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# Copyright (C) 2015-2016 Red Hat, Inc. All rights reserved.
#
# This copyrighted material is made available to anyone wishing to use,
# modify, copy, or redistribute it subject to the terms and conditions
# of the GNU General Public License v.2.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import pyudev
import threading
from .refresh import event_add
from . import cfg
observer = None
observer_lock = threading.RLock()
# noinspection PyUnusedLocal
def filter_event(action, device):
# Filter for events of interest and add a request object to be processed
# when appropriate.
refresh = False
if '.ID_FS_TYPE_NEW' in device:
fs_type_new = device['.ID_FS_TYPE_NEW']
if 'LVM' in fs_type_new:
refresh = True
elif fs_type_new == '':
# Check to see if the device was one we knew about
if 'DEVNAME' in device:
found = cfg.om.get_object_by_lvm_id(device['DEVNAME'])
if found:
refresh = True
if 'DM_LV_NAME' in device:
refresh = True
if refresh:
event_add(('udev',))
def add():
with observer_lock:
global observer
context = pyudev.Context()
monitor = pyudev.Monitor.from_netlink(context)
monitor.filter_by('block')
observer = pyudev.MonitorObserver(monitor, filter_event)
observer.start()
def remove():
with observer_lock:
global observer
if observer:
observer.stop()
observer = None
return True
return False
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