System Configuration

Set mkinitcpio zfs hook scan path:

echo GRUB_CMDLINE_LINUX=\"zfs_import_dir=${INST_PRIMARY_DISK%/*}\" >> /mnt/etc/default/grub

Generate fstab:

genfstab -U /mnt | sed 's;zfs[[:space:]]*;zfs zfsutil,;g' | grep "zfs zfsutil" >> /mnt/etc/fstab
for i in ${DISK}; do
   echo UUID=$(blkid -s UUID -o value ${i}-part1) /boot/efis/${i##*/}-part1 vfat \
   x-systemd.idle-timeout=1min,x-systemd.automount,noauto,umask=0022,fmask=0022,dmask=0022 0 1 >> /mnt/etc/fstab
done
echo UUID=$(blkid -s UUID -o value ${INST_PRIMARY_DISK}-part1) /boot/efi vfat \
x-systemd.idle-timeout=1min,x-systemd.automount,noauto,umask=0022,fmask=0022,dmask=0022 0 1 >> /mnt/etc/fstab
if [ "${INST_PARTSIZE_SWAP}" != "" ]; then
 for i in ${DISK}; do
  echo ${i##*/}-part4-swap ${i}-part4 /dev/urandom swap,cipher=aes-cbc-essiv:sha256,size=256,discard >> /mnt/etc/crypttab
  echo /dev/mapper/${i##*/}-part4-swap none swap defaults 0 0 >> /mnt/etc/fstab
 done
fi

By default, systemd will halt boot process if any entry in /etc/fstab fails to mount. This is unnecessary for mirrored EFI boot partitions. With the above mount options, systemd will skip mounting them at boot, only mount them on demand when accessed.

Configure mkinitcpio:

mv /mnt/etc/mkinitcpio.conf /mnt/etc/mkinitcpio.conf.original
tee /mnt/etc/mkinitcpio.conf <<EOF
HOOKS=(base udev autodetect modconf block keyboard zfs filesystems)
EOF

Enable DHCP on all ethernet ports:
```
tee /mnt/etc/systemd/network/20-default.network <<EOF

[Match]
Name=en*
Name=eth*

[Network]
DHCP=yes
EOF
systemctl enable systemd-networkd systemd-resolved --root=/mnt
```
Customize this file if the system is not using wired DHCP network. See Network Configuration.

Alternatively, install a network manager such as NetworkManager.

Enable internet time sync:

hwclock --systohc
systemctl enable systemd-timesyncd --root=/mnt

Interactively set locale, keymap, timezone, hostname and root password:

rm -f /mnt/etc/localtime
systemd-firstboot --root=/mnt --force --prompt --root-password=PASSWORD

This can be non-interactive, see man page for details:

rm -f /mnt/etc/localtime
systemd-firstboot --root=/mnt --force \
 --locale="en_US.UTF-8" --locale-messages="en_US.UTF-8" \
 --keymap=us --timezone="Europe/Berlin" --hostname=myHost \
 --root-password=PASSWORD --root-shell=/bin/bash

systemd-firstboot has bugs for setting root password, reset it here:

arch-chroot /mnt passwd

Generate host id:
```
zgenhostid -f -o /mnt/etc/hostid
```

Ignore kernel updates:

sed -i 's/#IgnorePkg/IgnorePkg/' /mnt/etc/pacman.conf
sed -i "/^IgnorePkg/ s/$/ ${INST_LINVAR} ${INST_LINVAR}-headers zfs-${INST_LINVAR} zfs-utils/" /mnt/etc/pacman.conf

Kernel will be updated manually. See here.

Enable ZFS services:
```
systemctl enable zfs-import-scan.service zfs-import.target zfs-zed zfs.target --root=/mnt
systemctl disable zfs-mount --root=/mnt
```
At boot, datasets on rpool are mounted with /etc/fstab, which can control the mounting process more precisely than zfs-mount.service.

Chroot:

echo "INST_PRIMARY_DISK=$INST_PRIMARY_DISK
INST_LINVAR=$INST_LINVAR
INST_UUID=$INST_UUID
INST_ID=$INST_ID
INST_VDEV=$INST_VDEV
DISK=$DISK" > /mnt/root/chroot
arch-chroot /mnt bash --login

Source variables:
```
source /root/chroot
```

Apply locales, change if needed:

echo "en_US.UTF-8 UTF-8" >> /etc/locale.gen
locale-gen

Add archzfs repo.