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76492b25ae
virtualenv on Ubuntu 16.04, when creating a new environment, downloads
the current version of setuptools, then replaces its pkg_resources
with an old copy from
/usr/share/python-wheels/pkg_resources-0.0.0-py2.py3-none-any.whl.
This causes problems, a simple example of which is reproducible from
the ubuntu:16.04 Docker base image as follows:
apt-get update
apt-get -y install python3-virtualenv
python3 -m virtualenv -p python3 /ve
/ve/bin/pip install sockjs-tornado
/ve/bin/pip download sockjs-tornado
→ `AttributeError: '_NamespacePath' object has no attribute 'sort'`
More relevantly, it breaks pip-compile in the same way. To fix this,
we need to force setuptools to be reinstalled, even if we’re asking
for the same version.
Signed-off-by: Anders Kaseorg <anders@zulipchat.com>