Complex filesystem shell script

lvm.sh

#!/bin/sh

case "$1" in

# update the file 'partman-base.postinst' with our filesystem "installer"
installer)
#sed -i 's/partman/\/tmp\/lvm.sh partman/' /var/lib/dpkg/info/partman-base.postinst
sed -i 's/partman/\/tmp\/lvm.sh destroy; \/tmp\/lvm.sh partman/' /var/lib/dpkg/info/partman-base.postinst
logger -t lvm.sh modified partman-base.postinst
;;

# carry out the update we performed above
partman)
logger -t lvm.sh partition configuration starting

modprobe dm_mod
DISK_COUNT=`ls -1 /dev/sd? | wc -l`
# Fallback to normal partman setup if we don't detect our disks
if [ $DISK_COUNT -lt 2 ]
then
logger -t lvm.sh Cannot correct number of disks, running partman
partman
exit
fi

SIZE_SDA=`sed -n 's/.* \([0-9]*\) sda$/\1/p' < /proc/partitions`
SIZE_SDB=`sed -n 's/.* \([0-9]*\) sdb$/\1/p' < /proc/partitions`

logger -t lvm.sh found disks sda: $SIZE_SDA sdb: $SIZE_SDB

# main disk (sda)
logger -t lvm.sh partitioning sda
parted -s /dev/sda -- mklabel msdos
parted -s /dev/sda -- mkpart primary 256k 512  # /boot
parted -s /dev/sda -- mkpart primary 512 100%  # System LVM  
parted -s /dev/sda -- set 1 boot on
parted -s /dev/sda -- set 2 root on
parted -s /dev/sda -- set 2 lvm on
logger -t lvm.sh partioning sda complete

# secondary disk (sdb)
logger -t lvm.sh partitioning sdb
parted -s /dev/sdb -- mklabel msdos
parted -s /dev/sdb -- mkpart primary 0 100%
parted -s /dev/sdb -- set 1 lvm on
logger -t lvm.sh partitioning sdb complete

# provision the filesystem for main disk
mke2fs -q -L boot /dev/sda1
logger -t lvm.sh "created boot file systems"
pvcreate -ff -y /dev/sda2
logger -t lvm.sh "created LVM physical volume on sda2"
vgcreate vg_system /dev/sda2
logger -t lvm.sh "created LVM volume group (vg_system) on sda2"
lvcreate -l 100%FREE -n root vg_system
logger -t lvm.sh "created logical volume (root) on vg_system"
mkfs.ext4 -q -L root /dev/vg_system/root
logger -t lvm.sh "created filesystem on root (vg_system)"
  
# provision the secondary disk (sdb)
pvcreate -ff -y /dev/sdb1
logger -t lvm.sh "created LVM physical volume on sdb1"
vgcreate vg_core /dev/sdb1
logger -t lvm.sh "created LVM volume group (vg_core) on sdb1"
lvcreate -L 4G -n tmp vg_core
logger -t lvm.sh "created logical volume (tmp) on vg_core"
lvcreate -L 8G -n home vg_core
logger -t lvm.sh "created logical volume (home) on vg_core"
lvcreate -L 4G -n var vg_core
logger -t lvm.sh "created logical volume (var) on vg_core"
lvcreate -L 10G -n logaudit vg_core
logger -t lvm.sh "created logical volume (logaudit) on vg_core"
lvcreate -L 30G -n varlog vg_core
logger -t lvm.sh "created logical volume (varlog) on vg_core"
mkfs.ext4 -q -L tmp /dev/vg_core/tmp
logger -t lvm.sh "created filesystem on tmp (vg_core)"
mkfs.ext4 -q -L home /dev/vg_core/home
logger -t lvm.sh "created filesystem on home (vg_core)"
mkfs.ext4 -q -L var /dev/vg_core/var
logger -t lvm.sh "created filesystem on var (vg_core)"
mkfs.ext4 -q -L logaudit /dev/vg_core/logaudit
logger -t lvm.sh "created filesystem on logaudit (vg_core)"
mkfs.ext4 -q -L varlog /dev/vg_core/varlog
logger -t lvm.sh "created filesystem on varlog (vg_core)"

# Create directory structure
logger -t lvm.sh creating base file structure
mkdir /target
mount /dev/vg_system/root /target
mkdir /target/home
mount /dev/vg_core/home /target/home
mkdir /target/var
mount /dev/vg_core/var /target/var
mkdir /target/var/log
mount /dev/vg_core/varlog /target/var/log
mkdir /target/var/log/audit
mount /dev/vg_core/logaudit /target/var/log/audit 
mkdir /target/tmp
mount /dev/vg_core/tmp /target/tmp
mkdir /target/boot
mount /dev/sda1 /target/boot

# Create fstab
logger -t lvm.sh creating fstab
mkdir /target/etc 
echo "# /etc/fstab: static file system information." > /target/etc/fstab
echo "#" >> /target/etc/fstab  
echo "# <file system>   <mount point>   <type>   <options>       <dump> <pass>" >> /target/etc/fstab
echo "LABEL=root     /       ext4 defaults,noatime                     0  0" >> /target/etc/fstab 
echo "LABEL=home     /home   ext4 defaults,nodev                       0  2" >> /target/etc/fstab 
echo "LABEL=var      /var    ext4 defaults,noatime                    0  2" >> /target/etc/fstab 
echo "LABEL=varlog   /var/log  ext4 defaults                    0  2" >> /target/etc/fstab
echo "LABEL=logaudit /var/log/audit  ext4 defaults,noatime                    0  2" >> /target/etc/fstab
echo "LABEL=tmp      /tmp    ext4 defaults,nodev,noexec,nosuid  0  2" >> /target/etc/fstab  
echo "LABEL=boot     /boot   ext2 defaults,nodev,noexec       0  2" >> /target/etc/fstab 
echo "proc           /proc   proc defaults                    0  0" >> /target/etc/fstab
   
;;
 
destroy)
logger -t lvm.sh Destroying existing volumes
umount /target/var/log/audit
umount /target/var/log
umount /target/var
umount /target/home
umount /target/tmp
umount /target/boot
umount /target
# swapoff /dev/vg0/swap
pvremove -ff -y /dev/sda2
pvremove -ff -y /dev/sdb1

;;
 
*)
 echo $0: This script is destructive and should only be run as part of the debian-installer process
;;

esac