On 24.5.2018 00:56, Adam Williamson wrote:
The thing you're missing - which the Change doesn't explicitly state, so it's understandable - is the effect of having the python2 package Recommend the package with /usr/bin/python in it. For *user* systems that will mean that package always gets installed alongside python2, including that it should get installed on update/upgrade. They could then manually remove it, but this is the only way they could get into trouble - by default, both existing and new installs should have /usr/bin/python. This is because dnf's default behaviour is to install Recommends/Supplements. However, for *package builds*, Recommends/Supplements are not installed. So *package builds* which only BuildRequire python2 or whatever would not get /usr/bin/python , and would thus fail. The packager could always just add BuildRequires python-unversioned-command to "fix" the problem, which is probably the fix we don't want them to do, but at least then we have a handy way to identify recalcitrant packages, and their maintainers can't pretend they weren't aware of the problem and didn't actively decide to take the lazy way out.
I guess this needs to be added to the change proposal. I won't have time to do this now, so cc'ing Petr.
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