Dual boot OSX with archlinux using zfs on crypted disks

dual booting arch and osx using crypted zfs

# resize OSX partition (disable filevault if enabled)

# enable support for OSX
pacman-key -r 0EE7A126
pacman-key --lsign-key 0EE7A126

cat<<EOF>>/etc/pacman.conf
[archzfs] 
Server = http://archzfs.com/$repo/x86_64 
EOF

pacman -Sy zfs-linux
modprobe zfs

# create two new partitions
/boot - 250MB - type 8300 (Linux)
root_crypt - the rest - type BF00 (Solaris root)

# if you're lucky you'll end up with something just like this
Device         Start       End   Sectors   Size Type
/dev/sda1         40    409639    409600   200M EFI System
/dev/sda2     409640 488757327 488347688 232.9G Apple Core storage
/dev/sda3  488757328 490026863   1269536 619.9M Apple boot
/dev/sda4  490026864 491075439   1048576   512M Linux filesystem
/dev/sda5  491075440 977105026 486029587 231.8G Solaris root

# format boot partition
mkfs.ext4 -L boot /dev/sda4


# create luks and open it
cryptsetup luksFormat -c aes-xts-plain64 -s 512 -h sha512 /dev/sda5
cryptsetup luksOpen /dev/sda5 root_crypt


# create zfs filesystem in 
pool create -f -o ashift=12 -O compression=lz4 -o cachefile=/etc/zfs/zroot.cache  -m none -R /mnt zroot /dev/mapper/root_crypt
zfs create -V 8G -b 4K zroot/swap 
mkswap /dev/zvol/zroot/swap

zfs create zroot/home -o mountpoint=/home
zfs create zroot/root -o mountpoint=/root
cp /etc/zfs/zroot.cache /tmp/zroot.cache
zfs umount -a
rmdir /mnt/{home,root}

zfs set mountpoint=/ zroot	#ignore error
zpool set bootfs=zroot zroot
#swapoff /dev/zvol/zroot/swap #if it doesn't want to export
zpool export zroot
zpool import -d /dev/mapper -R /mnt zroot
mkdir /mnt/etc
mkdir /mnt/etc/zfs
cp /tmp/zroot.cache /mnt/etc/zfs/zroot.cache

# mount boot and efi
mkdir /mnt/boot 
mount /dev/sda4 /mnt/boot 
mkdir /mnt/boot/efi
mount /dev/sda1 /mnt/boot/efi

# do base install
pacstrap -i /mnt base

# add fstab entries
genfstab -U -p /mnt | grep boot >> /mnt/etc/fstab 

# add the following to fstab as well:
/dev/mapper/root_crypt / zfs defaults 0 0
/dev/zvol/zroot/swap none swap defaults 0 0 


modprobe efivarfs
arch-chroot /mnt /bin/bash

# at this point lts is easier to get working with zfs