git-subtree: Bail out if we find output from Rust rewrite (test)

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk> Signed-off-by: Junio C Hamano <gitster@pobox.com>

Ian Jackson committed Jul 6, 2026 at 12:58 UTC 20b117c1eb19c0e08ede3c7285c991eac4c9345f
1 file changed +18
contrib/subtree/t/t7900-subtree.sh
+18
@@ -439,6 +439,24 @@ test_expect_success 'split sub dir/ with --rejoin' '
439 )
440 '
441
442 +test_expect_success 'split fail on RIIR git subtree data' '
443 + subtree_test_create_repo "$test_count" &&
444 + subtree_test_create_repo "$test_count/sub proj" &&
445 + test_create_commit "$test_count" main1 &&
446 + test_create_commit "$test_count/sub proj" sub1 &&
447 + (
448 + cd "$test_count" &&
449 + git fetch ./"sub proj" HEAD &&
450 + git subtree add --prefix="sub dir" FETCH_HEAD &&
451 + # simulate RIIR git-subtree generated data
452 + mkdir .git-subtree &&
453 + echo "# sabotage" >.git-subtree/config &&
454 + git add .git-subtree/config &&
455 + git commit -m sabotage &&
456 + test_must_fail git subtree split -P "sub dir" HEAD
457 + )
458 +'
459 +
460 # Tests that commits from other subtrees are not processed as
461 # part of a split.
462 #