path: root/isys/isys.py

#
# isys.py - installer utility functions and glue for C module
#
# Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007  Red Hat, Inc.
# All rights reserved.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty 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, see <http://www.gnu.org/licenses/>.
#
# Author(s): Matt Wilson <msw@redhat.com>
#            Erik Troan <ewt@redhat.com>
#            Jeremy Katz <katzj@redhat.com>
#

import _isys
import string
import os
import os.path
import socket
import stat
import posix
import sys
import iutil
import warnings
import resource
import re
import struct
import block
import minihal
import rhpl
import dbus

import logging
log = logging.getLogger("anaconda")
import warnings

NM_SERVICE = "org.freedesktop.NetworkManager"
NM_MANAGER_PATH = "/org/freedesktop/NetworkManager"
NM_MANAGER_IFACE = "org.freedesktop.NetworkManager"
DBUS_PROPS_IFACE = "org.freedesktop.DBus.Properties"
NM_ACTIVE_CONNECTION_IFACE = "org.freedesktop.NetworkManager.Connection.Active"
NM_CONNECTION_IFACE = "org.freedesktop.NetworkManagerSettings.Connection"
NM_DEVICE_IFACE = "org.freedesktop.NetworkManager.Device"

NM_STATE_UNKNOWN = 0
NM_STATE_ASLEEP = 1
NM_STATE_CONNECTING = 2
NM_STATE_CONNECTED = 3
NM_STATE_DISCONNECTED = 4

mountCount = {}
raidCount = {}

MIN_RAM = _isys.MIN_RAM
MIN_GUI_RAM = _isys.MIN_GUI_RAM
EARLY_SWAP_RAM = _isys.EARLY_SWAP_RAM

## Get the amount of free space available under a directory path.
# @param path The directory path to check.
# @return The amount of free space available, in 
def pathSpaceAvailable(path):
    return _isys.devSpaceFree(path)

mdadmOutput = "/tmp/mdadmout"

## An error occured when running mdadm.
class MdadmError(Exception):
    ## The constructor.
    # @param args The arguments passed to the mdadm command.
    # @param name The the name of the RAID device used in the mdadm command.
    def __init__(self, args, name=None):
        self.args = args
        self.name = name
        self.log = self.getCmdOutput()

    ## Get the output of the last mdadm command run.
    # @return The formatted output of the mdadm command which caused an error.
    def getCmdOutput(self):
        f = open(mdadmOutput, "r")
        lines = reduce(lambda x,y: x + [string.strip(y),], f.readlines(), [])
        lines = string.join(reduce(lambda x,y: x + ["   %s" % (y,)], \
                                    lines, []), "\n")
        return lines

    def __str__(self):
        s = ""
        if not self.name is None:
            s = " for device %s" % (self.name,)
        command = "mdadm " + string.join(self.args, " ")
        return "'%s' failed%s\nLog:\n%s" % (command, s, self.log)

def _mdadm(*args):
    try:
        lines = iutil.execWithCapture("mdadm", args, stderr = mdadmOutput)
        lines = string.split(lines, '\n')
        lines = reduce(lambda x,y: x + [y.strip(),], lines, [])
        return lines
    except:
        raise MdadmError, args

def _getRaidInfo(drive):
    log.info("mdadm -E %s" % (drive,))
    try:
        lines = _mdadm("-E", drive)
    except MdadmError:
        ei = sys.exc_info()
        ei[1].name = drive
        raise ei[0], ei[1], ei[2]

    info = {
            'major': "-1",
            'minor': "-1",
            'uuid' : "",
            'level': -1,
            'nrDisks': -1,
            'totalDisks': -1,
            'mdMinor': -1,
        }

