From: Ronnie Sahlberg <sahlb...@google.com>

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 <sahlb...@google.com>
Signed-off-by: David Turner <dtur...@twopensource.com>
Signed-off-by: Junio C Hamano <gits...@pobox.com>
Signed-off-by: Jeff King <p...@peff.net>
Signed-off-by: Michael Haggerty <mhag...@alum.mit.edu>
Signed-off-by: Junio C Hamano <gits...@pobox.com>
---
 refs.c               | 19 +++++++++++++++++++
 refs.h               |  2 ++
 refs/files-backend.c |  5 +++++
 refs/refs-internal.h |  8 ++++++++
 4 files changed, 34 insertions(+)

diff --git a/refs.c b/refs.c
index 4c609df..d2a29bb 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 1b02043..9a29f1b 100644
--- a/refs.h
+++ b/refs.h
@@ -544,4 +544,6 @@ int reflog_expire(const char *refname, const unsigned char 
*sha1,
                  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 aa09586..ecf66e6 100644
--- a/refs/files-backend.c
+++ b/refs/files-backend.c
@@ -4076,3 +4076,8 @@ int reflog_expire(const char *refname, const unsigned 
char *sha1,
        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 do_for_each_ref_iterator(struct ref_iterator *iter,
 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 */
-- 
2.9.3

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