From: Elijah Newren <newren@xxxxxxxxx>
Ever since commit a492d5331c ("merge-ort: ensure we consult df_conflict
and path_conflicts", 2021-06-30), when renormalization is active AND a
file is involved in a rename/delete conflict BUT the file is unmodified
(either before or after renormalization), merge-ort was running into an
assertion failure. Prior to that commit (or if assertions were compiled
out), merge-ort would mis-merge instead, ignoring the rename/delete
conflict and just deleting the file.
Remove the assertions, fix the code appropriately, leave some good
comments in the code, and add a testcase for this situation.
Reported-by: Ralf Thielow <ralf.thielow@xxxxxxxxx>
Signed-off-by: Elijah Newren <newren@xxxxxxxxx>
---
merge-ort: fix bug with renormalization and rename/delete conflicts
Original report:
https://lore.kernel.org/git/CAN0XMOK8iHZnbtYw7CPAQGJcmuVSDxQoFNFEwiaa41V89F1rzA@xxxxxxxxxxxxxx/
Built in v2.34.1, but rebases onto and/or merges cleanly with newer
versions.
Published-As: https://github.com/gitgitgadget/git/releases/tag/pr-git-1174%2Fnewren%2Fmerge-ort-rename-delete-renormalization-bug-v1
Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-git-1174/newren/merge-ort-rename-delete-renormalization-bug-v1
Pull-Request: https://github.com/git/git/pull/1174
merge-ort.c | 19 ++++++++++++++++---
t/t6418-merge-text-auto.sh | 26 ++++++++++++++++++++++++++
2 files changed, 42 insertions(+), 3 deletions(-)
diff --git a/merge-ort.c b/merge-ort.c
index 0342f104836..c3197970219 100644
--- a/merge-ort.c
+++ b/merge-ort.c
@@ -3841,9 +3841,22 @@ static void process_entry(struct merge_options *opt,
if (opt->renormalize &&
blob_unchanged(opt, &ci->stages[0], &ci->stages[side],
path)) {
- ci->merged.is_null = 1;
- ci->merged.clean = 1;
- assert(!ci->df_conflict && !ci->path_conflict);
+ if (!ci->path_conflict) {
+ /*
+ * Blob unchanged after renormalization, so
+ * there's no modify/delete conflict after all;
+ * we can just remove the file.
+ */
+ ci->merged.is_null = 1;
+ ci->merged.clean = 1;
+ /*
+ * file goes away => even if there was a
+ * directory/file conflict there isn't one now.
+ */
+ ci->df_conflict = 0;
+ } else {
+ /* rename/delete, so conflict remains */
+ }
} else if (ci->path_conflict &&
oideq(&ci->stages[0].oid, &ci->stages[side].oid)) {
/*
diff --git a/t/t6418-merge-text-auto.sh b/t/t6418-merge-text-auto.sh
index 1e0296dd172..41288a60ceb 100755
--- a/t/t6418-merge-text-auto.sh
+++ b/t/t6418-merge-text-auto.sh
@@ -204,4 +204,30 @@ test_expect_success 'Test delete/normalize conflict' '
test_path_is_missing file
'
+test_expect_success 'rename/delete vs. renormalization' '
+ git init subrepo &&
+ (
+ cd subrepo &&
+ echo foo >oldfile &&
+ git add oldfile &&
+ git commit -m original &&
+
+ git branch rename &&
+ git branch nuke &&
+
+ git checkout rename &&
+ git mv oldfile newfile &&
+ git commit -m renamed &&
+
+ git checkout nuke &&
+ git rm oldfile &&
+ git commit -m deleted &&
+
+ git checkout rename^0 &&
+ test_must_fail git -c merge.renormalize=true merge nuke >out &&
+
+ grep "rename/delete" out
+ )
+'
+
test_done
base-commit: e9d7761bb94f20acc98824275e317fa82436c25d
--
gitgitgadget
