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When dmeventd configured command does not start with 'lvm ' prefix,
it's going to be an 'external' command.
In this case we split command by spaces to argv strings.
When thin-pool processes event and 'lvextend --use-policies' fails
rather capture up-to-date new info as the fullness percentage may
have jumped noticable. This way we could use 'more' correct numbers
when checking for thresholds.
The function timeout_add_seconds has quite a bit of variability. Using
timeout_add which specifies the timeout in ms instead of seconds. Testing
shows that this is much more consistent which should improve clients that
are using shorter timeouts for the API and the connection.
Added a properties changed signal on the job dbus object so that client
can wait for a signal that the job is complete instead of polling or
blocking on the wait method.
Allows the user to override the number of commands that get dumped
to the log when we encounter a lvm error. Also useful during
development when you don't want to see the blackbox output.
When reading data from stdout & stderr we were reading until the
reading until we got None back which really isn't needed as the
read will return everything that is available.
We need to acquire a lock which can block us which in turn causes
the dbus request handling to block as well. Place the request on
the work queue instead.
Our expectation was that when using the lvm shell that when the lvm prompt
was read from stdout, that all other ouput had been written and flushed.
However, this doesn't appear to be the case. Add extra read passes to
retrieve delayed report data.
In preparation to have more than one thread issuing commands to lvm
at the same time we need to serialize updates to the dbus state and
retrieving the global lvm state. To achieve this we have one thread
handling this with a thread safe queue taking and coalescing requests.
This code is no longer needed because the back ground task has been
removed. Will add back if we change the design and end up utilizing
multiple worker threads.
There is no reason to create another background task when the task that
created it is going to block waiting for it to finish. Instead we will
just execute the logic in the worker thread that is servicing the worker
queue.
Translate log_info() into log_very_verbose() which is macro
supposed to be used by our code.
log_info() is internal macro with eventually some 'symbolic' meaning
in syslogging daemons.
Ensure different logging function for dmeventd.c logging
and dm and lvm library.
We can recognize we want to show every log_info() and
log_notice() message from dmeventd.c code while not
exposing those from libdm/libdevmapper-event
Also switch to use log with errno - it's not changing
anything and doesn't bring any more features yet to dmeventd
logging but we just properly pass dm_errno_or_class properly
through the whole code stack for possible future use
(i.e. support of class logging for dmeventd).
