rebase -i: remove patch file after conflict resolution

When a rebase stops for the user to resolve conflicts it writes a patch
for the conflicting commit to .git/rebase-merge/patch. This file has
been written since the introduction of "git-rebase-interactive.sh" in
1b1dce4bae7 (Teach rebase an interactive mode, 2007-06-25). I assume the
idea was to enable the user inspect the conflicting commit in the same
way as they could for the patch based rebase. This file should be
deleted when the rebase continues as if the rebase stops for a failed
"exec" command or a "break" command it is confusing to the user if there
is a stale patch lying around from an unrelated command. As the path is
now used in two different places rebase_path_patch() is added and used
to obtain the path for the patch.

To construct the path write_patch() previously used get_dir() which
returns different paths depending on whether we're rebasing or
cherry-picking/reverting. As this function is only called when
rebasing it is safe to use a hard coded string for the directory
instead. An assertion is added to make sure we don't starting calling
this function when cherry-picking in the future.

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

1 files changed, 18 insertions, 0 deletions

diff --git a/t/t3418-rebase-continue.sh b/t/t3418-rebase-continue.sh
index 2d0789e554..261e7cd754 100755
--- a/t/t3418-rebase-continue.sh
+++ b/t/t3418-rebase-continue.sh
@@ -244,6 +244,24 @@ test_expect_success 'the todo command "break" works' '
 	test_path_is_file execed
 '
 
+test_expect_success 'patch file is removed before break command' '
+	test_when_finished "git rebase --abort" &&
+	cat >todo <<-\EOF &&
+	pick commit-new-file-F2-on-topic-branch
+	break
+	EOF
+
+	(
+		set_replace_editor todo &&
+		test_must_fail git rebase -i --onto commit-new-file-F2 HEAD
+	) &&
+	test_path_is_file .git/rebase-merge/patch &&
+	echo 22>F2 &&
+	git add F2 &&
+	git rebase --continue &&
+	test_path_is_missing .git/rebase-merge/patch
+'
+
 test_expect_success '--reschedule-failed-exec' '
 	test_when_finished "git rebase --abort" &&
 	test_must_fail git rebase -x false --reschedule-failed-exec HEAD^ &&