Few Sample of pre installation script using kickstart configuration for Custom partition by checking list of disk

Sample-kickstart configuration-partition.cfg

# vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv
# START pre-kvmhost-partitions
#

set \$(list-harddrives)
echo "\$@"
disk=( \$1 \$3 )
size=( \$2 \$4 )

echo "S1: \${size[0]} S2: \${size[1]}"
echo "D1: \${disk[0]} D2: \${disk[1]}"

# Make PV assignments based on size
if [[ \${size[0]} < \${size[1]} ]] ; then
    root_d=\${disk[0]}
    data_d=\${disk[1]}
else
    root_d=\${disk[1]}
    data_d=\${disk[0]}
fi

echo "ROOT: \$root_d"
echo "DATA: \$data_d"

cat << EOF > /tmp/partinfo
part /boot --fstype ext3 --size 200 --ondisk=\$root_d --asprimary
part swap --recommended --ondisk=\$root_d --asprimary
part pv.root --size=1024 --grow --ondisk=\$root_d
part pv.data --size=1024 --grow --ondisk=\$data_d
volgroup vg00 pv.root
volgroup vg01 pv.data
logvol / --fstype ext3 --size=1024 --vgname=vg00 --name=root --grow
logvol /srv --fstype ext3 --size=1024 --vgname=vg01 --name=data --grow
EOF

#
# END pre-kvmhost-partitions
# ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^



%pre  
#!/bin/sh  
hds="" 
mymedia=""  
for file in /proc/ide/h* do   
	mymedia=`cat $file/media`   
	if [ $mymedia == "disk" ] ; then       
		hds="$hds `basename $file`"   
	fi 
done  
set $hds 
numhd=`echo $#`  
drive1=`echo $hds | cut -d' ' -f1` 
drive2=`echo $hds | cut -d' ' -f2`  
#Write out partition scheme based on whether there are 1 or 2 hard drives  
if [ $numhd == "2" ] ; then   
	#2 drives   
	echo "#partitioning scheme generated in %pre for 2 drives" > /tmp/part-include   
	echo "clearpart --all" >> /tmp/part-include   
	echo "part /boot --fstype ext3 --size 75 --ondisk hda" >> /tmp/part-include   
	echo "part / --fstype ext3 --size 1 --grow --ondisk hda" >> /tmp/part-include   
	echo "part swap --recommended --ondisk $drive1" >> /tmp/part-include   
	echo "part /home --fstype ext3 --size 1 --grow --ondisk hdb" >> /tmp/part-include 
else   
	#1 drive   
	echo "#partitioning scheme generated in %pre for 1 drive" > /tmp/part-include   
	echo "clearpart --all" >> /tmp/part-include   
	echo "part /boot --fstype ext3 --size 75" >> /tmp/part-include   
	echo "part swap --recommended" >> /tmp/part-include   
	echo "part / --fstype ext3 --size 2048" >> /tmp/part-include   
	echo "part /home --fstype ext3 --size 2048 --grow" >> /tmp/part-include 
fi














#-----------------------------------------------cut-----------------------------------------
# main part of kickstart

# include the partitioning logic from the pre section.
%include /tmp/part-include

%pre
# pre section
#----- partitioning logic below--------------
# pick the first drive that is not removable and is over MINSIZE
DIR="/sys/block"

# minimum size of hard drive needed specified in GIGABYTES
MINSIZE=60

ROOTDRIVE=""

# /sys/block/*/size is in 512 byte chunks

for DEV in sda sdb sdc sdd hda hdb; do
  if [ -d $DIR/$DEV ]; then
    REMOVABLE=`cat $DIR/$DEV/removable`
    if (( $REMOVABLE == 0 )); then
      echo $DEV
      SIZE=`cat $DIR/$DEV/size`
      GB=$(($SIZE/2**21))
      if [ $GB -gt $MINSIZE ]; then
        echo "$(($SIZE/2**21))"
        if [ -z $ROOTDRIVE ]; then
          ROOTDRIVE=$DEV
        fi
      fi
    fi
  fi
done

echo "ROOTDRIVE=$ROOTDRIVE"

