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mkboot
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2009-02-16
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#!/bin/sh
# mkboot: make the system bootable
# Debian GNU/Linux
# Copyright 1996-1997 Guy Maor <maor@debian.org>
# This is free software; see the GNU General Public License version 2
# or later for copying conditions. There is NO warranty.
set -e
PATH=$PATH:/sbin:/usr/sbin
# basic devfsd support
if [ -e /dev/.devfsd ]; then
FLOPPY=/dev/floppy/0
else
FLOPPY=/dev/fd0
fi
# root partition
if mount | grep -q "^proc " && [ -e /proc/cmdline ]; then
rootpart=$(grep -o "root=[^ ]*" /proc/cmdline | cut -d \= -f 2)
else
which rdev >/dev/null && rootpart=$(rdev | cut -d ' ' -f 1)
fi
# temporary directory
tmpdir=${TMPDIR-/tmp}
# check whether ELILO is installed
elilocheck() {
printf "\nChecking for ELILO..."
if [ -f /etc/elilo.conf ] && [ -x /usr/sbin/elilo ]; then
echo "Yes"
return 0
fi
echo "No"
return 1
}
# check whether SILO is installed
silocheck() {
printf "\nChecking for SILO..."
if [ -f /etc/silo.conf ] && [ -x /sbin/silo ]; then
echo "Yes"
return 0
fi
echo "No"
return 1
}
# check whether GRUB is installed
grubcheck () {
if ! which update-grub >/dev/null && ! which grub-install >/dev/null; then return 1; fi
}
# check whether Yaboot is installed
yabootcheck () {
[ -f /etc/yaboot.conf ] && [ -x /usr/sbin/ybin ] && return 0 || return 1
}
# check whether Arcboot is installed
arcbootcheck () {
[ -f /etc/arcboot.conf ] && [ -x /usr/sbin/arcboot ] && return 0 || return 1
}
# check whether LILO is installed
lilocheck () {
printf "\nChecking for LILO..."
if [ $(whoami) != root ] ; then
echo "Only root can check for LILO"
return 1;
fi
if [ ! -f /etc/lilo.conf ] || [ ! -x /sbin/lilo ] ; then
echo "No"
return 1;
fi
bootpart=$(perl -ne 'print $1 if /^\s*boot\s*=\s*(\S*)/' /etc/lilo.conf)
if [ -z "$bootpart" ] ; then
# lilo defaults to current root when 'boot=' is not present
bootpart=$rootpart
fi
if [ ${bootpart#/dev/md} != $bootpart ] ||
[ ${bootpart#/dev/evms/md} != $bootpart ]; then
echo " - on software RAID device $bootpart - assuming LILO is installed and working."
return 0;
fi
if ! dd if=$bootpart ibs=16 count=1 2>&- | grep -q LILO ; then
printf "\nYes, but I couldn't find a LILO signature on $bootpart\n"
echo "Check your /etc/lilo.conf, or run /sbin/lilo by hand."
return 1;
fi
echo "Yes, on $bootpart"
return 0;
}
# check whether PALO is installed
palocheck() {
printf "\nChecking for PALO..."
