4 files changed, 124 insertions, 6 deletions

diff --git a/builtin/am.c b/builtin/am.c
index 9f7ecf6ecb..5e866d17c7 100644
--- a/builtin/am.c
+++ b/builtin/am.c
@@ -1598,6 +1598,7 @@ static int fall_back_threeway(const struct am_state *state, const char *index_pa
 	o.branch1 = "HEAD";
 	their_tree_name = xstrfmt("%.*s", linelen(state->msg), state->msg);
 	o.branch2 = their_tree_name;
+	o.detect_directory_renames = 0;
 
 	if (state->quiet)
 		o.verbosity = 0;
diff --git a/merge-recursive.c b/merge-recursive.c
index dcdc93019c..e5243dbc54 100644
--- a/merge-recursive.c
+++ b/merge-recursive.c
@@ -2869,12 +2869,19 @@ static int detect_and_process_renames(struct merge_options *o,
 	head_pairs = get_diffpairs(o, common, head);
 	merge_pairs = get_diffpairs(o, common, merge);
 
-	dir_re_head = get_directory_renames(head_pairs, head);
-	dir_re_merge = get_directory_renames(merge_pairs, merge);
+	if (o->detect_directory_renames) {
+		dir_re_head = get_directory_renames(head_pairs, head);
+		dir_re_merge = get_directory_renames(merge_pairs, merge);
 
-	handle_directory_level_conflicts(o,
-					 dir_re_head, head,
-					 dir_re_merge, merge);
+		handle_directory_level_conflicts(o,
+						 dir_re_head, head,
+						 dir_re_merge, merge);
+	} else {
+		dir_re_head  = xmalloc(sizeof(*dir_re_head));
+		dir_re_merge = xmalloc(sizeof(*dir_re_merge));
+		dir_rename_init(dir_re_head);
+		dir_rename_init(dir_re_merge);
+	}
 
 	ri->head_renames  = get_renames(o, head_pairs,
 					dir_re_merge, dir_re_head, head,
@@ -3586,6 +3593,7 @@ void init_merge_options(struct merge_options *o)
 	o->renormalize = 0;
 	o->diff_detect_rename = -1;
 	o->merge_detect_rename = -1;
+	o->detect_directory_renames = 1;
 	merge_recursive_config(o);
 	merge_verbosity = getenv("GIT_MERGE_VERBOSITY");
 	if (merge_verbosity)
diff --git a/merge-recursive.h b/merge-recursive.h
index 0c46a5a4ff..e6a0828eca 100644
--- a/merge-recursive.h
+++ b/merge-recursive.h
@@ -20,6 +20,7 @@ struct merge_options {
 	unsigned renormalize : 1;
 	long xdl_opts;
 	int verbosity;
+	int detect_directory_renames;
 	int diff_detect_rename;
 	int merge_detect_rename;
 	int diff_rename_limit;
diff --git a/t/t3401-rebase-and-am-rename.sh b/t/t3401-rebase-and-am-rename.sh
index 8f832957fc..e0b5111993 100755
--- a/t/t3401-rebase-and-am-rename.sh
+++ b/t/t3401-rebase-and-am-rename.sh
@@ -5,7 +5,7 @@ test_description='git rebase + directory rename tests'
 . ./test-lib.sh
 . "$TEST_DIRECTORY"/lib-rebase.sh
 
-test_expect_success 'setup testcase' '
+test_expect_success 'setup testcase where directory rename should be detected' '
 	test_create_repo dir-rename &&
 	(
 		cd dir-rename &&
@@ -102,4 +102,112 @@ test_expect_failure 'am: directory rename detected' '
 	)
 '
 
+test_expect_success 'setup testcase where directory rename should NOT be detected' '
+	test_create_repo no-dir-rename &&
+	(
+		cd no-dir-rename &&
+
+		mkdir x &&
+		test_seq  1 10 >x/a &&
+		test_seq 11 20 >x/b &&
+		test_seq 21 30 >x/c &&
+		echo original >project_info &&
+		git add x project_info &&
+		git commit -m "Initial" &&
+
+		git branch O &&
+		git branch A &&
+		git branch B &&
+
+		git checkout A &&
+		echo v2 >project_info &&
+		git add project_info &&
+		git commit -m "Modify project_info" &&
+
+		git checkout B &&
+		mkdir y &&
+		git mv x/c y/c &&
+		echo v1 >project_info &&
+		git add project_info &&
+		git commit -m "Rename x/c to y/c, modify project_info"
+	)
+'
+
+test_expect_success 'rebase --interactive: NO directory rename' '
+	test_when_finished "git -C no-dir-rename rebase --abort" &&
+	(
+		cd no-dir-rename &&
+
+		git checkout B^0 &&
+
+		set_fake_editor &&
+		test_must_fail env FAKE_LINES="1" git rebase --interactive A &&
+
+		git ls-files -s >out &&
+		test_line_count = 6 out &&
+
+		test_path_is_file x/a &&
+		test_path_is_file x/b &&
+		test_path_is_missing x/c
+	)
+'
+
+test_expect_success 'rebase (am): NO directory rename' '
+	test_when_finished "git -C no-dir-rename rebase --abort" &&
+	(
+		cd no-dir-rename &&
+
+		git checkout B^0 &&
+
+		set_fake_editor &&
+		test_must_fail git rebase A &&
+
+		git ls-files -s >out &&
+		test_line_count = 6 out &&
+
+		test_path_is_file x/a &&
+		test_path_is_file x/b &&
+		test_path_is_missing x/c
+	)
+'
+
+test_expect_success 'rebase --merge: NO directory rename' '
+	test_when_finished "git -C no-dir-rename rebase --abort" &&
+	(
+		cd no-dir-rename &&
+
+		git checkout B^0 &&
+
+		set_fake_editor &&
+		test_must_fail git rebase --merge A &&
+
+		git ls-files -s >out &&
+		test_line_count = 6 out &&
+
+		test_path_is_file x/a &&
+		test_path_is_file x/b &&
+		test_path_is_missing x/c
+	)
+'
+
+test_expect_success 'am: NO directory rename' '
+	test_when_finished "git -C no-dir-rename am --abort" &&
+	(
+		cd no-dir-rename &&
+
+		git checkout A^0 &&
+
+		git format-patch -1 B &&
+
+		test_must_fail git am --3way 0001*.patch &&
+
+		git ls-files -s >out &&
+		test_line_count = 6 out &&
+
+		test_path_is_file x/a &&
+		test_path_is_file x/b &&
+		test_path_is_missing x/c
+	)
+'
+
 test_done