From: Jeff King <peff@peff.net>
Date: Tue, 06 Sep 2016 04:07:39 GMT
Subject: Re: 2.10.0: multiple versionsort.prereleasesuffix buggy?
Message-ID: <20160906040739.37otpk3l2wt7qfbb@sigill.intra.peff.net>
In-Reply-To: <20160906010759.14883-1-szeder@ira.uka.de>

On Tue, Sep 06, 2016 at 03:07:59AM +0200, SZEDER Gábor wrote:

> > So that seems wrong. Even weirder, if I set _only_ "-beta", I get:
> > 
> >   $ git tag -l --sort=version:refname | grep -v ^2.6.0
> >   2.6.0-beta-2
> >   2.6.0-beta-3
> >   2.6.0-beta-4
> >   2.6.0
> >   2.6.0-RC1
> >   2.6.0-RC2
> >   2.6.0-beta-1
> > 
> > Umm...what? beta-1 is sorted away from its companions? That's weird.
> > 
> > I wondered if the presence of "-" after the suffix ("beta-1" rather than
> > "beta1") would matter. It looks like that shouldn't matter, though; it's
> > purely doing a prefix match on "do these names differ at a prerelease
> > suffix".
> > 
> > But something certainly seems wrong.
> 
> Some of the weirdness is caused by the '-' at the _beginning_ of the
> suffixes, because versioncmp() gets confused by suffixes starting with
> the same character(s).

Oh, right, that makes sense. So it's effectively not finding _any_
suffix between X-RC1 and X-beta-1, because we only start looking after
"X-", and none of them match.

I am still confused why "2.6.0-beta-1" doesn't get sorted with its
peers. I'd guess that the comparison function doesn't actually provide a
strict ordering, so the results depend on the actual sort algorithm, and
which pairs it ends up comparing.

-Peff