#!/bin/bash
#
# System installer.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as
# published by the Free Software Foundation, either version 3 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 Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public
# License along with this program.  If not, see
# <http://www.gnu.org/licenses/>.

# Load.
source $APP_BASE/lib/hydra/functions || exit 1
hydra_config_load

# Create a logical volume
function hydra_lvcreate {
  local volume="$1"
  local size="$2"

  if [ -z "$volume" ] || [ "$size" == "0" ]; then
    return
  fi

  if ! lvdisplay $vg/$volume &> /dev/null; then
    echo "Creating logical volume $volume..."
    hydra_safe_run lvcreate -L$size -n $volume $vg
  fi
}

# Create a physical volume
function hydra_create_volume {
  local volume="$1"

  if [ -z "$volume" ] || [ ! -b "/dev/$vg/$volume" ]; then
    return
  fi

  if [ "$encrypt" == "y" ]; then
    echo "Creating encrypted $volume device..."
    hydra_safe_run cryptsetup -h sha256 -c aes-cbc-essiv:sha256 -s 256 luksFormat /dev/$vg/$volume
    hydra_safe_run cryptsetup luksOpen /dev/$vg/$volume $volume
    hydra_safe_run mkfs.ext4 /dev/mapper/debootstrap

    if [ "$volume" == "root" ]; then
      install_device="/dev/mapper/$volume"
    fi
  else
    echo "Creating $volume device..."
    mkfs.ext4 /dev/vg/$volume

    if [ "$volume" == "root" ]; then
      install_device="/dev/vg/$volume"
    fi
  fi
}

# Setup.
hydra_user_input device /dev/sdb "Destination device"
hydra_user_input root_size 20G "Size of root partition"
hydra_user_input swap y "Use swap? (y/n)"
hydra_user_input home_size 0 "Size of home partition (0 to not create it)"
hydra_user_input var_size 0 "Size of var partition (0 to not create it)"
hydra_user_input encrypt y "Encrypt volumes? (y/n)"
hydra_user_input garbage y "Pre-fill volumes with garbage? (y/n)"
hydra_user_input hostname $HOSTNAME "Hostname"
hydra_user_input domain example.com "Domain"
hydra_user_input arch amd64 "System arch"
hydra_user_input version squeeze "Distro version"
hydra_user_input vg vg "Temporary install vg"
hydra_user_input grub n "Setup GRUB? (y/n)"
hydra_user_input mirror http://cdn.debian.net/debian/ "Debian mirror"

# Check for requirements.
for req in debootstrap cryptsetup grub-pc lvm2 parted; do
  hydra_install_package $req
done

# Warning.
cat <<-EOF
WARNING: about to partition $device!
Press ENTER to continue, Ctrl-C to abort."
EOF
read answer

# Disk partitioning.
if [ "$swap" == "y" ]; then
  hydra_safe_run parted -s -- $device mklabel msdos
  hydra_safe_run parted -s -- $device unit MB mkpart primary linux-swap 2     2000
  hydra_safe_run parted -s -- $device unit MB mkpart primary ext2       2000  2200
  hydra_safe_run parted -s -- $device unit MB mkpart primary ext2       2200 -1
  hydra_safe_run parted -s -- $device set 2 boot on
  hydra_safe_run parted -s -- $device set 3 lvm  on

  # Change devices to absolute path names.
  swap_device="$device"1
  boot_device="$device"2
  syst_device="$device"3
else
  hydra_safe_run parted -s -- $device mklabel msdos
  hydra_safe_run parted -s -- $device unit MB mkpart primary ext2 2    200
  hydra_safe_run parted -s -- $device unit MB mkpart primary ext2 200 -1
  hydra_safe_run parted -s -- $device set 1 boot on
  hydra_safe_run parted -s -- $device set 2 lvm  on

