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|
#!/bin/sh
# Commands used:
# modprobe grep cat
# This script defines an alternative
# mount_root() function for
# /sbin/init to run
# method of checking for root
TEST_for_ROOT(){
if [ -d /mnt/ram -a -f /mnt/ram.cpio.gz -a \
-x /mnt/etc/init.d/ramload.sh ]
then
return 0
else
return 1
fi
}
# default values
rootfstype=auto
root=ask
found=no
ROOT=
# Generate the list of block devices/partitions available
try_block_list(){
for i
do
case $i in
# No ram devices or floppy
*fd* | *ram* )
continue
;;
esac
[ -f $i ] || continue
name=${i%/dev}
name=${name##*/}
dev=$(cat $i)
major=${dev%:*}
minor=${dev#*:}
if [ "$root" = "ask" ]
then
echo -n "Try /dev/$name?[Yn]"
read ans
case $ans in
n | N )
continue
;;
esac
fi
mount_dev_and_check $name $major $minor && return 0
done
return 1
}
# Mount device and look for some
# "signature" files
mount_dev_and_check(){
name=$1
major=$2
minor=$3
mknod /dev2/$name b $major $minor
if mount -nrt $rootfstype /dev2/$name /mnt 2>/dev/null
then
if TEST_for_ROOT
then
ROOT=/dev/$name
rootdev=$(($major*256+$minor))
echo $rootdev > /proc/sys/kernel/real-root-dev
found=yes
return 0
fi
umount -n /mnt
fi
return 1
}
# This mounts the root device using the routines above
mount_root() {
mount -nt proc proc /proc
mount -nt sysfs sysfs /sys
mount -nt tmpfs tmpfs /dev2
#Get the values of the various important parameters
for i in $(cat /proc/cmdline); do
case $i in
root=*)
root=${i#root=}
;;
rootfstype=*)
rootfstype=${i#rootfstype=}
;;
esac
done
# There is no harm in loading all the FSTYPES
# as they will be useful later on too!
sIFS="$IFS"
IFS=','
set $FSTYPES
IFS="$sIFS"
for fs
do
/sbin/modprobe -k $fs 2> /dev/null
case "$fs" in
*dos* | *fat* )
# This is required for the mount command
/sbin/modprobe -k nls_cp437 2> /dev/null
/sbin/modprobe -k nls-iso8859-1 2> /dev/null
;;
esac
done
case $root in
/dev/*)
name=${root##/dev/}
try_block_list /sys/block/$name/dev /sys/block/*/$name/dev
;;
ask | auto )
try_block_list /sys/block/*/dev /sys/block/*/*/dev
;;
esac
umount -n /dev2
umount -n /sys
umount -n /proc
if [ "$found" != "yes" ]
then
echo "Could not mount the root file system"
echo "Giving you a shell"
exec sh
fi
}
|
