From: Sergey Organov <sorganov@gmail.com>
To: Junio C Hamano <gitster@pobox.com>
Cc: Johannes Sixt <j6t@kdbg.org>, Jeff King <peff@peff.net>,
Paul Mackerras <paulus@ozlabs.org>,
Git Mailing List <git@vger.kernel.org>
Subject: Re: diff-index --cc no longer permitted, gitk is now broken (slightly)
Date: Wed, 08 Sep 2021 16:43:24 +0300 [thread overview]
Message-ID: <87pmtjkwsj.fsf@osv.gnss.ru> (raw)
In-Reply-To: <xmqqy288b64q.fsf@gitster.g> (Junio C. Hamano's message of "Tue, 07 Sep 2021 11:19:33 -0700")
Junio C Hamano <gitster@pobox.com> writes:
> Sergey Organov <sorganov@gmail.com> writes:
>
>> Here is a patch that fixes diff-index to accept --cc again:
>
> Sorry for the delay; I did not notice there was a patch buried in a
> discussion thread.
>
> We might later need to do this suppression in more codepaths if we
> find more regressions, but let's have one fix at a time.
I'm pretty positive there should be nothing left. This commit was
diff-index specific, and doesn't affect anything else. Nowhere in entire
series the semantics of --cc itself has been changed, it has been only
disabled as particular option in diff-index command-line parsing.
Overall, this is pretty local change.
>
> Will queue.
>
>> builtin/diff-index.c | 6 +++---
>> diff-merges.c | 14 ++++----------
>> diff-merges.h | 2 +-
>
> This would deserve new tests that cover the existing use cases,
> given that both of us (and other reviewers in the original thread)
> did not notice how big a regression we are causing.
I don't see it as a "big regression", but no wonder the breakage was
entirely unexpected, see below.
>
> We care about --cc naturally falling back to -p when there is only
> one other thing to compare with, and also we care about --cc that
> allows us to compare during conflict resolution, at least, I think.
The problem here is not with -c/--cc itself, it is rather with
diff-index. It's neither documented nor tested nor obvious what -c/--cc
should mean in diff-index, given -c/--cc description (e.g., in "git help
log"):
-c
With this option, diff output for a merge commit shows the
differences [...]
How an option to deal with merge commits is applicable to diff-index,
that:
git-diff-index - Compare a tree to the working tree or index
???
Besides, nobody yet told us why gitk uses --cc option in invocation of
'diff-index' in the first place. Does it actually *rely* on particular
undocumented behavior of "diff-index --cc", or is it just a copy-paste
*leftover*?
Overall, the original commit had a mistake, as the commit that was meant
to be pure refactoring had changed observable behavior, even if
undocumented. However, the essence of the commit, disabling of "diff for
merge /commits/" options in diff-index that does not deal with /commits/,
could still be the right thing to do long term.
Thanks,
-- Sergey Organov
next prev parent reply other threads:[~2021-09-08 13:43 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-30 8:03 diff-index --cc no longer permitted, gitk is now broken (slightly) Johannes Sixt
2021-08-30 13:05 ` Sergey Organov
2021-08-30 18:13 ` Jeff King
2021-08-30 20:01 ` Sergey Organov
2021-08-30 20:26 ` Johannes Sixt
2021-08-30 20:45 ` Sergey Organov
2021-08-30 17:12 ` Junio C Hamano
2021-08-30 17:40 ` Sergey Organov
2021-08-30 18:09 ` Junio C Hamano
2021-08-30 20:03 ` Sergey Organov
2021-09-01 16:52 ` Sergey Organov
2021-09-07 18:19 ` Junio C Hamano
2021-09-07 19:53 ` Sergey Organov
2021-09-08 13:43 ` Sergey Organov [this message]
2021-09-08 17:23 ` Johannes Sixt
2021-09-08 19:04 ` Sergey Organov
2021-09-09 17:07 ` Junio C Hamano
2021-09-09 20:07 ` Sergey Organov
2021-09-16 9:50 ` Sergey Organov
2021-09-16 21:15 ` Junio C Hamano
2021-09-16 22:41 ` Sergey Organov
2021-09-16 22:50 ` Junio C Hamano
2021-09-17 7:08 ` Sergey Organov
2021-09-17 16:32 ` Junio C Hamano
2021-09-17 18:41 ` Sergey Organov
2021-09-17 16:58 ` Philip Oakley
2021-09-17 17:34 ` Sergey Organov
2021-09-18 17:56 ` Sergey Organov
2021-09-07 20:32 ` Johannes Sixt
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