refs: make verify_refname_available() virtual

diff --git a/refs/refs-internal.h b/refs/refs-internal.h
index 19cb6e11ad231560400a448838c60ff8ad1669a4..6c698f442d4029ec799307d87b1ddde3ba5d45e8 100644 (file)
--- a/refs/refs-internal.h
+++ b/refs/refs-internal.h
@@ -542,6 +542,12 @@ typedef int read_raw_ref_fn(struct ref_store *ref_store,
                            const char *refname, unsigned char *sha1,
                            struct strbuf *referent, unsigned int *type);
 
+typedef int verify_refname_available_fn(struct ref_store *ref_store,
+                                       const char *newname,
+                                       const struct string_list *extras,
+                                       const struct string_list *skip,
+                                       struct strbuf *err);
+
 struct ref_storage_be {
        struct ref_storage_be *next;
        const char *name;
@@ -549,6 +555,7 @@ struct ref_storage_be {
        ref_transaction_commit_fn *transaction_commit;
 
        read_raw_ref_fn *read_raw_ref;
+       verify_refname_available_fn *verify_refname_available;
 };
 
 extern struct ref_storage_be refs_be_files;