[PATCH 1/2] sequencer: clear CHERRY_PICK_HEAD upon dropping a become-empty commit

["Elijah Newren via GitGitGadget" <gitgitgadget@gmail.com>]

From: Elijah Newren <newren@gmail.com>

In commit e98c4269c8 ("rebase (interactive-backend): fix handling of
commits that become empty", 2020-02-15), the merge backend was changed
to drop commits that did not start empty but became so after being
applied (because their changes were a subset of what was already
upstream).  This new code path did not need to go through the process of
creating a commit, since we were dropping the commit instead.
Unfortunately, this also means we bypassed the clearing of the
CHERRY_PICK_HEAD file, which if there were no further commits to
cherry-pick would mean that the rebase would end but assume there was
still an operation in progress.  Ensure that we clear CHERRY_PICK_HEAD
when we decide to drop the commit.

Signed-off-by: Elijah Newren <newren@gmail.com>
---
 sequencer.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/sequencer.c b/sequencer.c
index 7477b15422a..8b4e0200c5f 100644
--- a/sequencer.c
+++ b/sequencer.c
@@ -1957,6 +1957,7 @@ static int do_pick_commit(struct repository *r,
 		flags |= ALLOW_EMPTY;
 	} else if (allow == 2) {
 		drop_commit = 1;
+		unlink(git_path_cherry_pick_head(r));
 		fprintf(stderr,
 			_("dropping %s %s -- patch contents already upstream\n"),
 			oid_to_hex(&commit->object.oid), msg.subject);
-- 
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