rebase: help users when dying with `preserve-merges`

Git would die if a "rebase --preserve-merges" was in progress. Users could neither --quit, --abort, nor --continue the rebase. Make the `rebase --abort` option available to allow users to remove traces of any preserve-merges rebase, even if they had upgraded during a rebase. One trigger case was an unexpectedly difficult to resolve conflict, as reported on the `git-users` group. (https://groups.google.com/g/git-for-windows/c/3jMWbBlXXHM) Other potential use-cases include git-experts using the portable 'Git on a stick' to help users with an older git version. Signed-off-by: Philip Oakley <philipoakley@iee.email> Signed-off-by: Junio C Hamano <gitster@pobox.com>

Philip Oakley committed Jun 4, 2022 at 11:17 UTC afd58a0d42b5385089799fdd66b555df7cc8a4b4
1 file changed +4 -2
builtin/rebase.c
+4 -2
index 7c1b9bd9b9..a3bae89f64 100644 --- a/builtin/rebase.c +++ b/builtin/rebase.c @@ -1182,8 +1182,10 @@ int cmd_rebase(int argc, const char **argv, const char *prefix) } else if (is_directory(merge_dir())) { strbuf_reset(&buf); strbuf_addf(&buf, "%s/rewritten", merge_dir()); - if (is_directory(buf.buf)) { - die("`rebase -p` is no longer supported"); + if (!(action == ACTION_ABORT) && is_directory(buf.buf)) { + die("`rebase --preserve-merges` (-p) is no longer supported.\n" + "Use `git rebase --abort` to terminate current rebase.\n" + "Or downgrade to v2.33, or earlier, to complete the rebase."); } else { strbuf_reset(&buf); strbuf_addf(&buf, "%s/interactive", merge_dir());