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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 . import cfg
from .request import RequestEntry
from . import utils
observer = None
observer_lock = threading.RLock()
_udev_lock = threading.RLock()
_udev_count = 0
def udev_add():
global _udev_count
with _udev_lock:
if _udev_count == 0:
_udev_count += 1
# Place this on the queue so any other operations will sequence
# behind it
r = RequestEntry(
-1, _udev_event, (), None, None, False)
cfg.worker_q.put(r)
def udev_complete():
global _udev_count
with _udev_lock:
if _udev_count > 0:
_udev_count -= 1
def _udev_event():
utils.log_debug("Processing udev event")
udev_complete()
cfg.load()
# noinspection PyUnusedLocal
def filter_event(action, device):
# Filter for events of interest and add a request object to be processed
# when appropriate.
refresh = False
# Ignore everything but change
if action != 'change':
return
if 'ID_FS_TYPE' in device:
fs_type_new = device['ID_FS_TYPE']
if 'LVM' in fs_type_new:
# If we get a lvm related udev event for a block device
# we don't know about, it's either a pvcreate which we
# would handle with the dbus notification or something
# copied a pv signature onto a block device, this is
# required to catch the latter.
if not cfg.om.get_object_by_lvm_id(device['DEVNAME']):
refresh = True
elif fs_type_new == '':
# Check to see if the device was one we knew about
if 'DEVNAME' in device:
if cfg.om.get_object_by_lvm_id(device['DEVNAME']):
refresh = True
else:
# This handles the wipefs -a path
if not refresh and 'DEVNAME' in device:
if cfg.om.get_object_by_lvm_id(device['DEVNAME']):
refresh = True
if refresh:
udev_add()
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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