    for line in lines:
        vals = string.split(string.strip(line), ' : ')
        if len(vals) != 2:
            continue
        if vals[0] == "Version":
            vals = string.split(vals[1], ".")
            info['major'] = vals[0]
            info['minor'] = vals[1]
        elif vals[0] == "UUID":
            info['uuid'] = vals[1]
        elif vals[0] == "Raid Level":
            info['level'] = int(vals[1][4:])
        elif vals[0] == "Raid Devices":
            info['nrDisks'] = int(vals[1])
        elif vals[0] == "Total Devices":
            info['totalDisks'] = int(vals[1])
        elif vals[0] == "Preferred Minor":
            info['mdMinor'] = int(vals[1])
        else:
            continue

    if info['uuid'] == "":
        raise ValueError, info

    return info

def _stopRaid(mdDevice):
    log.info("mdadm --stop %s" % (mdDevice,))
    try:
        _mdadm("--stop", mdDevice)
    except MdadmError:
        ei = sys.exc_info()
        ei[1].name = mdDevice
        raise ei[0], ei[1], ei[2]

def raidstop(mdDevice):
    log.info("stopping raid device %s" %(mdDevice,))
    if raidCount.has_key (mdDevice):
        if raidCount[mdDevice] > 1:
            raidCount[mdDevice] = raidCount[mdDevice] - 1
            return
        del raidCount[mdDevice]

    devInode = "/dev/%s" % mdDevice

    try:
        _stopRaid(devInode)
    except:
        pass

def _startRaid(mdDevice, mdMinor, uuid):
    log.info("mdadm -A --uuid=%s --super-minor=%s %s" % (uuid, mdMinor, mdDevice))
    try:
        _mdadm("-A", "--uuid=%s" % (uuid,), "--super-minor=%s" % (mdMinor,), \
                mdDevice)
    except MdadmError:
        ei = sys.exc_info()
        ei[1].name = mdDevice
        raise ei[0], ei[1], ei[2]

def raidstart(mdDevice, aMember):
    log.info("starting raid device %s" %(mdDevice,))
    if raidCount.has_key(mdDevice) and raidCount[mdDevice]:
	raidCount[mdDevice] = raidCount[mdDevice] + 1
	return

    raidCount[mdDevice] = 1

    mdInode = "/dev/%s" % mdDevice
    mbrInode = "/dev/%s" % aMember

    if os.path.exists(mdInode):
        minor = os.minor(os.stat(mdInode).st_rdev)
    else:
        minor = int(mdDevice[2:])
    try:
        info = _getRaidInfo(mbrInode)
        if info.has_key('mdMinor'):
            minor = info['mdMinor']
        _startRaid(mdInode, minor, info['uuid'])
    except:
        pass

## Remove the superblock from a RAID device.
# @param device The complete path to the RAID device name to wipe.
def wipeRaidSB(device):
    try:
        fd = os.open(device, os.O_WRONLY)
    except OSError, e:
        log.warning("error wiping raid device superblock for %s: %s", device, e)
        return

    try:
        _isys.wiperaidsb(fd)
    finally:
        os.close(fd)
    return

## Get the raw superblock from a RAID device.
# @param The basename of a RAID device to check.  This device node does not
#        need to exist to begin with.
# @return A RAID superblock in its raw on-disk format.
def raidsb(mdDevice):
    return raidsbFromDevice("/dev/%s" % mdDevice)

## Get the superblock from a RAID device.
# @param The full path to a RAID device name to check.  This device node must
#        already exist.
# @return A tuple of the contents of the RAID superblock, or ValueError on
#         error.
def raidsbFromDevice(device):
    try:
        info = _getRaidInfo(device)
        return (info['major'], info['minor'], info['uuid'], info['level'],
                info['nrDisks'], info['totalDisks'], info['mdMinor'])
    except:
        raise ValueError

def getRaidChunkFromDevice(device):
    fd = os.open(device, os.O_RDONLY)
    rc = 64
    try:
        rc = _isys.getraidchunk(fd)
    finally:
        os.close(fd)
    return rc

