Re: [Qemu-devel] [PATCH] Deprecate Python 2 support

[Eduardo Habkost]

On Wed, May 08, 2019 at 02:50:00PM +0200, Markus Armbruster wrote:
> Daniel P. Berrangé <address@hidden> writes:
> 
> > On Tue, May 07, 2019 at 12:38:14PM +0200, Kevin Wolf wrote:
> >> Am 03.05.2019 um 21:37 hat Eduardo Habkost geschrieben:
> >> > Python 2 will reach end of life in January 1 2020.  Declare it as
> >> > deprecated.
> >> > 
> >> > Signed-off-by: Eduardo Habkost <address@hidden>
> >> > ---
> >> >  configure            | 8 ++++++++
> >> >  qemu-deprecated.texi | 8 ++++++++
> >> >  2 files changed, 16 insertions(+)
> >> > 
> >> > diff --git a/configure b/configure
> >> > index 5b183c2e39..50385061ed 100755
> >> > --- a/configure
> >> > +++ b/configure
> >> > @@ -6461,6 +6461,14 @@ if test "$supported_os" = "no"; then
> >> >      echo "us upstream at address@hidden"
> >> >  fi
> >> >  
> >> > +# Note that if the Python conditional here evaluates True we will exit
> >> > +# with status 1 which is a shell 'false' value.
> >> > +if ! $python -c 'import sys; sys.exit(sys.version_info < (3,0))'; then
> >> > +  echo
> >> > +  echo "WARNING: Python 2 support is deprecated" >&2
> >> > +  echo "WARNING: Python 3 will be required for building future versions 
> >> > of QEMU" >&2
> >> > +fi
> >> 
> >> While it's clear that we want to get rid of Python 2, did we actually
> >> discuss how to decide what the new minimum Python version is? I don't
> >> think any major distribution uses 3.0, which was released in 2008, so
> >> this doesn't seem to make a lot of sense to me as the new minimum.
> 
> Good point.
> 
> >> Currently, 3.6 seems to be a commonly available version. It looks like
> >> Debian stable is at 3.5 still, though it might become oldstable before
> >> the next QEMU release. Do we need to support anything older than that?
> >
> > Per our support build platform doc, the oldest distros we care about will
> > be RHEL-7 and Debian Jessie.  Except we can drop Jessie 2 years after
> > Stretch was released. IOW, we can drop Jessie in June this year, which
> > is before our next releasee. So we don't need to care about the 3.4
> > version in Jessie.
> >
> > RHEL-7 doesn't have py3 at all in standard distros, but it can be obtained
> > via software collections and this has 3.6
> >
> > Debian Strech has 3.5.3, so 3.5 looks like our min viable version.
> 
> Eduardo, care to update configure accordingly?

I'll do it as a separate patch, because updating the minimum
Python 3.x version (which is 3.0 right now) is independent from
Python 2 deprecation.

-- 
Eduardo