506 lines
16 KiB
Python
506 lines
16 KiB
Python
|
# 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>
|
||
|
|
#
|
||
|
|
|
||
|
|
import os
|
||
|
|
|
||
|
|
import iutil
|
||
|
|
from errors import *
|
||
|
|
from baseudev import *
|
||
|
|
|
||
|
|
import logging
|
||
|
|
log = logging.getLogger("storage")
|
||
|
|
|
||
|
|
def udev_resolve_devspec(devspec):
|
||
|
|
if not devspec:
|
||
|
|
return None
|
||
|
|
|
||
|
|
import devices as _devices
|
||
|
|
ret = None
|
||
|
|
for dev in udev_get_block_devices():
|
||
|
|
if devspec.startswith("LABEL="):
|
||
|
|
if udev_device_get_label(dev) == devspec[6:]:
|
||
|
|
ret = dev
|
||
|
|
break
|
||
|
|
elif devspec.startswith("UUID="):
|
||
|
|
if udev_device_get_uuid(dev) == devspec[5:]:
|
||
|
|
ret = dev
|
||
|
|
break
|
||
|
|
elif udev_device_get_name(dev) == _devices.devicePathToName(devspec):
|
||
|
|
ret = dev
|
||
|
|
break
|
||
|
|
else:
|
||
|
|
for link in dev["symlinks"]:
|
||
|
|
if devspec == link:
|
||
|
|
ret = dev
|
||
|
|
break
|
||
|
|
|
||
|
|
del _devices
|
||
|
|
if ret:
|
||
|
|
return udev_device_get_name(ret)
|
||
|
|
|
||
|
|
def udev_resolve_glob(glob):
|
||
|
|
import fnmatch
|
||
|
|
ret = []
|
||
|
|
|
||
|
|
if not glob:
|
||
|
|
return ret
|
||
|
|
|
||
|
|
for dev in udev_get_block_devices():
|
||
|
|
name = udev_device_get_name(dev)
|
||
|
|
|
||
|
|
if fnmatch.fnmatch(name, glob):
|
||
|
|
ret.append(name)
|
||
|
|
else:
|
||
|
|
for link in dev["symlinks"]:
|
||
|
|
if fnmatch.fnmatch(link, glob):
|
||
|
|
ret.append(name)
|
||
|
|
|
||
|
|
return ret
|
||
|
|
|
||
|
|
def udev_get_block_devices():
|
||
|
|
udev_settle()
|
||
|
|
entries = []
|
||
|
|
for path in udev_enumerate_block_devices():
|
||
|
|
entry = udev_get_block_device(path)
|
||
|
|
if entry:
|
||
|
|
if entry["name"].startswith("md"):
|
||
|
|
# mdraid is really braindead, when a device is stopped
|
||
|
|
# it is no longer usefull in anyway (and we should not
|
||
|
|
# probe it) yet it still sticks around, see bug rh523387
|
||
|
|
state = None
|
||
|
|
state_file = "/sys/%s/md/array_state" % entry["sysfs_path"]
|
||
|
|
if os.access(state_file, os.R_OK):
|
||
|
|
state = open(state_file).read().strip()
|
||
|
|
if state == "clear":
|
||
|
|
continue
|
||
|
|
entries.append(entry)
|
||
|
|
return entries
|
||
|
|
|
||
|
|
def __is_blacklisted_blockdev(dev_name):
|
||
|
|
"""Is this a blockdev we never want for an install?"""
