specialrefdb: introduce a special reference database

src/libgit2/repository.h

@@ -26,7 +26,7 @@
 #include "submodule.h"
 #include "diff_driver.h"
 #include "grafts.h"
-#include "specialrefs.h"
+#include "specialref.h"
 
 #define DOT_GIT ".git"
 #define GIT_DIR DOT_GIT "/"

src/libgit2/specialref.c

@@ -0,0 +1,27 @@
+/*
+ * Copyright (C) the libgit2 contributors. All rights reserved.
+ *
+ * This file is part of libgit2, distributed under the GNU GPL v2 with
+ * a Linking Exception. For full terms see the included COPYING file.
+ */
+
+#include "specialref.h"
+
+#include "common.h"
+#include "refs.h"
+#include "repository.h"
+#include "specialrefdb.h"
+
+#include "git2/types.h"
+#include "git2/refs.h"
+
+int git_specialref_lookup_head(git_reference **out, git_repository *repo)
+{
+	git_specialrefdb *db;
+	int error;
+
+	if ((error = git_repository_specialrefdb__weakptr(&db, repo)) < 0)
+		return error;
+
+	return git_specialrefdb_lookup_head(out, db);
+}

src/libgit2/specialref.h

@@ -0,0 +1,16 @@
+/*
+ * Copyright (C) the libgit2 contributors. All rights reserved.
+ *
+ * This file is part of libgit2, distributed under the GNU GPL v2 with
+ * a Linking Exception. For full terms see the included COPYING file.
+ */
+#ifndef INCLUDE_specialref_h__
+#define INCLUDE_specialref_h__
+
+#include "common.h"
+
+#include "git2/refs.h"
+
+extern int git_specialref_lookup_head(git_reference **out, git_repository *repo);
+
+#endif

src/libgit2/specialrefdb_git.c

@@ -5,7 +5,7 @@
  * a Linking Exception. For full terms see the included COPYING file.
  */
 
-#include "specialrefs.h"
+#include "specialref.h"
 
 #include "git2/sys/specialrefdb_backend.h"