#!/bin/bash
#
# $Id: modified-iso-install-raid,v 1.2 2004/06/19 11:49:32 suter Exp $
# Copyright (C) 2003 Mark Suter <mark.suter@miju.com.au>
#
# 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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

## Which build to install
build=ebbe

## Our "die" function (think perl)
function die () { echo "$@" 1>&2 ; exit 1 ; }

## Set our PATH and test for needed binaries
export PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
hash test date cat sfdisk modprobe mkraid mkfs mkswap mkdir mount umount bzip2 cpio chmod sync chroot || die $0: required binaries not present

## Record our starting time
start=$(date +%s)

## Are you sure?
test "$( id -u )" == "0" || die $0: Please run this script as root
cat <<EOF 1>&2
#################################################################

This script will repartition /dev/hda and /dev/hdc to install a
base system using GNU/Linux's disk mirroring (raid1).  You will
lose all existing data on both drives.

Enter "Wipe the Two Disks" at the prompt below to proceed.
EOF
while [ "${resp}" != "Wipe the Two Disks" ] ; do
    read -p "? " resp
done
cat <<EOF 1>&2

Proceeding with installation...

#################################################################
EOF

## Exit on any error, display the commands
set -x -e

## Umount any auto-detected filesystems
/etc/init.d/mount.local stop

## Wipe the partitions, then load the module: this avoids any existing md devices
echo -e "0,,L\n" | sfdisk /dev/hda
echo -e "0,,L\n" | sfdisk /dev/hdc
modprobe raid1

## Partition the disk
echo -e "0,5120,fd\n,2048,S\n,10240,fd\n,,fd\n;" | sfdisk -uM /dev/hda || die $0: You should copy this script and edit the sfdisk input
echo -e "0,5120,fd\n,2048,S\n,10240,fd\n,,fd\n;" | sfdisk -uM /dev/hdc || die $0: You should copy this script and edit the sfdisk input

## Prepare a raidtab describing the multiple disk (md) devices
## The chunksize is needed but not used and mkraid complains about it (Yes, I've checked)
cat <<EOF > /tmp/raidtab
raiddev			/dev/md0
raid-level		1
nr-raid-disks		2
nr-spare-disks		0
persistent-superblock	1
chunk-size		8
device			/dev/hda1
raid-disk		0
device			/dev/hdc1
raid-disk		1

raiddev			/dev/md1
raid-level		1
nr-raid-disks		2
nr-spare-disks		0
persistent-superblock	1
chunk-size		8
device			/dev/hda3
raid-disk		0
device			/dev/hdc3
raid-disk		1

raiddev			/dev/md2
raid-level		1
nr-raid-disks		2
nr-spare-disks		0
persistent-superblock	1
chunk-size		8
device			/dev/hda4
raid-disk		0
device			/dev/hdc4
raid-disk		1
EOF

## Create them (please don't mention the --really-force option, see "mkraid -f" for why.
mkraid --really-force --configfile /tmp/raidtab /dev/md0
mkraid --really-force --configfile /tmp/raidtab /dev/md1
mkraid --really-force --configfile /tmp/raidtab /dev/md2

## Make the filesystems
mkfs -t ext3 -L root -O filetype /dev/md0
mkswap /dev/hda2
mkswap /dev/hdc2
mkfs -t ext3 -L var  -O filetype /dev/md1
mkfs -t ext3 -L home -O filetype /dev/md2

## Mount the new system
mkdir /mnt/rw/$build
mount /dev/md0 /mnt/rw/$build
mkdir /mnt/rw/$build/var
mkdir /mnt/rw/$build/home
mount /dev/md1 /mnt/rw/$build/var
mount /dev/md2 /mnt/rw/$build/home

## Copy the files over (or from an existing server using ssh?)
# ( cd /mnt/rw/$build ; ssh XXX cd / \; find . -print0 \| cpio --null --format=crc --create | cpio --make-directories --preserve-modification-time --extract )
( cd /mnt/rw/$build ; bzip2 --stdout --decompress /mnt/media/$build | cpio --make-directories --preserve-modification-time --extract )

## Fix the /etc/fstab to refer to the multiple disk devices
cat <<EOF > /mnt/rw/$build/etc/fstab
# /etc/fstab: static file system information.
#
# <device>   <mount point>         <type>   <options>          <dump>  <pass>
/dev/md0     /                     ext3     errors=remount-ro  0       1
/dev/hda2    none                  swap     sw                 0       0
/dev/hdc2    none                  swap     sw                 0       0
/dev/md1     /var                  ext3     defaults           0       2
/dev/md2     /home                 ext3     defaults           0       2
/dev/ram     /tmp                  tmpfs    defaults           0       0
proc         /proc                 proc     defaults           0       0
/dev/fd0     /media/floppy         auto     user,noauto        0       0
/dev/cdrom   /media/cdrom          iso9660  ro,user,noauto     0       0
#
# Working directory for MIMEDefang
/dev/ram /var/spool/MIMEDefang tmpfs defaults,uid=defang,mode=0700 0 0
EOF

## Copy the raidtab file
cp /tmp/raidtab /mnt/rw/$build/etc/raidtab

## Make the system bootable
sync ; sync ; sync
chroot /mnt/rw/$build /sbin/grub --batch --device-map=/dev/null <<EOF || exit 1
device (fd0) /dev/fd0
device (hd0) /dev/hda
device (hd1) /dev/hdc
root (hd0,0)
setup (hd0)
root (hd1,0)
setup (hd1)
quit
EOF

## Umount and then remount
umount /mnt/rw/$build/home
umount /mnt/rw/$build/var
umount /mnt/rw/$build
mount -o ro /dev/md0 /mnt/rw/$build
mount -o ro /dev/md1 /mnt/rw/$build/var
mount -o ro /dev/md2 /mnt/rw/$build/home

## Let our admin know what's happened
elapsed=$(( $(date +%s) - $start ))
cat <<EOF 1>&2

#################################################################

Done in ${elapsed}s with the newly prepared system now under
/mnt/rw/$build for you to examine, then reboot and remove the cd.

#################################################################

EOF