-- psrtition the drive --

fdisk /dev/sda
pvcreate /dev/sda2
vgcreate gentoo /dev/sda2
lvcreate -L 1G -n tmp gentoo
lvcreate -L 4G -n swap gentoo
lvcreate -L 4G -n var_log gentoo
lvcreate -l100%FREE -n root gentoo

-- setup file systems --

mkfs.ext4 /dev/sda1
mkfs.ext4 /dev/gentoo/root
mkfs.ext4 /dev/gentoo/var_log
mkfs.ext4 /dev/gentoo/tmp
mkswap /dev/gentoo/swap
swapon /dev/gentoo/swap

-- mount partitions --

mount /dev/gentoo/root /mnt/gentoo
cd /mnt/gentoo
mkdir -p boot tmp var/log
mount /dev/sda1 /mnt/gentoo/boot
mount /dev/gentoo/var_log /mnt/gentoo/var/log
mount /dev/gentoo/tmp /mnt/gentoo/tmp
chmod 1777 /mnt/gentoo/tmp

-- install systemd stage3 --

cd /root
wget http://spout.ussg.indiana.edu/linux/gentoo/releases/amd64/autobuilds/20180308/systemd/stage3-amd64-systemd-20180308.tar.bz2
wget http://spout.ussg.indiana.edu/linux/gentoo/releases/amd64/autobuilds/20180308/systemd/stage3-amd64-systemd-20180308.tar.bz2.DIGESTS
cat stage3-amd64-systemd-20180308.tar.bz2.DIGESTS
openssl dgst -r -sha512 stage3-amd64-systemd-20180308.tar.bz2

cd /mnt/gentoo
tar xpf /root/stage3-amd64-systemd-20180308.tar.bz2 --xattrs-include='*.*' --numeric-owner

cp --dereference /etc/resolv.conf /mnt/gentoo/etc/

mkdir --parents /mnt/gentoo/etc/portage/repos.conf
cp /mnt/gentoo/usr/share/portage/config/repos.conf /mnt/gentoo/etc/portage/repos.conf/gentoo.conf

-- mount additional filesystems --

mount -t proc none /mnt/gentoo/proc
mount --rbind /dev /mnt/gentoo/dev
mount --rbind /sys /mnt/gentoo/sys

-- enter chroot --

chroot /mnt/gentoo /bin/bash
source /etc/profile
export PS1="(chroot) $PS1"

-- setup portage --

emerge-webrsync

-- ensure mtab is symlink --

ln -sf /proc/self/mounts /etc/mtab

-- configure basic system properties --

nano /etc/hostname
  (no domain name)
nano /etc/hosts
  (domain name here)
nano /etc/fstab
nano /etc/systemd/network/50-dhcp_enp0s3.network

[Match]
Name=enp0s3
 
[Network]
DHCP=yes

nano /etc/portage/make.conf
  add device-mapper to USE variable
  add -march=native to CFLAGS
  ensure CXXFLAGS is the same as CFLAGS
  
passwd

-- install kernel and system tools --

emerge -av gentoo-sources lvm2 linux-firmware genkernel-next cronie mlocate dhcpcd rsyslog grub
nano /etc/genkernel.conf
(lvm udev -> YES)
nano /etc/grub/default
(dolvm and systemd in CMDLINE_LINUX)

-- compile the kernel using genkernel --

genkernel --menuconfig --all
  select systemd from gentoo specific init systems

-- install grub to mbr --
  
mkdir /boot/grub
grub-mkconfig -o /boot/grub/grub.cfg
grub-install /dev/sda
exit
reboot

-- setup systemd services --

systemd-machine-id-setup
localectl set-locale LANG=en_US.utf8

systemctl enable systemd-networkd.service
systemctl enable rsyslog
systemctl enable cronie

-- add normal user account --

useradd -m -G users,wheel,systemd-journal -s /bin/bash syseng
passwd syseng
reboot