From 5b872fff187037829fdd3e494acdf4299ff6e80b Mon Sep 17 00:00:00 2001
From: Brandon Williams <bmwill@google.com>
Date: Thu, 15 Mar 2018 10:31:26 -0700
Subject: push: pass ref prefixes when pushing

Construct a list of ref prefixes to be passed to 'get_refs_list()' from
the refspec to be used during the push.  This list of ref prefixes will
be used to allow the server to filter the ref advertisement when
communicating using protocol v2.

Signed-off-by: Brandon Williams <bmwill@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/transport.c b/transport.c
index 3f13051..57bdbb5 100644
--- a/transport.c
+++ b/transport.c
@@ -1028,11 +1028,38 @@ int transport_push(struct transport *transport,
 		int porcelain = flags & TRANSPORT_PUSH_PORCELAIN;
 		int pretend = flags & TRANSPORT_PUSH_DRY_RUN;
 		int push_ret, ret, err;
+		struct refspec *tmp_rs;
+		struct argv_array ref_prefixes = ARGV_ARRAY_INIT;
+		int i;
 
 		if (check_push_refs(local_refs, refspec_nr, refspec) < 0)
 			return -1;
 
-		remote_refs = transport->vtable->get_refs_list(transport, 1, NULL);
+		tmp_rs = parse_push_refspec(refspec_nr, refspec);
+		for (i = 0; i < refspec_nr; i++) {
+			const char *prefix = NULL;
+
+			if (tmp_rs[i].dst)
+				prefix = tmp_rs[i].dst;
+			else if (tmp_rs[i].src && !tmp_rs[i].exact_sha1)
+				prefix = tmp_rs[i].src;
+
+			if (prefix) {
+				const char *glob = strchr(prefix, '*');
+				if (glob)
+					argv_array_pushf(&ref_prefixes, "%.*s",
+							 (int)(glob - prefix),
+							 prefix);
+				else
+					expand_ref_prefix(&ref_prefixes, prefix);
+			}
+		}
+
+		remote_refs = transport->vtable->get_refs_list(transport, 1,
+							       &ref_prefixes);
+
+		argv_array_clear(&ref_prefixes);
+		free_refspec(refspec_nr, tmp_rs);
 
 		if (flags & TRANSPORT_PUSH_ALL)
 			match_flags |= MATCH_REFS_ALL;
-- 
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