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Re: nd/merge-quit, was Re: What's cooking in git.git (May 2019, #01; Thu, 9)

On Fri, May 10, 2019 at 3:54 AM Johannes Schindelin
<Johannes.Schindelin@xxxxxx> wrote:
> Hi Junio & Duy,
> On Thu, 9 May 2019, Junio C Hamano wrote:
> > * nd/merge-quit (2019-05-07) 2 commits
> >  - merge: add --quit
> >  - merge: remove drop_save() in favor of remove_merge_branch_state()
> >
> >  "git merge" learned "--quit" option that cleans up the in-progress
> >  merge while leaving the working tree and the index still in a mess.
> >
> >  Hmph, why is this a good idea?
> It also seems to work *only* on Linux. At least the tests break on macOS
> and on Windows:
> https://dev.azure.com/gitgitgadget/git/_build/results?buildId=8313&view=ms.vss-test-web.build-test-results-tab

Sorry I have no idea what the problem is. That's basically the same as
the 'merge detects mod-256 conflicts (recursive)' test earlier but
with rerere enabled. It does not even look like some leftover rerere
records accidentally fix the conflict.

I tried with a case-insensitive filesytem (on linux) and with
--valgrind, no problem found. Travis on pu seemed ok with t7600 on

One difference I notice is the the failed test looks like it found the
wrong merge base

found 1 common ancestor:
c4c4222 commit 1

while my tests have "commit 0" as the base. "git log --graph
--oneline" indicates "commit 1" is the wrong base.

Something is wrong with the merge code (this has not even reached the
new --quit code). I could change the setup steps to be more stable,
using a simpler commit history, but this looks like something we
should find and fix.

> Sadly, I ran out of time do look into this (I am pretty busy preparing Git
> for Windows for v2.22.0-rc0).
> Ciao,
> Dscho