d8zroot.sh

###############################################################################
#
# Debian Jessie (version 8) installation script for ZFS root filesystem
#
# Copyright : Francois Scala @2016
# License   : GPL v3
#
#
# Disk schema :
# +-- DISK -------------------------------------------------------------------+
# | +-Part 4---+ +-Part 1--+ +-Part 2----+ +-Part 3-------------------------+ |
# | | BIOS EFI | | Ext4    | | Swap      | | ZFS root                       | |
# | |          | | /boot   | |           | |                                | |
# | +----------+ +---------+ +-----------+ +--------------------------------+ |
# +---------------------------------------------------------------------------+
#
###############################################################################

# Debian
DEBIANDIST=jessie
#DEBIANMIRROR="http://ftp.us.debian.org/debian"
DEBIANMIRROR="http://ftp.ch.debian.org/debian"

# ZFS
POOL=rpool
ZFSRELEASE=zfsonlinux_6_all.deb

# Default grub options
BOOT_OPTIONS="quiet vga=794"

###############################################################################
# customize your root password, user account here and other parameters
function do_user {

# Set root password
echo 'root:root' | chpasswd

# Create a user
adduser --gecos "Some User" --shell /bin/bash --disabled-password user
echo 'user:user' | chpasswd
#mkdir /home/user/.ssh
#cat > /home/user/.ssh/authorized_keys << _EOF
#ssh-rsa AAAAB3NzaC1yc2EAAAABJQA.....
#_EOF
#chown -R user.user /home/user/.ssh

# Locales
apt-get install -y locales
locale-gen en_US.UTF-8
locale-gen C.UTF-8
export LANG=C.UTF-8

# Misc
DEBIAN_FRONTEND=noninteractive apt-get install -y tree htop ssh strace mc vim

# Automation (puppet, cfengine, ...)

}

###############################################################################
# customize your partition scheme here
function do_partitions {

DISK=/dev/sda
PARTBOOT=${DISK}1
PARTSWAP=${DISK}2
PARTZROOT=${DISK}3
BOOTPARAM=${DISK}

apt-get update
apt-get install -y gdisk

sgdisk --clear  ${DISK}
sgdisk -n 1::+512M  -c 1:"BOOT"  -t 1:8300 ${DISK}
sgdisk -n 2::+2G    -c 2:"SWAP"  -t 2:8200 ${DISK}
sgdisk -n 3::       -c 3:"ZROOT" -t 3:bf00 ${DISK}
sgdisk -n 4:34:2047 -c 4:"BIOS"  -t 4:ef02 ${DISK}

# DEBUG : to reinstall on existing system
#dd if=/dev/zero of=${DISK}1 bs=1M count=1
#dd if=/dev/zero of=${DISK}2 bs=1M count=1
#dd if=/dev/zero of=${DISK}3 bs=1M count=1

# /boot
mkfs.ext4 -L BOOT ${PARTBOOT}

# Swap
mkswap -f -L SWAP ${PARTSWAP}
#swapon -va

}

###############################################################################
# customize your rpool setup
function do_rpool {

zpool create -o ashift=12 -o altroot=/mnt -m none              ${POOL} ${PARTZROOT}
zfs set atime=off                                              ${POOL}

zfs create -o mountpoint=none                                  ${POOL}/ROOT
zfs create -o mountpoint=/                                     ${POOL}/ROOT/debian-1

zpool set bootfs=${POOL}/ROOT/debian-1                         ${POOL}

zfs create -o mountpoint=/home                                 ${POOL}/home
#zfs create -o mountpoint=/usr                                  ${POOL}/usr # separated /usr unsupported by systemd
zfs create -o mountpoint=/var                                  ${POOL}/var
zfs create -o compression=lz4 -o atime=on                      ${POOL}/var/mail
zfs create -o compression=lz4 -o setuid=off -o exec=off        ${POOL}/var/log
zfs create -o compression=lz4 -o setuid=off -o exec=off        ${POOL}/var/tmp
zfs create -o mountpoint=/tmp -o compression=lz4 -o setuid=off ${POOL}/tmp

}

###############################################################################
###############################################################################
###############################################################################
###############################################################################
###############################################################################
# Nothing should be change after this line

echo "==========================================================="
echo "==="
echo "=== Partitioning"
echo "==="
do_partitions

