#!/bin/sh

[ "$(id -un)" = "root" ] || { echo "User must be root"; exit 1; }
: "${DEVICE:?DEVICE must be set}"
exit # Dont run as script


# Use virt-manager for spinning up a virtual machine. Do this without the
# assistance of an LLM. This defeats the purpose entirely. If you decide to get
# help from an LLM, just skip this exercise instead as it will be of no use.

# Reference:
# - https://wiki.archlinux.org/title/Installation_guide

# Some usefull commands:
#   - lsblk
#   - fdisk -l
#   - mkfs.* (ext4 in our case)

# What is a qcow2 file?
# Where are qcow2 files stored by default?
# How would you share your qcow2 file with someone?

# First, set the keymap (temporary)
loadkeys sv-latin1

# For sshd:
# Figure out where the config for sshd is located
# Edit it, make sure 'PermitRootLogin' is set to yes, and is uncommented
# Figure out how to reload the sshd daemon with the new config (hint: systemctl)
# Figure out what your local ip is

# We dont want efi boot, if /sys/firmware/efi exists, this means we have booted
# in efi mode
# ls /sys/firmware/efi && echo "ERROR: Booted in UEFI" && exit 1
[ -d /sys/firmware/efi ] || { echo "ERROR: Booted in UEFI"; exit 1; }

# Often /dev/vda in a kvm machine

# What are disk partitions? What are block devices?
# ${DEVICE}1 -> /boot (512M)
# ${DEVICE}2 -> /
fdisk ${DEVICE}
#   o
#   n p 1 <enter> +512M
#   n p 2 <enter> <enter>
#   a 1
#   w

# Check with
# fdisk -l
# lsblk

# Format the new partition with the ext4 file system
mkfs.ext4 ${DEVICE}1
mkfs.ext4 ${DEVICE}2

# What does mounting mean?
mount ${DEVICE}2 /mnt
mkdir /mnt/boot
mount ${DEVICE}1 /mnt/boot

# What does pacstrap do? What are all those packages?
# This command does a lot of the heavy lifting
pacstrap /mnt base linux linux-firmware grub

# What is fstab? Why do we need it?
genfstab -U /mnt >> /mnt/etc/fstab
# Inspect it,see what the new fstab looks like

# Everything from now on is in chroot
# What is a chroot?
arch-chroot /mnt

ln -sf /usr/share/zoneinfo/Europe/Stockholm /etc/localtime
hwclock --systohc
# Or timedatectl

echo "en_US.UTF-8 UTF-8" >> /etc/locale.gen
echo "LANG=en_US.UTF-8" > /etc/locale.conf
locale-gen
echo "KEYMAP=sv-latin1" > /etc/vconsole.conf

# What is /etc/hostname?
# What is /etc/hosts?
echo "arch" > /etc/hostname
cat <<EOF > /etc/hosts
127.0.0.1   localhost
::1         localhost
127.0.1.1   archbox.local arch
EOF

# Set the root password for the chroot
passwd root

# Generate our initramfs
mkinitcpio -P # Like dracut -f in fedora

# What is grub? Why do we specify a device here? What is actually installed?
grub-install ${DEVICE}
grub-mkconfig -o /boot/grub/grub.cfg

# What is DHCP?
pacman -S dhcpcd

# What is systemctl?
systemctl enable dhcpcd

# What is openssh?
pacman -S openssh

# What is sshd?
systemctl enable sshd

exit # Exit the chroot

# What does umount do?
umount -R /mnt # Not strictly necessary

# Our disk now contains a fully-featured linux system
# Virt-namager will remove our boot iso, and boot into our new system
reboot

# We used ext4 for both root and boot partitions. What other filesystems are available in linux?
# Why did we use two partitions? What other partitions are common?
# We did not use a swap partition. What is a swap partition?
# Fedora does not use a swap partition. What does it use instead, and how does it differ?