transport: add got_remote_refs flag

transport_get_remote_refs() in tranport.c checks transport->remote_refs
to determine whether transport->get_refs_list() should be invoked.  The
logic is "if it is NULL, we haven't run ls-remote to find out yet".

However, transport->remote_refs could still be NULL while cloning from
an empty repository.  This causes get_refs_list() to be run unnecessarily.

Introduce a flag, transport->got_remote_refs, to more explicitly record
if we have run transport->get_refs_list() already.

Signed-off-by: Tay Ray Chuan <rctay89@gmail.com>
Acked-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/transport.c b/transport.c
index 3846aacb476b552cefddd8774b9a055e353b6ebc..08e4fa0354d64e2b931be68ed8da111b97273523 100644 (file)
--- a/transport.c
+++ b/transport.c
@@ -918,6 +918,7 @@ struct transport *transport_get(struct remote *remote, const char *url)
        if (!remote)
                die("No remote provided to transport_get()");
 
+       ret->got_remote_refs = 0;
        ret->remote = remote;
        helper = remote->foreign_vcs;
 
@@ -1079,8 +1080,10 @@ int transport_push(struct transport *transport,
 
 const struct ref *transport_get_remote_refs(struct transport *transport)
 {
-       if (!transport->remote_refs)
+       if (!transport->got_remote_refs) {
                transport->remote_refs = transport->get_refs_list(transport, 0);
+               transport->got_remote_refs = 1;
+       }
 
        return transport->remote_refs;
 }

diff --git a/transport.h b/transport.h
index 7cea5cc7234185b1c37ada818dfa1a9114621ad2..6dd9ae182fe12c53860a6af02461ff819d59fd6e 100644 (file)
--- a/transport.h
+++ b/transport.h
@@ -19,6 +19,12 @@ struct transport {
        void *data;
        const struct ref *remote_refs;
 
+       /**
+        * Indicates whether we already called get_refs_list(); set by
+        * transport.c::transport_get_remote_refs().
+        */
+       unsigned got_remote_refs : 1;
+
        /**
         * Returns 0 if successful, positive if the option is not
         * recognized or is inapplicable, and negative if the option