scripts/lvm2create_initrd/lvm2create_initrd - manifest_repos/lvm2 - Git at Google

 #!/bin/bash
 #
 # lvm2create_initrd
 #
 # Miguel Cabeca
 # cabeca (at) ist (dot) utl (dot) pt
 #
 # Inspiration to write this script came from various sources
 #
 # Original LVM lvmcreate_initrd: ftp://ftp.sistina.com/pub/LVM/1.0/
 # Kernel initrd.txt: http://www.kernel.org/
 # EVMS INSTALL.initrd & linuxrc: http://evms.sourceforge.net/
 # Jeffrey Layton's lvm2create_initrd: http://poochiereds.net/svn/lvm2create_initrd/
 # Christophe Saout's initrd & linuxrc: http://www.saout.de/misc/
 #
 # This script was only tested with kernel 2.6 with everything required to boot
 # the root filesystem built-in (not as modules). Ex: SCSI or IDE, RAID, device mapper
 # It does not support devfs as it is deprecated in the 2.6 kernel series
 #
 # It needs lvm2 tools, busybox, pivot_root, MAKEDEV
 #
 # It has been tested on Debian sid (unstable) only
 #
 # Changelog
 # 26/02/2004	Initial release -- Miguel Cabeca
 # 27/02/2004	Removed the BUSYBOXSYMLINKS var. The links are now determined at runtime.
 #		some changes in init script to call a shell if something goes wrong. -- Miguel Cabeca
 # 19/04/2004    Several small changes. Pass args to init so single user mode works. Add some
 #               PATH entries to /sbin/init shell script so chroot works without /usr mounted. Remove
 #               mkdir /initrd so we don't cause problems if root filesystem is corrupted. -- Jeff Layton
 # 15/05/2004	initial support for modules, create lvm.conf from lvm dumpconfig, other cleanups -- Jeff Layton
 # 14/11/2006	Update handling of ldd output to handle hardcoded library links and virtual dll linux-gate.
 #		Add support for Gentoo-style MAKEDEV. Remove hardcoded BINUTILS paths -- Douglas Mayle
 #
 # Copyright Miguel Cabeca, Jeffrey Layton, 2004
 #
 #    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; either version 2 of the License, or
 #    (at your option) any later version.
 #
 #    This program is distributed in the hope that it will be useful,
 #    but WITHOUT ANY WARRANTY; without even the implied warranty of
 #    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 #    GNU General Public License for more details.
 #
 #    You should have received a copy of the GNU General Public License
 #    along with this program; if not, write to the Free Software
 #    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 #
 # $Id$

 TMPMNT=/tmp/mnt.$$
 DEVRAM=/tmp/initrd.$$

 # set defaults
 BINFILES=${BINFILES:-"`which lvm` `which bash` `which busybox` `which pivot_root`"}
 BASICDEVICES=${BASICDEVICES:-"std consoleonly fd"}
 BLOCKDEVICES=${BLOCKDEVICES:-"md hda hdb hdc hdd sda sdb sdc sdd"}
 MAKEDEV=${MAKEDEV:-"debian"}

 # Uncomment this if you want to disable automatic size detection
 #INITRDSIZE=4096

 PATH=/bin:/sbin:/usr/bin:/usr/sbin:$PATH

 usage () {
 	echo "Create an initial ramdisk image for LVM2 root filesystem"
 	echo "$cmd: [-h] [-v] [-c lvm.conf] [-m modulelist] [-e extrafiles] -r [raiddevs] [-R mdadm.conf] [-M style] [kernel version]"
 	echo "      -h|--help      print this usage message"
 	echo "      -v|--verbose   verbose progress messages"
 	echo "      -c|--lvmconf   path to lvm.conf (/etc/lvm/lvm.conf)"
 	echo "      -m|--modules   modules to copy to initrd image"
 	echo "      -e|--extra     extra files to add to initrd"
 	echo "      -r|--raid      raid devices to start in initrd"
 	echo "      -R|--raidconf  location of mdadm.conf file to include"
 	echo "      -M|--makedev   set MAKEDEV type (debian, redhat, gentoo)"
 }

 verbose () {
    [ "$VERBOSE" ] && echo "`echo $cmd | tr '[a-z0-9/_]' ' '` -- $1" || true
 }

 cleanup () {
   [ "`mount | grep $DEVRAM`" ] && verbose "unmounting $DEVRAM" && umount $DEVRAM
   [ -f $DEVRAM ] && verbose "removing $DEVRAM" && rm $DEVRAM
   [ -d $TMPMNT ] && verbose "removing $TMPMNT" && rmdir $TMPMNT
   verbose "exit with code $1"
   exit $1
 }

 trap "
   verbose 'Caught interrupt'
   echo 'Bye bye...'
   cleanup 1
 " 1 2 3 15

 create_init () {
    cat << 'INIT' > $TMPMNT/sbin/init
 #!/bin/bash

 # include in the path some dirs from the real root filesystem
 # for chroot, blockdev
 PATH="/sbin:/bin:/usr/sbin:/usr/bin:/lib/lvm-200:/initrd/bin:/initrd/sbin"
 PRE="initrd:"

 do_shell(){
     /bin/echo
     /bin/echo "*** Entering LVM2 rescue shell. Exit shell to continue booting. ***"
     /bin/echo
     /bin/bash
 }

 echo "$PRE Remounting / read/write"
 mount -t ext2 -o remount,rw /dev/ram0 /


 # We need /proc for device mapper
 echo "$PRE Mounting /proc"
 mount -t proc none /proc

 # plug in modules listed in /etc/modules
 if [ -f /etc/modules ]; then
     echo -n "$PRE plugging in kernel modules:"
     cat /etc/modules |
     while read module; do
         echo -n " $module"
         modprobe $module
     done
     echo '.'
 fi