# drives smaller than 240GB use fixed-size partions
# drives larger than 240GB use percentage-based partition sizes

if [ $GB -lt 240 ]; then

# drives smaller than 240GB
cat << EOF > /tmp/part-include
zerombr
clearpart --all --drives=$ROOTDRIVE --initlabel
#clearpart --all --drives=$ROOTDRIVE
bootloader --location=mbr --driveorder=$ROOTDRIVE
part /boot --fstype ext3 --size=300 --ondisk=$ROOTDRIVE
part pv.8 --size=100 --grow --ondisk=$ROOTDRIVE
volgroup VolGroup00 --pesize=65536 pv.8
logvol / --fstype ext3 --name=root --vgname=VolGroup00 --size=30000
logvol swap --fstype swap --name=swap --vgname=VolGroup00 --size=8000
logvol /tmp --fstype ext3 --name=tmp --vgname=VolGroup00 --size=10000
logvol /var/log --fstype ext3 --name=varlog --vgname=VolGroup00 --size=1000
logvol /usr/vice/cache --fstype ext3 --name=usrvicecache --vgname=VolGroup00 --size=17000
EOF

else
# drives 240GB and larger

cat << EOF > /tmp/part-include
zerombr
clearpart --all --drives=$ROOTDRIVE --initlabel
#clearpart --all --drives=$ROOTDRIVE
bootloader --location=mbr --driveorder=$ROOTDRIVE
part /boot --fstype ext3 --size=300 --ondisk=$ROOTDRIVE
part pv.8 --size=100 --grow --ondisk=$ROOTDRIVE
volgroup VolGroup00 --pesize=65536 pv.8
logvol / --fstype ext3 --name=root --vgname=VolGroup00 --percent=12
logvol swap --fstype swap --name=swap --vgname=VolGroup00 --percent=4
logvol /tmp --fstype ext3 --name=tmp --vgname=VolGroup00 --percent=4
logvol /var/log --fstype ext3 --name=varlog --vgname=VolGroup00 --percent=1
logvol /usr/vice/cache --fstype ext3 --name=usrvicecache --vgname=VolGroup00 --percent=7
EOF

fi
#-----------------------------------------------cut-----------------------------------------





#
 # Kickstart config file.  Produces the actual kickstart file to be given
 # to anaconda.  Documentation for each option is listed in the comments 
 # above where the option is produced.  
 #
 # This file documents as many of the kickstart keywords and options as
 # possible.  The models do not support all the options, but more are
 # added as needed.
 #
 # Some document names are abbreviated:
 #
 # SAG: RHEL4 System Administration Guide, English edition 
 # (rhel-sag-en.pdf)
 #
 #platform=x86, AMD64, or Intel EM64T
 # Required
 #
 
 
 # Kickstart Specific Settings
 #
 # lang
 # SAG p9
 # lang is the language used during install.
 # langsupport is the set of languages to be supported on the installed system.
 # keyboard is the keyboard connected to the system.
 lang en_US 
 
 # Perform kickstart in text mode.  There's no need for a graphical build,
 # even off a CD/DVD.
 # text: SAG pg16
 text
 
 
 # Install or upgrade?
 # install: SAG p8
 # upgrade: SAG p16
 install
 
 # Use NFS installation media
 nfs --server=buildserver.mydomain.com --dir=/export/centos/5.5/os/x86_64
 
 # Network settings
 network --device eth0 --bootproto static --ip 192.168.1.3 --netmask 255.255.255.0 --gateway 192.168.1.254 --nameserver 192.168.11.253
 
 # What to do after installation
 # poweroff: SAG pg 13
 # halt: SAG pg 8
 # reboot: SAG pg 14
 poweroff
 
 #
 # System Specific Settings
 # 
 
 # langsupport and keyboard
 langsupport --default=en_US en_GB 
 keyboard us
 
 # System Devices
 
 # Bootloader
 # SAG pg 5
 bootloader --append="" --location=mbr
 
 # Network information
 # SAG pp10-12
 #
 
 # SELinux configuration
 # Need to add SELinux Policy support through policy modules.
 #
 selinux --disabled
 
 # System authorization information
 # SAG pp 2-5
 auth --enablemd5 --enableshadow
 
 
 # Autoconfigure mouse
 # SAG p10
 # "mouse" with no options autodetects the mouse
 # Optionally, it can have three arguments.
 #       [--device=ttyS0] [--emulthree] [mousetype]
 #
 mouse
 
 # Firewall configuration
 # SAG p 7
 firewall --disabled
 
 # Run the Setup Agent on first boot
 # Mode is one of enabled, disabled, reconfig
 # SAG pp 7-8
 firstboot --disable
 
 #
 # Root password 
 #
 # SAG pg 15
 rootpw --iscrypted XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
 
 # System timezone (set via %pre?)
 # timezone: SAG pg16
 timezone --utc Australia/Melbourne
 
 # X or no X
 # Either "skipx" or "xconfig --startxonboot"
 # skipx: SAG p15
 
 skipx
 
 
 #clearpart --initlabel
 # Disk partitioning information
 
 #
 # Partition information
 # zerombr: SAG p17
 zerombr yes
 
 # NOTE - Partition information is generated in the pre scripts
 %include "/tmp/partitions.ks"
 
 #
 # OS Specific Tags
 # Use this section for tags specific to a particular config
 #
 #entitlement
 key bbe5b781bb89f5b6
 