|
||
|
|
if dev_name.startswith("loop") or dev_name.startswith("ram") or dev_name.startswith("fd"):
|
||
|
|
return True
|
||
|
|
|
||
|
|
if os.path.exists("/sys/class/block/%s/device/model" %(dev_name,)):
|
||
|
|
model = open("/sys/class/block/%s/device/model" %(dev_name,)).read()
|
||
|
|
for bad in ("IBM *STMF KERNEL", "SCEI Flash-5", "DGC LUNZ"):
|
||
|
|
if model.find(bad) != -1:
|
||
|
|
log.info("ignoring %s with model %s" %(dev_name, model))
|
||
|
|
return True
|
||
|
|
|
||
|
|
return False
|
||
|
|
|
||
|
|
def udev_enumerate_block_devices():
|
||
|
|
import os.path
|
||
|
|
|
||
|
|
return filter(lambda d: not __is_blacklisted_blockdev(os.path.basename(d)),
|
||
|
|
udev_enumerate_devices(deviceClass="block"))
|
||
|
|
|
||
|
|
def udev_get_block_device(sysfs_path):
|
||
|
|
dev = udev_get_device(sysfs_path)
|
||
|
|
if not dev or not dev.has_key("name"):
|
||
|
|
return None
|
||
|
|
else:
|
||
|
|
return dev
|
||
|
|
|
||
|
|
|
||
|
|
# These are functions for retrieving specific pieces of information from
|
||
|
|
# udev database entries.
|
||
|
|
def udev_device_get_name(udev_info):
|
||
|
|
""" Return the best name for a device based on the udev db data. """
|
||
|
|
return udev_info.get("DM_NAME", udev_info["name"])
|
||
|
|
|
||
|
|
def udev_device_get_format(udev_info):
|
||
|
|
""" Return a device's format type as reported by udev. """
|
||
|
|
return udev_info.get("ID_FS_TYPE")
|
||
|
|
|
||
|
|
def udev_device_get_uuid(udev_info):
|
||
|
|
""" Get the UUID from the device's format as reported by udev. """
|
||
|
|
md_uuid = udev_info.get("MD_UUID")
|
||
|
|
uuid = udev_info.get("ID_FS_UUID")
|
||
|
|
# we don't want to return the array's uuid as a member's uuid
|
||
|
|
if uuid and not md_uuid == uuid:
|
||
|
|
return udev_info.get("ID_FS_UUID")
|
||
|
|
|
||
|
|
def udev_device_get_label(udev_info):
|
||
|
|
""" Get the label from the device's format as reported by udev. """
|
||
|
|
return udev_info.get("ID_FS_LABEL")
|
||
|
|
|
||
|
|
def udev_device_is_dm(info):
|
||
|
|
""" Return True if the device is a device-mapper device. """
|
||
|
|
return info.has_key("DM_NAME")
|
||
|
|
|
||
|
|
def udev_device_is_md(info):
|
||
|
|
""" Return True if the device is a mdraid array device. """
|
||
|
|
# Don't identify partitions on mdraid arrays as raid arrays
|
||
|
|
if udev_device_is_partition(info):
|
||
|
|
return False
|
||
|
|
# isw raid set *members* have MD_METADATA set, but are not arrays!
|
||
|
|
return info.has_key("MD_METADATA") and \
|
||
|
|
info.get("ID_FS_TYPE") != "isw_raid_member"
|
||
|
|
|
||
|
|
def udev_device_is_cciss(info):
|
||
|
|
""" Return True if the device is a CCISS device. """
|
||
|
|
return udev_device_get_name(info).startswith("cciss")
|
||
|
|
|
||
|
|
def udev_device_is_dasd(info):
|
||
|
|
""" Return True if the device is a dasd device. """
|
||
|
|
devname = info.get("DEVNAME")
|
||
|
|
if devname:
|
||
|
|
return devname.startswith("dasd")
|
||
|
|
else:
|
||
|
|
return False
|
||
|
|
|
||
|
|
def udev_device_is_zfcp(info):
|
||
|
|