 # start raid devices if raid_autostart file exists
 if [ -f /etc/raid_autostart ]; then
     if [ ! -f /etc/mdadm/mdadm.conf ]; then
         mdoptions='--super-minor=dev'
     fi
     cat /etc/raid_autostart|
     while read dev; do
     	echo "Starting RAID device $dev"
         /sbin/mdadm --assemble $dev $mdoptions
     done
 fi

 # Create the /dev/mapper/control device for the ioctl
 # interface using the major and minor numbers that have been allocated
 # dynamically.

 echo -n "$PRE Finding device mapper major and minor numbers "

 MAJOR=$(sed -n 's/^ *\([0-9]\+\) \+misc$/\1/p' /proc/devices)
 MINOR=$(sed -n 's/^ *\([0-9]\+\) \+device-mapper$/\1/p' /proc/misc)
 if test -n "$MAJOR" -a -n "$MINOR" ; then
 	mkdir -p -m 755 /dev/mapper
 	mknod -m 600 /dev/mapper/control c $MAJOR $MINOR
 fi

 echo "($MAJOR,$MINOR)"

 # Device-Mapper dynamically allocates all device numbers. This means it is possible
 # that the root volume specified to LILO or Grub may have a different number when the
 # initrd runs than when the system was last running. In order to make sure the
 # correct volume is mounted as root, the init script must determine what the
 # desired root volume name is by getting the LVM2 root volume name from the kernel command line. In order for
 # this to work correctly, "lvm2root=/dev/Volume_Group_Name/Root_Volume_Name" needs to be passed
 # to the kernel command line (where Root_Volume_Name is replaced by your actual
 # root volume's name.
 for arg in `cat /proc/cmdline`; do
 	echo $arg | grep '^lvm2root=' > /dev/null
 	if [ $? -eq 0 ]; then
 		rootvol=${arg#lvm2root=}
 		break
 	fi
 done

 echo "$PRE Activating LVM2 volumes"


 # run a shell if we're passed lvm2rescue on commandline
 grep lvm2rescue /proc/cmdline 1>/dev/null 2>&1
 if [ $? -eq 0 ]; then
     lvm vgchange --ignorelockingfailure -P -a y
     do_shell
 else
     lvm vgchange --ignorelockingfailure -a y
 fi

 echo "$PRE Mounting root filesystem $rootvol ro"
 mkdir /rootvol
 if ! mount -t auto -o ro $rootvol /rootvol; then
 	echo "\t*FAILED*";
 	do_shell
 fi

 echo "$PRE Umounting /proc"
 umount /proc

 echo "$PRE Changing roots"
 cd /rootvol
 if ! pivot_root . initrd ; then
 	echo "\t*FAILED*"
 	do_shell
 fi

 echo "$PRE Proceeding with boot..."

 exec chroot . /bin/sh -c "umount /initrd; blockdev --flushbufs /dev/ram0 ; exec /sbin/init $*" < dev/console > dev/console 2>&1

 INIT
    chmod 555 $TMPMNT/sbin/init
 }

 # create lvm.conf file from dumpconfig. Just use filter options
 create_lvmconf () {
     echo 'devices {' > $TMPMNT/etc/lvm/lvm.conf
     lvm dumpconfig | grep 'filter=' >> $TMPMNT/etc/lvm/lvm.conf
     echo '}' >> $TMPMNT/etc/lvm/lvm.conf
 }

 #
 # Main
 #

 cmd=`basename $0`

 VERSION=`uname -r`

 while [ $# -gt 0 ]; do
    case $1 in
    -h|--help) usage; exit 0;;
    -v|--verbose)  VERBOSE="y";;
    -c|--lvmconf)  LVMCONF=$2; shift;;
    -m|--modules)  MODULES=$2; shift;;
    -e|--extra)    EXTRAFILES=$2; shift;;
    -r|--raid)     RAID=$2; shift;;
    -R|--raidconf) RAIDCONF=$2; shift;;
    -M|--makedev)  MAKEDEV=$2; shift;;
    [2-9].[0-9]*.[0-9]*) VERSION=$1;;
    *) echo "$cmd -- invalid option '$1'"; usage; exit 0;;
    esac
    shift
 done

 INITRD=${INITRD:-"/boot/initrd-lvm2-$VERSION.gz"}

 echo "$cmd -- make LVM initial ram disk $INITRD"
 echo ""

 if [ -n "$RAID" ]; then
     BINFILES="$BINFILES /sbin/mdadm"
     RAIDCONF=${RAIDCONF:-"/etc/mdadm/mdadm.conf"}
     if [ -r $RAIDCONF ]; then
 	EXTRAFILES="$EXTRAFILES $RAIDCONF"
     else
         echo "$cmd -- WARNING: No $RAIDCONF! Your RAID device minor numbers must match their superblock values!"
     fi
 fi

