Re: [PATCH v4 3/8] rebase: be stricter when reading state files containing oids

> diff --git a/commit.c b/commit.c
> index 0db461f9735..de30b098dd3 100644
> --- a/commit.c
> +++ b/commit.c
> @@ -59,6 +59,14 @@ struct commit *lookup_commit_or_die(const struct object_id *oid, const char *ref
>  	return c;
>  }
>  
> +struct commit *lookup_commit_object (struct repository *r,
> +				     const struct object_id *oid)

> +{
> +	struct object *obj = parse_object(r, oid);
> +	return obj ? object_as_type(obj, OBJ_COMMIT, 0) : NULL;
> +
> +}
> +
>  struct commit *lookup_commit(struct repository *r, const struct object_id *oid)
>  {
>  	struct object *obj = lookup_object(r, oid);
> diff --git a/commit.h b/commit.h
> index 21e4d25ce78..fa39202fa6b 100644
> --- a/commit.h
> +++ b/commit.h
> @@ -64,6 +64,19 @@ enum decoration_type {
>  void add_name_decoration(enum decoration_type type, const char *name, struct object *obj);
>  const struct name_decoration *get_name_decoration(const struct object *obj);
>  
> +/*
> + * Look up commit named by "oid" respecting replacement objects.
> + * Returns NULL if "oid" is not a commit or does not exist.
> + */
> +struct commit *lookup_commit_object(struct repository *r, const struct object_id *oid);
> +
> +/*
> + * Look up commit named by "oid" without replacement objects or
> + * checking for object existence. Returns the requested commit if it
> + * is found in the object cache, NULL if "oid" is in the object cache
> + * but is not a commit and a newly allocated unparsed commit object if
> + * "oid" is not in the object cache.
> + */
>  struct commit *lookup_commit(struct repository *r, const struct object_id *oid);