> @@ -1237,7 +1253,7 @@ static int write_midx_internal(const char *object_dir,
>
> QSORT(ctx.info, ctx.nr, pack_info_compare);
>
> - if (packs_to_drop && packs_to_drop->nr) {
> + if (ctx.m && packs_to_drop && packs_to_drop->nr) {
> int drop_index = 0;
> int missing_drops = 0;
>
I couldn't figure out why this requires ctx.m now.
> @@ -62,6 +63,10 @@ int midx_contains_pack(struct multi_pack_index *m, const char *idx_or_pack_name)
> int prepare_multi_pack_index_one(struct repository *r, const char *object_dir, int local);
>
> int write_midx_file(const char *object_dir, const char *preferred_pack_name, unsigned flags);
> +int write_midx_file_only(const char *object_dir,
> + struct string_list *packs_to_include,
> + const char *preferred_pack_name,
> + unsigned flags);
It took me a while to figure out that this function doesn't only write a
MIDX file, but writes an MIDX file only for certain packs. Maybe worth
adding a comment here (e.g. "Write an MIDX file only for the given
packs").
Other than that, this patch looks good.