 # add modprobe if we declared any modules
 if [ -n "$MODULES" ]; then
     BINFILES="$BINFILES /sbin/modprobe /sbin/insmod /sbin/rmmod"
 fi

 for a in $BINFILES $EXTRAFILES; do
     if [ ! -r "$a" ] ; then
 	echo "$cmd -- ERROR: you need $a"
 	exit 1;
     fi;
 done

 # Figure out which shared libraries we actually need in our initrd
 echo "$cmd -- finding required shared libraries"
 verbose "BINFILES: `echo $BINFILES`"

 # We need to strip certain lines from ldd output.  This is the full output of an example ldd:
 #lvmhost~ # ldd /sbin/lvm /bin/bash
 #/sbin/lvm:
 #        not a dynamic executable
 #/bin/bash:
 #        linux-gate.so.1 =>  (0xbfffe000)
 #        libncurses.so.5 => /lib/libncurses.so.5 (0xb7ee3000)
 #        libdl.so.2 => /lib/libdl.so.2 (0xb7edf000)
 #        libc.so.6 => /lib/libc.so.6 (0xb7dc1000)
 #        /lib/ld-linux.so.2 (0xb7f28000)
 #
 # 1) Lines with a ":" contain the name of the original binary we're examining, and so are unnecessary.
 #    We need to strip them because they contain "/", and can be confused with links with a hardcoded path.
 # 2) The linux-gate library is a virtual dll that does not exist on disk, but is instead loaded automatically
 #    into the process space, and can't be copied to the ramdisk
 #
 # After these lines have been stripped, we're interested in the lines remaining if they
 # 1) Contain "=>" because they are pathless links, and the value following the token is the path on the disk
 # 2) Contain "/" because it's a link with a hardcoded path, and so we're interested in the link itself.
 LIBFILES=`ldd $BINFILES 2>/dev/null |grep -v -E \(linux-gate\|:\) | awk '{if (/=>/) { print $3 } else if (/\//) { print $1 }}' | sort -u`
 if [ $? -ne 0 ]; then
    echo "$cmd -- ERROR figuring out needed shared libraries"
    exit 1
 fi

 verbose "Shared libraries needed: `echo $LIBFILES`"

 INITRDFILES="$BINFILES $LIBFILES $MODULES $EXTRAFILES"

 # tack on stuff for modules if we declared any and the files exist
 if [ -n "$MODULES" ]; then
     if [ -f "/etc/modprobe.conf" ]; then
 	INITRDFILES="$INITRDFILES /etc/modprobe.conf"
     fi
     if [ -f "/lib/modules/modprobe.conf" ]; then
 	INITRDFILES="$INITRDFILES /lib/modules/modprobe.conf"
     fi
 fi

 # Calculate the the size of the ramdisk image.
 # Don't forget that inodes take up space too, as does the filesystem metadata.
 echo "$cmd -- calculating initrd filesystem parameters"
 if [ -z "$INITRDSIZE" ]; then
    echo "$cmd -- calculating loopback file size"
    verbose "finding size"
    INITRDSIZE="`du -Lck $INITRDFILES | tail -1 | cut -f 1`"
    verbose "minimum: $INITRDSIZE kB for files + inodes + filesystem metadata"
    INITRDSIZE=`expr $INITRDSIZE + 512`  # enough for ext2 fs + a bit
 fi

 echo "$cmd -- making loopback file ($INITRDSIZE kB)"
 verbose "using $DEVRAM as a temporary loopback file"
 dd if=/dev/zero of=$DEVRAM count=$INITRDSIZE bs=1024 > /dev/null 2>&1
 if [ $? -ne 0 ]; then
    echo "$cmd -- ERROR creating loopback file"
    cleanup 1
 fi

 echo "$cmd -- making ram disk filesystem"
 verbose "mke2fs -F -m0 -L LVM-$VERSION $DEVRAM $INITRDSIZE"
 [ "$VERBOSE" ] && OPT_Q="" || OPT_Q="-q"
 mke2fs $OPT_Q -F -m0 -L LVM-$VERSION $DEVRAM $INITRDSIZE
 if [ $? -ne 0 ]; then
    echo "$cmd -- ERROR making ram disk filesystem"
    echo "$cmd -- ERROR you need to use mke2fs >= 1.14 or increase INITRDSIZE"
    cleanup 1
 fi

 verbose "creating mountpoint $TMPMNT"
 mkdir $TMPMNT
 if [ $? -ne 0 ]; then
    echo "$cmd -- ERROR making $TMPMNT"
    cleanup 1
 fi

 echo "$cmd -- mounting ram disk filesystem"
 verbose "mount -o loop $DEVRAM $TMPMNT"
 mount -oloop $DEVRAM $TMPMNT
 if [ $? -ne 0 ]; then
    echo "$cmd -- ERROR mounting $DEVRAM on $TMPMNT"
    cleanup 1
 fi

 verbose "creating basic set of directories in $TMPMNT"
 (cd $TMPMNT; mkdir bin dev etc lib proc sbin var)
 if [ $? -ne 0 ]; then
    echo "$cmd -- ERROR creating directories in $TMPMNT"
    cleanup 1
 fi

