enforce-single-head = yes prevents commit, although there are no multiple heads

[Sushil Khanchi]

On Thu, Dec 17, 2020 at 2:03 PM Uwe Brauer <oub at mat.ucm.es> wrote:

> >>> "AB" == Arne Babenhauserheide <arne_bab at web.de> writes:
>
> > Uwe Brauer <oub at mat.ucm.es> writes:
>
> >> [experimental]
> >> enforce-single-head = yes
> > …
> >> abort: 3 heads on "default"
> >> (cbf9827aaa0b, c5126e027526, aa50036267da)
> >>
> >> So I deleted the option and commited again, however when running
> >> hg heads
> >>
> >> It returned one head not three
>
> > Could they be closed? You can check with
>
> > hg heads --closed
>
> Hm, good idea thanks but no:
>
> hg heads --closed
>
> Gives
>
>
> changeset:   900:597cb79b1cdf
> branch:      year-2020-21
> tag:         tip
> topic:       covid19
> user:        Uwe Brauer <oub at mat.ucm.es>
> date:        Thu Dec 17 08:45:03 2020 +0100
> summary:     Typos and switch to email
>
> Buy when I run
>
> hg  -r tip -T '{count(revset("head()"))}\n'
>
>
> It return
>
> 17 heads
>
> What the heck is going on?
>
> Maybe hg heads is buggy (for the version I use).
>

Yes, if the working directory parent has an active topic `hg heads` gives
an incorrect result. There is a Merge Request to fix this which will be
merged soon. See
https://foss.heptapod.net/mercurial/evolve/-/merge_requests/286


> Please have a  look at this graph  (from a test repository


>
> ◍  changeset:   4:047eecd044a9
> │  Branch:      default
> │  tag:         tip
> │  Author:      Uwe Brauer <oub at mat.ucm.es>
> │  Date:        Tue, 15 Dec 2020 18:22:55 +0100
> │  Topic:       ThirdTopic
> │  Phase:       draft
> │  Summary:     Second head
> │
> │ ○  changeset:   3:c1b67b9c43dc
> │ │  Branch:      default
> │ │  Author:      Uwe Brauer <oub at mat.ucm.es>
> │ │  Date:        Tue, 15 Dec 2020 18:18:09 +0100
> │ │  Topic:       SecondTopic
> │ │  Phase:       draft
> │ │  Summary:     Fourth
> │ │
> │ ○  changeset:   2:000be01362b3
> │╱   Branch:      default
> │    Author:      Bernhard Riemann <bernhard.riemann at gmail.com>
> │    Date:        Tue, 15 Dec 2020 18:18:09 +0100
> │    Topic:       FirstTopic
> │    Phase:       draft
> │    Summary:     Third
>
>
> Hg heads only returns
>
>
> changeset:   4:047eecd044a9
> tag:         tip
> topic:       ThirdTopic
> parent:      1:7a628e187155
> user:        Uwe Brauer <oub at mat.ucm.es>
> date:        Tue Dec 15 18:22:55 2020 +0100
> summary:     Second head
>
>
> Which looks incorrect to me.
>
> But
>
> hg  -r tip -T '{count(revset("head()"))}\n'
>
> Returns
>
> 4.
>
> Maybe I should interpolate ;-)
>
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