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# udev.py
# Python module for querying the udev database for device information.
#
# Copyright (C) 2009 Red Hat, Inc.
#
# 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, or (at your option) any later version.
# This program is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY expressed or implied, including the implied warranties of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
# Public License for more details. You should have received a copy of the
# GNU General Public License along with this program; if not, write to the
# Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
# 02110-1301, USA. Any Red Hat trademarks that are incorporated in the
# source code or documentation are not subject to the GNU General Public
# License and may only be used or replicated with the express permission of
# Red Hat, Inc.
#
# Red Hat Author(s): Dave Lehman <dlehman@redhat.com>
# Chris Lumens <clumens@redhat.com>
#
import iutil
import os
import pyudev
global_udev = pyudev.Udev()
import logging
log = logging.getLogger("storage")
def udev_enumerate_devices(deviceClass="block"):
devices = global_udev.enumerate_devices(subsystem=deviceClass)
return [path[4:] for path in devices]
def udev_get_device(sysfs_path):
if not os.path.exists("/sys%s" % sysfs_path):
log.debug("%s does not exist" % sysfs_path)
return None
# XXX we remove the /sys part when enumerating devices,
# so we have to prepend it when creating the device
dev = global_udev.create_device("/sys" + sysfs_path)
if dev:
dev["name"] = dev.sysname
dev["sysfs_path"] = sysfs_path
# now add in the contents of the uevent file since they're handy
dev = udev_parse_uevent_file(dev)
return dev
def udev_get_devices(deviceClass="block"):
udev_settle()
entries = []
for path in udev_enumerate_devices(deviceClass):
entry = udev_get_device(path)
if entry:
entries.append(entry)
return entries
def udev_parse_uevent_file(dev):
path = os.path.normpath("/sys/%s/uevent" % dev['sysfs_path'])
if not os.access(path, os.R_OK):
return dev
with open(path) as f:
for line in f.readlines():
(key, equals, value) = line.strip().partition("=")
if not equals:
continue
dev[key] = value
return dev
def udev_settle():
# wait maximal 300 seconds for udev to be done running blkid, lvm,
# mdadm etc. This large timeout is needed when running on machines with
# lots of disks, or with slow disks
# lxnay: OTOH, 300 seconds is too much in case of errors
argv = ["settle", "--timeout=30"]
iutil.execWithRedirect("udevadm", argv, stderr="/dev/null")
def udev_trigger(subsystem=None, action="add"):
argv = ["trigger", "--action=%s" % action]
if subsystem:
argv.append("--subsystem-match=%s" % subsystem)
iutil.execWithRedirect("udevadm", argv, stderr="/dev/null")
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