Re: [PATCH 09/19] odb: introduce `odb_write_object()`

> We do not have a backend-agnostic way to write objects into an object
> database. While there is `write_object_file()`, this function is rather
> specific to the loose object format.
>
> Introduce `odb_write_object()` to plug this gap. For now, this function
> is a simple wrapper around `write_object_file()` and doesn't even use
> the passed-in object database yet. This will change in subsequent
> commits, where `write_object_file()` is converted so that it works on
> top of an `odb_source`. `odb_write_object()` will then become
> responsible for deciding which source an object shall be written to.
>
> Signed-off-by: Patrick Steinhardt <ps@pks.im>
> ---
>  apply.c                  | 11 +++++++----
>  builtin/checkout.c       |  2 +-
>  builtin/merge-file.c     |  3 ++-
>  builtin/mktag.c          |  2 +-
>  builtin/mktree.c         |  2 +-
>  builtin/notes.c          |  3 ++-
>  builtin/receive-pack.c   |  4 ++--
>  builtin/replace.c        |  3 ++-
>  builtin/tag.c            |  4 ++--
>  builtin/unpack-objects.c | 12 ++++++------
>  cache-tree.c             |  5 ++---
>  commit.c                 |  4 ++--
>  match-trees.c            |  2 +-
>  merge-ort.c              |  7 ++++---
>  notes-cache.c            |  3 ++-
>  notes.c                  | 12 ++++++++----
>  object-file.c            | 18 +++++++++---------
>  object-file.h            | 26 +++-----------------------
>  odb.c                    | 10 ++++++++++
>  odb.h                    | 38 ++++++++++++++++++++++++++++++++++++++
>  read-cache.c             |  2 +-
>  21 files changed, 106 insertions(+), 67 deletions(-)
>

> diff --git a/odb.h b/odb.h
> index e922f256802..c96d2c29e9f 100644
> --- a/odb.h
> +++ b/odb.h
> @@ -437,6 +437,44 @@ enum for_each_object_flags {
>  	FOR_EACH_OBJECT_SKIP_ON_DISK_KEPT_PACKS = (1<<4),
>  };
>  
> +enum {
> +	/*
> +	 * By default, `odb_write_object()` does not actually write anything
> +	 * into the object store, but only computes the object ID. This flag
> +	 * changes that so that the object will be written as a loose object
> +	 * and persisted.
> +	 */
> +	WRITE_OBJECT_PERSIST = (1 << 0),
> +
> +	/*
> +	 * Do not print an error in case something gose wrong.