+ $vsnwant //= 1;
+ fail "build host has dgit rpush protocol version".
+ " $rpushprotovsn but invocation host has $vsnwant"
+ unless grep { $rpushprotovsn eq $_ } split /,/, $vsnwant;
+
+ responder_send_command("dgit-remote-push-ready $rpushprotovsn");