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From: Elijah Newren <>
To: Andreas Krey <>
Cc: "" <>
Subject: Re: git merge commits staged files (when two trees are identical)
Date: Thu, 21 Dec 2017 10:50:31 -0800	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

On Wed, Dec 20, 2017 at 3:43 AM, Andreas Krey <> wrote:
> Hi everybody,
> we just stumbled over a situation in which a merge commits
> staged changes into the merge commit. This happens when the
> merged-in branch does have commits ('main') but has the same
> tree ('--allow-empty') as the merge base:
>     git init
>     echo eins >a
>     git add a
>     git commit -m initial
>     git branch sub
>     git commit -m main --allow-empty
>     git checkout sub
>     : two
>     echo zwei >>a
>     git add a
>     git commit -m underway
>     : three
>     echo drei >>a
>     git add a              # important
>     git status
>     git diff --cached
>     git merge master -m 'merge'
>     git status
>     git log --cc -1
> If the change isn't staged (comment out the '# important' line)
> the change survives as unstaged.
> That is a bug?

Yes, it's definitely a bug; thanks for reporting it.  We have a
specific set of tests for this type of situation in t6044, which was
intended to test all the merge strategies and ensure they didn't have
this class of bug.  It turns out that there is an additional codepath
within one of the strategies that wasn't tested, and which you've
tripped over.  I've got some patches to fix this up that I'll respond
with shortly.

  reply	other threads:[~2017-12-21 18:50 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-12-20 11:43 git merge commits staged files (when two trees are identical) Andreas Krey
2017-12-21 18:50 ` Elijah Newren [this message]
2017-12-21 19:19   ` [PATCH 1/3] t6044: recursive can silently incorporate dirty changes in a merge Elijah Newren
2017-12-21 19:19     ` [PATCH 2/3] move index_has_changes() from builtin/am.c to merge.c for reuse Elijah Newren
2017-12-21 19:36       ` Elijah Newren
2017-12-22 20:46         ` Junio C Hamano
2017-12-23  2:26           ` Elijah Newren
2017-12-21 19:19     ` [PATCH 3/3] merge-recursive: Avoid incorporating uncommitted changes in a merge Elijah Newren
2017-12-22 20:38       ` Junio C Hamano
2018-01-08 20:37       ` Junio C Hamano
2018-01-09 18:19         ` [PATCH] merge-recursive: do not look at the index during recursive merge Junio C Hamano
2018-01-09 18:25           ` Junio C Hamano
2018-01-09 18:27           ` Eric Sunshine
2018-01-09 18:29           ` Elijah Newren
2018-01-09 18:49             ` Junio C Hamano

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