 # Add some /dev files. We have to handle different types of MAKEDEV invocations
 # here, so this is rather messy.
 RETCODE=0
 echo "$cmd -- adding required /dev files"
 verbose "BASICDEVICES: `echo $BASICDEVICES`"
 verbose "BLOCKDEVICES: `echo $BLOCKDEVICES`"
 [ "$VERBOSE" ] && OPT_Q="-v" || OPT_Q=""
 case "$MAKEDEV" in
 debian)
     (cd $TMPMNT/dev; /dev/MAKEDEV $OPT_Q $BASICDEVICES $BLOCKDEVICES)
     RETCODE=$?
     ;;
 redhat)
     (cd $TMPMNT/dev; /dev/MAKEDEV $OPT_Q -d $TMPMNT/dev -m 2)
     RETCODE=$?
     ;;
 gentoo)
     (cd $TMPMNT/dev; /sbin/MAKEDEV $OPT_Q $BASICDEVICES $BLOCKDEVICES)
     RETCODE=$?
     ;;
 *)
     echo "$cmd -- ERROR: $MAKEDEV is not a known MAKEDEV style."
     RETCODE=1
     ;;
 esac


 if [ $RETCODE -ne 0 ]; then
    echo "$cmd -- ERROR adding /dev files"
    cleanup 1
 fi


 # copy necessary files to ram disk
 echo "$cmd -- copying initrd files to ram disk"
 [ "$VERBOSE" ] && OPT_Q="-v" || OPT_Q="--quiet"
 verbose "find \$INITRDFILES | cpio -pdmL $OPT_Q $TMPMNT"
 find $INITRDFILES | cpio -pdmL $OPT_Q $TMPMNT
 if [ $? -ne 0 ]; then
    echo "$cmd -- ERROR cpio to ram disk"
    cleanup 1
 fi


 echo "$cmd -- creating symlinks to busybox"
 shopt -s extglob
 [ "$VERBOSE" ] && OPT_Q="-v" || OPT_Q=""
 BUSYBOXSYMLINKS=`busybox 2>&1| awk '/^Currently defined functions:$/ {i++;next} i'|tr ',\t\n' ' '`
 for link in ${BUSYBOXSYMLINKS//@(linuxrc|init|busybox)}; do
 	ln -s $OPT_Q busybox $TMPMNT/bin/$link;
 done
 shopt -u extglob

 echo "$cmd -- creating new $TMPMNT/sbin/init"
 create_init
 if [ $? -ne 0 ]; then
    echo "$cmd -- ERROR creating init"
    cleanup
    exit 1
 fi

 # copy LVMCONF into place or create a stripped down one from lvm dumpconfig
 mkdir -p $TMPMNT/etc/lvm
 if [ -n "$LVMCONF" ]; then
     echo "$cmd -- copying $LVMCONF to $TMPMNT/etc/lvm/lvm.conf"
     if [ -f "$LVMCONF" ]; then
         cp $LVMCONF $TMPMNT/etc/lvm/lvm.conf
     else
         echo "$cmd -- ERROR: $LVMCONF does not exist!"
 	cleanup
 	exit 1
     fi
 else
     echo "$cmd -- creating new $TMPMNT/etc/lvm/lvm.conf"
     create_lvmconf
 fi

 if [ -n "$RAID" ]; then
     RAIDLIST="$TMPMNT/etc/raid_autostart"
     echo "$cmd -- creating $RAIDLIST file."
     for device in $RAID; do
         echo $device >> $RAIDLIST
     done
 fi

 # create modules.dep and /etc/modules files if needed
 if [ -n "$MODULES" ]; then
     echo "$cmd -- creating $MODDIR/modules.dep file and $TMPMNT/etc/modules"
     depmod -b $TMPMNT $VERSION
     for module in $MODULES; do
         basename $module | sed 's/\.k\{0,1\}o$//' >> $TMPMNT/etc/modules
     done
 fi

 verbose "removing $TMPMNT/lost+found"
 rmdir $TMPMNT/lost+found

 echo "$cmd -- ummounting ram disk"
 umount $DEVRAM
 if [ $? -ne 0 ]; then
    echo "$cmd -- ERROR umounting $DEVRAM"
    cleanup 1
 fi

 echo "$cmd -- creating compressed initrd $INITRD"
 verbose "dd if=$DEVRAM bs=1k count=$INITRDSIZE | gzip -9"
 dd if=$DEVRAM bs=1k count=$INITRDSIZE 2>/dev/null | gzip -9 > $INITRD
 if [ $? -ne 0 ]; then
    echo "$cmd -- ERROR creating $INITRD"
    cleanup 1
 fi


 cat << FINALTXT
 --------------------------------------------------------
 Your initrd is ready in $INITRD

 Don't forget to set root=/dev/ram0 in kernel parameters
 Don't forget to set lvm2root=/dev/VG/LV in kernel parameters, where LV is your root volume
 If you use lilo try adding/modifying an entry similar to this one in lilo.conf:

 image=/boot/vmlinuz-lvm2-$VERSION
         label="ramdisk_LVM"
         initrd=/boot/initrd-lvm2-$VERSION.gz
         append="root=/dev/ram0 lvm2root=/dev/system/root <other parameters>"

 If using grub try adding/modifying an entry similar to this one in menu.lst

 title ramdisk LVM
         kernel /boot/vmlinuz-lvm2-$VERSION root=/dev/ram0 lvm2root=/dev/system/root <other parameters>
         initrd /boot/initrd-lvm2-$VERSION.gz

