Installing additional packages during setup breaks corporate setups

[schlomo]

See

pytest-black/setup.py

Line 35 in d79e688

setup_requires=['setuptools_scm'],

and see pytest-dev/pytest-xdist#136 for more like that.

My problem is that I use pytest-black in a corporate setting where we don't access PyPi directly but via a local Artifactory.

I create a pip.ini pointing to that and everything works well till pytest-black is installed:

 Collecting pytest-black
   Downloading https://<CORPORATE_PYPI_MIRROR_URL>/artifactory/api/pypi/pypi-remote/packages/packages/06/5b/310316ed57560ea90cfa6a5e79cd4bf49f9869b7a12fd9905aa9c93b8a4a/pytest-black-0.3.11.tar.gz
     ERROR: Command errored out with exit status 1:
      command: 'c:\Python37\python.exe' -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'C:\\users\\root\\Temp\\pip-install-30_ojaqj\\pytest-black\\setup.py'"'"'; __file__='"'"'C:\\users\\root\\Temp\\pip-install-30_ojaqj\\pytest-black\\setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' egg_info --egg-base 'C:\users\root\Temp\pip-install-30_ojaqj\pytest-black\pip-egg-info'
          cwd: C:\users\root\Temp\pip-install-30_ojaqj\pytest-black\
     Complete output (26 lines):
     Download error on https://pypi.org/simple/setuptools_scm/: [WinError 10051] Windows Error 0x2743 -- Some packages may not be found!
     Download error on https://pypi.org/simple/setuptools-scm/: [WinError 10051] Windows Error 0x2743 -- Some packages may not be found!
     Couldn't find index page for 'setuptools_scm' (maybe misspelled?)
     Download error on https://pypi.org/simple/: [WinError 10051] Windows Error 0x2743 -- Some packages may not be found!
     No local packages or working download links found for setuptools_scm

In the log output I can see that pip install -r requirement.txt which includes pytest-black downloads pytest-black from our PyPi mirror but then setuptools tries to download setuptools_scm from PyPi directly.

So, could you please kindly fix this? Maybe not rely on pulling packages during installation, declaring them as a dependency so that pip will provide them or maybe distributing pytest-black as a wheel can help.

Thanks a lot!

[soerenwolfers]

This has been fixed in setuptools 42.0.0, which switched to using pip to resolve setup_requires (https://setuptools.readthedocs.io/en/latest/history.html#v42-0-0).