Re: [PATCH 0/7] python: create installable package

[Kevin Wolf]

Am 17.06.2020 um 22:27 hat John Snow geschrieben:
> > In the Avocado project, we have a `make develop` rule that does that
> > for the main setup.py file, and for all plugins we carry on the same
> > tree, which is similar in some regards to the "not at the project root
> > directory" situation here with "qemu/python/setup.py".
> > 
> 
> Ah, yeah. If we're going this far, I'd prefer using a VENV over
> modifying the user's environment. That way you can blast it all away
> with a `make distclean`.
> 
> Maybe the "make develop" target could even use the presence of a .venv
> directory to know when it needs to make the environment or not ...
[..]
> For QEMU developers, installing with develop is going to be the smart
> way to go. When your git tree is updated, your package will be updated
> along with it. You can do it once and then probably forget about it.

I don't think we can make this a manual step at all. Building QEMU
requires running some Python scripts (e.g. the QAPI generator), so the
setup needs to be done either in configure or in a Makefile target that
is specified as a dependency of any rule that would run a Python script.
Building QEMU once would then be enough.

Doing it automatically also means that we have to keep things local to
the QEMU directory rather than installing them globally into the user
directory. This is desirable anyway: Most of us deal with more than one
QEMU source tree, so conflicts would be inevitable.

Kevin