Should use async dbus calls when talking to syncdaemon, and stop blocking nautilus UI

Binary package hint: ubuntuone-client

Nautilus takes several minutes to start on login here, because it blocks waiting for syncdaemon to respond:

(gdb) bt
#0 0x00007faa72ee31e3 in __poll (fds=<value optimised out>,
    nfds=<value optimised out>, timeout=22310)
    at ../sysdeps/unix/sysv/linux/poll.c:87
#1 0x00007faa7148e400 in socket_do_iteration (transport=0x2379800, flags=6,
    timeout_milliseconds=22310) at dbus-transport-socket.c:1066
#2 0x00007faa7148c81d in _dbus_transport_do_iteration (transport=0x2379800,
    flags=<value optimised out>, timeout_milliseconds=<value optimised out>)
    at dbus-transport.c:956
#3 0x00007faa71478c7e in _dbus_connection_do_iteration_unlocked (
    connection=0x2379eb0, flags=6, timeout_milliseconds=22310)
    at dbus-connection.c:1163
#4 0x00007faa7147b0f4 in _dbus_connection_block_pending_call (
    pending=0x23b3f20) at dbus-connection.c:2428
#5 0x00007faa716b989e in dbus_g_proxy_end_call_internal (
    proxy=<value optimised out>, call_id=<value optimised out>,
    error=<value optimised out>, first_arg_type=<value optimised out>,
    args=0x7fff82f9f220) at dbus-gproxy.c:2272
#6 0x00007faa716ba4e3 in dbus_g_proxy_call (proxy=0x23f7590,
    method=<value optimised out>, error=<value optimised out>,
    first_arg_type=0) at dbus-gproxy.c:2601
#7 0x00007faa5b614ba8 in syncdaemon_folders_interface_get_folders ()
   from /usr/lib/libsyncdaemon-1.0.so.1
#8 0x00007faa5bc841da in ubuntuone_is_storagefs ()
---Type <return> to continue, or q <return> to quit---
   from /usr/lib/nautilus/extensions-2.0/libnautilus-ubuntuone.so
#9 0x00007faa5bc84446 in ?? ()
   from /usr/lib/nautilus/extensions-2.0/libnautilus-ubuntuone.so
#10 0x00000000004b7497 in ?? ()
#11 0x00000000004b3c46 in ?? ()
#12 0x00000000004b6f21 in ?? ()
#13 0x00007faa754b5ddb in load_contents_close_callback (
    obj=<value optimised out>, close_res=<value optimised out>,
    user_data=0x24a3050) at /build/buildd/glib2.0-2.25.15/gio/gfile.c:6297
#14 0x00007faa754d030d in async_ready_close_callback_wrapper (
    source_object=0x7faa60003460, res=0x23cf300, user_data=0x24a3050)
    at /build/buildd/glib2.0-2.25.15/gio/ginputstream.c:484
#15 0x00007faa754e0bb8 in complete_in_idle_cb_for_thread (
    _data=<value optimised out>)
    at /build/buildd/glib2.0-2.25.15/gio/gsimpleasyncresult.c:757
#16 0x00007faa742267e2 in g_main_dispatch (context=0x2183eb0)
    at /build/buildd/glib2.0-2.25.15/glib/gmain.c:2119
#17 g_main_context_dispatch (context=0x2183eb0)
    at /build/buildd/glib2.0-2.25.15/glib/gmain.c:2672
#18 0x00007faa7422a748 in g_main_context_iterate (context=0x2183eb0,
    block=<value optimised out>, dispatch=<value optimised out>,
    self=<value optimised out>)
    at /build/buildd/glib2.0-2.25.15/glib/gmain.c:2750
---Type <return> to continue, or q <return> to quit---
#19 0x00007faa7422ac55 in g_main_loop_run (loop=0x2389350)
    at /build/buildd/glib2.0-2.25.15/glib/gmain.c:2958
#20 0x00007faa75dc0a47 in IA__gtk_main ()
    at /build/buildd/gtk+2.0-2.21.7/gtk/gtkmain.c:1237
#21 0x0000000000442132 in ?? ()
#22 0x00007faa72e27d8e in __libc_start_main (main=<value optimised out>,
    argc=<value optimised out>, ubp_av=<value optimised out>,
    init=<value optimised out>, fini=<value optimised out>,
    rtld_fini=<value optimised out>, stack_end=0x7fff82f9fb98)
    at libc-start.c:226
#23 0x000000000042f199 in ?? ()
#24 0x00007fff82f9fb98 in ?? ()
#25 0x000000000000001c in ?? ()
#26 0x0000000000000001 in ?? ()
#27 0x00007fff82fa1afa in ?? ()
#28 0x0000000000000000 in ?? ()
(gdb)

Please use async calls where it's likely that syncdaemon may take a little while to respond, and don't block the entire nautilus UI