 # Packages
 # SAG pp 18-19
 # --nobase is documented in various mailing lists.  For example,
 # http://www.sage.org/lists/sage-members-archive/2006/msg01378.html.
 #
 %packages --nobase --resolvedeps
 aide
 at
 bc
 .
 . Lots of packages truncated!
 .
 yum
 yum-utils
 zip
 
 #
 # Pre-install scripts
 # SAG pp 19-21
 
 # Partition information generator
 %pre --interpreter=/usr/bin/python
 import re
 import os
 
 partitions = [['/', 4096, 0, 0],['/boot', 100, 0, 1],['swap', 8192, 0, 0],['/var', 1, 1, 0],['/usr', 8192, 0, 0],['/home', 8192, 0, 0]]
 m_ide = re.compile(r'(hd[a-z]):\s+([0-9]+)\s+sectors\s+\(([0-9]+)\sMB\)')
 m_scsi = re.compile(r'SCSI\s+device\s+(sd[a-z]):\s+([0-9]+)\s+.*\(([0-9]+)\s+MB\)')
 
 i = dict()
 s = dict()
 pipe = os.popen('dmesg', 'r')
 for line in pipe.readlines():
   m = m_ide.search(line)
   if m:
     i[m.group(1)] = [m.group(2), m.group(3)]
   m = m_scsi.search(line)
   if m:
     s[m.group(1)] = [m.group(2), m.group(3)]
 
 ide_drives = list()
 scsi_drives = list()
 do_drives = list()
 for k in i.keys(): ide_drives.append([k, i[k][0], i[k][1]])
 for k in s.keys(): scsi_drives.append([k, s[k][0], s[k][1]])
 
 if (len(ide_drives) > 0):
   if ((len(ide_drives) == 2) and ((ide_drives[0][1] == ide_drives[1][1]) and (ide_drives[0][2] == ide_drives[1][2]))): do_drives = ide_drives
   else: do_drives = 'hda'
 elif (len(scsi_drives) > 0):
   if ((len(scsi_drives) == 2) and ((scsi_drives[0][1] == scsi_drives[1][1]) and (scsi_drives[0][2] == scsi_drives[1][2]))): do_drives = scsi_drives
   else: do_drives = 'sda'
 else: do_drives = 'sda'
 
 pfile = open("/tmp/partitions.ks", "w")
 pfile.write("clearpart --all --initlabel --drives=%s\n" % ",".join([x[0] for x in do_drives]))
 rstr = 
 
 for index, p in enumerate(partitions):
   if (len(do_drives) == 2):
     pfile.write("partition raid.0%d --size=%d %s %s --ondisk=%s\n" % (index, p[1], ((p[2] == 1) and '--grow' or ), ((p[3] == 1) and '--asprimary' or ), do_drives[0][0]))
     pfile.write("partition raid.1%d --size=%d %s %s --ondisk=%s\n" % (index, p[1], ((p[2] == 1) and '--grow' or ), ((p[3] == 1) and '--asprimary' or ), do_drives[1][0]))
     rstr += "raid %s --fstype=%s --device=md%d --level 1 raid.0%d raid.1%d\n" % (p[0], ((p[0] == 'swap') and 'swap' or 'ext3'), index, index, index)
   else:
     pfile.write("partition %s --fstype=%s --size=%d %s %s --ondisk=%s\n" % (p[0], ((p[0] == 'swap') and 'swap' or 'ext3'), p[1], ((p[2] == 1) and '--grow' or ), ((p[3] == 1) and '--asprimary' or ), do_drives[0][0]))
 
 pfile.write(rstr)
 pfile.close()
 
 pfile = open("/tmp/partition-script.ks", "w")
 if (len(do_drives) == 2):
   pfile.write("\n%post\n/sbin/grub << EOF\n")
   for d in do_drives:
     pfile.write("device (hd0) /dev/%s\nroot (hd0,0)\nsetup (hd0)\n" % d[0])
   pfile.write("quit\n")
   pfile.write("EOF\n")
 pfile.close()
 
 #
 # OS Specific Pre Scripts
 #
 
 
 # NOTE - Grub setup, if needed
 %include "/tmp/partition-script.ks"