#!/bin/sh


#------------------------- ANALYZE-MY-LVM ----------------------- Hugo Rabson
# 07/14
# - no longer blank first 4k of /dev/mdX
#
# 06/14/2004
# - fixed "n >= 2.00" bug (shell doesn't handle floating points properly)
# - handle dm_mod as well as dm-mod
#
# 02/18/2004
# - nice patch to fix ListAllVolumeGroups() --- J. Richard
# - patch to support LVM2 by Takeru Komoriya
#
# 10/15/2003
# - fixed '-L'-handling to allow for floating-point gigabyte values
#
# 01/15/2003
# - patch (LVM) by Brian Borgeson
#
# 12/10/2002
# - patch by Benjamin Mampaey
#
# 09/05/2002
# - additional patch by Ralph Gruwe
#
# 08/30/2002
# - modified by Ralph Gruwe
#
# 10/01/2001
# - last modified by Hugo :)
#------------------------------------------------------------------------------

Die() {
    echo "$1" >> /dev/stderr
    exit 1
}



GetValueFromField() {
    local res
    cat "$1" | sed s/'    '/~/ | tr -s ' ' ' ' | sed s/'~ '/'~'/ | grep -i "$2~" | cut -d'~' -f2,3,4,5 | tr '~' ' ' | gawk '{ if ($2=="MB") {printf "%sm",$1;} else if ($2=="KB") {printf "%sk",$1;} else if ($2=="GB") {printf "%sg",$1;} else {print $0;};}'
}


GetLastBit() {
    local i res
    i=20
    res=""
    while [ ! "$res" ] ; do
	i=$(($i-1))
	res=`echo "$1" | cut -d'/' -f$i`
    done
    echo "$res"
}


ProcessLogicalVolume() {
    local LV_full_string fname logical_volume volume_group device
    LV_full_string=$1
    [ ! -e "$1" ] && Die "Cannot find LV file $1"
    volume_group=`echo "$LV_full_string" | cut -d'/' -f3`
    logical_volume=`echo "$LV_full_string" | cut -d'/' -f4`
    if [ $lvmversion = 2 ]; then
	device=$LV_full_string
	params=`GenerateLvcreateParameters $device`
	echo "# lvm lvcreate$params -n $logical_volume $volume_group"
    else
	fname=/proc/lvm/VGs/$volume_group/LVs/$logical_volume
	if [ ! -e "$fname" ] ; then
	    echo "Warning - cannot find $volume_group's $logical_volume LV file"
	else
	    device=`GetValueFromField $fname "name:"`
	    params=`GenerateLvcreateParameters $device`
	    echo "# lvcreate$params -n $logical_volume $volume_group"
	fi
    fi
}


GenerateLvcreateParameters() {
    local device stripes stripesize device fname allocation output readahead
    fname=/tmp/PLF.$$.txt
    device=$1
    output=""
    if [ $lvmversion = 2 ]; then
	lvm lvdisplay $device > $fname
    else
	lvdisplay $device > $fname
    fi
    stripes=`GetValueFromField $fname "Stripes"`
    stripesize=`GetValueFromField $fname "Stripe size (MByte)"`m
    [ "$stripesize" = "m" ] && stripesize=`GetValueFromField $fname "Stripe size (KByte)"`k
    [ "$stripesize" = "k" ] && stripesize=""
    allocation=`GetValueFromField $fname "LV Size"`
    [ ! "`echo "$allocation" | grep "[k,m,g]"`" ] && allocation="$allocation"m
    if echo "$allocation" | grep -x ".*g" > /dev/null 2> /dev/null ; then
	val=`echo "$allocation" | sed s/g//`
	allocation=`echo "$val" | awk '{c=$1; printf "%d", c*1024;}'`m
    fi
    readahead=`GetValueFromField $fname "Read ahead sectors"`
    rm -f $fname
    [ "$stripes" ]    && output="$output -i $stripes"
    [ "$stripesize" ] && output="$output -I $stripesize"
    [ "$allocation" ] && output="$output -L $allocation"
    [ "$readahead" ]  && output="$output -r $readahead"
    echo "$output"
}



