sequencer: future-proof remove_sequencer_state()

In a couple of commits, we will teach the sequencer to handle the
nitty gritty of the interactive rebase, which keeps its state in a
different directory.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

Author: dscho

sequencer.c

@@ -27,6 +27,11 @@ static GIT_PATH_FUNC(git_path_todo_file, "sequencer/todo")
 static GIT_PATH_FUNC(git_path_opts_file, "sequencer/opts")
 static GIT_PATH_FUNC(git_path_head_file, "sequencer/head")
 
+static const char *get_dir(const struct replay_opts *opts)
+{
+	return git_path_seq_dir();
+}
+
 static int is_rfc2822_line(const char *buf, int len)
 {
 	int i;
@@ -109,13 +114,13 @@ static int has_conforming_footer(struct strbuf *sb, struct strbuf *sob,
 	return 1;
 }
 
-static void remove_sequencer_state(void)
+static void remove_sequencer_state(const struct replay_opts *opts)
 {
-	struct strbuf seq_dir = STRBUF_INIT;
+	struct strbuf dir = STRBUF_INIT;
 
-	strbuf_addf(&seq_dir, "%s", git_path_seq_dir());
-	remove_dir_recursively(&seq_dir, 0);
-	strbuf_release(&seq_dir);
+	strbuf_addf(&dir, "%s", get_dir(opts));
+	remove_dir_recursively(&dir, 0);
+	strbuf_release(&dir);
 }
 
 static const char *action_name(const struct replay_opts *opts)
@@ -909,7 +914,7 @@ static int sequencer_rollback(struct replay_opts *opts)
 	}
 	if (reset_for_rollback(sha1))
 		goto fail;
-	remove_sequencer_state();
+	remove_sequencer_state(opts);
 	strbuf_release(&buf);
 	return 0;
 fail:
@@ -998,7 +1003,7 @@ static int pick_commits(struct commit_list *todo_list, struct replay_opts *opts)
 	 * Sequence of picks finished successfully; cleanup by
 	 * removing the .git/sequencer directory
 	 */
-	remove_sequencer_state();
+	remove_sequencer_state(opts);
 	return 0;
 }
 
@@ -1059,7 +1064,7 @@ int sequencer_pick_revisions(struct replay_opts *opts)
 	 * one that is being continued
 	 */
 	if (opts->subcommand == REPLAY_REMOVE_STATE) {
-		remove_sequencer_state();
+		remove_sequencer_state(opts);
 		return 0;
 	}
 	if (opts->subcommand == REPLAY_ROLLBACK)