## Set up an already existing device node to be used as a loopback device.
# @param device The full path to a device node to set up as a loopback device.
# @param file The file to mount as loopback on device.
# @param readOnly Should this loopback device be used read-only?
def losetup(device, file, readOnly = 0):
    if readOnly:
	mode = os.O_RDONLY
    else:
	mode = os.O_RDWR
    targ = os.open(file, mode)
    loop = os.open(device, mode)
    try:
        _isys.losetup(loop, targ, file)
    finally:
        os.close(loop)
        os.close(targ)

def lochangefd(device, file):
    loop = os.open(device, os.O_RDONLY)
    targ = os.open(file, os.O_RDONLY)
    try:
        _isys.lochangefd(loop, targ)
    finally:
        os.close(loop)
        os.close(targ)

## Disable a previously setup loopback device.
# @param device The full path to an existing loopback device node.
def unlosetup(device):
    loop = os.open(device, os.O_RDONLY)
    try:
        _isys.unlosetup(loop)
    finally:
        os.close(loop)

def ddfile(file, megs, pw = None):
    buf = '\x00' * (1024 * 256)

    fd = os.open(file, os.O_RDWR | os.O_CREAT)

    total = megs * 4	    # we write out 1/4 of a meg each time through

    if pw:
	(fn, title, text) = pw
	win = fn(title, text, total - 1)

    for n in range(total):
	os.write(fd, buf)
	if pw:
	    win.set(n)

    if pw:
	win.pop()

    os.close(fd)

## Mount a filesystem, similar to the mount system call.
# @param device The device to mount.  If bindMount is 1, this should be an
#               already mounted directory.  Otherwise, it should be a device
#               name.
# @param location The path to mount device on.
# @param fstype The filesystem type on device.  This can be disk filesystems
#               such as vfat or ext3, or pseudo filesystems such as proc or
#               selinuxfs.
# @param readOnly Should this filesystem be mounted readonly?
# @param bindMount Is this a bind mount?  (see the mount(8) man page)
# @param remount Are we mounting an already mounted filesystem?
# @return The return value from the mount system call.
def mount(device, location, fstype = "ext2", readOnly = 0, bindMount = 0, remount = 0, options = "defaults"):
    flags = None
    location = os.path.normpath(location)
    opts = string.split(options)

    # We don't need to create device nodes for devices that start with '/'
    # (like '/usbdevfs') and also some special fake devices like 'proc'.
    # First try to make a device node and if that fails, assume we can
    # mount without making a device node.  If that still fails, the caller
    # will have to deal with the exception.
    # We note whether or not we created a node so we can clean up later.

    if mountCount.has_key(location) and mountCount[location] > 0:
	mountCount[location] = mountCount[location] + 1
	return

    if readOnly or bindMount or remount:
        if readOnly:
            opts.append("ro")
        if bindMount:
            opts.append("bind")
        if remount:
            opts.append("remount")

    flags = ",".join(opts)

    log.debug("isys.py:mount()- going to mount %s on %s with options %s" %(device, location, flags))
    rc = _isys.mount(fstype, device, location, flags)

    if not rc:
	mountCount[location] = 1

    return rc

## Unmount a filesystem, similar to the umount system call.
# @param what The directory to be unmounted.  This does not need to be the
#             absolute path.
# @param removeDir Should the mount point be removed after being unmounted?
# @return The return value from the umount system call.
def umount(what, removeDir = 1):
    what = os.path.normpath(what)

    if not os.path.isdir(what):
	raise ValueError, "isys.umount() can only umount by mount point"

    if mountCount.has_key(what) and mountCount[what] > 1:
	mountCount[what] = mountCount[what] - 1
	return

    rc = _isys.umount(what)

    if removeDir and os.path.isdir(what):
        try:
            os.rmdir(what)
        except:
            pass

    if not rc and mountCount.has_key(what):
	del mountCount[what]

    return rc

## Get the SMP status of the system.
# @return True if this is an SMP system, False otherwise.
def smpAvailable():
    return _isys.smpavailable()

htavailable = _isys.htavailable

## Disable swap.
# @param path The full path of the swap device to disable.
def swapoff (path):
    return _isys.swapoff (path)

