1 files changed, 103 insertions, 0 deletions
diff --git a/t/t6411-merge-filemode.sh b/t/t6411-merge-filemode.sh
new file mode 100755
index 0000000000..f54c915d6a
--- /dev/null
+++ b/t/t6411-merge-filemode.sh
@@ -0,0 +1,103 @@
+#!/bin/sh
+
+test_description='merge: handle file mode'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+. ./test-lib.sh
+
+test_expect_success 'set up mode change in one branch' '
+	: >file1 &&
+	git add file1 &&
+	git commit -m initial &&
+	git checkout -b a1 main &&
+	: >dummy &&
+	git add dummy &&
+	git commit -m a &&
+	git checkout -b b1 main &&
+	test_chmod +x file1 &&
+	git add file1 &&
+	git commit -m b1
+'
+
+do_one_mode () {
+	strategy=$1
+	us=$2
+	them=$3
+	test_expect_success "resolve single mode change ($strategy, $us)" '
+		git checkout -f $us &&
+		git merge -s $strategy $them &&
+		git ls-files -s file1 | grep ^100755
+	'
+
+	test_expect_success FILEMODE "verify executable bit on file ($strategy, $us)" '
+		test -x file1
+	'
+}
+
+do_one_mode recursive a1 b1
+do_one_mode recursive b1 a1
+do_one_mode resolve a1 b1
+do_one_mode resolve b1 a1
+
+test_expect_success 'set up mode change in both branches' '
+	git reset --hard HEAD &&
+	git checkout -b a2 main &&
+	: >file2 &&
+	H=$(git hash-object file2) &&
+	test_chmod +x file2 &&
+	git commit -m a2 &&
+	git checkout -b b2 main &&
+	: >file2 &&
+	git add file2 &&
+	git commit -m b2 &&
+	{
+		echo "100755 $H 2	file2"
+		echo "100644 $H 3	file2"
+	} >expect
+'
+
+do_both_modes () {
+	strategy=$1
+	test_expect_success "detect conflict on double mode change ($strategy)" '
+		git reset --hard &&
+		git checkout -f a2 &&
+		test_must_fail git merge -s $strategy b2 &&
+		git ls-files -u >actual &&
+		test_cmp expect actual &&
+		git ls-files -s file2 | grep ^100755
+	'
+
+	test_expect_success FILEMODE "verify executable bit on file ($strategy)" '
+		test -x file2
+	'
+}
+
+# both sides are equivalent, so no need to run both ways
+do_both_modes recursive
+do_both_modes resolve
+
+test_expect_success 'set up delete/modechange scenario' '
+	git reset --hard &&
+	git checkout -b deletion main &&
+	git rm file1 &&
+	git commit -m deletion
+'
+
+do_delete_modechange () {
+	strategy=$1
+	us=$2
+	them=$3
+	test_expect_success "detect delete/modechange conflict ($strategy, $us)" '
+		git reset --hard &&
+		git checkout $us &&
+		test_must_fail git merge -s $strategy $them
+	'
+}
+
+do_delete_modechange recursive b1 deletion
+do_delete_modechange recursive deletion b1
+do_delete_modechange resolve b1 deletion
+do_delete_modechange resolve deletion b1
+
+test_done