# Rather convoluted LVM-on-MD-on-LUKS2 layout with 2 swap areas, /boot
# on RAID1, SWAP0 on RAID0, LVM on RAID1 and 4 independently encrypted
# partitions decrypt at early boot stage:

#    NAME                 TYPE  MOUNTPOINTS
#    vda                  disk
#    ├─vda1               part
#    ├─vda2               part
#    │ └─md0              raid1 /boot
#    ├─vda3               part
#    │ └─vda3_crypt       crypt
#    │   └─md1            raid0 [SWAP]
#    └─vda4               part
#      └─vda4_crypt       crypt
#        └─md2            raid1
#          ├─cryptvg-swap lvm   [SWAP]
#          └─cryptvg-root lvm   /
#    vdb                  disk
#    ├─vdb1               part
#    ├─vdb2               part
#    │ └─md0              raid1 /boot
#    ├─vdb3               part
#    │ └─vdb3_crypt       crypt
#    │   └─md1            raid0 [SWAP]
#    └─vdb4               part
#      └─vdb4_crypt       crypt
#        └─md2            raid1
#          ├─cryptvg-swap lvm   [SWAP]
#          └─cryptvg-root lvm   /

sfdisk --append /dev/vda <<-EOF
	unit: sectors

	start=$((64*1024*2)), size=$((128*1024*2)), type=${GUID_TYPE_Linux_FS}
	start=$(((64+128)*1024*2)), size=$((64*1024*2)), type=${GUID_TYPE_LUKS}
	start=$(((64+128+64)*1024*2)), type=${GUID_TYPE_LUKS}
EOF
udevadm settle

# copy vda's partition table onto vdb
sfdisk -d /dev/vda | sfdisk /dev/vdb
udevadm settle

for d in vda3 vda4 vdb3 vdb4; do
  echo -n "${d}_crypt" >/keyfile
    cryptsetup luksFormat --batch-mode \
        --key-file=/keyfile \
        --type=luks2 \
        --pbkdf=argon2id \
        --pbkdf-force-iterations=4 \
        --pbkdf-memory=32 \
        -- "/dev/$d"
    cryptsetup luksOpen --key-file=/keyfile --allow-discards \
        -- "/dev/$d" "${d}_crypt"
    udevadm settle
done

mdadm --create /dev/md0 --metadata=default --level=1 --raid-devices=2 /dev/vda2 /dev/vdb2
mdadm --create /dev/md1 --metadata=default --level=0 --raid-devices=2 /dev/mapper/vda3_crypt /dev/mapper/vdb3_crypt
mdadm --create /dev/md2 --metadata=default --level=1 --raid-devices=2 /dev/mapper/vda4_crypt /dev/mapper/vdb4_crypt
udevadm settle

lvm pvcreate /dev/md2
lvm vgcreate "cryptvg" /dev/md2
lvm lvcreate -Zn --size 64m --name "swap" "cryptvg"
lvm lvcreate -Zn -l100%FREE --name "root" "cryptvg"
lvm vgchange -ay "cryptvg"
lvm vgmknodes
udevadm settle


mke2fs -Ft ext4 /dev/cryptvg/root
mount -t ext4 /dev/cryptvg/root "$ROOT"

mkdir "$ROOT/boot"
mke2fs -Ft ext2 -m0 /dev/md0
mount -t ext2 /dev/md0 "$ROOT/boot"

mkswap /dev/cryptvg/swap
swapon /dev/cryptvg/swap
mkswap /dev/md1
swapon /dev/md1

# vim: set filetype=sh :