Re: [PATCH 08/19] loose: write loose objects map via their source

> When a repository is configured to have a compatibility hash algorithm
> we keep track of object ID mappings for loose objects via the loose
> object map. This map simply maps an object ID of the actual hash to the
> object ID of the compatibility hash. This loose object map is an
> inherent property of the loose files backend and thus of one specific
> object source.
>
> Refactor the interfaces to reflect this by requiring a `struct
> odb_source` as input instead of a repository. This prepares for
> subsequent commits where we will refactor writing of loose objects to
> work on a `struct odb_source`, as well.
>
> Signed-off-by: Patrick Steinhardt <ps@pks.im>
> ---
>  loose.c       | 16 +++++++++-------
>  loose.h       |  4 +++-
>  object-file.c |  6 +++---
>  3 files changed, 15 insertions(+), 11 deletions(-)
>
> diff --git a/loose.c b/loose.c
> index 519f5db7935..e8ea6e7e24b 100644
> --- a/loose.c
> +++ b/loose.c
> @@ -166,7 +166,8 @@ int repo_write_loose_object_map(struct repository *repo)
>  	return -1;
>  }
>
> -static int write_one_object(struct repository *repo, const struct object_id *oid,
> +static int write_one_object(struct odb_source *source,