 You can also pass lvm2rescue to the kernel to get a shell
 --------------------------------------------------------
 FINALTXT

 cleanup 0
	#!/bin/bash
	#
	# lvm2create_initrd
	#
	# Miguel Cabeca
	# cabeca (at) ist (dot) utl (dot) pt
	#
	# Inspiration to write this script came from various sources
	#
	# Original LVM lvmcreate_initrd: ftp://ftp.sistina.com/pub/LVM/1.0/
	# Kernel initrd.txt: http://www.kernel.org/
	# EVMS INSTALL.initrd & linuxrc: http://evms.sourceforge.net/
	# Jeffrey Layton's lvm2create_initrd: http://poochiereds.net/svn/lvm2create_initrd/
	# Christophe Saout's initrd & linuxrc: http://www.saout.de/misc/
	#
	# This script was only tested with kernel 2.6 with everything required to boot
	# the root filesystem built-in (not as modules). Ex: SCSI or IDE, RAID, device mapper
	# It does not support devfs as it is deprecated in the 2.6 kernel series
	#
	# It needs lvm2 tools, busybox, pivot_root, MAKEDEV
	#
	# It has been tested on Debian sid (unstable) only
	#
	# Changelog
	# 26/02/2004 Initial release -- Miguel Cabeca
	# 27/02/2004 Removed the BUSYBOXSYMLINKS var. The links are now determined at runtime.
	# some changes in init script to call a shell if something goes wrong. -- Miguel Cabeca
	# 19/04/2004 Several small changes. Pass args to init so single user mode works. Add some
	# PATH entries to /sbin/init shell script so chroot works without /usr mounted. Remove
	# mkdir /initrd so we don't cause problems if root filesystem is corrupted. -- Jeff Layton
	# 15/05/2004 initial support for modules, create lvm.conf from lvm dumpconfig, other cleanups -- Jeff Layton
	# 14/11/2006 Update handling of ldd output to handle hardcoded library links and virtual dll linux-gate.
	# Add support for Gentoo-style MAKEDEV. Remove hardcoded BINUTILS paths -- Douglas Mayle
	#
	# Copyright Miguel Cabeca, Jeffrey Layton, 2004
	#
	# 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; either version 2 of the License, or
	# (at your option) any later version.
	#
	# This program is distributed in the hope that it will be useful,
	# but WITHOUT ANY WARRANTY; without even the implied warranty of
	# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	# GNU General Public License for more details.
	#
	# You should have received a copy of the GNU General Public License
	# along with this program; if not, write to the Free Software
	# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
	#
	# $Id$

	TMPMNT=/tmp/mnt.$$
	DEVRAM=/tmp/initrd.$$

	# set defaults
	BINFILES=${BINFILES:-"`which lvm` `which bash` `which busybox` `which pivot_root`"}
	BASICDEVICES=${BASICDEVICES:-"std consoleonly fd"}
	BLOCKDEVICES=${BLOCKDEVICES:-"md hda hdb hdc hdd sda sdb sdc sdd"}
	MAKEDEV=${MAKEDEV:-"debian"}

	# Uncomment this if you want to disable automatic size detection
	#INITRDSIZE=4096

	PATH=/bin:/sbin:/usr/bin:/usr/sbin:$PATH

	usage () {
	echo "Create an initial ramdisk image for LVM2 root filesystem"
	echo "$cmd: [-h] [-v] [-c lvm.conf] [-m modulelist] [-e extrafiles] -r [raiddevs] [-R mdadm.conf] [-M style] [kernel version]"
	echo " -h\|--help print this usage message"
	echo " -v\|--verbose verbose progress messages"
	echo " -c\|--lvmconf path to lvm.conf (/etc/lvm/lvm.conf)"
	echo " -m\|--modules modules to copy to initrd image"
	echo " -e\|--extra extra files to add to initrd"
	echo " -r\|--raid raid devices to start in initrd"
	echo " -R\|--raidconf location of mdadm.conf file to include"
	echo " -M\|--makedev set MAKEDEV type (debian, redhat, gentoo)"
	}

	verbose () {
	[ "$VERBOSE" ] && echo "`echo $cmd \| tr '[a-z0-9/_]' ' '` -- $1" \|\| true
	}

	cleanup () {
	[ "`mount \| grep $DEVRAM`" ] && verbose "unmounting $DEVRAM" && umount $DEVRAM
	[ -f $DEVRAM ] && verbose "removing $DEVRAM" && rm $DEVRAM
	[ -d $TMPMNT ] && verbose "removing $TMPMNT" && rmdir $TMPMNT
	verbose "exit with code $1"
	exit $1
	}

	trap "
	verbose 'Caught interrupt'
	echo 'Bye bye...'
	cleanup 1
	" 1 2 3 15

	create_init () {
	cat << 'INIT' > $TMPMNT/sbin/init
	#!/bin/bash

	# include in the path some dirs from the real root filesystem
	# for chroot, blockdev
	PATH="/sbin:/bin:/usr/sbin:/usr/bin:/lib/lvm-200:/initrd/bin:/initrd/sbin"
	PRE="initrd:"

	do_shell(){
	/bin/echo
	/bin/echo "* Entering LVM2 rescue shell. Exit shell to continue booting. *"
	/bin/echo
	/bin/bash
	}

	echo "$PRE Remounting / read/write"
	mount -t ext2 -o remount,rw /dev/ram0 /


	# We need /proc for device mapper
	echo "$PRE Mounting /proc"
	mount -t proc none /proc

	# plug in modules listed in /etc/modules
	if [ -f /etc/modules ]; then
	echo -n "$PRE plugging in kernel modules:"
	cat /etc/modules \|
	while read module; do
	echo -n " $module"
	modprobe $module
	done
	echo '.'
	fi

