Subversion Repositories livecd

#!/bin/ash

#

# Original version from http://www.linux-live.org/

#

# modified by Urs Beyerle, PSI

# - to allow LiveCD mounted over NFS

# - add support for LiveCD on SATA devices

export PATH=.:/:/usr/sbin:/usr/bin:/sbin:/bin

. liblinuxlive

echolog "mounting /proc and /sys filesystems"

mount -t proc proc /proc

mount -t sysfs sysfs /sys

# setup DEBUGCMD variable. If debug boot option is present, call debug()

# function several times during script's execution

if [ "`cmdline_parameter debug`" ]; then DEBUGCMD="debug"; else DEBUGCMD=""; fi

$DEBUGCMD

# I have to set these variables very carefully

UNION=/union

MEMORY=/memory

#MOUNTDIR=mnt

MOUNTDIR=livecd

CHANGES=$MEMORY/changes

COPY2RAM=$MEMORY/copy2ram

IMAGES=$MEMORY/images

INITRAMDISK=$MOUNTDIR/live

# set NFSROOT if nfsroot= in boot parameter 

NFSROOT="`cmdline_value nfsroot`"

# we need cdrom support, isofs support, unionfs support, etc

modprobe_essential_modules

setup_dma

$DEBUGCMD

# load network modules, if NFSROOT is set

echolog "check for nfsroot"

if [ "$NFSROOT" != "" ]; then

   echolog "nfsroot: $NFSROOT"

   # mii maybe need by NIC

   echolog "load module mii"

   modprobe_module mii

   # detecting network card

   PCITABLE=/bin/pcitable

   NICS=`lspci -n | awk '/Class 0200/ {print $4}' | tr ':' ' ' \

   | while read x y ; do grep "0x$x.*0x$y" $PCITABLE \

   | awk '$3 !~ /"unknown"/ {print $3}' | tr -d '"' ; done`

   echolog "Found network card(s): $NICS"

   if [ -n "$NICS" ]; then

       echo $NICS | while read nic ; do

	   echo "Loading module $nic"

	   modprobe_module $nic

       done

   else

       echo "ERROR: No network card detected!"

       echo "Type in your network card driver (e.g. tg3, e1000). "

       echo "Or ask your system administrator for help."

       echo -n "Network card driver: "

       read nic

       echo "Loading module $nic"

       modprobe_module $nic

   fi

fi

$DEBUGCMD

# get DHCP lease

if [ "$NFSROOT" != "" ]; then

    # create /dev/urandom (needed by udhcpc)

    mknod /dev/urandom c 1 9

    echolog "Try to get DHCP lease on eth0"

    udhcpc --now --quit --interface=eth0 --script=/bin/udhcpc.script

    if [ $? -ne 0 ]; then

	echo "ERROR: couldn't get DHCP lease, trying again"

	udhcpc --now --quit --interface=eth0 --script=/bin/udhcpc.script

	if [ $? -ne 0 ]; then

	    echo "ERROR: couldn't get DHCP lease, trying eth1"

	    udhcpc --now --quit --interface=eth1 --script=/bin/udhcpc.script

	    if [ $? -ne 0 ]; then

		echo "ERROR: couldn't get DHCP lease, trying again eth1"

		udhcpc --now --quit --interface=eth1 --script=/bin/udhcpc.script

		if [ $? -ne 0 ]; then

		    echo "ERROR: can't get DHCP lease on eth0 and eth1"

		fi

	    fi

	fi

    fi

fi

$DEBUGCMD

# we need nfs modules loaded, if NFSROOT is set

if [ "$NFSROOT" != "" ]; then

    modprobe_nfs_modules

fi

$DEBUGCMD

# $UNION will be used as a root directory, livecd modules will be added soon.

echolog "setup union on $UNION"

mkdir -p $UNION

mkdir -p $MEMORY

CHANGESDEV="`cmdline_value changes`"

if [ "$CHANGESDEV" != "" ]; then

   echo "mounting $CHANGESDEV to $MEMORY"

   mount_device $CHANGESDEV $MEMORY

else false; fi

# mount tmpfs only in the case when changes= boot parameter was empty

# or we were not able to mount the storage device

if [ $? -ne 0 ]; then mount -t tmpfs -o "size=80%" tmpfs $MEMORY; fi

mkdir -p $CHANGES

mkdir -p $COPY2RAM

mkdir -p $IMAGES

mount -t unionfs -o dirs=$CHANGES=rw unionfs $UNION

if [ $? -ne 0 ]; then fatal "can't setup union in /union directory"; fi

$DEBUGCMD

# try to find livecd data directory. If not found, try modprobing

# USB and SATA kernel modules and repeat the find procedure again

echolog "looking for data modules"

DATA="`find_live_data_dir $MOUNTDIR`";

# if [ "$DATA" = "" ]; then modprobe_usb_modules; DATA="`find_live_data_dir $MOUNTDIR`"; fi

if [ "$DATA" = "" ]; then modprobe_usb_sata_modules; DATA="`find_live_data_dir $MOUNTDIR`"; fi

if [ "$DATA" = "" ]; then fatal "Data for LiveCD not found. Are you using SCSI?"; fi

echolog "LiveCD found in: $DATA"

$DEBUGCMD

# If toram or copy2ram boot parameter is present, copy all .mo modules to RAM.

# (skip modules from /optional/ which are not listed in load= boot option)

# Finaly modify DATA variable so it will point to correct directory

if [ "`cmdline_parameter toram`" != "" -o "`cmdline_parameter copy2ram`" != "" ]; then

   echolog "copying modules to RAM, this may take some time"

   copy_to_ram $DATA $COPY2RAM

   cd_autoeject 1

   umount $DATA 2>/dev/null

   if [ $? -ne 0 ]; then umount `dirname $DATA` 2>/dev/null; fi

   DATA=$COPY2RAM

   cd_autoeject 0

fi

mkdir -p $UNION/boot

mount -o bind $DATA $UNION/boot

$DEBUGCMD

# DATA contains path to the base directory of all .mo images which need

# to be mounted and inserted into live filesystem. Do it now.

echolog "inserting all modules and creating live filesystem"

union_insert_modules $UNION $DATA $IMAGES

$DEBUGCMD

echo "copying rootchanges"

copy_rootchanges $DATA $UNION

$DEBUGCMD

echo "creating /etc/fstab"

activate_fstab $UNION

# More likely these directories aren't there.

# Even if they are, this won't hurt.

mkdir -p $UNION/proc

mkdir -p $UNION/sys

mkdir -p $UNION/tmp

mkdir -p $UNION/dev

$DEBUGCMD

# Union contains all the files and directories unioned from all modules.

# Change root directory to it, and move initrd's root to /livecd/live/initramdisk

# Finaly execute /sbin/init to start the distribution.

echolog "changing root directory..."

cd $UNION

mkdir -p $INITRAMDISK

umount /sys # we won't need it anymore

if [ ! -e $UNION/dev/console ]; then mknod $UNION/dev/console c 5 1; fi

if [ -x $UNION/usr/sbin/chroot ];

  then CHROOT=/usr/sbin/chroot

  else CHROOT=/usr/bin/chroot

fi

echolog "End of linux live scripts"

# pure magic ;-)

cat $UNION/bin/true >/dev/null

$DEBUGCMD

pivot_root . $INITRAMDISK

exec $CHROOT . sbin/init <dev/console >dev/console 2>&1; fi

header "ERROR!"

echolog "You are not supposed to be here, something went wrong!"

echolog "Even Ctrl+Alt+Del won't help you in kernel panic."