[Sugar-devel] Telepathy Salut on Sugar 0.102 on Fedora 20 almost works
Martin Abente
martin.abente.lahaye at gmail.com
Wed Sep 17 10:22:12 EDT 2014
Hello James,
On Wed, Sep 17, 2014 at 5:18 AM, James Cameron <quozl at laptop.org> wrote:
> On Tue, Sep 16, 2014 at 02:14:56PM -0400, Martin Abente wrote:
> > James, Gonzalo,
> >
> > Regarding the IBSS/Ad-hoc scenario, if I set the address manually,
> > collaborations work just fine. So this must be related to network
> > discovery.
>
> Thanks, that's interesting. Can you tell me _how_ you set the address
> manually? When I tried it there was no real difference:
My bad, here is what I am doing:
1. Used a XO with fc18 build to create the "Sugar Ad-hoc Network 2".
2. Then, from another XO with fc20 build, and before I connect to the
Ad-hoc 2 network, I edit that connection using nm-connection-editor:
(a)edit "IPv4 Settings" for the "Sugar Ad-hoc Network 2", (b) set the
method to "manual", (c) set the (address,mask,gateway). and save.
3. Then, from the neighborhood, I connect to the ad-hoc 2 network and
everything works.
>
> http://wiki.laptop.org/go/User:Quozl/Fedora_20/Manual_network_configuration
>
> > My test goes like this:
> >
> > * I use one XO with fc18+S0.100 to create an ad-hoc network network.
> > * From another XO, with fc20+S0.102, I connect to that ad-hoc network.
> >
> > The second XO ip address does not match the first one's network.
>
> Can you tell me how it does not match? It always matches when I try
> it; a link-local address 169.254.x.x valid to RFC 3927 is always
> assigned, as shown by "ip addr" command.
>
You are right, thanks for the clarifications. I might have been confused by
previous tests.
I have no idea why changing the method from "local-link" to "manual", and
manually assigning the address, mask and gateway makes such difference.
If you want to try this, set the address and mask to its original/same
values, and for the gateway use the first XO address...
>
> http://en.wikipedia.org/wiki/Link-local_address
>
> > But when I manually configure it, then buddy icons appears and
> > collaboration works...
>
> When I enable Sugar debugging and use sugar-launch as before, a new
> interesting message is seen, "No active connection available" which is
> because neither Gabble nor Salut is running.
>
> % SUGAR_LOGGER_LEVEL=debug sugar-launch org.laptop.Chat
>
> ...
> 1410934106.660510 DEBUG root: Requesting public share of activity
> 3b34e9d6ce9f294d12cd79314f7946a2f8845be5.
> 1410934106.662832 DEBUG root: Share of activity
> 3b34e9d6ce9f294d12cd79314f7946a2f8845be5 failed: No active connection
> available.
> ...
>
> The error is reported by the __share_cb method of the Activity class.
>
> /usr/lib/python2.7/site-packages/sugar3/activity/activity.py:
>
> def __share_cb(self, ps, success, activity, err):
> if not success:
> logging.debug('Share of activity %s failed: %s.' %
> (self._activity_id, err))
> return
>
> ...
>
> def share(self, private=False):
> ...
> pservice = presenceservice.get_instance()
> pservice.connect('activity-shared', self.__share_cb)
> pservice.share_activity(self, private=private)
>
> The error comes from the share_activity method of the PresenceService
> class.
>
> /usr/lib/python2.7/site-packages/sugar/presence/presenceservice.py
>
> def share_activity(self, activity, properties=None, private=True):
> ...
> connection_manager = get_connection_manager()
> account_path, connection = \
> connection_manager.get_preferred_connection()
>
> if connection is None:
> self.emit('activity-shared', False, None,
> 'No active connection available')
> return
>
> /usr/lib/python2.7/site-packages/sugar/presence/connectionmanager.py
>
> def get_preferred_connection(self):
> best_connection = None, None
> for account_path, connection in
> self._connections_per_account.items():
> if 'salut' in account_path and connection.connected:
> best_connection = account_path, connection.connection
> elif 'gabble' in account_path and connection.connected:
> best_connection = account_path, connection.connection
> break
> return best_connection
>
I followed the same path yesterday, and could not figure it out.
Similarly in /usr/lib/python2.7/site-packages/jarabe/model/neighborhood.py:
def _start_listening(self):
bus = dbus.Bus()
obj = bus.get_object(ACCOUNT_MANAGER_SERVICE, self.object_path)
obj.Get(ACCOUNT, 'Connection',
reply_handler=self.__got_connection_cb,
error_handler=partial(self.__error_handler_cb,
'Account.GetConnection'))
obj.connect_to_signal(
'AccountPropertyChanged', self.__account_property_changed_cb)
When connecting to ad-hoc, "AccountPropertyChanged" is never emitted, as it
happens in other scenarios.
> There is no /usr/libexec/telepathy-salut process. The process does
> exist if an access point is used in place of IBSS ad-hoc. The
> question becomes: why isn't Salut running?
>
The process also exists when changing the "IPv4 Settings/Method"...
>
> > On Tue, Sep 16, 2014 at 11:01 AM, Martin Abente <[1]
> > martin.abente.lahaye at gmail.com> wrote:
> >
> > Hello James,
> >
> > I included the new kernel (and reverted that commit) and now
> collaboration
> > works even between fc20+S0.102 and F18+S0.100.
> >
> > I tested it using a wifi network (with DHCP enabled) and Chat
> activity.
> >
> > Really awesome work James!
