Re: [PATCH] mailmap: only look for .mailmap in work tree

[Jeff King <peff@peff.net>]

On Wed, Feb 10, 2021 at 12:10:02PM -0800, Junio C Hamano wrote:

> >> OK.  Do we know at this point that cwd is always/already at the root
> >> level of the working tree?
> >
> > I think so. If we're in a non-bare repository, we'd have chdir'd during
> > the setup/discovery steps. At any rate, this patch could not possibly be
> > making such a situation _worse_, as we were previously reading it
> > unconditionally.
> 
> But the point of the patch is to ensure that we only read from the
> top of the working tree---I wanted to make sure that we previously
> weren't reading it from any subdirectory the command started.

Ah, I see. I assume that part already worked, or people would be
complaining that "git shortlog" does not work from a subdirectory. :)

It doesn't look like we actually cover that in the test suite, though.
We can do that pretty easily:

diff --git a/t/t4203-mailmap.sh b/t/t4203-mailmap.sh
index bf7a8add53..93caf9a46d 100755
--- a/t/t4203-mailmap.sh
+++ b/t/t4203-mailmap.sh
@@ -923,4 +923,13 @@ test_expect_success 'shortlog on stdin respects mailmap from repo' '
 	test_cmp expect actual
 '
 
+test_expect_success 'find top-level mailmap from subdir' '
+	git clone loc-bare loc-wt &&
+	cp loc-bare/.mailmap loc-wt &&
+	mkdir loc-wt/subdir &&
+	git -C loc-wt/subdir log -1 --format=%aE >actual &&
+	echo new@example.com >expect &&
+	test_cmp expect actual
+'
+
 test_done

I'll resend the whole thing with that squashed in, plus Eric's
documentation suggestion.

-Peff