Re: "git am --abort" screwing up index?

[Johannes Schindelin <johannes.schindelin@gmx.de>]

Hi Linus,

On 2015-08-17 01:33, Linus Torvalds wrote:
> On Sun, Aug 16, 2015 at 12:46 PM, Linus Torvalds
> <torvalds@linux-foundation.org> wrote:
>>
>> Maybe it has always done this, and I just haven't noticed (I usually
>> _just_ do the "git reset --hard" thing, don't ask me why I wanted to
>> be doubly sure this time). But maybe it's an effect of the new
>> built-in "am".
> 
> I bisected this. It's definitely used to work, and the regression is
> from the new built-in am.

This patch is a reproducer:

-- snipsnap --
From 5323f1c309ad40721e2e19fa9c6ce5ad52d98271 Mon Sep 17 00:00:00 2001
From: Johannes Schindelin <johannes.schindelin@gmx.de>
Date: Mon, 17 Aug 2015 09:37:39 +0200
Subject: [PATCH] t4151: demonstrate that builtin am corrupts index' stat data

Reported by Linus Torvalds.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
---
 t/t4151-am-abort.sh | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/t/t4151-am-abort.sh b/t/t4151-am-abort.sh
index 05bdc3e..bf2e6f4 100755
--- a/t/t4151-am-abort.sh
+++ b/t/t4151-am-abort.sh
@@ -168,4 +168,16 @@ test_expect_success 'am --abort on unborn branch will keep local commits intact'
 	test_cmp expect actual
 '
 
+test_expect_failure 'am --abort leaves index stat info alone' '
+	git checkout -f --orphan stat-info &&
+	git reset &&
+	test_commit should-be-untouched &&
+	test-chmtime =0 should-be-untouched.t &&
+	git update-index --refresh &&
+	git diff-files --exit-code --quiet &&
+	test_must_fail git am 0001-*.patch &&
+	git am --abort &&
+	git diff-files --exit-code --quiet
+'
+
 test_done
-- 
2.3.1.windows.1.9.g8c01ab4