## Enable swap.
# @param path The full path of the swap device to enable.
def swapon (path):
    return _isys.swapon (path)

## Load a keyboard layout for text mode installs.
# @param keymap The keyboard layout to load.  This must be one of the values
#               from rhpl.KeyboardModels.
def loadKeymap(keymap):
    return _isys.loadKeymap (keymap)

cachedDrives = None

## Clear the drive dict cache.
# This method clears the drive dict cache.  If the drive state changes (by
# loading and unloading modules, attaching removable devices, etc.) then this
# function must be called before any of the *DriveDict or *DriveList functions.
# If not, those functions will return information that does not reflect the
# current machine state.
def flushDriveDict():
    global cachedDrives
    cachedDrives = None

def driveDict(klassArg):
    import parted
    global cachedDrives
    if cachedDrives is None:
        new = {}
        for dev in minihal.get_devices_by_type("storage"):
            if dev['device'] is None: # none devices make no sense
                continue

            device = dev['device'].replace('/dev/','')
            # we can't actually use the sg devices, so ignore them
            if device.startswith("sg"):
                log.info("ignoring sg device %s" %(device,))
                continue

            # we can't actually use the st devices, so ignore them
            if device.startswith("st"):
                log.info("ignoring st device %s" %(device,))
                continue

            # we want to ignore md devices as they're not hard disks in our pov
            if device.startswith("md"):
                continue

            if dev['storage.drive_type'] != 'disk':
                new[device] = dev
                continue
            try:
                if not mediaPresent (device):
                    new[device] = dev
                    continue

                # blacklist the device which the live image is running from
                # installing over that is almost certainly the wrong
                # thing to do.
                if os.path.exists("/dev/live") and \
                       stat.S_ISBLK(os.stat("/dev/live")[stat.ST_MODE]):
                    livetarget = os.path.realpath("/dev/live")
                    if livetarget.startswith(dev['device']):
                        log.info("%s looks to be the live device; ignoring" % (device,))
                        continue

                if device.startswith("sd"):
                    peddev = parted.PedDevice.get(dev['device'])
                    model = peddev.model

                    # blacklist *STMF on power5 iSeries boxes
                    if iutil.isPPC() and \
                            model.find("IBM *STMF KERNEL") != -1:
                        log.info("%s looks like STMF, ignoring" % (device,))
                        del peddev
                        continue

                    # blacklist PS3 flash 
                    if iutil.isPPC() and \
                            model.find("SCEI Flash-5") != -1:
                        log.info("%s looks like PS3 flash, ignoring" % \
                            (device,))
                        del peddev
                        continue

                    # blacklist DGC/EMC LUNs for which we have no ACL.
                    # We should be ignoring LUN_Z for all vendors, but I
                    # don't know how (if) other vendors encode this into
                    # the model info.
                    #
                    # XXX I need to work some SCC2 LUN mode page detection
                    # into libbdevid, and then this should use that instead.
                    # -- pjones
                    if str(peddev.model) == "DGC LUNZ":
                        log.info("%s looks like a LUN_Z device, ignoring" % \
                            (device,))
                        del peddev
                        continue

                    del peddev
                new[device] = dev
            except Exception, e:
                log.debug("exception checking disk blacklist on %s: %s" % \
                    (device, e))
        cachedDrives = new

    ret = {}
    for key,dev in cachedDrives.items():
        # XXX these devices should have deviceclass attributes.  Or they
        # should all be subclasses in a device tree and we should be able
        # to use isinstance on all of them.  Not both.
        if isinstance(dev, block.MultiPath) or isinstance(dev, block.RaidSet):
            if klassArg == "disk":
                ret[key] = dev
        elif dev['storage.drive_type'] == klassArg:
            ret[key] = dev
    return ret

