add: error appropriately on repository with no commits

diff --git a/builtin/diff.c b/builtin/diff.c
index 84a362ff5625bc6ef776bcd067fa2dcb2d55038a..9f6109224b7ea75689e9780c5f79343f55e1e3e5 100644 (file)
--- a/builtin/diff.c
+++ b/builtin/diff.c
@@ -3,6 +3,7 @@
  *
  * Copyright (c) 2006 Junio C Hamano
  */
+#define USE_THE_INDEX_COMPATIBILITY_MACROS
 #include "cache.h"
 #include "config.h"
 #include "lockfile.h"
@@ -212,7 +213,7 @@ static void refresh_index_quietly(void)
        discard_cache();
        read_cache();
        refresh_cache(REFRESH_QUIET|REFRESH_UNMERGED);
-       update_index_if_able(&the_index, &lock_file);
+       repo_update_index_if_able(the_repository, &lock_file);
 }
 
 static int builtin_diff_files(struct rev_info *revs, int argc, const char **argv)