Subject: 5.9 freeze, Windows, regression-fixes and Python 2 drop

[Raphaël Gomès]

Also relevant to fix before the release: 
https://phab.mercurial-scm.org/D11052

On 7/13/21 3:47 PM, Raphaël Gomès wrote:
> Hi all,
>
> As you know, the 5.9 freeze is coming up and should happen on the 18th 
> of July.
>
> This release will be a special one since, as of yesterday¹, all 
> critical tests pass on our Windows Python 3 Heptapod CI. Tests related 
> to extensions (like SVN support, `remotefilelog`, etc.) still have to 
> be worked on and there is minor flakyness with a few tests², but the 
> message is: I vote that this be the first release to support Python 3 
> Windows officially and the last to support Python 2 altogether. This 
> will give us enough time to iron out the details in time for the 6.0 
> release to be the first Python 3 only release of Mercurial.
>
> For the past few versions we haven't had much of a real freeze, which 
> I think makes sense given the volume of contributions and the 
> relatively good track-record of (lack of) regressions, but this time I 
> want to propose that we observe a real freeze to dedicate at least 
> some time to fixing the issues we're having and stabilizing the new 
> stuff.
>
> To name some things explicitly:
>   - The parent ordering issue³ which is almost 50% why I'm advocating 
> for the freeze⁴
>   - Windows Python 3 support and improving CI coverage
>   - `chg` now almost consistently times out some tests
>   - `test-chg.t` is super flaky because of `sleep` calls
>   - Bugs that have began building a settlement in bugzilla
>
> I, for one, am happy that the end of the Py2 era is finally visible at 
> the end of the tunnel and would like to thank all involved in the 
> recent Windows endeavor.
>
> Lastly, the Heptapod Windows CI Octobus is providing for this 
> transition will cost about 400€ per month. We're currently running on 
> free credit we have thanks to a partnership with OVH given for use in 
> the Heptapod project, but this will run out one day and we very much 
> encourage those who can help to reach out. Octobus is a 5-people 
> European team already funding the development of Heptapod out of 
> pocket, and there is only so much that can be reasonable for us to 
> shoulder in the long-run.
>
> What are your thoughts?
> Raphaël
>
> [1] https://foss.heptapod.net/octobus/mercurial-devel/-/jobs/222914
> [2] https://foss.heptapod.net/octobus/mercurial-devel/-/issues/12
> [3] https://bz.mercurial-scm.org/show_bug.cgi?id=6538
> [4] Larger users, including Mozilla, are affected by the bug: 
> https://bugzilla.mozilla.org/show_bug.cgi?id=1720302
>
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