###############################################################################
echo "==========================================================="
echo "==="
echo "=== Install ZFS On Linux on Live image"
echo "==="
if [ ! -f ${ZFSRELEASE} ]
then
	wget http://archive.zfsonlinux.org/debian/pool/main/z/zfsonlinux/${ZFSRELEASE}
fi
dpkg -i ${ZFSRELEASE}
apt-get update
apt-get install -y linux-image-amd64 debian-zfs
modprobe zfs

###############################################################################
echo "==========================================================="
echo "==="
echo "=== Create ZFS Pool ${POOL}"
echo "==="
do_rpool

zpool export ${POOL}
zpool import -d /dev/disk/by-id -R /mnt ${POOL}

mkdir -p /mnt/etc/zfs/
zpool set cachefile=/mnt/etc/zfs/zpool.cache ${POOL}

mkdir -p /mnt/boot
mount /dev/disk/by-partlabel/BOOT /mnt/boot

###############################################################################
echo "==========================================================="
echo "==="
echo "=== Bootstrap Debian ${DEBIANDIST}"
echo "==="

apt-get install -y debootstrap
debootstrap ${DEBIANDIST} /mnt ${DEBIANMIRROR}

cp /etc/hostname /mnt/etc/
cp /etc/hosts /mnt/etc/
cp ${ZFSRELEASE} /mnt/tmp/

echo "Generate fstab"
cat > /mnt/etc/fstab << _EOF
LABEL=BOOT	/boot	ext4	noatime	0	1
LABEL=SWAP	none	swap	defaults	0	0
_EOF

echo "Generate network/interfaces"
cat > /mnt/etc/network/interfaces << _EOF
# interfaces(5) file used by ifup(8) and ifdown(8)
auto lo
iface lo inet loopback

auto eth0
iface eth0 inet dhcp
_EOF

# Generate chroot script
declare -f do_user > /mnt/tmp/chroot.sh
cat >> /mnt/tmp/chroot.sh << _EOF

cd /tmp/

do_user

echo "==========================================================="
echo "==="
echo "=== Install ZFS On Linux on target system"
echo "==="

apt-get install -y lsb-release
dpkg -i /tmp/${ZFSRELEASE}
apt-get update
apt-get install -y linux-image-amd64 debian-zfs

DEBIAN_FRONTEND=noninteractive apt-get install -y grub2-common grub-pc zfs-initramfs
grub-install --target=i386-pc --force ${BOOTPARAM}
mkdir -vp /boot/grub/
grub-mkconfig -o /boot/grub/grub.cfg

unset UCF_FORCE_CONFFOLD
export UCF_FORCE_CONFFNEW=YES
ucf --purge /boot/grub/menu.lst

apt-get update
DEBIAN_FRONTEND=noninteractive apt-get -o Dpkg::Options::="--force-confnew" --force-yes -fuy dist-upgrade

###############################################################################
# patch grub
echo "Set grub default config"
cp /etc/default/grub /etc/default/grub.orig
echo "default/grub : GRUB_CMDLINE_LINUX_DEFAULT"
sed -i "s-GRUB_CMDLINE_LINUX_DEFAULT=\"quiet-GRUB_CMDLINE_LINUX_DEFAULT=\"${BOOT_OPTIONS}-" /etc/default/grub
update-grub

_EOF

###############################################################################
echo "==========================================================="
echo "==="
echo "=== Chroot installation step"
echo "==="

mount --bind /dev  /mnt/dev
mount --bind /proc /mnt/proc
mount --bind /sys  /mnt/sys

chroot /mnt bash /tmp/chroot.sh 2>&1 | tee /mnt/root/install-chroot.log

# XXX Uncomment this to inspect/hack the system before the final unmount and reboot
#echo "XXXXXXXXXXXXXXXXXXXXXXX Confirm to unmount"
#read bla

umount /mnt/boot
umount /mnt/dev
umount /mnt/proc
umount /mnt/sys
zfs umount -a
zpool export ${POOL}

echo "==========================================================="
echo "==========================================================="
echo "==========================================================="
echo "==="
echo "==="
echo "==="
echo "==="
echo "==="
echo "==="
echo "==="
echo "==="
echo "==="
echo "==="
echo "==="
echo "===     Installation completed."
echo "==="
echo "===     You can now remove the boot device and reboot to"
echo "===     your new installation"
echo "==="

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