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#!/usr/bin/python
#
# Check to see whether it looks like GRUB or LILO is the boot loader
# being used on the system.
#
# Jeremy Katz <katzj@redhat.com>
# Peter Jones <pjones@redhat.com>
#
# Copyright 2001,2005 Red Hat, Inc.
#
# This software may be freely redistributed under the terms of the GNU
# library public license.
#
# You should have received a copy of the GNU Library Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
import os
import string
from util import getDiskPart
import iutil
grubConfigFile = "/etc/grub.conf"
liloConfigFile = "/etc/lilo.conf"
yabootConfigFile = "/etc/yaboot.conf"
siloConfigFile = "/etc/silo.conf"
def getRaidDisks(raidDevice, storage, raidLevel=None, stripPart=1):
rc = []
if raidLevel is not None:
try:
raidLevel = "raid%d" % (int(raidLevel),)
except ValueError:
pass
try:
f = open("/proc/mdstat", "r")
lines = f.readlines()
f.close()
except:
return rc
for line in lines:
fields = string.split(line, ' ')
if fields[0] == raidDevice:
if raidLevel is not None and fields[3] != raidLevel:
continue
for field in fields[4:]:
if string.find(field, "[") == -1:
continue
dev = string.split(field, '[')[0]
if len(dev) == 0:
continue
if stripPart:
disk = getDiskPart(dev, storage)[0]
rc.append(disk)
else:
rc.append(dev)
return rc
def getBootBlock(bootDev, instRoot, storage, seekBlocks=0):
"""Get the boot block from bootDev. Return a 512 byte string."""
block = " " * 512
if bootDev is None:
return block
# get the devices in the raid device
if bootDev[5:7] == "md":
bootDevs = getRaidDisks(bootDev[5:], storage)
bootDevs.sort()
else:
bootDevs = [ bootDev[5:] ]
# FIXME: this is kind of a hack
# look at all of the devs in the raid device until we can read the
# boot block for one of them. should do this better at some point
# by looking at all of the drives properly
for dev in bootDevs:
try:
fd = os.open("%s/dev/%s" % (instRoot, dev), os.O_RDONLY)
if seekBlocks > 0:
os.lseek(fd, seekBlocks * 512, 0)
block = os.read(fd, 512)
os.close(fd)
return block
except:
pass
return block
# takes a line like #boot=/dev/hda and returns /dev/hda
# also handles cases like quoted versions and other nonsense
def getBootDevString(line):
dev = string.split(line, '=')[1]
dev = string.strip(dev)
dev = string.replace(dev, '"', '')
dev = string.replace(dev, "'", "")
return dev
def getBootDevList(line):
devs = string.split(line, '=')[1]
rets = []
for dev in devs:
dev = getBootDevString("=%s" % (dev,))
rets.append(dev)
return string.join(rets)
def getBootloaderTypeAndBoot(instRoot, storage):
haveGrubConf = 1
haveLiloConf = 1
haveYabootConf = 1
haveSiloConf = 1
bootDev = None
# make sure they have the config file, otherwise we definitely can't
# use that bootloader
if not os.access(instRoot + grubConfigFile, os.R_OK):
haveGrubConf = 0
if not os.access(instRoot + liloConfigFile, os.R_OK):
haveLiloConf = 0
if not os.access(instRoot + yabootConfigFile, os.R_OK):
haveYabootConf = 0
if not os.access(instRoot + siloConfigFile, os.R_OK):
haveSiloConf = 0
if haveGrubConf:
bootDev = None
for (fn, stanza) in [ ("/etc/sysconfig/grub", "boot="),
(grubConfigFile, "#boot=") ]:
try:
f = open(instRoot + fn, "r")
except:
continue
# the following bits of code are straight from checkbootloader.py
lines = f.readlines()
f.close()
for line in lines:
if line.startswith(stanza):
bootDev = getBootDevString(line)
break
if bootDev is not None:
break
if iutil.isEfi():
return ("GRUB", bootDev)
if bootDev is not None:
block = getBootBlock(bootDev, instRoot, storage)
# XXX I don't like this, but it's what the maintainer suggested :(
if string.find(block, "GRUB") >= 0:
return ("GRUB", bootDev)
if haveLiloConf:
f = open(instRoot + liloConfigFile, "r")
lines = f.readlines()
for line in lines:
if line[0:5] == "boot=":
bootDev = getBootDevString(line)
break
block = getBootBlock(bootDev, instRoot, storage)
# this at least is well-defined
if block[6:10] == "LILO":
return ("LILO", bootDev)
if haveYabootConf:
f = open(instRoot + yabootConfigFile, "r")
lines = f.readlines()
for line in lines:
if line[0:5] == "boot=":
bootDev = getBootDevList(line)
if bootDev:
return ("YABOOT", bootDev)
if haveSiloConf:
bootDev = None
# We've never done the /etc/sysconfig/silo thing, but maybe
# we should start...
for (fn, stanza) in [ ("/etc/sysconfig/silo", "boot="),
(grubConfigFile, "#boot=") ]:
try:
f = open(instRoot + fn, "r")
except:
continue
lines = f.readlines()
f.close()
for line in lines:
if line.startswith(stanza):
bootDev = getBootDevString(line)
break
if bootDev is not None:
break
if bootDev is not None:
# XXX SILO sucks just like grub.
if getDiskPart(bootDev, storage)[1] != 3:
block = getBootBlock(bootDev, instRoot, storage, 1)
if block[24:28] == "SILO":
return ("SILO", bootDev)
return (None, None)
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