refs: expose has_log() on the backend

The frontend used to look at the file directly, but that's obviously not
the right thing to do. Expose it on the backend and use that function
instead.

2 files changed, 8 insertions, 3 deletions

diff --git a/include/git2/refs.h b/include/git2/refs.h
index 31bf997fe..f88f448f0 100644
--- a/include/git2/refs.h
+++ b/include/git2/refs.h
@@ -548,12 +548,12 @@ GIT_EXTERN(int) git_reference_foreach_glob(
 /**
  * Check if a reflog exists for the specified reference.
  *
- * @param ref A git reference
- *
+ * @param repo the repository
+ * @param refname the reference's name
  * @return 0 when no reflog can be found, 1 when it exists;
  * otherwise an error code.
  */
-GIT_EXTERN(int) git_reference_has_log(git_reference *ref);
+GIT_EXTERN(int) git_reference_has_log(git_repository *repo, const char *refname);
 
 /**
  * Ensure there is a reflog for a particular reference.
diff --git a/include/git2/sys/refdb_backend.h b/include/git2/sys/refdb_backend.h
index 1485ed73a..5bbd4ba4c 100644
--- a/include/git2/sys/refdb_backend.h
+++ b/include/git2/sys/refdb_backend.h
@@ -117,6 +117,11 @@ struct git_refdb_backend {
 	int (*compress)(git_refdb_backend *backend);
 
 	/**
+	 * Query whether a particular reference has a log (may be empty)
+	 */
+	int (*has_log)(git_refdb_backend *backend, const char *refname);
+
+	/**
 	 * Make sure a particular reference will have a reflog which
 	 * will be appended to on writes.
 	 */