Mercurial 5.2 release as stable release for Python 3.

[Gregory Szorc]

I support marking the code base as stable with Python 3 in the upcoming few
weeks - at least for non-Windows.

If we're serious about this, we all need to be running Mercurial with
Python 3 locally and fixing bugs. I tried installing a Python 3 Mercurial a
few days ago and I encountered enough tracebacks to cause me to revert.
Those include https://bz.mercurial-scm.org/show_bug.cgi?id=6196 and an
issue with evolve/obsmarkers that can be reproduced by `hg push` to
hg-committed. I think we should land a patch to Makefile that changes
https://www.mercurial-scm.org/repo/hg/file/649a9601b9e2/Makefile#l8 to
`python3` to force the issue. We can revert that before tagging 5.2 if we
want to do a separate release that is Python 3 primary (there was talk of
doing a 2.7 5.2 then doing a 5.2.1 or a 5.3 a week or two later that is
Python 3 native).

We also still have a handful of test failures on Python 3. See
https://ci.hg.gregoryszorc.com/. (CI is broken with Python 3.5 for some
reason. I'll look into it.)

Python 3 on Windows has a ton of test failures. ~120 I believe. I suspect a
lot of them are the same underlying issues. I almost have my CI system
working with Windows. But we'll certainly need a bit of effort on Windows
before we can consider Python 3 stable there. At this time, Python 3 on
Windows seems to be at risk because of the volume of issues.

Other major blockers to Python 3 are packaging work. I'm the de facto
maintainer of the Windows packages and will write those patches. But my
priorities are standing up Windows CI because I think having visibility
into the test failures is more important because what good is Python 3
packages if Mercurial isn't usable :) I could also help with non-Windows
packaging if it is needed.

I would also propose we reinstate the @ code freeze for this release so we
can all focus on Python 3 and quality of life improvements for the release.
I don't think we'll put out a quality Python 3 release if we're distracted
by feature work on @.

On Mon, Oct 14, 2019 at 9:30 AM Pulkit Goyal <7895pulkit at gmail.com> wrote:

> Hey everyone,
>
> I hope you are doing well.
>
> We released 5.0 as beta release for Python 3 support and much has
> improved since than. Evolve extension recently started supporting
> Python 3. There are still few tests failing which are minor.
>
> We are planning to mark the upcoming release i.e. 5.2 as stable
> release for py3 support (except Windows). If we agree on that, we also
> plan to accept py3 related fixes on stable branch during upcoming
> feature freeze.
>
> It will be the best time to install hg on Python 3 and start testing.
>
> What do you think?
>
> Thanks and regards
> Pulkit
>
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