  # Change devices to absolute path names.
  boot_device="$device"1
  syst_device="$device"2
fi

# Create volumes.
echo "Creating the needed disk volumes..."

if ! pvdisplay $syst_device &> /dev/null; then
  echo "Creating physical volume..."
  hydra_safe_run pvcreate $syst_device
fi

if ! vgdisplay $vg &> /dev/null; then
  echo "Creating volume group..."
  hydra_safe_run vgcreate $vg $syst_device
fi

hydra_lvcreate root $root_size
hydra_lvcreate home $home_size
hydra_lvcreate var  $var_size

hydra_safe_run vgchange -a y $vg

# Garbage.
if [ "$garbage" == "y" ]; then
  echo "Filling volumes with garbage..."

  dd if=/dev/urandom of=/dev/$vg/root

  if [ -b "/dev/$vg/home" ]; then
    dd if=/dev/urandom of=/dev/$vg/home
  fi

  if [ -b "/dev/$vg/var" ]; then
    dd if=/dev/urandom of=/dev/$vg/var
  fi

  if [ "$swap" == "y" ]; then
    dd if=/dev/urandom of=$swap_device
  fi
fi

# Setup mountpoint and make sure it's not mounted due to a failed install.
mkdir -p /tmp/debootstrap
umount /tmp/debootstrap/proc &> /dev/null
umount /tmp/debootstrap/dev  &> /dev/null

# Create devices
hydra_create_volume root
hydra_create_volume home
hydra_create_volume var

# Initial system install.
echo "Installing base system..."
hydra_safe_run mount $install_device /tmp/debootstrap/
hydra_safe_run debootstrap --arch=$arch $version /tmp/debootstrap/ $mirror

# Initial configuration.
echo "Applying initial configuration..."
mount none -t proc /tmp/debootstrap/proc
mount none -t sysfs /tmp/debootstrap/sys
mount -o bind /dev/ /tmp/debootstrap/dev
echo LANG=C > /tmp/debootstrap/etc/default/locale

# Resolver configuration.
echo "domain $domain" > /tmp/debootstrap/etc/resolv.conf
echo "search $hostname.$domain" >> /tmp/debootstrap/etc/resolv.conf
grep nameserver /etc/resolv.conf >> /tmp/debootstrap/etc/resolv.conf

# Hostname configuration.
echo $hostname.$domain > /tmp/debootstrap/etc/hostname
echo "127.0.0.1 localhost" >> /tmp/debootstrap/etc/hosts
echo "127.0.0.1 $hostname $hostname.$domain" >> /tmp/debootstrap/etc/hosts

# Invert hostname contents to avoid http://projects.puppetlabs.com/issues/2533
tac /tmp/debootstrap/etc/hosts > /tmp/debootstrap/etc/hosts.new
mv /tmp/debootstrap/etc/hosts.new /tmp/debootstrap/etc/hosts

# Initial upgrade.
echo "Applying initial upgrades..."
chroot /tmp/debootstrap/ apt-get update
chroot /tmp/debootstrap/ apt-get upgrade -y
chroot /tmp/debootstrap/ apt-get install locales cryptsetup lvm2 initramfs-tools -y

# Crypttab.
echo "Configuring crypttab..."
echo "# <target name> <source device>   <key file>  <options>" > /tmp/debootstrap/etc/crypttab

if [ "$encrypt" == "y" ]; then
  cat > /tmp/debootstrap/etc/crypttab <<-EOF
root            /dev/mapper/vg-root     none            luks,cipher=aes-cbc-essiv:sha256
EOF
fi

if [ "$home_size" != "0" ] && [ "$encrypt" == "y" ]; then
  cat >> /tmp/debootstrap/etc/crypttab <<-EOF
home            /dev/mapper/vg-home      none            luks,cipher=aes-cbc-essiv:sha256
EOF
fi

if [ "$var_size" != "0" ] && [ "$encrypt" == "y" ]; then
  cat >> /tmp/debootstrap/etc/crypttab <<-EOF
var             /dev/mapper/vg-var       none            luks,cipher=aes-cbc-essiv:sha256
EOF
fi

if [ "$swap" == "y" ]; then
  cat >> /tmp/debootstrap/etc/crypttab <<-EOF
cswap           $swap_device               /dev/random     swap,cipher=aes-cbc-essiv:sha256
EOF
fi