""" Return True if the device is a zfcp device. """
|
||
|
|
if info.get("DEVTYPE") != "disk":
|
||
|
|
return False
|
||
|
|
|
||
|
|
subsystem = "/sys" + info.get("sysfs_path")
|
||
|
|
|
||
|
|
while True:
|
||
|
|
topdir = os.path.realpath(os.path.dirname(subsystem))
|
||
|
|
driver = "%s/driver" % (topdir,)
|
||
|
|
|
||
|
|
if os.path.islink(driver):
|
||
|
|
subsystemname = os.path.basename(os.readlink(subsystem))
|
||
|
|
drivername = os.path.basename(os.readlink(driver))
|
||
|
|
|
||
|
|
if subsystemname == 'ccw' and drivername == 'zfcp':
|
||
|
|
return True
|
||
|
|
|
||
|
|
newsubsystem = os.path.dirname(topdir)
|
||
|
|
|
||
|
|
if newsubsystem == topdir:
|
||
|
|
break
|
||
|
|
|
||
|
|
subsystem = newsubsystem + "/subsystem"
|
||
|
|
|
||
|
|
return False
|
||
|
|
|
||
|
|
def udev_device_get_zfcp_attribute(info, attr=None):
|
||
|
|
""" Return the value of the specified attribute of the zfcp device. """
|
||
|
|
if not attr:
|
||
|
|
log.debug("udev_device_get_zfcp_attribute() called with attr=None")
|
||
|
|
return None
|
||
|
|
|
||
|
|
attribute = "/sys%s/device/%s" % (info.get("sysfs_path"), attr,)
|
||
|
|
attribute = os.path.realpath(attribute)
|
||
|
|
|
||
|
|
if not os.path.isfile(attribute):
|
||
|
|
log.warning("%s is not a valid zfcp attribute" % (attribute,))
|
||
|
|
return None
|
||
|
|
|
||
|
|
return open(attribute, "r").read().strip()
|
||
|
|
|
||
|
|
def udev_device_get_dasd_bus_id(info):
|
||
|
|
""" Return the CCW bus ID of the dasd device. """
|
||
|
|
return info.get("sysfs_path").split("/")[-3]
|
||
|
|
|
||
|
|
def udev_device_get_dasd_flag(info, flag=None):
|
||
|
|
""" Return the specified flag for the dasd device. """
|
||
|
|
if flag is None:
|
||
|
|
return None
|
||
|
|
|
||
|
|
path = "/sys" + info.get("sysfs_path") + "/device/" + flag
|
||
|
|
if not os.path.isfile(path):
|
||
|
|
return None
|
||
|
|
|
||
|
|
return open(path, 'r').read().strip()
|
||
|
|
|
||
|
|
def udev_device_is_cdrom(info):
|
||
|
|
""" Return True if the device is an optical drive. """
|
||
|
|
# FIXME: how can we differentiate USB drives from CD-ROM drives?
|
||
|
|
# -- USB drives also generate a sdX device.
|
||
|
|
return info.get("ID_CDROM") == "1"
|
||
|
|
|
||
|
|
def udev_device_is_disk(info):
|
||
|
|
""" Return True is the device is a disk. """
|
||
|
|
if udev_device_is_cdrom(info):
|
||
|
|
return False
|
||
|
|
has_range = os.path.exists("/sys/%s/range" % info['sysfs_path'])
|
||
|
|
return info.get("DEVTYPE") == "disk" or has_range
|
||
|
|
|
||
|
|
def udev_device_is_partition(info):
|
||
|
|
has_start = os.path.exists("/sys/%s/start" % info['sysfs_path'])
|
||
|
|
return info.get("DEVTYPE") == "partition" or has_start
|
||
|
|
|
||
|
|
def udev_device_get_serial(udev_info):
|
||
|
|
""" Get the serial number/UUID from the device as reported by udev. """
|
||
|
|
return udev_info.get("ID_SERIAL_SHORT", udev_info.get("ID_SERIAL"))
|
||
|
|
|
||
|
|
def udev_device_get_wwid(udev_info):
|
||
|
|
""" The WWID of a device is typically just its serial number, but with
