[PATCH v3 29/44] refs.c: add ref backend init function

[David Turner <dturner@twopensource.com>]

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

Signed-off-by: David Turner <dturner@twopensource.com>
Signed-off-by: Ronnie Sahlberg <rsahlberg@google.com>
---
 refs-be-files.c | 6 ++++++
 refs.c          | 3 ++-
 refs.h          | 4 +++-
 3 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/refs-be-files.c b/refs-be-files.c
index 73111e7..f123459 100644
--- a/refs-be-files.c
+++ b/refs-be-files.c
@@ -3307,6 +3307,11 @@ static int ref_present(const char *refname,
 
 	return string_list_has_string(affected_refnames, refname);
 }
+ 
+void files_init_backend(void *data)
+{
+	/* do nothing */
+}
 
 int initial_ref_transaction_commit(struct ref_transaction *transaction,
 				   struct strbuf *err)
@@ -3532,6 +3537,7 @@ int reflog_expire(const char *refname, const unsigned char *sha1,
 struct ref_be refs_be_files = {
 	NULL,
 	"files",
+	files_init_backend,
 	files_transaction_commit,
 	files_resolve_ref_unsafe,
 	files_verify_refname_available,
diff --git a/refs.c b/refs.c
index 1de8529..6370ace 100644
--- a/refs.c
+++ b/refs.c
@@ -19,13 +19,14 @@ 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;
+			be->init_backend(init_data);
 			return 0;
 		}
 	return 1;
diff --git a/refs.h b/refs.h
index 6d284f5..e76553a 100644
--- a/refs.h
+++ b/refs.h
@@ -675,6 +675,7 @@ 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 int ref_transaction_commit_fn(struct ref_transaction *transaction,
 				      struct strbuf *err);
 typedef void ref_transaction_free_fn(struct ref_transaction *transaction);
@@ -714,6 +715,7 @@ 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_commit_fn *transaction_commit;
 	resolve_ref_unsafe_fn *resolve_ref_unsafe;
 	verify_refname_available_fn *verify_refname_available;
@@ -736,6 +738,6 @@ 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