diff mbox series

[2/3] merge-ort: ensure we consult df_conflict and path_conflicts

Message ID 052f40c3c1a6b35f9253faf698f8cbc87f81675e.1624727121.git.gitgitgadget@gmail.com (mailing list archive)
State New, archived
Headers show
Series Fix bugs from interesting renaming pairs: one side renames A/file -> B/file, the other B/ -> A/ | expand

Commit Message

Elijah Newren June 26, 2021, 5:05 p.m. UTC 
From: Elijah Newren <newren@gmail.com>

Path conflicts (typically rename path conflicts, e.g.
rename/rename(1to2) or rename/add/delete), and directory/file conflicts
should obviously result in files not being marked as clean in the merge.
We had a codepath where we missed consulting the path_conflict and
df_conflict flags, based on match_mask.  Granted, it requires an unusual
setup to trigger this codepath (directory rename causing rename-to-self
is the only case I can think of), but we still need to handle it.  To
make it clear that we have audited the other codepaths that do not
explicitly mention these flags, add some assertions that the flags are
not set.

Reported-by: Anders Kaseorg <andersk@mit.edu>
Signed-off-by: Elijah Newren <newren@gmail.com>
---
 merge-ort.c                         | 6 +++++-
 t/t6423-merge-rename-directories.sh | 4 ++--
 2 files changed, 7 insertions(+), 3 deletions(-)
diff mbox series

Patch

diff --git a/merge-ort.c b/merge-ort.c
index b954f7184a5..373dbac5079 100644
--- a/merge-ort.c
+++ b/merge-ort.c
@@ -3237,7 +3237,7 @@  static void process_entry(struct merge_options *opt,
 	 *       above.
 	 */
 	if (ci->match_mask) {
-		ci->merged.clean = 1;
+		ci->merged.clean = !ci->df_conflict && !ci->path_conflict;
 		if (ci->match_mask == 6) {
 			/* stages[1] == stages[2] */
 			ci->merged.result.mode = ci->stages[1].mode;
@@ -3249,6 +3249,8 @@  static void process_entry(struct merge_options *opt,
 
 			ci->merged.result.mode = ci->stages[side].mode;
 			ci->merged.is_null = !ci->merged.result.mode;
+			if (ci->merged.is_null)
+				ci->merged.clean = 1;
 			oidcpy(&ci->merged.result.oid, &ci->stages[side].oid);
 
 			assert(othermask == 2 || othermask == 4);
@@ -3421,6 +3423,7 @@  static void process_entry(struct merge_options *opt,
 				   path)) {
 			ci->merged.is_null = 1;
 			ci->merged.clean = 1;
+			assert(!ci->df_conflict && !ci->path_conflict);
 		} else if (ci->path_conflict &&
 			   oideq(&ci->stages[0].oid, &ci->stages[side].oid)) {
 			/*
@@ -3447,6 +3450,7 @@  static void process_entry(struct merge_options *opt,
 		ci->merged.is_null = 1;
 		ci->merged.result.mode = 0;
 		oidcpy(&ci->merged.result.oid, null_oid());
+		assert(!ci->df_conflict);
 		ci->merged.clean = !ci->path_conflict;
 	}
 
diff --git a/t/t6423-merge-rename-directories.sh b/t/t6423-merge-rename-directories.sh
index 2a2ab907338..7480daab46a 100755
--- a/t/t6423-merge-rename-directories.sh
+++ b/t/t6423-merge-rename-directories.sh
@@ -5058,7 +5058,7 @@  test_setup_12i () {
 	)
 }
 
-test_expect_merge_algorithm failure failure '12i: Directory rename causes rename-to-self' '
+test_expect_merge_algorithm failure success '12i: Directory rename causes rename-to-self' '
 	test_setup_12i &&
 	(
 		cd 12i &&
@@ -5116,7 +5116,7 @@  test_setup_12j () {
 	)
 }
 
-test_expect_merge_algorithm failure failure '12j: Directory rename to root causes rename-to-self' '
+test_expect_merge_algorithm failure success '12j: Directory rename to root causes rename-to-self' '
 	test_setup_12j &&
 	(
 		cd 12j &&