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|
#!/bin/sh
# *
# * updategrub
# *
# * Copyright (C) 2005 IBM Corporation
# *
# * Authors:
# * Stefan Berger <stefanb@us.ibm.com>
# *
# * 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, version 2 of the
# * License.
# *
# *
#
if [ -z "$runbash" ]; then
runbash="1"
export runbash
exec sh -c "bash $0 $*"
exit
fi
# Show usage of this program
usage ()
{
echo "Usage: $0 <policy name> <root of xen repository>"
echo ""
echo "<policy name> : The name of the policy, i.e. xen_null"
echo "<root of xen repository> : The root of the XEN repositrory."
echo ""
}
# This function sets the global variable 'linux'
# to the name of the linux kernel that was compiled
# For now a pattern should do the trick
getLinuxVersion ()
{
path=$1
linux=""
for f in $path/linux-*-xen0 ; do
versionfile=$f/include/linux/version.h
if [ -r $versionfile ]; then
lnx=`cat $versionfile | \
grep UTS_RELEASE | \
awk '{ \
len=length($3); \
print substr($3,2,len-2) }'`
fi
if [ "$lnx" != "" ]; then
linux="[./0-9a-zA-z]*$lnx"
return;
fi
done
#Last resort.
linux="vmlinuz-2.[45678].[0-9]*[.0-9]*-xen0$"
}
#Return where the grub.conf file is.
#I only know of one place it can be.
findGrubConf()
{
grubconf="/boot/grub/grub.conf"
if [ -w $grubconf ]; then
return 1
fi
return 0
}
#Update the grub configuration file.
#Search for existing entries and replace the current
#policy entry with the policy passed to this script
#
#Arguments passed to this function
# 1st : the grub configuration file
# 2nd : the binary policy file name
# 3rd : the name or pattern of the linux kernel name to match
#
# The algorithm here is based on pattern matching
# and is working correctly if
# - under a title a line beginning with 'kernel' is found
# whose following item ends with "xen.gz"
# Example: kernel /xen.gz dom0_mem=....
# - a module line matching the 3rd parameter is found
#
updateGrub ()
{
grubconf=$1
policyfile=$2
linux=$3
tmpfile="/tmp/new_grub.conf"
cat $grubconf | \
awk -vpolicy=$policyfile \
-vlinux=$linux '{ \
if ( $1 == "title" ) { \
kernelfound = 0; \
if ( policymaycome == 1 ){ \
printf ("\tmodule %s%s\n", path, policy); \
} \
policymaycome = 0; \
} \
else if ( $1 == "kernel" ) { \
if ( match($2,"xen.gz$") ) { \
path=substr($2,1,RSTART-1); \
kernelfound = 1; \
} \
} \
else if ( $1 == "module" && \
kernelfound == 1 && \
match($2,linux) ) { \
policymaycome = 1; \
} \
else if ( $1 == "module" && \
kernelfound == 1 && \
policymaycome == 1 && \
match($2,"[0-9a-zA-Z]*.bin$") ) { \
printf ("\tmodule %s%s\n", path, policy); \
policymaycome = 0; \
kernelfound = 0; \
dontprint = 1; \
} \
else if ( $1 == "" && \
kernelfound == 1 && \
policymaycome == 1) { \
dontprint = 1; \
} \
if (dontprint == 0) { \
printf ("%s\n", $0); \
} \
dontprint = 0; \
} END { \
if ( policymaycome == 1 ) { \
printf ("\tmodule %s%s\n", path, policy); \
} \
}' > $tmpfile
if [ ! -r $tmpfile ]; then
echo "Could not create temporary file! Aborting."
exit -1
fi
mv -f $tmpfile $grubconf
}
if [ "$1" == "" -o "$2" == "" ]; then
usage
exit -1
fi
if [ "$1" == "-?" ]; then
usage
exit 0
fi
policy=$1
policyfile=$policy.bin
getLinuxVersion $2
findGrubConf
ERR=$?
if [ $ERR -eq 0 ]; then
echo "Could not find grub.conf. Aborting."
exit -1
fi
updateGrub $grubconf $policyfile $linux
|
