Re: [PATCH v6 10/11] cache-tree: allow writing in-memory index as tree

>
> The function `write_in_core_index_as_tree()` takes a repository and
> writes its index into a tree object. What this function cannot do though
> is to take an _arbitrary_ in-memory index.
>
> Introduce a new `struct index_state` parameter so that the caller can
> pass a different index than the one belonging to the repository. This
> will be used in a subsequent commit.

> Signed-off-by: Patrick Steinhardt <ps@pks.im>
> ---
>  builtin/checkout.c | 3 ++-
>  cache-tree.c       | 5 ++---
>  cache-tree.h       | 3 ++-
>  3 files changed, 6 insertions(+), 5 deletions(-)
>
> diff --git a/builtin/checkout.c b/builtin/checkout.c
> index d230b1f8995..0b90f398feb 100644
> --- a/builtin/checkout.c
> +++ b/builtin/checkout.c
> @@ -902,7 +902,8 @@ static int merge_working_tree(const struct checkout_opts *opts,
>                                            0);
>                         init_ui_merge_options(&o, the_repository);
>                         o.verbosity = 0;
> -                       work = write_in_core_index_as_tree(the_repository);
> +                       work = write_in_core_index_as_tree(the_repository,
> +                                                          the_repository->index);
>
>                         ret = reset_tree(new_tree,
>                                          opts, 1,
> diff --git a/cache-tree.c b/cache-tree.c
> index 2aba47060e9..b67d0d703d2 100644
> --- a/cache-tree.c
> +++ b/cache-tree.c
> @@ -699,11 +699,11 @@ static int write_index_as_tree_internal(struct object_id *oid,
>         return 0;
>  }
>
> -struct tree* write_in_core_index_as_tree(struct repository *repo) {
> +struct tree *write_in_core_index_as_tree(struct repository *repo,
> +                                        struct index_state *index_state) {
>         struct object_id o;
>         int was_valid, ret;
>
> -       struct index_state *index_state = repo->index;
>         was_valid = index_state->cache_tree &&
>                     cache_tree_fully_valid(index_state->cache_tree);
>
> @@ -723,7 +723,6 @@ struct tree* write_in_core_index_as_tree(struct repository *repo) {
>         return lookup_tree(repo, &index_state->cache_tree->oid);
>  }
>
> -

>  int write_index_as_tree(struct object_id *oid, struct index_state *index_state, const char *index_path, int flags, const char *prefix)
>  {
>         int entries, was_valid;
> diff --git a/cache-tree.h b/cache-tree.h
> index b82c4963e7c..f8bddae5235 100644
> --- a/cache-tree.h
> +++ b/cache-tree.h
> @@ -47,7 +47,8 @@ int cache_tree_verify(struct repository *, struct index_state *);
>  #define WRITE_TREE_UNMERGED_INDEX (-2)
>  #define WRITE_TREE_PREFIX_ERROR (-3)
>
> -struct tree* write_in_core_index_as_tree(struct repository *repo);
> +struct tree *write_in_core_index_as_tree(struct repository *repo,
> +                                        struct index_state *index_state);
>  int write_index_as_tree(struct object_id *oid, struct index_state *index_state, const char *index_path, int flags, const char *prefix);
>  void prime_cache_tree(struct repository *, struct index_state *, struct tree *);
>
>
> --
> 2.51.1.930.gacf6e81ea2.dirty