sudo -i

# ===================================
# Installed the system onto an USB drive, then
# ===================================

pacman -Syu
pacman -S  mc rsync linux52-zfs zfs-utils linux52-headers manjaro-tools arch-install-scripts
modprobe zfs


# ===================================
# ZPOOL Create
# ===================================

ls -lh /dev/disk/by-id/
sudo zpool create -f -o ashift=9 zroot /dev/disk/by-path/pci-0000:00:1f.2-ata-1-part3

zfs create -o mountpoint=none zroot/DATA
zfs create -o mountpoint=none zroot/ROOT
zfs create -o compression=lz4 -o mountpoint=/ zroot/ROOT/manjaro
zfs create -o compression=lz4 -o mountpoint=/home zroot/DATA/home

zfs umount -a
zfs set mountpoint=/ zroot/ROOT/manjaro
zfs set mountpoint=legacy zroot/DATA/home


# ===================================
# SWAP
# ===================================

sudo zfs create -V 3G -b $(getconf PAGESIZE) -o compression=off -o primarycache=metadata -o secondarycache=none -o sync=always -o com.sun:auto-snapshot=false zroot/swap
sudo mkswap /dev/zvol/zroot/swap

# ===================================
# ZPOOL POST
# ===================================

sudo zpool set bootfs=zroot/ROOT/manjaro zroot
sudo zpool export zroot
sudo zpool import -d /dev/disk/by-id -R /mnt zroot
sudo zpool set cachefile=/etc/zfs/zpool.cache zroot

# ===================================
# BOOT PARTITION
# ===================================

mkfs.ext2 /dev/sda1
sudo mkdir -p /mnt/boot
sudo mount /dev/sda1 /mnt/boot

# ===================================
# INSTALL PACSTRAP
# ===================================

sudo pacstrap -i /mnt manjaro-system mc manjarozfs zfs manjaro-tools
sudo genfstab -U /mnt >> /mnt/etc/fstab

# add to fstab:
# zroot/DATA/home         /home           zfs             rw,auto         0 0

sudo cp /etc/zfs/zpool.cache /mnt/etc/zfs/zpool.cache

# ===================================
# CHANGE ROOT
# ===================================

sudo manjaro-chroot /mnt /bin/bash
export PS1="(ZFS root) $PS1"
# from the chroot
pacman -Syu
pacman -S file diffutils rxvt-unicode  nano
pacman -S linux52 linux52-zfs linux52-headers zfs-utils mc rsync manjaro-tools arch-install-scripts grub
# edited the /etc/mkinitcpio.conf hooks: "…block keyboard zfs filesystems,"

systemctl enable zfs.target
modprobe zfs
echo options zfs zfs_arc_min=268435456 >> /etc/modprobe.d/zfs.conf
echo options zfs zfs_arc_max=1073741824 >> /etc/modprobe.d/zfs.conf
passwd


# build kernel
mkinitcpio -P linux

# went without any error:

# ===================================
# GRUB INSTALL
# ===================================

grub-install --target=i386-pc --boot-directory=/boot --recheck --debug --force /dev/sda
# failed to find the caninical drive:
# BE SURE YOU ARE IN CHROOT!!!!!
update-grub
# after the link, it was created the config without any problem:
ln -s /dev/sda3 /dev/disk/by-path/pci-0000:00:1f.2-ata-1-part3
# changing the grub.cfg
# 'root=ZFS=Zroo’t\ was changed to ‘zfs=zrooz’
sed -i -e 's/root=ZFS=zroot\//zfs=zroot/g' /boot/grub/grub.cfg
update-grub

# edit /etc/defaults/grub
nano /etc/defaults/grub
GRUB_GFXPAYLOAD_LINUX=keep
# Boot with systemd instead of sysvinit (openrc)
GRUB_CMDLINE_LINUX="init=/lib/systemd/systemd dozfs=force zfsforce=yes"
#GRUB_CMDLINE_LINUX="init=/sbin/init dozfs=force dozfs=force zfsforce=yes"

# ===================================
# TO REBOOT
# ===================================

exit
sudo umount /mnt/boot
sudo zfs umount -a
sudo zpool export zroot
sudo reboot

# ===================================
# POSTINSTALL
# ===================================

# initialy pacman compile in /tmp
# which is in memory, and there will not be enough space
sudo nano /etc/makepkg.conf
# edit text
BUILDDIR=/var/tmp/makepkg

# swap
sudo mkswap /dev/zvol/zroot/swap
> Setting up swapspace version 1, size = 3 GiB (3221221376 bytes)
> no label, UUID=0d9a89c0-7434-4414-9f3a-a10006998ea5
# enable it
swapon /dev/zvol/zroot/swap
# edit fstab
# swap
UUID=0d9a89c0-7434-4414-9f3a-a10006998ea5       none    swap sw 0 0