GenerateVgcreateParameters() {
    local current_VG device fname incoming VG_info_file max_logical_volumes max_physical_volumes physical_extent_size output blanklines
    current_VG=$1
    VG_info_file=/tmp/$$.vg-info.txt
    if [ $lvmversion = 2 ]; then
	lvm vgdisplay $current_VG > $VG_info_file
    else
	vgdisplay $current_VG > $VG_info_file
    fi
    max_logical_volumes=`GetValueFromField "$VG_info_file" "MAX LV"`
    [ $max_logical_volumes -ge 256 ] && max_logical_volumes=255
    max_physical_volumes=`GetValueFromField "$VG_info_file" "MAX PV"`
    [ $max_physical_volumes -ge 256 ] && max_physical_volumes=255
    physical_extent_size=`GetValueFromField "$VG_info_file" "PE Size"`
    output=""
    [ "$max_logical_volumes" ]  && output="$output -l $max_logical_volumes"
    [ "$max_physical_volumes" ] && output="$output -p $max_physical_volumes"
    [ "$physical_extent_size" ] && output="$output -s $physical_extent_size"
    echo "$output"
    rm -f $VG_info_file
}





ProcessVolumeGroup() {
    local current_VG physical_volumes i list_of_devices VG_params
    current_VG=$1
    if [ $lvmversion = 2 ]; then
	VG_params=`GenerateVgcreateParameters $current_VG`
	list_of_devices=`lvm pvs | grep "$current_VG" | awk '{print $1}'`
	echo "# lvm vgcreate $current_VG$VG_params $list_of_devices"
	echo "# lvm vgchange -a y $current_VG"
    else
	info_file=/proc/lvm/VGs/$current_VG/group
	physical_volumes=`ls /proc/lvm/VGs/$current_VG/PVs`
	VG_params=`GenerateVgcreateParameters $current_VG`
	list_of_devices=""
	for i in $physical_volumes ; do
	    fname=/proc/lvm/VGs/$current_VG/PVs/$i
	    device=`GetValueFromField $fname "name:"`
	    list_of_devices="$list_of_devices $device"
	done
	echo "# vgcreate $current_VG$VG_params$list_of_devices"
	echo "# vgchange -a y $current_VG"
    fi
}



ListAllPhysicalVolumes() {
    if [ $lvmversion = 2 ]; then
	lvm pvscan 2> /dev/null | grep 'PV' | awk '{print $2}'
    else
	pvscan 2> /dev/null | grep '"' | cut -d'"' -f2
    fi
}


ListAllVolumeGroups() {
    if [ $lvmversion = 2 ]; then
        lvm vgdisplay 2> /dev/null | awk '/^ *VG Name/ {print $3;}'
    else
        vgdisplay 2> /dev/null | awk '/^VG Name/ {print $3;}'
    fi
}


ListLvmDrivesAndPartitions() {
    if [ $lvmversion = 2 ]; then
	lvm vgdisplay -v |grep "PV Name" | awk '{print $3}'
    else
	vgdisplay -v |grep "PV Name" | awk '{print $4}'
    fi
}



PrettifyList() {
    local i
    echo -en "$1"
    for i in $2 ; do
	echo -en "$i "
    done
    echo ""
}


ListAllLogicalVolumes() {
    if [ $lvmversion = 2 ]; then
	lvm lvscan | grep "'" | cut -d"'" -f2
    else
	lvscan | grep '"' | cut -d'"' -f2
    fi
}