|
||
|
|
colons in the name to make it more readable. """
|
||
|
|
serial = udev_device_get_serial(udev_info)
|
||
|
|
|
||
|
|
if serial and len(serial) == 32:
|
||
|
|
retval = ""
|
||
|
|
for i in range(0, 16):
|
||
|
|
retval += serial[i*2:i*2+2] + ":"
|
||
|
|
|
||
|
|
return retval[0:-1]
|
||
|
|
|
||
|
|
return ""
|
||
|
|
|
||
|
|
def udev_device_get_vendor(udev_info):
|
||
|
|
""" Get the vendor of the device as reported by udev. """
|
||
|
|
return udev_info.get("ID_VENDOR_FROM_DATABASE", udev_info.get("ID_VENDOR"))
|
||
|
|
|
||
|
|
def udev_device_get_model(udev_info):
|
||
|
|
""" Get the model of the device as reported by udev. """
|
||
|
|
return udev_info.get("ID_MODEL_FROM_DATABASE", udev_info.get("ID_MODEL"))
|
||
|
|
|
||
|
|
def udev_device_get_bus(udev_info):
|
||
|
|
""" Get the bus a device is connected to the system by. """
|
||
|
|
return udev_info.get("ID_BUS", "").upper()
|
||
|
|
|
||
|
|
def udev_device_get_path(info):
|
||
|
|
return info["ID_PATH"]
|
||
|
|
|
||
|
|
def udev_device_get_sysfs_path(info):
|
||
|
|
return info['sysfs_path']
|
||
|
|
|
||
|
|
def udev_device_get_major(info):
|
||
|
|
return int(info["MAJOR"])
|
||
|
|
|
||
|
|
def udev_device_get_minor(info):
|
||
|
|
return int(info["MINOR"])
|
||
|
|
|
||
|
|
def udev_device_get_md_level(info):
|
||
|
|
return info.get("MD_LEVEL")
|
||
|
|
|
||
|
|
def udev_device_get_md_devices(info):
|
||
|
|
return int(info["MD_DEVICES"])
|
||
|
|
|
||
|
|
def udev_device_get_md_uuid(info):
|
||
|
|
return info["MD_UUID"]
|
||
|
|
|
||
|
|
def udev_device_get_md_container(info):
|
||
|
|
return info.get("MD_CONTAINER")
|
||
|
|
|
||
|
|
def udev_device_get_md_name(info):
|
||
|
|
return info.get("MD_DEVNAME")
|
||
|
|
|
||
|
|
def udev_device_get_vg_name(info):
|
||
|
|
return info['LVM2_VG_NAME']
|
||
|
|
|
||
|
|
def udev_device_get_vg_uuid(info):
|
||
|
|
return info['LVM2_VG_UUID']
|
||
|
|
|
||
|
|
def udev_device_get_vg_size(info):
|
||
|
|
# lvm's decmial precision is not configurable, so we tell it to use
|
||
|
|
# KB and convert to MB here
|
||
|
|
return float(info['LVM2_VG_SIZE']) / 1024
|
||
|
|
|
||
|
|
def udev_device_get_vg_free(info):
|
||
|
|
# lvm's decmial precision is not configurable, so we tell it to use
|
||
|
|
# KB and convert to MB here
|
||
|
|
return float(info['LVM2_VG_FREE']) / 1024
|
||
|
|
|
||
|
|
def udev_device_get_vg_extent_size(info):
|
||
|
|
# lvm's decmial precision is not configurable, so we tell it to use
|
||
|
|
# KB and convert to MB here
|
||
|
|
return float(info['LVM2_VG_EXTENT_SIZE']) / 1024
|
||
|
|
|
||
|
|
def udev_device_get_vg_extent_count(info):
|
||
|
|
return int(info['LVM2_VG_EXTENT_COUNT'])
|
||
|
|
|
||
|
|
def udev_device_get_vg_free_extents(info):
|
||
|
|
return int(info['LVM2_VG_FREE_COUNT'])
|
||
|
|
|
||
|
|
def udev_device_get_vg_pv_count(info):
|
||
|
|
return int(info['LVM2_PV_COUNT'])
|
||
|
|
|
||
|
|
def udev_device_get_pv_pe_start(info):
|
||
|
|
# lvm's decmial precision is not configurable, so we tell it to use
|
||
|
|
# KB and convert to MB here
|
