[PATCH] rebase --abort: cleanup refs/rewritten

[Phillip Wood <phillip.wood123@gmail.com>]

From: Phillip Wood <phillip.wood@dunelm.org.uk>

When `rebase -r` finishes it removes any refs under refs/rewritten
that it has created. However if the rebase is aborted these 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.

Signed-off-by: Phillip Wood <phillip.wood@dunelm.org.uk>
---

Notes:
    This is based on pw/rebase-i-internal, it would be nicer to base it on
    maint but there are function name clashes adding sequencer.h to rebase.c
    an maint. Those clashes are fixed in pw/rebase-i-internal

 builtin/rebase.c         | 13 ++++++++++---
 t/t3430-rebase-merges.sh |  8 ++++++++
 2 files changed, 18 insertions(+), 3 deletions(-)

diff --git a/builtin/rebase.c b/builtin/rebase.c
index 82bd50a1b4..e2e49c8239 100644
--- a/builtin/rebase.c
+++ b/builtin/rebase.c
@@ -761,9 +761,16 @@ static int finish_rebase(struct rebase_options *opts)
 	 * user should see them.
 	 */
 	run_command_v_opt(argv_gc_auto, RUN_GIT_CMD);
-	strbuf_addstr(&dir, opts->state_dir);
-	remove_dir_recursively(&dir, 0);
-	strbuf_release(&dir);
+	if (opts->type == REBASE_INTERACTIVE) {
+		struct replay_opts replay = REPLAY_OPTS_INIT;
+
+		replay.action = REPLAY_INTERACTIVE_REBASE;
+		sequencer_remove_state(&replay);
+	} else {
+		strbuf_addstr(&dir, opts->state_dir);
+		remove_dir_recursively(&dir, 0);
+		strbuf_release(&dir);
+	}
 
 	return 0;
 }
diff --git a/t/t3430-rebase-merges.sh b/t/t3430-rebase-merges.sh
index 4c69255ee6..6ebebf7098 100755
--- a/t/t3430-rebase-merges.sh
+++ b/t/t3430-rebase-merges.sh
@@ -224,6 +224,14 @@ 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 'post-rewrite hook and fixups work for merges' '
 	git checkout -b post-rewrite &&
 	test_commit same1 &&
-- 
2.21.0