Re: Re* [PATCH v2] fixup! mergetool: add automerge configuration

[Seth House <seth@eseth.com>]

On Sun, Jan 10, 2021 at 03:24:48AM -0800, Junio C Hamano wrote:
> Note that with t7800 fixed with the patch, non Windows jobs all seem
> to pass, but t7610 seems to have problem(s) on Windows.

The autocrlf test is breaking because the sed that ships with some mingw
versions (and also some minsys and cygwin versions) will *automatically*
remove carriage returns:

$ printf 'foo\r\nbar\r\n' | sed -e '/bar/d' | cat -A
foo$

$ printf 'foo\r\nbar\r\n' | sed -b -e '/bar/d' | cat -A
foo^M$

(Note: the -b flag above is just for comparison. We can't use it here.
It's not in POSIX and is not present in sed for busybox or OSX.)

I haven't found official docs that describe this behavior yet but
I found a few discussions about it across a few lists. E.g.:
https://cygwin.com/pipermail/cygwin/2017-June/233121.html

Suggestions welcome.

Obviously we could try to detect crlf's before the sed and then try to
re-add them back in after sed but that strikes me as error-prone.

I recall someone mentioning calling merge-file twice, once with --ours
and once with --theirs, to independently generate each "side" of the
conflict instead of using sed to split MERGED. Is that a viable
approach?