receive-pack: treat namespace .have lines like alternates

Namely, de-duplicate them. We use the same set as the
alternates, since we call them both ".have" (i.e., there is
no value in showing one versus the other).

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/builtin/receive-pack.c b/builtin/receive-pack.c
index 1821ad5..c23b0cc 100644 (file)
--- a/builtin/receive-pack.c
+++ b/builtin/receive-pack.c
@@ -251,8 +251,9 @@ static void show_ref(const char *path, const unsigned char *sha1)
 }
 
 static int show_ref_cb(const char *path_full, const struct object_id *oid,
-                      int flag, void *unused)
+                      int flag, void *data)
 {
+       struct oidset *seen = data;
        const char *path = strip_namespace(path_full);
 
        if (ref_is_hidden(path, path_full))
@@ -263,8 +264,11 @@ static int show_ref_cb(const char *path_full, const struct object_id *oid,
         * refs, so that the client can use them to minimize data
         * transfer but will otherwise ignore them.
         */
-       if (!path)
+       if (!path) {
+               if (oidset_insert(seen, oid))
+                       return 0;
                path = ".have";
+       }
        show_ref(path, oid->hash);
        return 0;
 }
@@ -287,7 +291,7 @@ static void write_head_info(void)
 
        for_each_alternate_ref(show_one_alternate_ref, &seen);
        oidset_clear(&seen);
-       for_each_ref(show_ref_cb, NULL);
+       for_each_ref(show_ref_cb, &seen);
        if (!sent_capabilities)
                show_ref("capabilities^{}", null_sha1);