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#!/bin/sh
#
# $Source: /cvsroot/bootcd/bootcd/bootcdproberoot,v $
# $Id: bootcdproberoot,v 1.7 2006-11-27 16:36:34 bs Exp $
# author: Carsten Dinkelmann <din@foobar-cpa.de>
# Bernd Schumacher <bernd.schumacher@hp.com>
# start: 25.01.2005
# topic: try to detect the root device and set it as new
# wait for usb, but stop waiting if device is recognized
#
# devices: device:major:minor
devices="hda:3:0 hdb:3:64 hdc:22:0 hdd:22:64 hde:33:0 hdf:33:64 hdg:34:0 hdf:34:64 scd0:11:0 scd1:11:2 scd2:11:3 scd3:11:4 scd4:11:5 scd5:11:6 scd6:11:7 scd7:11:8"
# search for this file on the cd
bootcdfile="/etc.ro/bootcd/bootcd2disk.conf"
################### nothing to configure behind this line #####################
devs=""
rootdev=""
#oldroot=$(cat /proc/sys/kernel/real-root-dev)
#echo "bootcdproberoot: /proc/cmdline=\"$(cat /proc/cmdline)\"" >&2
# next line gets the last "root=*"
cmdlineroot=$(cat /proc/cmdline | sed "s/^.*\<root=\([^ ]*\)\>.*$/\1/")
getdevice()
{
ret=""
for i in $*; do
j=$(echo " $devices " | sed "s/^.* \($i[^ ]*\) .*$/\1/" |
grep -v "$devices")
if [ "$j" ]; then
[ "$ret" ] && ret="$ret $j" || ret="$j"
else
echo "bootcdproberoot: Can't find major and minor for device \"$i\" ... please add to /usr/share/bootcd/bootcdproberoot!" >&2
fi
done
echo "$ret"
}
#echo "cmd=\"getdevice hda\" expect=\"hda:3:0\" result=\"$(getdevice hda)\""
#echo "cmd=\"getdevice scd1\" expect=\"scd1:11:2\" result=\"$(getdevice scd1)\""
#echo "cmd=\"getdevice scd7\" expect=\"scd7:11:8\" result=\"$(getdevice scd7)\""
#echo "cmd=\"getdevice bad\" expect=\"\" result=\"$(getdevice bad)\""
#echo "cmd=\"getdevice scd1 scd2 hda\" expect=\"scd1:11:2 scd2:11:3 hda:3:0\" result =\"$(getdevice scd1 scd2 hda)\""
#exit 0
# gethd - search all hd* which inlude ide-cdrom in driver
gethd()
{
echo "bootcdproberoot: try to find ide-cdrom: " >&2
ret=""
for i in $(cd /proc/ide; ls -d hd*); do
j=$(cat /proc/ide/$i/driver)
if [ "$(echo "$j" |grep "ide-cdrom")" ]; then
echo "bootcdproberoot: - $i ... found cdrom ($j) " >&2
[ "$ret" ] && ret="$ret $i" || ret="$i"
else
echo "bootcdproberoot: - $i ... no cdrom ($j) " >&2
fi
done
echo "$ret"
}
#gethd
#exit 0
# getscd - simple grep for scsi-cdroms ;-)
getscd()
{
echo "bootcdproberoot: try to find scsi-cdrom: " >&2
ret=""
j=$(cat /proc/scsi/scsi |grep "Type:[[:space:]]*CD-ROM" |wc -l)
i=0
while [ $i -lt $j ]; do
echo "bootcdproberoot: - scd$i ... found cdrom " >&2
[ "$ret" ] && ret="$ret scd$i" || ret="scd$i"
i=$(expr $i + 1)
done
echo "$ret"
}
real2device()
{
i=$(($1>>8))
j=$(($1-($i<<8)))
echo "real:$i:$j"
}
#echo "cmd=\"real2device 769\" expect=\"real:3:1\" result=\"$(real2device 769)\""
#exit 0
device2real()
{
echo $((($(echo $1| cut -d":" -f2) <<8)+ $(echo $1| cut -d":" -f3)))
}
#echo "cmd=\"device2real hda:3:1\" expect=\"769\" result=\"$(device2real hda:3:1)\""
#exit 0
for try in 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1; do
if [ "$cmdlineroot" = "auto" ]; then
if [ $try -eq 20 ]; then
echo "bootcdproberoot: cmdlineroot=auto - searching ..." >&2
fi
devs=$(getdevice $(gethd))
devs="$devs $(getdevice $(getscd))"
elif [ "$(echo "$cmdlineroot" | grep "^[0123456789]*$")" ]; then
if [ $try -eq 20 ]; then
echo "bootcdproberoot: cmdlineroot=hex \"0x$cmdlineroot\"" >&2
devs="$(real2device $((0x$cmdlineroot)))"
fi
else
# cmdlineroot could be /dev/hda3 and we have no info in devices
[ $try -eq 20 ] && echo "bootcdproberoot: will do usbwait" >&2
fi
[ "$devs" ] && echo "bootcdproberoot: search on this devices: $devs" >&2
mkdir -p /mnt /dev2
for d in $devs; do
devname=$(echo $d| cut -d":" -f1)
major=$(echo $d| cut -d":" -f2)
minor=$(echo $d| cut -d":" -f3)
if [ "$cmdlineroot" = "auto" ]; then
# try to mount the selected devices to /mnt and look for bootcdfile
# create device
rm -f /dev2/$devname
mknod /dev2/$devname b $major $minor
ret=$(mount -t iso9660 -n /dev2/$devname /mnt >/dev/null 2>&1; echo $?)
if [ $ret != 0 ]; then
echo "bootcdproberoot: - not found on $d (not mountable)" >&2
else
if [ -e "/mnt/$bootcdfile" ]; then
echo "bootcdproberoot: - found bootcd on $d" >&2
if [ -e "/scripts/init-premount/runbootcdproberoot" ]; then
# initramfs-tools
ROOT=/dev2/$devname
echo "ROOT=$ROOT" >/conf/param.conf
else
# initrd-tools
real=$(device2real $d)
echo "bootcdproberoot: found bootcd on $d; set $real as new root!" >&2
echo $real >/proc/sys/kernel/real-root-dev
fi
umount /mnt
break 2
else
echo "bootcdproberoot: - not found on $d" >&2
umount /mnt
fi
fi
else
# no mount, we know nothing about filesystems; only check /proc/partitions
if [ "$(cat /proc/partitions | grep "^ *$major *$minor ")" ]; then
echo "bootcdproberoot: found given device in /proc/partitions" >&2
break 2
else
echo "bootcdproberoot: given device not found" >&2
fi
fi
done
[ $try -eq 20 ] && echo -n "bootcdproberoot: waiting for usb " >&2
echo -n "$try " >&2
sleep 1
done
echo "" >&2
# For DEBUG enable /bin/sh
#/bin/sh
|