## Get all the hard drives attached to the system.
# This method queries the drive dict cache for all hard drives.  If the cache
# is empty, this will cause all disk devices to be probed.  If the status of
# the devices has changed, flushDriveDict must be called first.
#
# @see flushDriveDict
# @see driveDict
# @return A dict of all the hard drive descriptions, keyed on device name.
def hardDriveDict():
    ret = {}
    dict = driveDict("disk")
    for item in dict.keys():
        try:
            ret[item] = dict[item]['description']
        except AttributeError:
            ret[item] = ""
    return ret

## Get all the removable drives attached to the system.
# This method queries the drive dict cache for all removable drives.  If the cache
# is empty, this will cause all disk devices to be probed.  If the status of
# the devices has changed, flushDriveDict must be run called first.
#
# @see flushDriveDict
# @see driveDict
# @return A dict of all the removable drive descriptions, keyed on device name.
def removableDriveDict():
    ret = {}
    dict = driveDict("disk")
    for item in dict.keys():
        if dict[item]['storage.removable'] != 0:
            try:
                ret[item] = dict[item]['description']
            except AttributeError:
                ret[item] = ""
    return ret

## Get all CD/DVD drives attached to the system.
# This method queries the drive dict cache for all hard drives.  If the cache
# is empty, this will cause all disk devices to be probed.  If the status of
# the devices has changed, flushDriveDict must be called first.
#
# @see flushDriveDict
# @see driveDict
# @return A sorted list of all the CD/DVD drives, without any leading /dev/.
def cdromList():
    list = driveDict("cdrom").keys()
    list.sort()
    return list

## Get all tape drives attached to the system.
# This method queries the drive dict cache for all hard drives.  If the cache
# is empty, this will cause all disk devices to be probed.  If the status of
# the devices has changed, flushDriveDict must be called first.
#
# @see flushDriveDict
# @see driveDict
# @return A sorted list of all the tape drives, without any leading /dev/.
def tapeDriveList():
    list = driveDict("tape").keys()
    list.sort()
    return list

def getDasdPorts():
    return _isys.getDasdPorts()

def isUsableDasd(device):
    return _isys.isUsableDasd(device)

def isLdlDasd(device):
    return _isys.isLdlDasd(device)

# read /proc/dasd/devices and get a mapping between devs and the dasdnum
def getDasdDevPort():
    ret = {}
    f = open("/proc/dasd/devices", "r")
    lines = f.readlines()
    f.close()

    for line in lines:
        index = line.index("(")
        dasdnum = line[:index]

        start = line[index:].find("dasd")
        end = line[index + start:].find(":")
        dev = line[index + start:end + start + index].strip()

        ret[dev] = dasdnum

    return ret

# get active/ready state of a dasd device
# returns 0 if we're fine, 1 if not
def getDasdState(dev):
    devs = getDasdDevPort()
    if not devs.has_key(dev):
        log.warning("don't have %s in /dev/dasd/devices!" %(dev,))
        return 0

    f = open("/proc/dasd/devices", "r")
    lines = f.readlines()
    f.close()

    for line in lines:
        if not line.startswith(devs[dev]):
            continue
        # 2.6 seems to return basic
        if line.find(" basic") != -1:
            return 1
        # ... and newer 2.6 returns unformatted.  consistency!
        if line.find(" unformatted") != -1:
            return 1

    return 0

## Calculate the broadcast address of a network.
# @param ip An IPv4 address as a string.
# @param nm A corresponding netmask as a string.
# @return A tuple of network address and broadcast address strings.
def inet_calcNetBroad (ip, nm):
    (ipaddr,) = struct.unpack('I', socket.inet_pton(socket.AF_INET, ip))
    ipaddr = socket.ntohl(ipaddr)

