#!/usr/bin/bash -eu
#
# Author: Casey DeLorme
#
# This is used by my packer build, but is wired to work for a complete install.
#
# Description: Thse are the pre-installation steps for Arch, where you may have
# launched the iso and have a terminal, but you're working off a live system
# and still need to partition the disk.
#
# Warning: This installation is wired for efi mode installations.  While it
# may print a warning it won't stop the installation and may leave you with
# a derelict system.
#
# Warning: This currently uses /dev/sda explicitly and may delete data or fail
# if there are multiple disks connected or you are using alternative storage
# such as M.2/NVME.

[ ! -f /sys/firmware/efi/efivars ] && echo "efivars not mounted and this install may leave you with a derelict system..."

# optionally print all commands
[ -n "$DEBUG" ] && set -x

# test network connection
ping -c 3 archlinux.org

# synchronize time (print for debug)
timedatectl set-ntp true
timedatectl status

# @todo: future editions will intelligently check available disks,
# may ask which disk to use, may detect if running on a laptop,
# may automatically choose or ask if swap should be sized for
# hibernation, and appropriately modify partition logic.

# partition the hard drive
parted /dev/sda -s 'mklabel gpt'
parted /dev/sda -s 'mkpart primary fat32 1MiB 1024MiB'
parted /dev/sda -s 'set 1 esp on'
parted /dev/sda -s 'mkpart primary linux-swap 1024MiB 3072MiB'
parted /dev/sda -s 'mkpart primary btrfs 3072MiB 100%'

# format the partitions
mkfs.fat -F32 -nEFI /dev/sda1
mkswap -Larch /dev/sda2
mkfs.btrfs -fLarch /dev/sda3

# enable and mount partitions with appropriate settings
swapon /dev/sda2
mount -o "noatime,compress=lzo,space_cache,autodefrag,ssd" /dev/sda3 /mnt
mkdir /mnt/boot
mount /dev/sda1 /mnt/boot

# install base and base-devel package sets, and generate the fstab
pacstrap /mnt base base-devel
genfstab -U -p /mnt >> /mnt/etc/fstab

# this assumes that arch.sh and install/ exists and will copy them to continue
# @note: would prefer to copy to `/tmp` but `/mnt/tmp` from iso is a separate tmpfs
mkdir -p /mnt/srv/arch-desktop
cp -r install /mnt/srv/arch-desktop/
cp arch.sh /mnt/srv/arch-desktop/

# proceed to automate arch-chroot installation then umount and reboot with an async delay
arch-chroot /mnt /srv/arch-desktop/arch.sh
umount -R /mnt
(sleep 5 && systemctl reboot) &