git-commit --amend: allow empty commit.

diff --git a/tag.c b/tag.c
index b1ab75ff0164b0090f43ba55d2a70239ca2fdb7a..ac0e57398a2b236c9501ac43c517ead371b8988c 100644 (file)
--- a/tag.c
+++ b/tag.c
@@ -1,12 +1,17 @@
-#include "tag.h"
 #include "cache.h"
+#include "tag.h"
 
 const char *tag_type = "tag";
 
-struct object *deref_tag(struct object *o)
+struct object *deref_tag(struct object *o, const char *warn, int warnlen)
 {
        while (o && o->type == tag_type)
                o = parse_object(((struct tag *)o)->tagged->sha1);
+       if (!o && warn) {
+               if (!warnlen)
+                       warnlen = strlen(warn);
+               error("missing object referenced by '%.*s'", warnlen, warn);
+       }
        return o;
 }
 
@@ -70,8 +75,11 @@ int parse_tag_buffer(struct tag *item, void *data, unsigned long size)
        item->tag[taglen] = '\0';
 
        item->tagged = lookup_object_type(object, type);
-       if (item->tagged)
-               add_ref(&item->object, item->tagged);
+       if (item->tagged && track_object_refs) {
+               struct object_refs *refs = alloc_object_refs(1);
+               refs->ref[0] = item->tagged;
+               set_object_refs(&item->object, refs);
+       }
 
        return 0;
 }