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qubes-installer-qubes-os/anaconda/pyanaconda/storage/udev.py
Marek Marczykowski 00c5528adc anaconda: import unmodified 18.37.11 version from fc18
2013-01-24 01:45:53 +01:00

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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>
#
import os
import re
from pyanaconda import iutil
from errors import *
from pyanaconda.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:
spec = devspec
if not spec.startswith("/dev/"):
spec = os.path.normpath("/dev/" + spec)
for link in dev["symlinks"]:
if spec == 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("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. """
if "DM_NAME" in udev_info:
name = udev_info["DM_NAME"]
else:
name = udev_info["name"]
return 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 len(uuid) > 0 and \
re.sub(r'\W', '', md_uuid) != re.sub(r'\W', '', 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
# The udev information keeps shifting around. Only md arrays have a
# /sys/class/block/<name>/md/ subdirectory.
md_dir = "/sys" + udev_device_get_sysfs_path(info) + "/md"
return os.path.exists(md_dir)
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_is_loop(info):
""" Return True if the device is a configured loop device. """
return (udev_device_get_name(info).startswith("loop") and
os.path.isdir("/sys/%s/loop" % info['sysfs_path']))
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_RAW", 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)
return iutil.insert_colons(serial) if serial else ""
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_by_path(info):
if info.has_key('symlinks'):
for link in info['symlinks']:
if link.startswith('/dev/disk/by-path/'):
return link
return udev_device_get_name(info)
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_lv_vg_name(info):
return info['DM_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_dm_subsystem_match(info, subsystem):
""" Return True if the device matches a given device-mapper subsystem. """
uuid = info.get("DM_UUID", "")
uuid_fields = uuid.split("-")
_subsystem = uuid_fields[0]
if _subsystem.lower().startswith("part") and len(uuid_fields) > 1:
# kpartx uses partN- as a subsystem prefix, which we ignore because
# we only care about the subsystem of the partitions' parent device.
_subsystem = uuid_fields[1]
if _subsystem == uuid or not _subsystem:
return False
return _subsystem.lower() == subsystem.lower()
def udev_device_is_dm_lvm(info):
""" Return True if the device is an LVM logical volume. """
return udev_device_dm_subsystem_match(info, "lvm")
def udev_device_is_dm_crypt(info):
""" Return True if the device is a mapped dm-crypt device. """
return udev_device_dm_subsystem_match(info, "crypt")
def udev_device_is_dm_luks(info):
""" Return True if the device is a mapped LUKS device. """
is_crypt = udev_device_dm_subsystem_match(info, "crypt")
try:
_type = info.get("DM_UUID", "").split("-")[1].lower()
except IndexError:
_type = ""
return is_crypt and _type.startswith("luks")
def udev_device_is_dm_raid(info):
""" Return True if the device is a dmraid array device. """
return udev_device_dm_subsystem_match(info, "dmraid")
def udev_device_is_dm_mpath(info):
""" Return True if the device is a multipath device. """
return udev_device_dm_subsystem_match(info, "mpath")
def udev_device_is_dm_anaconda(info):
""" Return True if the device is an anaconda disk image. """
return udev_device_dm_subsystem_match(info, "anaconda")
def udev_device_is_dm_livecd(info):
""" Return True if the device is a livecd OS image. """
# return udev_device_dm_subsystem_match(info, "livecd")
return (udev_device_is_dm(info) and
udev_device_get_name(info).startswith("live"))
def udev_device_is_biosraid_member(info):
# Note that this function does *not* identify raid sets.
# Tests to see if device is part 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_dm_partition_disk(info):
return re.sub(r'\d*$', '', udev_device_get_name(info))
def udev_device_is_dm_partition(info):
return (udev_device_is_dm(info) and
info.get("DM_UUID", "").split("-")[0].startswith("part"))
def udev_device_is_multipath_member(info):
""" Return True if the device is part of a multipath. """
return info.get("ID_FS_TYPE") == "multipath_member"
def udev_device_get_multipath_name(info):
""" Return the name of the multipath that the device is a member of. """
if udev_device_is_multipath_member(info):
return info['ID_MPATH_NAME']
return None
# iscsi disks' ID_PATH form depends on the driver:
# for software iscsi:
# ip-${iscsi_address}:${iscsi_port}-iscsi-${iscsi_tgtname}-lun-${lun}
# for partial offload iscsi:
# pci-${pci_address}-ip-${iscsi_address}:${iscsi_port}-iscsi-${iscsi_tgtname}-lun-${lun}
# Note that in the case of IPV6 iscsi_address itself can contain :
# too, but iscsi_port never contains :
def udev_device_is_sw_iscsi(info):
# software iscsi
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_is_partoff_iscsi(info):
# partial offload iscsi
try:
path_components = udev_device_get_path(info).split("-")
if info["ID_BUS"] == "scsi" and len(path_components) >= 8 and \
path_components[2] == "ip" and path_components[4] == "iscsi":