    (nmaddr,) = struct.unpack('I', socket.inet_pton(socket.AF_INET, nm))
    nmaddr = socket.ntohl(nmaddr)

    netaddr = ipaddr & nmaddr
    bcaddr = netaddr | (~nmaddr)

    nw = socket.inet_ntop(socket.AF_INET, struct.pack('!I', netaddr))
    bc = socket.inet_ntop(socket.AF_INET, struct.pack('!I', bcaddr))

    return (nw, bc)

def doProbeBiosDisks():
    if not iutil.isX86():
        return None
    return _isys.biosDiskProbe()

def doGetBiosDisk(mbrSig):
    return _isys.getbiosdisk(mbrSig)

handleSegv = _isys.handleSegv

biosdisks = {}
for d in range(80, 80 + 15):
    disk = doGetBiosDisk("%d" %(d,))
    #print "biosdisk of %s is %s" %(d, disk)
    if disk is not None:
        biosdisks[disk] = d

def compareDrives(first, second):
    if biosdisks.has_key(first) and biosdisks.has_key(second):
        one = biosdisks[first]
        two = biosdisks[second]
        if (one < two):
            return -1
        elif (one > two):
            return 1

    if first.startswith("hd"):
        type1 = 0
    elif first.startswith("sd"):
        type1 = 1
    elif (first.startswith("vd") or first.startswith("xvd")):
        type1 = -1
    else:
        type1 = 2

    if second.startswith("hd"):
        type2 = 0
    elif second.startswith("sd"):
	type2 = 1
    elif (second.startswith("vd") or second.startswith("xvd")):
        type2 = -1
    else:
	type2 = 2

    if (type1 < type2):
	return -1
    elif (type1 > type2):
	return 1
    else:
	len1 = len(first)
	len2 = len(second)

	if (len1 < len2):
	    return -1
	elif (len1 > len2):
	    return 1
	else:
	    if (first < second):
		return -1
	    elif (first > second):
		return 1

    return 0

def compareNetDevices(first, second):
    try:
        trimmed_first = float(first.lstrip(string.letters))
        trimmed_second = float(second.lstrip(string.letters))
    except:
        return 0

    if trimmed_first < trimmed_second:
        return -1
    elif trimmed_first > trimmed_second:
        return 1
    else:
        return 0

# called from anaconda (basically rescue mode only) to configure an interface
# when we have collected all of the configuration information from the user
def configNetDevice(device, gateway):
    devname = device.get('device')
    ipv4 = device.get('ipaddr')
    netmask = device.get('netmask')
    ipv6 = device.get('ipv6addr')
    prefix = device.get('ipv6prefix')

    return _isys.confignetdevice(devname, ipv4, netmask, ipv6, prefix, gateway)

def resetResolv():
    return _isys.resetresolv()

def setResolvRetry(count):
    return _isys.setresretry(count)

# called from anaconda to run DHCP (that's DHCP, DHCPv6, or auto neighbor
# discovery) on a particular interface
def dhcpNetDevice(device):
    # returns None on failure, "" if no nameserver is found, nameserver IP
    # otherwise
    devname = device.get('device')
    v4 = 0
    v6 = 0
    v4method = ''
    v6method = ''
    klass = device.get('dhcpclass')

    if device.get('useipv4'):
        v4 = 1
        if device.get('bootproto') == 'dhcp':
            v4method = 'dhcp'
        else:
            v4method = 'manual'

    if device.get('useipv6'):
        v6 = 1
        if device.get('ipv6_autoconf') == 'yes':
            v6method = 'auto'
        elif device.get('ipv6_autoconf') == 'no' and device.get('bootproto') == 'dhcp':
            v6method = 'dhcp'
        else:
            v6method = 'manual'

    if klass is None:
        klass = ''

    return _isys.dhcpnetdevice(devname, v4, v4method, v6, v6method, klass)

def readFSUuid(device):
    if not os.path.exists(device):
        device = "/dev/%s" % device

    label = _isys.getblkid(device, "UUID")
    return label

def readFSLabel(device):
    if not os.path.exists(device):
        device = "/dev/%s" % device

    label = _isys.getblkid(device, "LABEL")
    return label

def readFSType(device):
    if not os.path.exists(device):
        device = "/dev/%s" % device

