preinstall.sh

#!/usr/bin/env bash
#-------------------------------------------------------------------------
#      _          _    __  __      _   _
#     /_\  _ _ __| |_ |  \/  |__ _| |_(_)__
#    / _ \| '_/ _| ' \| |\/| / _` |  _| / _|
#   /_/ \_\_| \__|_||_|_|  |_\__,_|\__|_\__|
#  Arch Linux Post Install Setup and Config
#-------------------------------------------------------------------------

echo "-------------------------------------------------"
echo "Setting up mirrors for optimal download - US Only"
echo "-------------------------------------------------"
timedatectl set-ntp true
pacman -S --noconfirm pacman-contrib
pacman -S --noconfirm reflector rsync
mv /etc/pacman.d/mirrorlist /etc/pacman.d/mirrorlist.backup
reflector -a 48 -c us -f 5 -l 20 --sort rate --save /etc/pacman.d/mirrorlist
mkdir /mnt


echo -e "\nInstalling prereqs...\n$HR"
pacman -S --noconfirm gptfdisk btrfs-progs

echo "-------------------------------------------------"
echo "-------select your disk to format----------------"
echo "-------------------------------------------------"
lsblk
echo "Please enter disk to work on: (example /dev/sda)"
read DISK
echo "THIS WILL FORMAT AND DELETE ALL DATA ON THE DISK"
read -p "are you sure you want to continue (Y/N):" formatdisk
case $formatdisk in

y|Y|yes|Yes|YES)
echo "--------------------------------------"
echo -e "\nFormatting disk...\n$HR"
echo "--------------------------------------"

# disk prep
sgdisk -Z ${DISK} # zap all on disk
sgdisk -a 2048 -o ${DISK} # new gpt disk 2048 alignment

# create partitions
sgdisk -n 1:0:+1000M ${DISK} # partition 1 (UEFI SYS), default start block, 512MB
sgdisk -n 2:0:0     ${DISK} # partition 2 (Root), default start, remaining

# set partition types
sgdisk -t 1:ef00 ${DISK}
sgdisk -t 2:8300 ${DISK}

# label partitions
sgdisk -c 1:"UEFISYS" ${DISK}
sgdisk -c 2:"ROOT" ${DISK}

# make filesystems
echo -e "\nCreating Filesystems...\n$HR"

mkfs.vfat -F32 -n "UEFISYS" "${DISK}1"
mkfs.btrfs -L "ROOT" "${DISK}2"
mount -t btrfs "${DISK}2" /mnt
btrfs subvolume create /mnt/@
umount /mnt
;;
esac

# mount target
mount -t btrfs -o subvol=@ "${DISK}2" /mnt
mkdir /mnt/boot
mkdir /mnt/boot/efi
mount -t vfat "${DISK}1" /mnt/boot/

echo "--------------------------------------"
echo "-- Arch Install on Main Drive       --"
echo "--------------------------------------"
pacstrap /mnt base base-devel linux linux-firmware vim nano sudo --noconfirm --needed
genfstab -U /mnt >> /mnt/etc/fstab
arch-chroot /mnt

echo "--------------------------------------"
echo "-- Bootloader Systemd Installation  --"
echo "--------------------------------------"
bootctl install
cat <<EOF > /boot/loader/entries/arch.conf
title Arch Linux  
linux /vmlinuz-linux  
initrd  /initramfs-linux.img  
options root=${DISK}1 rw
EOF

echo "--------------------------------------"
echo "--          Network Setup           --"
echo "--------------------------------------"
pacman -S networkmanager dhclient --noconfirm --needed
systemctl enable --now NetworkManager

echo "--------------------------------------"
echo "--      Set Password for Root       --"
echo "--------------------------------------"
echo "Enter password for root user: "
passwd root

exit
umount -R /mnt

echo "--------------------------------------"
echo "--   SYSTEM READY FOR FIRST BOOT    --"
echo "--------------------------------------"