if [ -f /etc/palo.conf ] && [ -x /sbin/palo ]; then
echo "Yes"
return 0
fi
echo "No"
return 1
}
# make a lilo boot disk
makelilo () {
(
b=$tmpdir/boot$$
trap "set +e; cd /; umount $FLOPPY; rmdir $b" EXIT
mkdir $b
mke2fs -q $FLOPPY
mount -t ext2 $FLOPPY $b
if [ -e /boot/boot.b ]; then
cp /boot/boot.b $b/boot.b
fi
cp $1 $b/vmlinuz
# if a symbolic link, look for the real file
kfile=`readlink -f $1`
# see if we need an "initrd=" line in lilo.conf
kdir=`dirname $kfile`
if [ $kdir = . ]; then kdir=$PWD # full path
elif [ $kdir = boot ]; then kdir=/boot; kfile="/$kfile"; fi
# make sure directory exists
if [ -d $kdir ]; then
# extract version
case $kfile in
*-*) kvers=${kfile#*-} ;;
*) kvers="" ;;
esac
# look for matching initrd.img
if [ "$kvers" = "" ]; then ifile="$kdir"/initrd.img
else ifile="$kdir"/initrd.img-$kvers ; fi
#
if [ ! -f $ifile ]; then ifile=""; fi
else
kdir="" ; ifile=""
fi
# kfile is now the full path to the kernel image, and
# ifile is now the initrd.img that matches the kernel, or null
#
echo "Kernel is at $kfile in $kdir"
if [ "$ifile" != "" ]; then echo "Matching initrd image is $ifile";fi
#
lilo_conf="# floppy lilo.conf
boot = $FLOPPY
install = boot.b
map = map"
state=G
usesinitrd=n
# examine /etc/lilo.conf
while read line
do
case $line in
"#"* | "" ) continue ;; # skip comments and blank lines
*boot*=* | *root*=* | *install*=* ) continue ;;
*map*=* | *message*=* ) continue # skip these files as well
;;
*image*=* ) if [ $state = L ]; then
break
fi # done
#
case $line in
*$1 ) kimg=`echo ${line#*=}`
state=L # found correct kernel
;;
*linu*) kimg=`echo ${line#*=}`
# see if this is the right Linux kernel
if [ `ls -l $kimg |
awk '{print $NF}'` = $kfile ]; then
state=L # found right kernel
else
state=I # Ignore wrong kernel
fi
;;
* ) state=I # Ignore this stanza
;;
esac
#
if [ $state = L ]; then
lilo_conf="$lilo_conf
# kernel-specific:
$line"
fi
;;
*other*=* ) state=I # ignore non-Linux stanza
;;
* ) if [ $state != I ]; then
lilo_conf=`printf "$lilo_conf\n$line\n"`
fi
#
case $line in
*initrd*=* ) lcinitrd=`ls -l ${line#*=} |
awk '{print $NF}'`
if [ $lcinitrd = "$ifile" ]; then
usesinitrd=y
fi
;;
esac
;;
esac
done < /etc/lilo.conf
#
lilo_conf=`printf "$lilo_conf\nroot = $rootpart\n"`
#
if [ $state = L ]; then
echo "Found kernel image $kimg in existing /etc/lilo.conf"
if [ "$liloOK" != n ] && [ $usesinitrd = y ] && [ "$ifile" != "" ]; then
echo " and the correct initrd.img as well."
problems=n
elif [ "$liloOK" != n ] && [ $usesinitrd = n ] && [ "$ifile" = "" ]; then
problems=n # no initrd needed
elif [ "$liloOK" != n ] && [ $usesinitrd = n ] && [ "$ifile" != "" ]; then
echo " but it does not invoke $ifile ."
problems=y
elif [ "$liloOK" = n ] && [ $usesinitrd = y ]; then
echo " and the correct initrd.img as well,"
echo " but there were problems in installing from it."
problems=y
else
echo "but it does not mention the required initrd.img ."
problems=y
fi
else
echo "Could not find the requested kernel in your"
echo " current /etc/lilo.conf ."
problems=y
fi
#
if [ $problems = n ]; then
echo "Your current /etc/lilo.conf looks good, and can be used"
echo " as the basis for the boot-floppy lilo.conf."
else
echo "The mkboot script can probably do better."
fi
sleep 8
#
echo
echo "Here is the proposed lilo.conf:"
echo
echo "$lilo_conf"
echo
echo "You can install the boot-loader from this best guess,"
echo "or you can try to install from a \`vanilla\' lilo.conf ."
echo
reply=""
while [ "$reply" = "" ]
do
printf "Which do you choose? (Enter B for best, V for vanilla): "
read reply
done
#
if [ $reply = B ] || [ $reply = b ]; then
echo "Installing the best-guess lilo.conf..."
cd $b
echo "$lilo_conf" > lilo.conf
else
echo "Installing the vanilla lilo.conf..."
