refs: add a backend method structure
Add a `struct ref_storage_be` to represent types of reference stores. In
OO notation, this is the class, and will soon hold some class
methods (e.g., a factory to create new ref_store instances) and will
also serve as the vtable for ref_store instances of that type.
As yet, the backends cannot do anything.
Signed-off-by: Ronnie Sahlberg <sahlberg@google.com>
Signed-off-by: David Turner <dturner@twopensource.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/refs.c b/refs.c
index 256fef5..bee9a45 100644
--- a/refs.c
+++ b/refs.c
@@ -10,6 +10,25 @@
#include "tag.h"
/*
+ * List of all available backends
+ */
+static struct ref_storage_be *refs_backends = &refs_be_files;
+
+static struct ref_storage_be *find_ref_storage_backend(const char *name)
+{
+ struct ref_storage_be *be;
+ for (be = refs_backends; be; be = be->next)
+ if (!strcmp(be->name, name))
+ return be;
+ return NULL;
+}
+
+int ref_storage_backend_exists(const char *name)
+{
+ return find_ref_storage_backend(name) != NULL;
+}
+
+/*
* How to handle various characters in refnames:
* 0: An acceptable character for refs
* 1: End-of-component
diff --git a/refs.h b/refs.h
index 442c1a5..52ea93b 100644
--- a/refs.h
+++ b/refs.h
@@ -544,4 +544,6 @@
reflog_expiry_cleanup_fn cleanup_fn,
void *policy_cb_data);
+int ref_storage_backend_exists(const char *name);
+
#endif /* REFS_H */
diff --git a/refs/files-backend.c b/refs/files-backend.c
index c229b56..0102491 100644
--- a/refs/files-backend.c
+++ b/refs/files-backend.c
@@ -4066,3 +4066,8 @@
unlock_ref(lock);
return -1;
}
+
+struct ref_storage_be refs_be_files = {
+ NULL,
+ "files"
+};
diff --git a/refs/refs-internal.h b/refs/refs-internal.h
index 0206e2b..2c9d134 100644
--- a/refs/refs-internal.h
+++ b/refs/refs-internal.h
@@ -525,4 +525,12 @@
int read_raw_ref(const char *refname, unsigned char *sha1,
struct strbuf *referent, unsigned int *type);
+/* refs backends */
+struct ref_storage_be {
+ struct ref_storage_be *next;
+ const char *name;
+};
+
+extern struct ref_storage_be refs_be_files;
+
#endif /* REFS_REFS_INTERNAL_H */
