revert: Introduce --reset to remove sequencer state

To explicitly remove the sequencer state for a fresh cherry-pick or
revert invocation, introduce a new subcommand called "--reset" to
remove the sequencer state.

Take the opportunity to publicly expose the sequencer paths, and a
generic function called "remove_sequencer_state" that various git
programs can use to remove the sequencer state in a uniform manner;
"git reset" uses it later in this series.  Introducing this public API
is also in line with our long-term goal of eventually factoring out
functions from revert.c into a generic commit sequencer.

Signed-off-by: Ramkumar Ramachandra <artagnon@gmail.com>
Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 13 insertions, 1 deletions

diff --git a/t/t3510-cherry-pick-sequence.sh b/t/t3510-cherry-pick-sequence.sh
index 8ee000180a..fd6986541a 100755
--- a/t/t3510-cherry-pick-sequence.sh
+++ b/t/t3510-cherry-pick-sequence.sh
@@ -13,7 +13,7 @@ test_description='Test cherry-pick continuation features
 . ./test-lib.sh
 
 pristine_detach () {
-	rm -rf .git/sequencer &&
+	git cherry-pick --reset &&
 	git checkout -f "$1^0" &&
 	git read-tree -u --reset HEAD &&
 	git clean -d -f -f -q -x
@@ -70,4 +70,16 @@ test_expect_success 'cherry-pick cleans up sequencer state upon success' '
 	test_path_is_missing .git/sequencer
 '
 
+test_expect_success '--reset does not complain when no cherry-pick is in progress' '
+	pristine_detach initial &&
+	git cherry-pick --reset
+'
+
+test_expect_success '--reset cleans up sequencer state' '
+	pristine_detach initial &&
+	test_must_fail git cherry-pick base..picked &&
+	git cherry-pick --reset &&
+	test_path_is_missing .git/sequencer
+'
+
 test_done