Today we had the following error message when re-installing a project from scratch:
While: Installing. Getting section application. Initializing section application. Installing recipe zc.zope3recipes. Getting distribution for 'zc.zope3recipes==0.13.0'. Error: Couldn't find a distribution for 'zc.zope3recipes==0.13.0'.
Yes this is a really old recipe but it still exists on PyPI. We are using zc.buildout in Version 2.10, and do not use a custom index. So being forced to use HTTPS to access PyPI does not seem be the problem.
After searching way too long we found that .buildout/default.cfg contains the following statement:
allow-hosts = *.python.org *.gocept.com *.gocept.net effbot.org dist.plone.org
It restricts the allowed hosts for download but it seems to restrict the index, too. https://pypi.python.org/simple nowadays redirects to https://pypi.org/simple which is not on the list.
Suggestion: Remove allow-hosts if possible. It is more harmful than good, especially because packages are nowadays downloaded from https://files.pythonhosted.org.
UPDATE:
I filed an issue for zc.buildout at GitHub: buildout/buildout#447
The worst part is no matter how many -v options you pass to buildout, it will not tell you it’s discarding the pypi.org link because of your allow-hosts setting.
Right, this was the tricky part, which I forgot to mention. Thank you for adding it.
So it does exactly what it is supposed to do 😀
Lack of notification is the real culprit imho