	# start raid devices if raid_autostart file exists
	if [ -f /etc/raid_autostart ]; then
	if [ ! -f /etc/mdadm/mdadm.conf ]; then
	mdoptions='--super-minor=dev'
	fi
	cat /etc/raid_autostart\|
	while read dev; do
	echo "Starting RAID device $dev"
	/sbin/mdadm --assemble $dev $mdoptions
	done
	fi

	# Create the /dev/mapper/control device for the ioctl
	# interface using the major and minor numbers that have been allocated
	# dynamically.

	echo -n "$PRE Finding device mapper major and minor numbers "

	MAJOR=$(sed -n 's/^ *\([0-9]\+\) \+misc$/\1/p' /proc/devices)
	MINOR=$(sed -n 's/^ *\([0-9]\+\) \+device-mapper$/\1/p' /proc/misc)
	if test -n "$MAJOR" -a -n "$MINOR" ; then
	mkdir -p -m 755 /dev/mapper
	mknod -m 600 /dev/mapper/control c $MAJOR $MINOR
	fi

	echo "($MAJOR,$MINOR)"

	# Device-Mapper dynamically allocates all device numbers. This means it is possible
	# that the root volume specified to LILO or Grub may have a different number when the
	# initrd runs than when the system was last running. In order to make sure the
	# correct volume is mounted as root, the init script must determine what the
	# desired root volume name is by getting the LVM2 root volume name from the kernel command line. In order for
	# this to work correctly, "lvm2root=/dev/Volume_Group_Name/Root_Volume_Name" needs to be passed
	# to the kernel command line (where Root_Volume_Name is replaced by your actual
	# root volume's name.
	for arg in `cat /proc/cmdline`; do
	echo $arg \| grep '^lvm2root=' > /dev/null
	if [ $? -eq 0 ]; then
	rootvol=${arg#lvm2root=}
	break
	fi
	done

	echo "$PRE Activating LVM2 volumes"


	# run a shell if we're passed lvm2rescue on commandline
	grep lvm2rescue /proc/cmdline 1>/dev/null 2>&1
	if [ $? -eq 0 ]; then
	lvm vgchange --ignorelockingfailure -P -a y
	do_shell
	else
	lvm vgchange --ignorelockingfailure -a y
	fi

	echo "$PRE Mounting root filesystem $rootvol ro"
	mkdir /rootvol
	if ! mount -t auto -o ro $rootvol /rootvol; then
	echo "\tFAILED";
	do_shell
	fi

	echo "$PRE Umounting /proc"
	umount /proc

	echo "$PRE Changing roots"
	cd /rootvol
	if ! pivot_root . initrd ; then
	echo "\tFAILED"
	do_shell
	fi

	echo "$PRE Proceeding with boot..."

	exec chroot . /bin/sh -c "umount /initrd; blockdev --flushbufs /dev/ram0 ; exec /sbin/init $*" < dev/console > dev/console 2>&1

	INIT
	chmod 555 $TMPMNT/sbin/init
	}

	# create lvm.conf file from dumpconfig. Just use filter options
	create_lvmconf () {
	echo 'devices {' > $TMPMNT/etc/lvm/lvm.conf
	lvm dumpconfig \| grep 'filter=' >> $TMPMNT/etc/lvm/lvm.conf
	echo '}' >> $TMPMNT/etc/lvm/lvm.conf
	}

	#
	# Main
	#

	cmd=`basename $0`

	VERSION=`uname -r`

	while [ $# -gt 0 ]; do
	case $1 in
	-h\|--help) usage; exit 0;;
	-v\|--verbose) VERBOSE="y";;
	-c\|--lvmconf) LVMCONF=$2; shift;;
	-m\|--modules) MODULES=$2; shift;;
	-e\|--extra) EXTRAFILES=$2; shift;;
	-r\|--raid) RAID=$2; shift;;
	-R\|--raidconf) RAIDCONF=$2; shift;;
	-M\|--makedev) MAKEDEV=$2; shift;;
	[2-9].[0-9].[0-9]) VERSION=$1;;
	*) echo "$cmd -- invalid option '$1'"; usage; exit 0;;
	esac
	shift
	done

	INITRD=${INITRD:-"/boot/initrd-lvm2-$VERSION.gz"}

	echo "$cmd -- make LVM initial ram disk $INITRD"
	echo ""

	if [ -n "$RAID" ]; then
	BINFILES="$BINFILES /sbin/mdadm"
	RAIDCONF=${RAIDCONF:-"/etc/mdadm/mdadm.conf"}
	if [ -r $RAIDCONF ]; then
	EXTRAFILES="$EXTRAFILES $RAIDCONF"
	else
	echo "$cmd -- WARNING: No $RAIDCONF! Your RAID device minor numbers must match their superblock values!"
	fi
	fi

