@matheusbsbs / matheus-bagliano / commits / d30126c20d

merge-ort: fix bug with renormalization and rename/delete conflicts

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@gmail.com> Signed-off-by: Elijah Newren <newren@gmail.com> Reviewed-by: Derrick Stolee <dstolee@microsoft.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>

Elijah Newren committed Dec 28, 2021 at 00:20 UTC d30126c20d5899f128facbd33ecf27163efe1326
2 files changed +42 -3
merge-ort.c
+16 -3
index 0342f10483..c319797021 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)) { /*
t/t6418-merge-text-auto.sh
+26
index 1e0296dd17..41288a60ce 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