return True
except KeyError:
pass
return False
def udev_device_is_iscsi(info):
return udev_device_is_sw_iscsi(info) or udev_device_is_partoff_iscsi(info)
def udev_device_get_iscsi_name(info):
name_field = 3
if udev_device_is_partoff_iscsi(info):
name_field = 5
path_components = udev_device_get_path(info).split("-")
# Tricky, the name itself contains atleast 1 - char
return "-".join(path_components[name_field:len(path_components)-2])
def udev_device_get_iscsi_address(info):
address_field = 1
if udev_device_is_partoff_iscsi(info):
address_field = 3
path_components = udev_device_get_path(info).split("-")
# IPV6 addresses contain : within the address, so take everything
# before the last : as address
return ":".join(path_components[address_field].split(":")[:-1])
def udev_device_get_iscsi_port(info):
address_field = 1
if udev_device_is_partoff_iscsi(info):
address_field = 3
path_components = udev_device_get_path(info).split("-")
# IPV6 contains : within the address, the part after the last : is the port
return path_components[address_field].split(":")[-1]
def udev_device_get_iscsi_session(info):
# '/devices/pci0000:00/0000:00:02.0/0000:09:00.0/0000:0a:01.0/0000:0e:00.2/host3/session1/target3:0:0/3:0:0:0/block/sda'
# The position of sessionX part depends on device
# (e.g. offload vs. sw; also varies for different offload devs)
session = None
match = re.match('/.*/(session\d+)', info["sysfs_path"])
if match:
session = match.groups()[0]
else:
log.error("udev_device_get_iscsi_session: session not found in %s" % info)
return session
def udev_device_get_iscsi_nic(info):
iface = None
session = udev_device_get_iscsi_session(info)
if session:
iface = open("/sys/class/iscsi_session/%s/ifacename" %
session).read().strip()
return iface
def udev_device_get_iscsi_initiator(info):
initiator = None
if udev_device_is_partoff_iscsi(info):
host = re.match('.*/(host\d+)', info["sysfs_path"]).groups()[0]
if host:
initiator_file = "/sys/class/iscsi_host/%s/initiatorname" % host
if os.access(initiator_file, os.R_OK):
initiator = open(initiator_file).read().strip()
log.debug("found offload iscsi initiatorname %s in file %s" %
(initiator, initiator_file))
if initiator.lstrip("(").rstrip(")").lower() == "null":
initiator = None
if initiator is None:
session = udev_device_get_iscsi_session(info)
if session:
initiator = open("/sys/class/iscsi_session/%s/initiatorname" %
session).read().strip()
log.debug("found iscsi initiatorname %s" % initiator)
return initiator
# fcoe disks have ID_PATH in the form of:
# For FCoE directly over the NIC (so no VLAN and thus no DCB):
# pci-eth#-fc-${id}
# For FCoE over a VLAN (the DCB case)
# fc-${id}
# fcoe parts look like this:
# pci-eth#-fc-${id}-part#
# fc-${id}-part#
# For the FCoE over VLAN case we also do some checks on the sysfs_path as
# the ID_PATH does not contain all info we need there, the sysfs_path for
# an fcoe disk over VLAN looks like this:
# /devices/virtual/net/eth4.802-fcoe/host3/rport-3:0-4/target3:0:1/3:0:1:0/block/sde
# And for a partition:
# /devices/virtual/net/eth4.802-fcoe/host3/rport-3:0-4/target3:0:1/3:0:1:0/block/sde/sde1
# This is completely different for Broadcom FCoE devices (bnx2fc), where we use
# the sysfs path:
# /devices/pci0000:00/0000:00:02.0/0000:09:00.0/0000:0a:01.0/0000:0e:00.0/host3/rport-3:0-2/target3:0:1/3:0:1:3/block/sdm
# and find whether the host has 'fc_host' and if it the device has a bound
# Ethernet interface.
def _detect_broadcom_fcoe(info):
re_pci_host=re.compile('/(.*)/(host\d+)')
match = re_pci_host.match(info["sysfs_path"])
if match:
sysfs_pci, host = match.groups()
if os.access('/sys/%s/%s/fc_host' %(sysfs_pci, host), os.X_OK) and \
os.access('/sys/%s/net' %(sysfs_pci), os.X_OK):
return (sysfs_pci, host)
return (None, None)
def udev_device_is_fcoe(info):
if info.get("ID_BUS") != "scsi":
return False
path = info.get("ID_PATH", "")
path_components = path.split("-")
if path.startswith("pci-eth") and len(path_components) >= 4 and \
path_components[2] == "fc":
return True
if path.startswith("fc-") and "fcoe" in info["sysfs_path"]:
return True
if _detect_broadcom_fcoe(info) != (None, None):
return True
return False
def udev_device_get_fcoe_nic(info):
path = info.get("ID_PATH", "")
path_components = path.split("-")
if path.startswith("pci-eth") and len(path_components) >= 4 and \
path_components[2] == "fc":
return path_components[1]
if path.startswith("fc-") and "fcoe" in info["sysfs_path"]:
return info["sysfs_path"].split("/")[4].split(".")[0]
(sysfs_pci, host) = _detect_broadcom_fcoe(info)
if (sysfs_pci, host) != (None, None):
net_path = '/sys/%s/net' % sysfs_pci
listdir = os.listdir(net_path)
if len(listdir) > 0 :
return listdir[0]
def udev_device_get_fcoe_identifier(info):
path = info.get("ID_PATH", "")
path_components = path.split("-")
if path.startswith("pci-eth") and len(path_components) >= 4 and \
path_components[2] == "fc":
return path_components[3]
if path.startswith("fc-") and "fcoe" in info["sysfs_path"]:
return path_components[1]
if udev_device_is_fcoe(info) and len(path_components) >= 4 and \
path_components[2] == 'fc':
return path_components[3]
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