    fstype = _isys.getblkid(device, "TYPE")
    if fstype is None:
        # FIXME: libblkid doesn't show physical volumes as having a filesystem
        # so let's sniff for that.(#409321)
        try:
            fd = os.open(device, os.O_RDONLY)
            buf = os.read(fd, 2048)
        except:
            return fstype
        finally:
            try:
                os.close(fd)
            except:
                pass

        if buf.startswith("HM"):
            return "physical volume (LVM)"
        for sec in range(0, 4):
            off = (sec * 512) + 24
            if len(buf) < off:
                continue
            if buf[off:].startswith("LVM2"):
                return "physical volume (LVM)"
    if fstype == "ext4":
        return "ext4dev"
    elif fstype == "lvm2pv":
        return "physical volume (LVM)"
    return fstype

def ext2Clobber(device):
    _isys.e2fsclobber(device)

def ext2IsDirty(device):
    label = _isys.e2dirty(device)
    return label

def ext2HasJournal(device):
    hasjournal = _isys.e2hasjournal(device);
    return hasjournal

def ejectCdrom(device):
    fd = os.open(device, os.O_RDONLY|os.O_NONBLOCK)

    # this is a best effort
    try:
	_isys.ejectcdrom(fd)
    except SystemError, e:
        log.warning("error ejecting cdrom (%s): %s" %(device, e))
	pass

    os.close(fd)

def driveUsesModule(device, modules):
    """Returns true if a drive is using a prticular module.  Only works
       for SCSI devices right now."""

    if not isinstance(modules, ().__class__) and not \
            isinstance(modules, [].__class__):
        modules = [modules]

    if device[:2] == "hd":
        return False
    rc = False
    if os.access("/tmp/scsidisks", os.R_OK):
        sdlist=open("/tmp/scsidisks", "r")
        sdlines = sdlist.readlines()
        sdlist.close()
        for l in sdlines:
            try:
                # each line has format of:  <device>  <module>
                (sddev, sdmod) = string.split(l)

                if sddev == device:
                    if sdmod in modules:
                        rc = True
                        break
            except:
                    pass
    return rc

## Check if a removable media drive (CD, USB key, etc.) has media present.
# @param device The basename of the device node.
# @return True if media is present in device, False otherwise.
def mediaPresent(device):
    try:
        fd = os.open("/dev/%s" % device, os.O_RDONLY)
    except OSError, (errno, strerror):
        # error 123 = No medium found
        if errno == 123:
            return False
        else:
            return True
    else:
        os.close(fd)
        return True

def driveIsIscsi(device):
    # ewww.  just ewww.
    if not os.path.islink("/sys/block/%s/device" %(device,)):
        return False
    target = os.readlink("/sys/block/%s/device" %(device,))
    if re.search("/platform/host[0-9]*/session[0-9]*/target[0-9]*:[0-9]*:[0-9]*/[0-9]*:[0-9]*:[0-9]*:[0-9]*", target) is not None:
        return True
    return False

def vtActivate (num):
    if rhpl.getArch() == "s390":
        return
    _isys.vtActivate (num)

def isPseudoTTY (fd):
    return _isys.isPseudoTTY (fd)

## Flush filesystem buffers.
def sync ():
    return _isys.sync ()

## Determine if a file is an ISO image or not.
# @param file The full path to a file to check.
# @return True if ISO image, False otherwise.
def isIsoImage(file):
    return _isys.isisoimage(file)

def fbinfo():
    return _isys.fbinfo()

