[PATCH v2 28/43] refs.c: add ref backend init function

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The file backend doesn't need this function, but other backends might.

Signed-off-by: David Turner <dturner@xxxxxxxxxxxxxxxx>
Signed-off-by: Ronnie Sahlberg <rsahlberg@xxxxxxxxxx>
---
 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);
 			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 */
-- 
2.4.2.644.g97b850b-twtrsrc

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