rebase --abort/--quit: cleanup refs/rewritten

When `rebase -r` finishes it removes any refs under refs/rewritten that
it has created. However if the user aborts or quits the rebase refs are
not removed. This can cause problems for future rebases. For example I
recently wanted to merge a updated version of a topic branch into an
integration branch so ran `rebase -ir` and removed the picks and label
for the topic branch from the todo list so that

    merge -C <old-merge> topic

would pick up the new version of topic. Unfortunately
refs/rewritten/topic already existed from a previous rebase that had
been aborted so the rebase just used the old topic, not the new one.

The logic for the non-interactive quit case is changed to ensure
`buf` is always freed.

Signed-off-by: Phillip Wood <phillip.wood@dunelm.org.uk>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 17 insertions, 1 deletions

diff --git a/t/t3430-rebase-merges.sh b/t/t3430-rebase-merges.sh
index 4c69255..e63576d 100755
--- a/t/t3430-rebase-merges.sh
+++ b/t/t3430-rebase-merges.sh
@@ -224,8 +224,24 @@ test_expect_success 'refs/rewritten/* is worktree-local' '
 	test_cmp_rev HEAD "$(cat wt/b)"
 '
 
+test_expect_success '--abort cleans up refs/rewritten' '
+	git checkout -b abort-cleans-refs-rewritten H &&
+	GIT_SEQUENCE_EDITOR="echo break >>" git rebase -ir @^ &&
+	git rev-parse --verify refs/rewritten/onto &&
+	git rebase --abort &&
+	test_must_fail git rev-parse --verify refs/rewritten/onto
+'
+
+test_expect_success '--quit cleans up refs/rewritten' '
+	git checkout -b quit-cleans-refs-rewritten H &&
+	GIT_SEQUENCE_EDITOR="echo break >>" git rebase -ir @^ &&
+	git rev-parse --verify refs/rewritten/onto &&
+	git rebase --quit &&
+	test_must_fail git rev-parse --verify refs/rewritten/onto
+'
+
 test_expect_success 'post-rewrite hook and fixups work for merges' '
-	git checkout -b post-rewrite &&
+	git checkout -b post-rewrite H &&
 	test_commit same1 &&
 	git reset --hard HEAD^ &&
 	test_commit same2 &&