recognize loose local objects during repack

[drafnel@gmail.com]

This was developed on top of the previous repack/pack-objects series.


Junio wrote:
> Presumably you meant "exclude objects accessible through alternates,
> either in packs or in loose form"?  If so then I think it is a good thing
> to have.


This patch set looks like what is necessary to exclude loose objects accessible
through alternates from packing.


> I think the useful kinds are only these five:
> 
>  - scoop loose objects that exist in local repository into a new pack,
>    without touching existing packs at all; exclude anything available in
>    any existing pack or in alternate repository (either loose or packed);

  repack -l

>  - pack everything that is needed by the local ref, except the ones that
>    are borrowed from alternate repositories (either loose or packed), into
>    a single new pack.  There are two variants of this: eject what is
>    currently packed but unnecessary into loose format when existing local
>    packs are replaced with the new pack, or lose them (i.e. -A).

  repack -a -l
  repack -A -l

>  - fatten local repository by packing everything that is needed by the
>    local ref into a single new pack, including things that are currently
>    borrowed from alternates.  There are two variants of this: eject what
>    is currently packed but unnecessary into loose format when existing
>    local packs are replaced with the new pack, or lose them (i.e. -A).

  repack -a
  repack -A

-brandon