From: Michael J Gruber <git@grubix.eu>
To: Junio C Hamano <gitster@pobox.com>
Cc: git@vger.kernel.org, Lars Schneider <larsxschneider@gmail.com>,
Luke Diamand <luke@diamand.org>
Subject: Re: [PATCH v3 3/4] name-rev: provide debug output
Date: Mon, 3 Apr 2017 16:46:01 +0200 [thread overview]
Message-ID: <c85bc2a1-56d8-8a02-6089-2b8cb3d39e99@grubix.eu> (raw)
In-Reply-To: <xmqqzig1xpm6.fsf@gitster.mtv.corp.google.com>
Junio C Hamano venit, vidit, dixit 31.03.2017 20:33:
> Junio C Hamano <gitster@pobox.com> writes:
>
>> Michael J Gruber <git@grubix.eu> writes:
>>
>>>> The only case that this change may make a difference I can think of
>>>> is when you have a tag object pointed at from outside refs/tags
>>>> (e.g. refs/heads/foo is a tag object); if you are trying to change
>>>> the definition of "from_tag" from the current "Is the tip inside
>>>> refs/tags/?" to "Is the tip either inside refs/tags/ or is it a tag
>>>> object anywhere?", that may be a good change (I didn't think things
>>>> through, though), but that shouldn't be hidden inside a commit that
>>>> claims to only add support for debugging.
>>>>
>>>> What problem are you solving?
>>>
>>> Sorry, I forgot about that change and failed to mention it.
>>>
>>> It makes no difference in the non-debug case which cares about the
>>> Boolean only. In the debug case, I want to distinguish between
>>> annotated and lightweight tags, just like describe --debug does. By
>>> adding 1 via deref and passing this down, I know that an annotated tag
>>> gets the value 2, a lightweight tag 1 and everything else 0, just like
>>> describe --tags.
>>
>> So it sounds like you meant to do something else, and the
>> implementation is wrong for that something else (i.e. it wouldn't do
>> the right thing for a tag object outside refs/tags/, with or without
>> the "--debug" option passed).
>
> The damage seems worse, but I may be misreading the code.
>
> is_better_name() compares name->from_tag and from_tag numerically,
> because it was designed to take a boolean view of that variable.
> Now, an artificially bumped 2 gets compared with name->from_tag that
> may be 1 and gets different priority. That artificially inflated
> value may be propagated to name->from_tag when the current tip is
> judged as a better basis for naming the object.
No, I checked not to change the existing behaviour.
If you look at the comment above that then you see that one of the sides
of the comparison is a non-tag, so we compare 0 to 1 or 2, the boolean
outcome being the same.
> If this change is only for debugging, perhaps inside if(data->debug)
> you added, instead of looking at from_tag, you can look at both
> from_tag and deref to choose which prio-nmes to show, without
> butchering the value in from_tag variable to affect the existing
> code that is exercised with or without --debug?
What I did overlook, though, was that name-rev uses the notion "under
refs/tags" for "being a tag".
In fact, it's puzzling how different describe and name-rev proceed and
weigh the alternatives. I didn't mean to change that.
In retrospect, displaying the "same" debug information for the two
commands doesn't make too much sense as long as they use different
information. name-rev does-not distinguish between tag types, so why
even display it?
I think I should change 3/4 to display exactly those bits that name-rev
actually uses for weighing different possible descriptions; they are
differents from the "describe-bits". So please withhold 3/4 and 4/4.
Michael
next prev parent reply other threads:[~2017-04-03 14:46 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-03-15 13:15 [PATCH 0/3] describe --contains sanity Michael J Gruber
2017-03-15 13:15 ` [PATCH 1/3] describe: debug is incompatible with contains Michael J Gruber
2017-03-15 19:21 ` Junio C Hamano
2017-03-17 10:54 ` Michael J Gruber
2017-03-15 13:15 ` [PATCH 2/3] git-prompt: add a describe style for any tags Michael J Gruber
2017-03-15 19:25 ` Junio C Hamano
2017-03-17 10:56 ` Michael J Gruber
2017-03-15 13:15 ` [RFD PATCH 3/3] name-rev: Allow lightweight tags and branch refs Michael J Gruber
2017-03-15 16:14 ` Junio C Hamano
2017-03-15 19:50 ` Junio C Hamano
2017-03-15 20:51 ` Junio C Hamano
2017-03-15 22:50 ` [PATCH 0/2] Teach name-rev to pay more attention to lightweight tags Junio C Hamano
2017-03-15 22:50 ` [PATCH 1/2] name-rev: refactor logic to see if a new candidate is a better name Junio C Hamano
2017-03-15 22:50 ` [PATCH 2/2] name-rev: favor describing with tags and use committer date to tiebreak Junio C Hamano
2017-03-17 4:07 ` Lars Schneider
2017-03-17 5:45 ` Junio C Hamano
2017-03-17 5:56 ` Junio C Hamano
2017-03-17 17:09 ` Lars Schneider
2017-03-17 17:17 ` Junio C Hamano
2017-03-17 22:43 ` Junio C Hamano
2017-03-29 14:39 ` [PATCH v2 0/3] name-rev sanity Michael J Gruber
2017-03-29 14:39 ` [PATCH v2 1/3] name-rev: refactor logic to see if a new candidate is a better name Michael J Gruber
2017-03-29 14:39 ` [PATCH v2 2/3] name-rev: favor describing with tags and use committer date to tiebreak Michael J Gruber
2017-03-29 14:39 ` [PATCH v2 3/3] name-rev: provide debug output Michael J Gruber
2017-03-29 17:15 ` [PATCH v2 0/3] name-rev sanity Junio C Hamano
2017-03-29 17:43 ` Junio C Hamano
2017-03-30 13:48 ` Michael J Gruber
2017-03-30 17:30 ` Junio C Hamano
2017-03-31 13:51 ` [PATCH v3 0/4] " Michael J Gruber
2017-03-31 13:51 ` [PATCH v3 1/4] name-rev: refactor logic to see if a new candidate is a better name Michael J Gruber
2017-03-31 13:51 ` [PATCH v3 2/4] name-rev: favor describing with tags and use committer date to tiebreak Michael J Gruber
2017-03-31 13:51 ` [PATCH v3 3/4] name-rev: provide debug output Michael J Gruber
2017-03-31 16:52 ` Junio C Hamano
2017-03-31 16:55 ` Junio C Hamano
2017-03-31 18:02 ` Michael J Gruber
2017-03-31 18:06 ` Junio C Hamano
2017-03-31 18:33 ` Junio C Hamano
2017-04-03 14:46 ` Michael J Gruber [this message]
2017-04-03 17:07 ` Junio C Hamano
2017-05-20 5:19 ` Junio C Hamano
2017-03-31 19:10 ` Junio C Hamano
2017-03-31 13:51 ` [PATCH v3 4/4] describe: pass --debug down to name-rev Michael J Gruber
2017-03-17 11:25 ` [PATCH 2/2] name-rev: favor describing with tags and use committer date to tiebreak Michael J Gruber
2017-03-17 16:03 ` Junio C Hamano
2017-03-16 0:14 ` [PATCH 0/2] Teach name-rev to pay more attention to lightweight tags Stefan Beller
2017-03-16 10:28 ` Jacob Keller
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