RE: dectree.py uses env python3 rather than configured python

[Taylor Simpson]

> -----Original Message-----
> From: John Snow <jsnow@redhat.com>
> Sent: Tuesday, April 6, 2021 2:38 PM
> To: Dr. David Alan Gilbert <dgilbert@redhat.com>; Taylor Simpson
> <tsimpson@quicinc.com>
> Cc: qemu-devel@nongnu.org
> Subject: Re: dectree.py uses env python3 rather than configured python
>
> On 4/6/21 2:50 PM, Dr. David Alan Gilbert wrote:
> > Hi Taylor,
> >    I tripped over dectree.py using 'env python3'; the qemu configure
> > script lets you specify a python with e.g.:
> >      --with-python=/usr/libexec/platform-python
> >
> > and I think everywhere else in qemu uses the configured python.
> > (This host, like most standard rhel8, doesn't have a python3 binary out
> > of the box)
> >
> > Dave
> >
>
> Hi,
>
> Instead of allowing meson to invoke this script directly (and have the
> shebang be processed by the shell), meson ought to be taught to invoke
> it directly using the user's configured python interpreter.
>
> The shebang "#!/usr/bin/env python3" is otherwise the correct one to
> use, and should (probably) be left alone.
>
> --js

Yes, I think meson.build would be the right place to change the behavior.

On the other hand, isn't python3 standard for building qemu now?  This page
https://wiki.qemu.org/Hosts/Linux#Required_additional_packages
lists python3 as an additional required package for RHEL8.

Thanks,
Taylor