Re: [PATCH 40/49] builtin/repack.c: introduce `struct write_pack_opts`

> Instead of repeating those arguments for each function, let's extract an
> options struct called "write_pack_opts" which has these three parameters
> as member fields. While we're at it, add fields for "packdir," and
> "packtmp", both of which are static variables within the builtin, and
> need to be read from within these two functions.

> +		struct write_pack_opts opts = {
> +			.po_args = &po_args,
> +			.destination = filter_to,
> +			.pack_prefix = find_pack_prefix(packdir, packtmp),
> +			.packdir = packdir,
> +			.packtmp = packtmp,
> +		};