transport-helper: no connection restriction in connect_helper

When commit b236752a (Support remote archive from all smart transports,
2009-12-09) added "remote archive" support for "smart transports", it
was for transport that supports the ".connect" method. The
"connect_helper()" function protected itself from getting called for a
transport without the method before calling process_connect_service(),
which only worked with the ".connect" method.

Later, commit edc9caf7 (transport-helper: introduce stateless-connect,
2018-03-15) added a way for a transport without the ".connect" method
to establish a "stateless" connection in protocol v2, where
process_connect_service() was taught to handle the ".stateless_connect"
method, making the old protection too strict. But commit edc9caf7 forgot
to adjust this protection accordingly. Even at the time of commit
b236752a, this protection seemed redundant, since
process_connect_service() would return 0 if the connection could not be
established, and connect_helper() would still die() early.

Remove the restriction in connect_helper() and give the function
process_connect_service() the opportunity to establish a connection
using ".connect" or ".stateless_connect" for protocol v2. So we can
connect with a stateless-rpc and do something useful. E.g., in a later
commit, implements remote archive for a repository over HTTP protocol.

Helped-by: Junio C Hamano <gitster@pobox.com>
Helped-by: Linus Arver <linusa@google.com>
Signed-off-by: Jiang Xin <zhiyou.jx@alibaba-inc.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/transport-helper.c b/transport-helper.c
index 49811ef176dbc5af5e33fe47cf93cf1f57719f5e..2e127d24a55ab53990b2c64655b450969a7bce3a 100644 (file)
--- a/transport-helper.c
+++ b/transport-helper.c
@@ -662,8 +662,6 @@ static int connect_helper(struct transport *transport, const char *name,
 
        /* Get_helper so connect is inited. */
        get_helper(transport);
-       if (!data->connect)
-               die(_("operation not supported by protocol"));
 
        if (!process_connect_service(transport, name, exec))
                die(_("can't connect to subservice %s"), name);