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Re: Avoiding the three-windows merging with Git

From: Kévin Le Gouguec
Subject: Re: Avoiding the three-windows merging with Git
Date: Tue, 26 Nov 2019 08:16:53 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (gnu/linux)

Richard Stallman <address@hidden> writes:

> I don't know how to provoke a conflict intentionally.
> I'd have to ask someone to install a patch that conflicts
> with something I want to install.  However, doing that in
> a Git repo where it will be impossible to remove later
> seems like a bad idea.
> Can someone help me create a conflict to test handling it?

Attachment: create-conflict.sh
Description: Text Data

Attached is a silly script to create a conflict on a temporary
repository.  The script creates 3 folders in the current directory:

- hacker-repo: the folder where one hacker is working,
- hacker2-repo: the folder where another hacker is working,
- server-hosted-repo: the "central repository" where both hackers
  update from and commit to.

The script runs the following operations:

- create the central repository,
- make the first hacker commit a one-line file,
- make the second hacker update this file and commit the changes,
- make the first hacker update the file without updating from the
  central repository first.

(Some of these operations could probably have been expressed in terms
of vc commands; apologies for not taking the time to do so.)

>From there one can start emacs -Q to observe the conflict:

$ emacs -Q hacker-repo
C-x v +

That gets me a log buffer from vc saying:

> Running "git pull --stat"...
> From ../server-hosted-repo
>  * branch            master     -> FETCH_HEAD
> Auto-merging README
> CONFLICT (content): Merge conflict in README
> Automatic merge failed; fix conflicts and then commit the result.

And indeed, visiting the README, I see conflict markers, and the
Smerge minor mode enabled (see attached screenshot).

C-h b tells me that C-c ^ E runs smerge-ediff, which spawns Ediff's
3-window merge UI.

Attachment: vc-update-conflict.png
Description: PNG image

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