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We need to place query operations in the queue to prevent the case where
a client knows of something before the service does. For example if a
client creates a PV/VG/LV outside of the dbus API and then immediately
tries to lookup and use that resource in the lvm dbus service it should
be present. By placing the queries in the work queue any previous
refresh operation will complete before we process the query.
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.
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.
We will fetch the lvm state in non-main thread and only process the new
data with the main thread to prevent hanging the main thread event loop.
ref. https://bugs.freedesktop.org/show_bug.cgi?id=98521
- Prevent --lvmshell with --nojson, not a valid combination
- If user is preventing json, then no lvmshell usage
- Return boolean on Manager.UseLvmShell
The normal mode of operation will be to monitor for udev events until an
ExternalEvent occurs. In that case the service will disable monitoring
for udev events and use ExternalEvent exclusively.
Note: User specifies --udev the service will always monitor udev regardless
if ExternalEvent is being called too.
With the addition of JSON and the ability to get output which is known to
not contain any extraneous text we can now leverage lvm shell, so that we
don't fork and exec lvm command line repeatedly.
While running on F24 a number of warnings were being emitted from using the
deprecated GObject instead of GLib. Tested on python 3.4 and 3.5.
Signed-off-by: Tony Asleson <tasleson@redhat.com>
When we use udev or have lvm call back into the dbus service when a
change occurs, even if that change originated from the dbus service
we end up refreshing the state of the system twice which is not
needed or wanted. This change handles this case by removing any
pending refreshes in the worker queue if the state of the system
was just updated.
Signed-off-by: Tony Asleson <tasleson@redhat.com>
export LVMDBUSD_SESSION=True to run on the session bus instead
of the system bus so that we can run the unit test without
installing the dbus conf file.
Signed-off-by: Tony Asleson <tasleson@redhat.com>
