On 09/29/2015 12:02 AM, David Turner wrote:
> The file backend doesn't need this function, but other backends might.
>
> Signed-off-by: David Turner <dtur...@twopensource.com>
> Signed-off-by: Ronnie Sahlberg <rsahlb...@google.com>
> ---
> refs-be-files.c | 1 +
> refs.c | 4 +++-
> refs.h | 4 +++-
> 3 files changed, 7 insertions(+), 2 deletions(-)
>
> diff --git a/refs-be-files.c b/refs-be-files.c
> index 37e244a..eaa74b6 100644
> --- a/refs-be-files.c
> +++ b/refs-be-files.c
> @@ -3737,6 +3737,7 @@ int reflog_expire(const char *refname, const unsigned
> char *sha1,
> struct ref_be refs_be_files = {
> NULL,
> "files",
> + NULL,
> files_transaction_begin,
> files_transaction_update,
> files_transaction_create,
> diff --git a/refs.c b/refs.c
> index 769574d..9ce10b7 100644
> --- a/refs.c
> +++ b/refs.c
> @@ -19,13 +19,15 @@ struct ref_be *refs_backends = &refs_be_files;
> /*
> * This function is used to switch to an alternate backend.
> */
> -int set_refs_backend(const char *name)
> +int set_refs_backend(const char *name, void *init_data)
> {
> struct ref_be *be;
>
> for (be = refs_backends; be; be = be->next)
> if (!strcmp(be->name, name)) {
> the_refs_backend = be;
> + if (be->init_backend)
> + be->init_backend(init_data);
I don't like that this virtual function, alone among all of them
introduced so far, is allowed to be NULL. That seems non-obvious and
something extra that devs have to remember.
I think it would be better for the files backend to define a do-nothing
function that can be stuck in this slot.
If you are opposed to that for some reason, then please at least add a
comment where this function pointer is added to `struct ref_be`, warning
that it can be NULL.
> return 0;
> }
> return 1;
> diff --git a/refs.h b/refs.h
> index 0b407b2..0dc626e 100644
> --- a/refs.h
> +++ b/refs.h
> @@ -586,6 +586,7 @@ extern int reflog_expire(const char *refname, const
> unsigned char *sha1,
> void *policy_cb_data);
>
> /* refs backends */
> +typedef void (*ref_backend_init_fn)(void *data);
> typedef struct ref_transaction *(*ref_transaction_begin_fn)(struct strbuf
> *err);
> typedef int (*ref_transaction_update_fn)(struct ref_transaction *transaction,
> const char *refname, const unsigned char *new_sha1,
> @@ -641,6 +642,7 @@ typedef int (*for_each_reftype_fullpath_fn)(each_ref_fn
> fn, char *type,
> struct ref_be {
> struct ref_be *next;
> const char *name;
> + ref_backend_init_fn init_backend;
> ref_transaction_begin_fn transaction_begin;
> ref_transaction_update_fn transaction_update;
> ref_transaction_create_fn transaction_create;
> @@ -669,6 +671,6 @@ struct ref_be {
>
>
> extern struct ref_be refs_be_files;
> -int set_refs_backend(const char *name);
> +int set_refs_backend(const char *name, void *init_data);
>
> #endif /* REFS_H */
>
Michael
--
Michael Haggerty
mhag...@alum.mit.edu
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