Setuptools disappeared from Arm64 and s390x build images

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1

We use pip3 install ... in our Arm64 and s390x builds. It used to work with the previous build images, example here (arm64 image build “Tue May 26 10:08:22 UTC 2020”).

It doesn’t work anymore with the new build images, example here (arm64 image build “Tue Sep 15 13:14:36 UTC 2020”).

$ pip3 install -e dev/archery[docker]
Obtaining file:///home/travis/build/apache/arrow/dev/archery
    Complete output from command python setup.py egg_info:
    Traceback (most recent call last):
      File "<string>", line 1, in <module>
    ModuleNotFoundError: No module named 'setuptools'
2

This thread may be of help to you: Python development versions no longer include pip (due to virtualenv 20.x) - #5 by BanzaiMan

3

pip3 – or any other modules – are not guaranteed to be preinstalled for the system Python: https://docs.travis-ci.com/user/reference/bionic/#python-support mentions nothing of the kind. In fact, it’s missing altogether in the AMD64 image.

Although a preinstalled Pip without Setuptools is definitely broken (and it’s a mystery to me how that could happen), you cannot rely on its presence anyway.