a warning (on stderr) whenever it runs. When pip calls hg root to get the path of an editable install, pip captures both stdout and stderr, and so includes the warning as part of the path to the root of the repository and fails.

This can be reproduced with the following .hgrc:

[extensions]
evolve =
split =

and installing the evolve extensions pip install hg-evolve.

Issue Analytics

State:
Created 4 years ago
Comments:7 (5 by maintainers)

Top GitHub Comments

2reactions

deveshkscommented, May 5, 2020

I think this is similar to what I observed in svn in https://github.com/pypa/pip/issues/7968 .

I have also created a PR for this (https://github.com/pypa/pip/pull/7969) which removes the behavior of vcs commands of merging stderr and stdout, and makes VCS commands use their own call_subprocess. Could you try it out and see if this fixes the hg issue?

1reaction

uranusjrcommented, Jan 15, 2020

I’ll probably work on this after #7593. Some refactoring would improve the code touched by that PR, and would fix this bug en passant.