> >
> > On Tue, Sep 16, 2014 at 3:53 AM, James Cameron <[2]quozl at laptop.org>
> wrote:
> >
> > Summary: partially solved with new kernel.
> >
> > The Chat activity was run with debug logging in Terminal:
> >
> > % SUGAR_LOGGER_LEVEL=debug sugar-launch org.laptop.Chat
> >
> > At the time the activity was shared, the log showed:
> >
> > 1410842095.436535 DEBUG sugar3.presence.activity: <_ShareCommand
> object
> > at 0x527dc8 (sugar3+presence+activity+_ShareCommand at
> 0x4f7c20)>: Join
> > finished DBusException(dbus.String(u'Failed to connect to
> multicast
> > group'),)
> >
> > Telepathy Salut was failing to setup the multicast group,
> because it
> > was calling setsockopt with SO_REUSEPORT, because Fedora 20
> header
> > files define SO_REUSEPORT, but the OLPC kernel did not.
> >
> > (It is bad that the failure was not reported to the user or to
> the
> > logs unless debug logging was turned on. If someone cares, they
> can
> > raise a bug.)
> >
> > Adding SO_REUSEPORT support to the kernel [2] solved for Salut
> over
> > networks where DHCP is available; such as wired or wireless
> access
> > points. The new kernel is in the dropbox [3]. The previous
> change to
> > avahi-daemon configuration is removed [4].
> >
> > A different problem occurs with Salut over link local addresses;
> IBSS
> > ad-hoc wireless. The buddy icons are missing.
> >
> > # avahi-browse -t _presence._tcp # shows no output
> >
> > References:
> >
> > 1.
> > [3]
> http://code.metager.de/source/xref/freedesktop/telepathy/salut/lib/
> > gibber/gibber-multicast-transport.c
> >
> > 2.
> > [4]http://dev.laptop.org/git/olpc-kernel/log/?h=arm-3.5
> >
> > 3.
> > [5]http://rpmdropbox.laptop.org/f20-xo4/
> > kernel-3.5.7_xo4-20140916.0607.olpc.5196e01.armv7hl.rpm
> >
> > 4.
> > [6]
> http://dev.laptop.org/git/projects/olpc-os-builder/commit/?id=
> > f34ddb8b83ca6b9cb657e115df117ffa3704eea5
> >
> > On Thu, Sep 11, 2014 at 06:24:20PM +1000, James Cameron wrote:
> > > G'day,
> > >
> > > Activities shared by Fedora 20 systems do not appear in Network
> > > Neighbourhood on Fedora 18 or Fedora 20 systems. Buddies
> appear.
> > > Activities shared by Fedora 18 Sugar 0.98 systems appear.
> > >
> > > So this is a failure to announce sharing of activities on
> Sugar 0.102
> > > on Fedora 20.
> > >
> > > tcpdump shows mDNS packets for every operation except when an
> > activity
> > > is shared on Fedora 20.
> > >
> > > avahi-browse output is consistent with Network Neighbourhood.
> > >
> > > avahi-browse -t _presence._tcp # for buddies
> > > avahi-browse -t _clique._udp # for activities
> > >
> > > (avahi-daemon needed tweaking to compensate for lack of
> SO_REUSEPORT
> > > support in 3.5 kernel; change /etc/avahi/avahi-daemon.conf to
> set
> > > disallow-other-stacks=yes)
> > >
> > > I have tried [7]http://wiki.sugarlabs.org/go/BugSquad/
> > Telepathy_Debugging
> > > but there is no interesting output corresponding to the event.
> > >
> > > I have used strace and seen possible D-Bus activity relating
> to the
> > > event. sendmsg(11, {msg_name(0)=NULL,
> msg_iov(2)=[{"l\1\0\1<\0\0\0/\
> > 0\0\0\252\0\0\0\1\1o\0?\0\0\0/org/fre"..., 192}, {"+\0\0\[8]
> > 0org.freedesktop.Telepathy.Ch"..., 60}], msg_controllen=0,
> msg_flags=
> > 0}, MSG_NOSIGNAL) = 252
> > >
> > > I welcome any suggestions for further diagnosing this problem.
> > >
> > > --
> > > James Cameron
> > > [9]http://quozl.linux.org.au/
> >
> > --
> > James Cameron
> > [10]http://quozl.linux.org.au/
> > _______________________________________________
> > Devel mailing list
> > [11]Devel at lists.laptop.org
> > [12]http://lists.laptop.org/listinfo/devel
> >
> > References:
> >
> > [1] mailto:martin.abente.lahaye at gmail.com
> > [2] mailto:quozl at laptop.org
> > [3]
> http://code.metager.de/source/xref/freedesktop/telepathy/salut/lib/gibber/gibber-multicast-transport.c
> > [4] http://dev.laptop.org/git/olpc-kernel/log/?h=arm-3.5
> > [5] http://rpmdropbox.laptop.org/f20-xo4/
> > [6]
> http://dev.laptop.org/git/projects/olpc-os-builder/commit/?id=f34ddb8b83ca6b9cb657e115df117ffa3704eea5
> > [7] http://wiki.sugarlabs.org/go/BugSquad/Telepathy_Debugging
> > [8] http://0org.freedesktop.telepathy.ch/
> > [9] http://quozl.linux.org.au/
> > [10] http://quozl.linux.org.au/
> > [11] mailto:Devel at lists.laptop.org
> > [12] http://lists.laptop.org/listinfo/devel
>
> --
> James Cameron
> http://quozl.linux.org.au/
>
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