rebase --preserve-merges: ignore "merge.log" config

When "merge.log" config is set, "rebase --preserve-merges" will add
the log lines to the message of the rebased merge commit.  A rebase
should not modify a commit message automatically.

Teach "git-rebase" to ignore that configuration by passing
"--no-log" to the git-merge call.

Signed-off-by: Ralf Thielow <ralf.thielow@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 23 insertions, 0 deletions

diff --git a/t/t3409-rebase-preserve-merges.sh b/t/t3409-rebase-preserve-merges.sh
index 2e0c36415f..8c251c57a6 100755
--- a/t/t3409-rebase-preserve-merges.sh
+++ b/t/t3409-rebase-preserve-merges.sh
@@ -28,6 +28,8 @@ export GIT_AUTHOR_EMAIL
 #     \--A3    <-- topic2
 #      \
 #       B2     <-- origin/topic
+#
+# Clone 4 (same as Clone 3)
 
 test_expect_success 'setup for merge-preserving rebase' \
 	'echo First > A &&
@@ -64,6 +66,16 @@ test_expect_success 'setup for merge-preserving rebase' \
 		git merge --no-ff topic2
 	) &&
 
+	git clone ./. clone4 &&
+	(
+		cd clone4 &&
+		git checkout -b topic2 origin/topic &&
+		echo Sixth > A &&
+		git commit -a -m "Modify A3" &&
+		git checkout -b topic origin/topic &&
+		git merge --no-ff topic2
+	) &&
+
 	git checkout topic &&
 	echo Fourth >> B &&
 	git commit -a -m "Modify B2"
@@ -96,4 +108,15 @@ test_expect_success 'rebase -p preserves no-ff merges' '
 	)
 '
 
+test_expect_success 'rebase -p ignores merge.log config' '
+	(
+	cd clone4 &&
+	git fetch &&
+	git -c merge.log=1 rebase -p origin/topic &&
+	echo >expected &&
+	git log --format="%b" -1 >current &&
+	test_cmp expected current
+	)
+'
+
 test_done