system-install

#!/usr/bin/env bash
set -euo pipefail

mount=/mnt

# * Helper Functions
check_connection() {
	# ping default gateway; http://stackoverflow.com/a/932187/2744245
	ping -c 1 -q "$(ip r | awk '/default/ {print $3}')" &> /dev/null
}

boot_efi_home_exist() {
	[[ -d "$mount"/boot ]] && [[ -d "$mount"/boot/efi ]] \
		&& [[ -d "$mount"/home ]]
}

prompt_continue() {
	echo "continue? [y/n]"
	read -r reply
	if [[ $reply != y ]]; then
		exit 0
	fi
}

# * Base Install
base_install() {
	# removed -c (use host package cache) because not enough space on live usb
	# with the base group, the first initramfs will be generated and installed
	# to the new system's boot path
	# use host's package cache
	# include some packages from old base group including linux kernel
	pacstrap -i "$mount" base base-devel \
			 cryptsetup diffutils e2fsprogs less linux linux-firmware \
			 logrotate lvm2 man-db man-pages texinfo vi which
}

# * Chroot
chroot_setup() {
	arch-chroot "$mount" /bin/bash
}

# * Main
main() {
	if [[ $EUID -ne 0 ]]; then
		echo "Please run this script as root."
		exit 1
	fi
	if ! boot_efi_home_exist; then
		echo "Please make sure that all partitions are mounted under $mount
(including the ESP as $mount/boot/EFI)."
		echo "Using 'lsblk -o name,label,size' may be useful to determine how
		which partitions are which."
		exit 1
	fi
	if ! check_connection; then
		echo "Please connect to the internet before continuing."
		exit 1
	fi

	echo "Please read notes on installation and read the wiki for any changes.
- [[file:~/ag-sys/else/arch_and_program_info.org::*Arch%20Installation][Arch
	Installation]]
- https://wiki.archlinux.org/index.php/Installation_guide"

	echo

	echo "This script does the following setup:
- Performs base installation with pacstrap
- Chroots into $mount with arch-chroot

NOTE: This script is not sufficient for a working installation. Please run the
post-install script from inside the chroot after this script. It will set the
timezone, hostname, install the bootloader, update the initramfs, create the
main user, etc.

Please create a new user before running the post-install script:
- useradd user
- passwd user

Please also confirm and sign extra keys for pacman (see ./pacman-keys).

If installing from existing system, consider copying over /var/lib/connman.

After running the post-install script, you should do the following:
- exit the chroot with 'exit'
- umount mounted partitions with 'umount -R /mnt'
- reboot"
	prompt_continue
	base_install
	chroot_setup
}

main