	# add modprobe if we declared any modules
	if [ -n "$MODULES" ]; then
	BINFILES="$BINFILES /sbin/modprobe /sbin/insmod /sbin/rmmod"
	fi

	for a in $BINFILES $EXTRAFILES; do
	if [ ! -r "$a" ] ; then
	echo "$cmd -- ERROR: you need $a"
	exit 1;
	fi;
	done

	# Figure out which shared libraries we actually need in our initrd
	echo "$cmd -- finding required shared libraries"
	verbose "BINFILES: `echo $BINFILES`"

	# We need to strip certain lines from ldd output. This is the full output of an example ldd:
	#lvmhost~ # ldd /sbin/lvm /bin/bash
	#/sbin/lvm:
	# not a dynamic executable
	#/bin/bash:
	# linux-gate.so.1 => (0xbfffe000)
	# libncurses.so.5 => /lib/libncurses.so.5 (0xb7ee3000)
	# libdl.so.2 => /lib/libdl.so.2 (0xb7edf000)
	# libc.so.6 => /lib/libc.so.6 (0xb7dc1000)
	# /lib/ld-linux.so.2 (0xb7f28000)
	#
	# 1) Lines with a ":" contain the name of the original binary we're examining, and so are unnecessary.
	# We need to strip them because they contain "/", and can be confused with links with a hardcoded path.
	# 2) The linux-gate library is a virtual dll that does not exist on disk, but is instead loaded automatically
	# into the process space, and can't be copied to the ramdisk
	#
	# After these lines have been stripped, we're interested in the lines remaining if they
	# 1) Contain "=>" because they are pathless links, and the value following the token is the path on the disk
	# 2) Contain "/" because it's a link with a hardcoded path, and so we're interested in the link itself.
	LIBFILES=`ldd $BINFILES 2>/dev/null \|grep -v -E \(linux-gate\\|:\) \| awk '{if (/=>/) { print $3 } else if (/\//) { print $1 }}' \| sort -u`
	if [ $? -ne 0 ]; then
	echo "$cmd -- ERROR figuring out needed shared libraries"
	exit 1
	fi

	verbose "Shared libraries needed: `echo $LIBFILES`"

	INITRDFILES="$BINFILES $LIBFILES $MODULES $EXTRAFILES"

	# tack on stuff for modules if we declared any and the files exist
	if [ -n "$MODULES" ]; then
	if [ -f "/etc/modprobe.conf" ]; then
	INITRDFILES="$INITRDFILES /etc/modprobe.conf"
	fi
	if [ -f "/lib/modules/modprobe.conf" ]; then
	INITRDFILES="$INITRDFILES /lib/modules/modprobe.conf"
	fi
	fi

	# Calculate the the size of the ramdisk image.
	# Don't forget that inodes take up space too, as does the filesystem metadata.
	echo "$cmd -- calculating initrd filesystem parameters"
	if [ -z "$INITRDSIZE" ]; then
	echo "$cmd -- calculating loopback file size"
	verbose "finding size"
	INITRDSIZE="`du -Lck $INITRDFILES \| tail -1 \| cut -f 1`"
	verbose "minimum: $INITRDSIZE kB for files + inodes + filesystem metadata"
	INITRDSIZE=`expr $INITRDSIZE + 512` # enough for ext2 fs + a bit
	fi

	echo "$cmd -- making loopback file ($INITRDSIZE kB)"
	verbose "using $DEVRAM as a temporary loopback file"
	dd if=/dev/zero of=$DEVRAM count=$INITRDSIZE bs=1024 > /dev/null 2>&1
	if [ $? -ne 0 ]; then
	echo "$cmd -- ERROR creating loopback file"
	cleanup 1
	fi

	echo "$cmd -- making ram disk filesystem"
	verbose "mke2fs -F -m0 -L LVM-$VERSION $DEVRAM $INITRDSIZE"
	[ "$VERBOSE" ] && OPT_Q="" \|\| OPT_Q="-q"
	mke2fs $OPT_Q -F -m0 -L LVM-$VERSION $DEVRAM $INITRDSIZE
	if [ $? -ne 0 ]; then
	echo "$cmd -- ERROR making ram disk filesystem"
	echo "$cmd -- ERROR you need to use mke2fs >= 1.14 or increase INITRDSIZE"
	cleanup 1
	fi

	verbose "creating mountpoint $TMPMNT"
	mkdir $TMPMNT
	if [ $? -ne 0 ]; then
	echo "$cmd -- ERROR making $TMPMNT"
	cleanup 1
	fi

	echo "$cmd -- mounting ram disk filesystem"
	verbose "mount -o loop $DEVRAM $TMPMNT"
	mount -oloop $DEVRAM $TMPMNT
	if [ $? -ne 0 ]; then
	echo "$cmd -- ERROR mounting $DEVRAM on $TMPMNT"
	cleanup 1
	fi

	verbose "creating basic set of directories in $TMPMNT"
	(cd $TMPMNT; mkdir bin dev etc lib proc sbin var)
	if [ $? -ne 0 ]; then
	echo "$cmd -- ERROR creating directories in $TMPMNT"
	cleanup 1
	fi