# Get a D-Bus interface for the specified device's (e.g., eth0) properties.
# If dev=None, return a hash of the form 'hash[dev] = props_iface' that
# contains all device properties for all interfaces that NetworkManager knows
# about.
def getDeviceProperties(dev=None):
    bus = dbus.SystemBus()
    nm = bus.get_object(NM_SERVICE, NM_MANAGER_PATH)
    devlist = nm.get_dbus_method("GetDevices")()
    all = {}

    for path in devlist:
        device = bus.get_object(NM_SERVICE, path)
        device_props_iface = dbus.Interface(device, DBUS_PROPS_IFACE)

        device_interface = str(device_props_iface.Get(NM_MANAGER_IFACE, "Interface"))

        if dev is None:
            all[device_interface] = device_props_iface
        elif device_interface == dev:
            return device_props_iface

    if dev is None:
        return all
    else:
        return None

# Get the MAC address for a network device.
def getMacAddress(dev):
    if dev == '' or dev is None:
        return False

    device_props_iface = getDeviceProperties(dev=dev)
    if device_props_iface is None:
        return None

    device_macaddr = device_props_iface.Get(NM_MANAGER_IFACE, "HwAddress")
    return device_macaddr.upper()

# Determine if a network device is a wireless device.
def isWireless(dev):
    if dev == '' or dev is None:
        return False

    device_props_iface = getDeviceProperties(dev=dev)
    if device_props_iface is None:
        return None

    device_type = int(device_props_iface.Get(NM_MANAGER_IFACE, "DeviceType"))

    # from include/NetworkManager.h in the NM source code
    #    0 == NM_DEVICE_TYPE_UNKNOWN
    #    1 == NM_DEVICE_TYPE_ETHERNET
    #    2 == NM_DEVICE_TYPE_WIFI
    #    3 == NM_DEVICE_TYPE_GSM
    #    4 == NM_DEVICE_TYPE_CDMA
    if device_type == 2:
        return True
    else:
        return False

# Get the IP address for a network device.
def getIPAddress(dev):
    if dev == '' or dev is None:
       return None

    device_props_iface = getDeviceProperties(dev=dev)
    if device_props_iface is None:
        return None

    # XXX: add support for IPv6 addresses when NM can do that
    device_ip4addr = device_props_iface.Get(NM_MANAGER_IFACE, "Ip4Address")

    try:
        tmp = struct.pack('I', device_ip4addr)
        address = socket.inet_ntop(socket.AF_INET, tmp)
    except ValueError, e:
        return None

    return address

## Get the correct context for a file from loaded policy.
# @param fn The filename to query.
def matchPathContext(fn):
    return _isys.matchPathContext(fn)

## Set the SELinux file context of a file
# @param fn The filename to fix.
# @param con The context to use.
# @param instroot An optional root filesystem to look under for fn.
def setFileContext(fn, con, instroot = '/'):
    if con is not None and os.access("%s/%s" % (instroot, fn), os.F_OK):
        return (_isys.setFileContext(fn, con, instroot) != 0)
    return False

## Restore the SELinux file context of a file to its default.
# @param fn The filename to fix.
# @param instroot An optional root filesystem to look under for fn.
def resetFileContext(fn, instroot = '/'):
    con = matchPathContext(fn)
    if con:
        return setFileContext(fn, con, instroot)
    return False

def prefix2netmask(prefix):
    return _isys.prefix2netmask(prefix)

def netmask2prefix (netmask):
    prefix = 0

    while prefix < 33:
        if (prefix2netmask(prefix) == netmask):
            return prefix

        prefix += 1

    return prefix

isPAE = None
def isPaeAvailable():
    global isPAE
    if isPAE is not None:
        return isPAE

    isPAE = False
    if not iutil.isX86():
        return isPAE

    try:
        f = open("/proc/iomem", "r")
        lines = f.readlines()
        for line in lines:
            if line[0].isspace():
                continue
            start = line.split(' ')[0].split('-')[0]
            start = long(start, 16)

            if start >= 0x100000000L:
                isPAE = True
                break

        f.close()
    except:
        pass

    return isPAE

auditDaemon = _isys.auditdaemon

handleSegv = _isys.handleSegv

printObject = _isys.printObject
bind_textdomain_codeset = _isys.bind_textdomain_codeset
isVioConsole = _isys.isVioConsole