||
|
|
return float(info['LVM2_PE_START']) / 1024
|
||
|
|
|
||
|
|
def udev_device_get_lv_names(info):
|
||
|
|
names = info['LVM2_LV_NAME']
|
||
|
|
if not names:
|
||
|
|
names = []
|
||
|
|
elif not isinstance(names, list):
|
||
|
|
names = [names]
|
||
|
|
return names
|
||
|
|
|
||
|
|
def udev_device_get_lv_uuids(info):
|
||
|
|
uuids = info['LVM2_LV_UUID']
|
||
|
|
if not uuids:
|
||
|
|
uuids = []
|
||
|
|
elif not isinstance(uuids, list):
|
||
|
|
uuids = [uuids]
|
||
|
|
return uuids
|
||
|
|
|
||
|
|
def udev_device_get_lv_sizes(info):
|
||
|
|
# lvm's decmial precision is not configurable, so we tell it to use
|
||
|
|
# KB and convert to MB here
|
||
|
|
sizes = info['LVM2_LV_SIZE']
|
||
|
|
if not sizes:
|
||
|
|
sizes = []
|
||
|
|
elif not isinstance(sizes, list):
|
||
|
|
sizes = [sizes]
|
||
|
|
|
||
|
|
return [float(s) / 1024 for s in sizes]
|
||
|
|
|
||
|
|
def udev_device_get_lv_attr(info):
|
||
|
|
attr = info['LVM2_LV_ATTR']
|
||
|
|
if not attr:
|
||
|
|
attr = []
|
||
|
|
elif not isinstance(attr, list):
|
||
|
|
attr = [attr]
|
||
|
|
return attr
|
||
|
|
|
||
|
|
def udev_device_is_biosraid(info):
|
||
|
|
# Note that this function does *not* identify raid sets.
|
||
|
|
# Tests to see if device is parto of a dmraid set.
|
||
|
|
# dmraid and mdraid have the same ID_FS_USAGE string, ID_FS_TYPE has a
|
||
|
|
# string that describes the type of dmraid (isw_raid_member...), I don't
|
||
|
|
# want to maintain a list and mdraid's ID_FS_TYPE='linux_raid_member', so
|
||
|
|
# dmraid will be everything that is raid and not linux_raid_member
|
||
|
|
from formats.dmraid import DMRaidMember
|
||
|
|
from formats.mdraid import MDRaidMember
|
||
|
|
if info.has_key("ID_FS_TYPE") and \
|
||
|
|
(info["ID_FS_TYPE"] in DMRaidMember._udevTypes or \
|
||
|
|
info["ID_FS_TYPE"] in MDRaidMember._udevTypes) and \
|
||
|
|
info["ID_FS_TYPE"] != "linux_raid_member":
|
||
|
|
return True
|
||
|
|
|
||
|
|
return False
|
||
|
|
|
||
|
|
def udev_device_get_dmraid_partition_disk(info):
|
||
|
|
try:
|
||
|
|
p_index = info["DM_NAME"].rindex("p")
|
||
|
|
except (KeyError, AttributeError, ValueError):
|
||
|
|
return None
|
||
|
|
|
||
|
|
if not info["DM_NAME"][p_index+1:].isdigit():
|
||
|
|
return None
|
||
|
|
|
||
|
|
return info["DM_NAME"][:p_index]
|
||
|
|
|
||
|
|
def udev_device_is_dmraid_partition(info, devicetree):
|
||
|
|
diskname = udev_device_get_dmraid_partition_disk(info)
|
||
|
|
dmraid_devices = devicetree.getDevicesByType("dm-raid array")
|
||
|
|
|
||
|
|
for device in dmraid_devices:
|
||
|
|
if diskname == device.name:
|
||
|
|
return True
|
||
|
|
|
||
|
|
return False
|
||
|
|
|
||
|
|
def udev_device_is_multipath_partition(info, devicetree):
|
||
|
|
""" Return True if the device is a partition of a multipath device. """
|
||
|
|
if not udev_device_is_dm(info):
|
||
|
|
return False
|
||
|
|
if not info["DM_NAME"].startswith("mpath"):
|
||
|
|
return False
|
||
|
|
diskname = udev_device_get_dmraid_partition_disk(info)
|
||
|
|
if diskname is None:
|
||
|
|
return False
|
||
|
|
|
||
|
|
# this is sort of a lame check, but basically, if diskname gave us "mpath0"
|
||
|
|
# and we start with "mpath" but we're not "mpath0", then we must be
|
||
|
|
# "mpath0" plus some non-numeric crap.
|
||
|
|
if diskname != info["DM_NAME"]:
|
||
|
|
return True
|
||
|
|
|
||
|
|
return False
|
||
|
|
|
||
|
|
def udev_device_get_multipath_partition_disk(info):
|
||
|
|
""" Return True if the device is a partition of a multipath device. """
|
||
|
|
# XXX PJFIX This whole function is crap.
|
||
|
|
if not udev_device_is_dm(info):
|
||
|
|
return False
|
||
|
|
if not info["DM_NAME"].startswith("mpath"):
|
||
|
|
return False
|
||
|
|
diskname = udev_device_get_dmraid_partition_disk(info)
|
||
|
|
return diskname
|
||
|
|
|
||
|
|
def udev_device_is_multipath_member(info):
|
||
|
|
""" Return True if the device is part of a multipath. """
|
||
|
|
return info.get("ID_FS_TYPE") == "multipath_member"
|
||
|
|
|
||
|
|
def udev_device_get_multipath_name(info):
|
||
|
|
""" Return the name of the multipath that the device is a member of. """
|
||
|
|
if udev_device_is_multipath_member(info):
|
||
|
|
return info['ID_MPATH_NAME']
|
||
|
|
return None
|
||
|
|
|
||
|
|
# iscsi disks have ID_PATH in the form of:
|
||
|
|
# ip-${iscsi_address}:${iscsi_port}-iscsi-${iscsi_tgtname}-lun-${lun}
|
||
|
|
def udev_device_is_iscsi(info):
|
||
|
|
try:
|
||
|
|
path_components = udev_device_get_path(info).split("-")
|
||
|
|
|
||
|
|
if info["ID_BUS"] == "scsi" and len(path_components) >= 6 and \
|
||
|
|
path_components[0] == "ip" and path_components[2] == "iscsi":
|
||
|
|
return True
|
||
|
|
except KeyError:
|
||
|
|
pass
|
||
|
|
|
||
|
|
return False
|
||
|
|
|
||
|
|
def udev_device_get_iscsi_name(info):
|
||
|
|
path_components = udev_device_get_path(info).split("-")
|
||
|
|
|
||
|
|
# Tricky, the name itself contains atleast 1 - char
|
||
|
|
return "-".join(path_components[3:len(path_components)-2])
|
||
|
|
|
||
|
|
def udev_device_get_iscsi_address(info):
|
||
|
|
path_components = udev_device_get_path(info).split("-")
|
||
|
|
|
||
|
|
return path_components[1].split(":")[0]
|
||
|
|
|
||
|
|
def udev_device_get_iscsi_port(info):
|
||
|
|
path_components = udev_device_get_path(info).split("-")
|
||
|
|
|
||
|
|
return path_components[1].split(":")[1]
|
||
|
|
|
||
|
|
# fcoe disks have ID_PATH in the form of:
|
||
|
|
# pci-eth#-fc-${id}
|
||
|
|
# fcoe parts look like this:
|
||
|
|
# pci-eth#-fc-${id}-part#
|
||
|
|
def udev_device_is_fcoe(info):
|
||
|
|
try:
|
||
|
|
path_components = udev_device_get_path(info).split("-")
|
||
|
|
|
||
|
|
if info["ID_BUS"] == "scsi" and len(path_components) >= 4 and \
|
||
|
|
path_components[0] == "pci" and path_components[2] == "fc" and \
|
||
|
|
path_components[1][0:3] == "eth":
|
||
|
|
return True
|
||
|
|
except LookupError:
|
||
|
|
pass
|
||
|
|
|
||
|
|
return False
|
||
|
|
|
||
|
|
def udev_device_get_fcoe_nic(info):
|
||
|
|
path_components = udev_device_get_path(info).split("-")
|
||
|
|
|
||
|
|
return path_components[1]
|
||
|
|
|
||
|
|
def udev_device_get_fcoe_identifier(info):
|
||
|
|
path_components = udev_device_get_path(info).split("-")
|
||
|
|
|
||
|
|
return path_components[3]
|