	# Add some /dev files. We have to handle different types of MAKEDEV invocations
	# here, so this is rather messy.
	RETCODE=0
	echo "$cmd -- adding required /dev files"
	verbose "BASICDEVICES: `echo $BASICDEVICES`"
	verbose "BLOCKDEVICES: `echo $BLOCKDEVICES`"
	[ "$VERBOSE" ] && OPT_Q="-v" \|\| OPT_Q=""
	case "$MAKEDEV" in
	debian)
	(cd $TMPMNT/dev; /dev/MAKEDEV $OPT_Q $BASICDEVICES $BLOCKDEVICES)
	RETCODE=$?
	;;
	redhat)
	(cd $TMPMNT/dev; /dev/MAKEDEV $OPT_Q -d $TMPMNT/dev -m 2)
	RETCODE=$?
	;;
	gentoo)
	(cd $TMPMNT/dev; /sbin/MAKEDEV $OPT_Q $BASICDEVICES $BLOCKDEVICES)
	RETCODE=$?
	;;
	*)
	echo "$cmd -- ERROR: $MAKEDEV is not a known MAKEDEV style."
	RETCODE=1
	;;
	esac


	if [ $RETCODE -ne 0 ]; then
	echo "$cmd -- ERROR adding /dev files"
	cleanup 1
	fi


	# copy necessary files to ram disk
	echo "$cmd -- copying initrd files to ram disk"
	[ "$VERBOSE" ] && OPT_Q="-v" \|\| OPT_Q="--quiet"
	verbose "find \$INITRDFILES \| cpio -pdmL $OPT_Q $TMPMNT"
	find $INITRDFILES \| cpio -pdmL $OPT_Q $TMPMNT
	if [ $? -ne 0 ]; then
	echo "$cmd -- ERROR cpio to ram disk"
	cleanup 1
	fi


	echo "$cmd -- creating symlinks to busybox"
	shopt -s extglob
	[ "$VERBOSE" ] && OPT_Q="-v" \|\| OPT_Q=""
	BUSYBOXSYMLINKS=`busybox 2>&1\| awk '/^Currently defined functions:$/ {i++;next} i'\|tr ',\t\n' ' '`
	for link in ${BUSYBOXSYMLINKS//@(linuxrc\|init\|busybox)}; do
	ln -s $OPT_Q busybox $TMPMNT/bin/$link;
	done
	shopt -u extglob

	echo "$cmd -- creating new $TMPMNT/sbin/init"
	create_init
	if [ $? -ne 0 ]; then
	echo "$cmd -- ERROR creating init"
	cleanup
	exit 1
	fi

	# copy LVMCONF into place or create a stripped down one from lvm dumpconfig
	mkdir -p $TMPMNT/etc/lvm
	if [ -n "$LVMCONF" ]; then
	echo "$cmd -- copying $LVMCONF to $TMPMNT/etc/lvm/lvm.conf"
	if [ -f "$LVMCONF" ]; then
	cp $LVMCONF $TMPMNT/etc/lvm/lvm.conf
	else
	echo "$cmd -- ERROR: $LVMCONF does not exist!"
	cleanup
	exit 1
	fi
	else
	echo "$cmd -- creating new $TMPMNT/etc/lvm/lvm.conf"
	create_lvmconf
	fi

	if [ -n "$RAID" ]; then
	RAIDLIST="$TMPMNT/etc/raid_autostart"
	echo "$cmd -- creating $RAIDLIST file."
	for device in $RAID; do
	echo $device >> $RAIDLIST
	done
	fi

	# create modules.dep and /etc/modules files if needed
	if [ -n "$MODULES" ]; then
	echo "$cmd -- creating $MODDIR/modules.dep file and $TMPMNT/etc/modules"
	depmod -b $TMPMNT $VERSION
	for module in $MODULES; do
	basename $module \| sed 's/\.k\{0,1\}o$//' >> $TMPMNT/etc/modules
	done
	fi

	verbose "removing $TMPMNT/lost+found"
	rmdir $TMPMNT/lost+found

	echo "$cmd -- ummounting ram disk"
	umount $DEVRAM
	if [ $? -ne 0 ]; then
	echo "$cmd -- ERROR umounting $DEVRAM"
	cleanup 1
	fi

	echo "$cmd -- creating compressed initrd $INITRD"
	verbose "dd if=$DEVRAM bs=1k count=$INITRDSIZE \| gzip -9"
	dd if=$DEVRAM bs=1k count=$INITRDSIZE 2>/dev/null \| gzip -9 > $INITRD
	if [ $? -ne 0 ]; then
	echo "$cmd -- ERROR creating $INITRD"
	cleanup 1
	fi


	cat << FINALTXT
	--------------------------------------------------------
	Your initrd is ready in $INITRD

	Don't forget to set root=/dev/ram0 in kernel parameters
	Don't forget to set lvm2root=/dev/VG/LV in kernel parameters, where LV is your root volume
	If you use lilo try adding/modifying an entry similar to this one in lilo.conf:

	image=/boot/vmlinuz-lvm2-$VERSION
	label="ramdisk_LVM"
	initrd=/boot/initrd-lvm2-$VERSION.gz
	append="root=/dev/ram0 lvm2root=/dev/system/root <other parameters>"

	If using grub try adding/modifying an entry similar to this one in menu.lst

	title ramdisk LVM
	kernel /boot/vmlinuz-lvm2-$VERSION root=/dev/ram0 lvm2root=/dev/system/root <other parameters>
	initrd /boot/initrd-lvm2-$VERSION.gz

	You can also pass lvm2rescue to the kernel to get a shell
	--------------------------------------------------------
	FINALTXT

	cleanup 0