Re: [PATCH 23/33] notes-merge: convert merge_from_diffs to struct object_id

[Stefan Beller]

> @@ -505,16 +505,17 @@ static int merge_changes(struct notes_merge_options *o,
>  }
>
>  static int merge_from_diffs(struct notes_merge_options *o,
> -                           const unsigned char *base,
> -                           const unsigned char *local,
> -                           const unsigned char *remote, struct notes_tree *t)
> +                           const struct object_id *base,
> +                           const struct object_id *local,
> +                           const struct object_id *remote,
> +                           struct notes_tree *t)
>  {
>         struct notes_merge_pair *changes;
>         int num_changes, conflicts;
>
>         trace_printf("\tmerge_from_diffs(base = %.7s, local = %.7s, "
> -              "remote = %.7s)\n", sha1_to_hex(base), sha1_to_hex(local),
> -              sha1_to_hex(remote));
> +              "remote = %.7s)\n", oid_to_hex(base), oid_to_hex(local),
> +              oid_to_hex(remote));

This part is interesting.

7 used to be the default abbreviation length for sha1s (see
e6c587c733 (abbrev: auto size the default abbreviation, 2016-09-30)
for details) and this may have been a left over from the conversion
to variable length abbreviated hashes. This could be a reminder
we want to fix these, too. (Though not in this series?).

Roughly like

    trace_printf("\tmerge_from_diffs(base = %s, local = %s, remote = %s)\n",
        find_unique_abbrev(base.hash, DEFAULT_ABBREV),
        find_unique_abbrev(local.hash, DEFAULT_ABBREV)
        find_unique_abbrev(remote.hash, DEFAULT_ABBREV));