# Fstab.
echo "Configuring fstab..."
echo "" > /tmp/debootstrap/etc/fstab
if [ "$swap" == "y" ]; then
  cat >> /tmp/debootstrap/etc/fstab <<-EOF
/dev/mapper/cswap     none           swap  sw                                 0 0
EOF
fi

if [ "$encrypt" == "y" ]; then
  cat > /tmp/debootstrap/etc/fstab <<-EOF
/dev/mapper/root  /    ext4 defaults,errors=remount-ro 0 1
EOF
else
  cat > /tmp/debootstrap/etc/fstab <<-EOF
/dev/vg/root  /    ext4 defaults,errors=remount-ro 0 1
EOF
fi

if [ "$home_size" != "0" ]; then
  if [ "$encrypt" == "y" ]; then
  cat >> /tmp/debootstrap/etc/fstab <<-EOF
/dev/mapper/home      /home          ext4  defaults,errors=remount-ro         0 2
EOF
  else
  cat >> /tmp/debootstrap/etc/fstab <<-EOF
/dev/vg/home      /home          ext4  defaults,errors=remount-ro         0 2
EOF
  fi
fi

if [ "$var_size" != "0" ]; then
  if [ "$encrypt" == "y" ]; then
  cat >> /tmp/debootstrap/etc/fstab <<-EOF
/dev/mapper/var      /var          ext4  defaults,errors=remount-ro         0 2
EOF
  else
  cat >> /tmp/debootstrap/etc/fstab <<-EOF
/dev/vg/var      /var          ext4  defaults,errors=remount-ro         0 2
EOF
  fi
fi

# Grub.
if [ "$grub" == "y" ]; then
  echo "Boot device setup..."
  hydra_safe_run mkfs.ext4 $boot_device
  hydra_safe_run mount $boot_device /tmp/debootstrap/boot
  echo "$boot_device /boot ext4 defaults,errors=remount-ro 0 2" >> /tmp/debootstrap/etc/fstab

  echo "Setting up GRUB..."
  hydra_safe_run chroot /tmp/debootstrap/ apt-get install grub-pc -y
#  hydra_safe_run grub-install --root-directory=/tmp/debootstrap/boot --no-floppy "$device"
#  mkdir -p /tmp/debootstrap/boot/grub/
#  cat >> /tmp/debootstrap/boot/grub/grub.cfg <<-EOF
#set menu_color_normal=white/blue
#set menu_color_highlight=yellow/red
#
#menuentry 'Standard: $hostname Debian Server' --class debian --class gnu-linux --class gnu --class os {
#	echo	'Debian Server $hostname...'
#  linux /vmlinuz-2.6.32-5-vserver-amd64 root=/dev/mapper/root ro
#	echo	'Loading initial ramdisk...'
#  initrd /initrd.img-2.6.32-5-vserver-amd64-server
#}
EOF
fi

# Kernel.
echo "Installing kernel..."
cat > /tmp/debootstrap/etc/initramfs-tools/modules <<-EOF
dm-mod
dm-crypt
aes
twofish
sha256
EOF

cat > /tmp/debootstrap/etc/kernel-img.conf <<-EOF
do_initrd = Yes
EOF

if [ "$arch" == "i386" ]; then
  kernel_arch="686"
else
  kernel_arch="$arch"
fi

hydra_safe_run chroot /tmp/debootstrap apt-get install linux-image-2.6-vserver-$kernel_arch -y

# Initramfs.
echo "Creating initramfs..."
hydra_safe_run chroot /tmp/debootstrap update-initramfs -v -u

# Utils.
echo "Installing basic utilities..."
chroot /tmp/debootstrap apt-get install screen cron lsb-release openssl -y

# Ssh.
echo "Installing OpenSSH daemon..."
chroot /tmp/debootstrap apt-get install openssh-server -y

echo "OpenSSH fingerprints:"
chroot /tmp/debootstrap ssh-keygen -l -f /etc/ssh/ssh_host_dsa_key.pub
chroot /tmp/debootstrap ssh-keygen -l -f /etc/ssh/ssh_host_rsa_key.pub

# Accounts.
echo "Installing sudo..."
chroot /tmp/debootstrap apt-get install sudo -y

echo "Choose a root password."
chroot /tmp/debootstrap passwd root

cat <<-EOF

Now proceeed with final steps:

  - Create an user account with sudo privileges.
  - Network setup.

See http://padrao.sarava.org/install for more information.
EOF