Now when the dbus connection is dropped, it'll fall back to polling.
I could make it try to reconnect, but there's a FD leak in the dbus
library, so not yet.
This *may* solve the segfault I was seeing when the XMPP library called
startTLS. My hypothesis is as follows:
* TLS is documented
(http://www.gnu.org/software/gnutls/manual/gnutls.html#Thread-safety)
thread safe, but only when a single thread accesses it.
* forkIO threads are not bound to an OS thread, so it was possible for
the threaded runtime to run part of the XMPP code on one thread, and
then switch to another thread later.
So, forkOS, with its bound threads, should be used for the XMPP thread.
Since the crash doesn't happen reliably, I am not yet sure about this fix.
Note that I kept all the other threads in the assistant unbound, because
bound threads have significantly higher overhead.
Seems presence notifications are not sent to clients that have marked
themselves unavailable. (Testing with google talk.)
This is the death knell for the presence hack, because it has to stay
available, and even the toggle to unavailable and back could cause it to
miss a notification. Still, flipped it so it basically works, for now.
Lacking error handling, reconnection, credentials configuration,
and doesn't actually do anything when it receives an incoming notification.
Other than that, it might work! :)
Hooked up everything that needs to notify on pushes. Note that
syncNewRemote does not notify. This is probably ok, and I'd need to thread
more state through to make it do so.
This is only set up to support a single push notification method; I didn't
use a NotificationBroadcaster. Partly because I don't yet know what info
about pushes needs to be communicated, so my data types are only
preliminary.
Monitors git-annex branch for changes, which are noticed by the Merger
thread whenever the branch ref is changed (either due to an incoming push,
or a local change), and refreshes cached config values for modified config
files.
Rate limited to run no more often than once per minute. This is important
because frequent git-annex branch changes happen when files are being
added, or transferred, etc.
A primary use case is that, when preferred content changes are made,
and get pushed to remotes, the remotes start honoring those settings.
Other use cases include propigating repository description and trust
changes to remotes, and learning when a remote has added a new special
remote, so the webapp can present the GUI to enable that special remote
locally.
Also added a uuid.log cache. All other config files already had caches.
This can result in the file being dropped, or being downloaded, or even
being dropped from some other repo.
It's even possible to create a file in a directory where content is not
wanted, which will make the assistant immediately send it elsewhere, and
then drop it.
This was complicated quite a bit by needing to check numcopies. I optimised
that, so it only looks up numcopies once per file, no matter how many
remotes it checks to drop from. Although it did just occur to me that
it might be better to first check if it wants to drop content, and only
then check numcopies..
None-bare removable drive repos don't have the assistant running in them,
so don't get their master branch updated as syncs come in. This will
probably change later, but for now, set up something that works.
Also, set the description of a newly added drive's repo locally. This
ensures that the repo edit form has the description in it.
This avoids the expensive transfer scan relying on its list of remotes
to scan being accurate throughout, which it will not be when the user
pauses syncing to a remote.
I feel it's ok to queue transfers to *any* known remote, not just the ones
being scanned.
Note that there are still small races where after syncing to a remote is
paused, a transfer can be queued for it. Not just in the expensive transfer
scan, but in the cheap failed transfer scan, and elsewhere.
Although I observe that these toggles don't always prevent syncing.
When a transfer scan is active, it will still queue items from the disabled
remote.
Also, transfers from a disabled remote show up as from "unknown", which is
not ideal.
This reserves annex.ignore for repos that should not be visible at all;
repos with syncing disabled are now skipped by the assistant, but are
displayed in the list and can be configured.
I noticed this while offline (so that lack of solar power is good for something).
Apparently it tries to bind multicast to lo, and that fails.
If this happens, catch it, and retry until a real network interface becomes
available.
It may be that this should tie into the NetWatcher, and rebind whenever
an interface comes up. Needs testing..