WriteShutdownScript() {
    local i
    echo ""
    echo "Finally, to shut down and delete the volumes, do this:-"
    if [ $lvmversion = 2 ]; then
	for i in `ListAllLogicalVolumes` ; do
	    echo "(lvm lvremove -f $i)"
	done
	for i in `ListAllVolumeGroups` ; do
	    echo "(lvm vgchange -a n $i)"
	done
	for i in `ListAllVolumeGroups` ; do
	    echo "(lvm vgremove $i)"
	done
	echo "(rmmod dm-mod & rmmod dm_mod & )"
    else
	for i in `ListAllLogicalVolumes` ; do
	    echo "(lvremove -f $i)"
	done
	for i in `ListAllVolumeGroups` ; do
	    echo "(vgchange -a n $i)"
	done
	for i in `ListAllVolumeGroups` ; do
	    echo "(vgremove $i)"
	done
	echo "(rmmod lvm-mod)"
    fi
}



# -------------------------------- main -----------------------------------
which lvmdiskscan 2>/dev/null 2>&1 || Die "Cannot find lvmdiskscan. Are you sure you're using LVM?"
if [ -e "/proc/lvm/global" ] && [ "`cat /proc/lvm/global | tr -s '\t' ' ' | grep "0 VGs 0 PVs 0 LVs"`" != "" ] ; then
    exit 0
fi

# Sq-Mod ... V1 has different output. --version is not legal but version
# gets displayed so I guess it's ok... This should work for both.

#lvmversion=`lvmdiskscan --version | grep "LVM version:" | cut -d: -f2 | cut -d. -f1 | sed -e 's/ //g'`

lvmversion=`lvmdiskscan --help |
  grep -E "Logical Volume Manager|LVM version:" |
  cut -d: -f2 | cut -d. -f1 |
  awk '{print $NF}' |
  sed -e 's/ //g'`

if which lvm 2>/dev/null; then
    version=`lvm version | grep "LVM version" | awk '{print $3}'`
    i="`echo "$version" | cut -d'.' -f1`"
    echo "i=$i"
    if [ "$i" -ge "2" ] ; then
#    if [ $version >= "2.00" ]; then
	lvmversion=2
    fi
fi

if [ $lvmversion = 2 ]; then
    echo "LVM version >= 2.0 found."
fi

all_lvm_drives_and_partitions=`ListLvmDrivesAndPartitions`
echo "Just before you extrapolate mountlist to include RAID partitions,"
echo "extrapolate it to include the following LVM drives and partitions:-"
PrettifyList ">>>>> " "$all_lvm_drives_and_partitions"
echo "To get started, type:-"
if [ $lvmversion = 2 ]; then
    echo "(insmod dm-mod)"
    echo "(insmod dm_mod)"
    echo "# lvm vgchange -an"
else
    echo "(insmod lvm-mod)"
    echo "# vgchange -an"
fi
for i in `ListAllPhysicalVolumes` ; do
#    echo "# dd if=/dev/zero of=$i bs=512 count=1"
    if [ $lvmversion = 2 ]; then
	echo "# echo y | lvm pvcreate -ff $i"
    else
	echo "# echo y | pvcreate -ff $i"
    fi
done
if [ $lvmversion = 2 ]; then
    echo "# lvm vgscan; echo"
else
    echo "# vgscan; echo"
fi
echo ""
echo "Create and activate the VG's (volume groups)."
all_volume_groups=`ListAllVolumeGroups`
for current_VG in $all_volume_groups ; do
    if [ $lvmversion -ne 2 ]; then
        echo "# rm -Rf /dev/$current_VG"
    fi
    ProcessVolumeGroup $current_VG
done
echo ""
echo "Finally, create the LV's (logical volumes)."
all_logical_volumes=`ListAllLogicalVolumes`
for current_LV in $all_logical_volumes ; do
    ProcessLogicalVolume $current_LV
done
echo ""
if [ $lvmversion = 2 ]; then
    echo "# lvm vgscan"
else
    echo "# vgscan"
fi
echo "Now you may format the LV's:-"
for i in `ListAllLogicalVolumes` ; do
    echo "(mkfs -t foo $i or something like that)"
done
WriteShutdownScript
exit 0