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assertion when using --no-cache-dir in 19.0

See original GitHub issue

Environment

pip version: 19.0
Python version: 3.6.7
OS: Linux 50de819ca3ba 4.9.125-linuxkit #1 SMP Fri Sep 7 08:20:28 UTC 2018 x86_64 GNU/Linux

Running in a dockerfile.

Description

The following command works with pip 18.1 and fails with 19.0.

pip3 install --no-cache-dir --upgrade -r requirements.txt

With 19.0, it fails with the following exception:

Exception:
Traceback (most recent call last):
  File "/Users/scotts/.virtualenvs/python3/lib/python3.6/site-packages/pip/_internal/cli/base_command.py", line 176, in main
    status = self.run(options, args)
  File "/Users/scotts/.virtualenvs/python3/lib/python3.6/site-packages/pip/_internal/commands/install.py", line 346, in run
    session=session, autobuilding=True
  File "/Users/scotts/.virtualenvs/python3/lib/python3.6/site-packages/pip/_internal/wheel.py", line 848, in build
    assert building_is_possible
AssertionError

Removing the --no-cache-dir flag causes the install to succeed. requirements.txt

Issue Analytics

State:
Created 5 years ago
Reactions:84
Comments:56 (18 by maintainers)

Top GitHub Comments

51reactions

pradyunsgcommented, Jan 23, 2019

pip 19.0.1 is out with the fix for this issue.

22reactions

burkestarcommented, Jan 23, 2019

Seems like the pip maintainers should rollback the recent 19 release to address this breaking change? 19.0 release notes: https://github.com/pypa/pip/blob/master/NEWS.rst#190-2019-01-22

UPDATE: not trying to cast aspersions here, was just suggesting as one way to quickly unblock people affected by this seeing as the release had just happened. Rolling forward with a hotfix works too. I appreciate the hard work of the community that supports this mission critical tooling, and agree with the sentiments below about postmortems to learn from mistakes and prevent future issues. Meanwhile, we are doing the same internally, which means a liberal amount of hardpinning pip versions in all the places 😃

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