cd $b
cat > lilo.conf <<- EOF
lba32
boot = $FLOPPY
install = boot.b
map = map
compact
prompt
timeout = 50
read-only
image = vmlinuz
label = linux
root = $rootpart
EOF
fi
#
lilo -C lilo.conf
cat <<EOF
If you need to modify the floppy's lilo.conf, run the following:
mount $FLOPPY /mnt
cd /mnt
vi lilo.conf # edit the file
lilo -C lilo.conf # run lilo on floppy
cd
umount $FLOPPY
EOF
)
}
# make a simple boot disk
makesimple () {
(
dd if=$1 of=$FLOPPY
rdev $FLOPPY $rootpart
rdev -R $FLOPPY 1
)
}
# make a boot disk
makedisk () {
kernel=${1:-/vmlinuz}
if [ ! -r $kernel ] ; then
echo "Error: Can't read $kernel."
exit 1
fi
boottype="lilo"
if [ $(whoami) != root ] ; then
echo "Since you don't have root permissions, I can't put LILO on the diskette."
echo "I will make a non-LILO diskette instead, but it won't be as useful. You"
echo "can hit <Ctrl-C> to cancel."
boottype="simple"
fi
printf "\nInsert a floppy diskette into your boot drive, and press <Return>. "
read input
diskok=0
while [ "$diskok" != 1 ] ; do
printf "\nCreating a $boottype bootdisk...\n"
make$boottype $kernel
if [ $? -eq 0 ] ; then
diskok=1
else
printf "\nThere was a problem creating the boot diskette. Please make sure that\n"
echo "you inserted the diskette into the correct drive and that the diskette"
echo "is not write-protected."
printf "\nWould you like to try again? (y/n) "
read input
if [ "$input" != "y" ] ; then
return 1
fi
fi
done
echo "...Success."
return 0
}
usage="$0 [-r rootpartition] [-i] [-d device] [kernel]"
while getopts "r:id:h-" opt ; do
case "$opt" in
r) rootpart="$OPTARG" ;;
i) installkernel=1 ;;
d) FLOPPY="$OPTARG" ;;
h) echo $usage ; exit 0 ;;
-) break ;;
*) echo $usage 1>&2 ; exit 1 ;;
esac
done
shift $(($OPTIND - 1))
if [ "$installkernel" ] ; then
echo "In order to use the new kernel image you have just installed, you"
echo "will need to reboot the machine. First, however, you will need to"
echo "either make a bootable floppy diskette, re-run LILO, or have GRUB"
echo "installed."
if elilocheck; then
printf "\nShould I run /usr/sbin/elilo? (y/N) "
read input
if [ "$input" = "y" ] ; then
/usr/sbin/elilo && exit 0
echo "There was a problem running /usr/sbin/elilo."
fi
fi
if grubcheck; then
printf "\nGRUB is installed. To automatically switch to new kernels, point your\n"
echo "default entry in menu.lst to $1"
exit 0
elif yabootcheck; then
printf "\nYaboot is installed. To automatically switch to new kernels, point your\n"
echo "default entry in /etc/yaboot.conf to $1"
exit 0
elif arcbootcheck; then
printf "\nArcboot is installed. To automatically switch to new kernels, point your\n"
echo "default entry in /etc/arcboot.conf to $1"
exit 0
fi
if lilocheck; then
liloOK=y
printf "\nShould I run /sbin/lilo? (y/N) "
read input
if [ "$input" = "y" ] ; then
/sbin/lilo && exit 0
echo "There was a problem running /sbin/lilo."
liloOK=n
fi
fi
if silocheck; then
printf "\nSILO is installed. To automatically switch to new kernels, point your\n"
echo "default entry in silo.conf to $1"
exit 0
fi
if palocheck; then
printf "\nPALO is installed. To automatically switch to new kernels, point your\n"
echo "default entry in palo.conf to $1"
exit 0
fi
printf "\nShould I make a bootdisk? (y/N) "
read input
if [ "$input" = "y" ] ; then
makedisk $1 && exit 0
fi
printf "\nWARNING: Your system is probably unbootable now. After correcting any\n"
echo "problems, rerun this script with the command \`mkboot -i'."
exit 1
fi
makedisk $1