alias: add support for aliases of an alias

diff --git a/tag.c b/tag.c
index 94a89b21cb5bdeda2f8c395a7c647bf165821849..1db663d71623a493286c90b13532c7d1cf73f517 100644 (file)
--- a/tag.c
+++ b/tag.c
@@ -6,6 +6,7 @@
 #include "blob.h"
 #include "alloc.h"
 #include "gpg-interface.h"
+#include "packfile.h"
 
 const char *tag_type = "tag";
 
@@ -66,12 +67,18 @@ int gpg_verify_tag(const struct object_id *oid, const char *name_to_report,
 
 struct object *deref_tag(struct repository *r, struct object *o, const char *warn, int warnlen)
 {
+       struct object_id *last_oid = NULL;
        while (o && o->type == OBJ_TAG)
-               if (((struct tag *)o)->tagged)
-                       o = parse_object(r, &((struct tag *)o)->tagged->oid);
-               else
+               if (((struct tag *)o)->tagged) {
+                       last_oid = &((struct tag *)o)->tagged->oid;
+                       o = parse_object(r, last_oid);
+               } else {
+                       last_oid = NULL;
                        o = NULL;
+               }
        if (!o && warn) {
+               if (last_oid && is_promisor_object(last_oid))
+                       return NULL;
                if (!warnlen)
                        warnlen = strlen(warn);
                error("missing object referenced by '%.*s'", warnlen, warn);