#!/bin/sh
#
# Simple partitioning shell script.
#
# Copyright 2013 Guilhem Moulin <guilhem@fripost.org>
#
# Licensed under the GNU GPL version 3 or higher.

set -ue

. /lib/fripost-partman/base.sh

# Wipe the disk
device=/dev/sda
fripost_wipe $device


# Create a disk label
/sbin/parted -s $device mklabel gpt
log "Created disklabel GPT for device $device"

# Create a EFI partition if needed; otherwise, create a partition needed
# to put GRUB on GPT disklabels.
if [ -d /proc/efi -o -d /sys/firmware/efi ]; then
    part_efi=$( fripost_mkpart $device efi 256M +boot )
else
    fripost_mkpart $device bios_grub 8M +bios_grub
fi

# Create boot and system partitions
part_boot=$( fripost_mkpart $device boot 64M )
part_system=$( fripost_mkpart $device system 100% ) #+lvm
/sbin/parted -s $device align-check opt ${part_system#$device} \
    || fatal "$part_system is not aligned"


# Encrypt the system partition. We choose the key length and digest
# depending on the architecture we're on; we use AES128 and SHA-256 on
# 32-bits platforms, and AES256 and SHA-512 on 64-bits platforms.
arch=$(uname -m)
if [ x"$arch" = x"x86_64" ]; then
    keysize=256
    hash=sha512
elif [ x"$arch" = x"i386" -o x"$arch" = x"i686" ]; then
    keysize=128
    hash=sha256
fi
# Note: XTS requires the key size to be doubled.
fripost_encrypt $part_system system_crypt \
    --cipher aes-xts-plain64 --key-size $(( $keysize * 2 )) --hash $hash \
    --iter-time 5000 --use-random


# Create logical volumes for /, swap and /home using LVM2
vg=$(hostname)
pvcreate -ff -y /dev/mapper/system_crypt
vgcreate $vg    /dev/mapper/system_crypt

lvcreate -L 5G       -n root $vg
lvcreate -L 1G       -n swap $vg
lvcreate -l 100%FREE -n home $vg
vgchange -ay $vg


# Format the partitions
mkfs.ext2 -q -E resize=512M -m1 -b 4096 $part_boot
mkfs.ext4 -q                    -b 4096 /dev/$vg/root
mkfs.ext4 -q                    -b 4096 /dev/$vg/home
mkswap                                  /dev/$vg/swap


# Stuff the fstab and mount the devices in the target
fripost_fstab $part_boot    /boot ext2 noatime
fripost_fstab /dev/$vg/root /     ext4 noatime,errors=remount-ro
fripost_fstab /dev/$vg/swap none  swap sw
fripost_fstab /dev/$vg/home /home ext4 noatime
fripost_mount_partitions

# TODO: EFI: format, add in fstab, how to populate?