sequencer: rectify empty hint in call of require_clean_work_tree()

The canonical way to represent "no error hint" is making it NULL, which shortcuts the error() call altogether. This fixes the output by removing the line which said just "error:", which would appear when the worktree is dirtied while editing the initial rebase todo file. This was introduced by 97e1873 (rebase -i: rewrite complete_action() in C, 2018-08-28), which did a somewhat inaccurate conversion from shell. To avoid that such bugs re-appear, test for the condition in require_clean_work_tree(). Signed-off-by: Oswald Buddenhagen <oswald.buddenhagen@gmx.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>

Oswald Buddenhagen committed Aug 24, 2023 at 17:00 UTC a9b5955e07793ceadaad05315c1599226d01292f
2 files changed +6 -2
sequencer.c
+1 -1
@@ -6172,7 +6172,7 @@ int complete_action(struct repository *r, struct replay_opts *opts, unsigned fla
6172 if (checkout_onto(r, opts, onto_name, &oid, orig_head))
6173 goto cleanup;
6174
6175 - if (require_clean_work_tree(r, "rebase", "", 1, 1))
6175 + if (require_clean_work_tree(r, "rebase", NULL, 1, 1))
6176 goto cleanup;
6177
6178 todo_list_write_total_nr(&new_todo);
wt-status.c
+5 -1
@@ -2651,8 +2651,12 @@ int require_clean_work_tree(struct repository *r,
2651 }
2652
2653 if (err) {
2654 - if (hint)
2654 + if (hint) {
2655 + if (!*hint)
2656 + BUG("empty hint passed to require_clean_work_tree();"
2657 + " use NULL instead");
2658 error("%s", hint);
2659 + }
2660 if (!gently)
2661 exit(128);
2662 }