#!/bin/bash
#
# Purpose : Turn Arch's cloud image into the machine CoreDesktop's README starts
#           from: Arch with archinstall's desktop profile and GNOME. Run as root
#           in the VM while building the smoketest's base image.
#
# Differences from a real archinstall machine, on purpose: the user (tester)
# logs in to GNOME automatically and has passwordless sudo, so the smoketest
# runs without anyone at the keyboard.

set -euo pipefail

USER_NAME=tester

echo "== Growing / to fill the disk"
btrfs filesystem resize max / || echo "Couldn't grow /; continuing."
df -h /

echo "== Sharing the host's package cache"
if ! grep -q '^pkgcache ' /etc/fstab; then
  echo 'pkgcache /var/cache/pacman/pkg 9p trans=virtio,version=9p2000.L,msize=524288,nofail 0 0' >> /etc/fstab
fi
systemctl daemon-reload
mountpoint -q /var/cache/pacman/pkg || mount /var/cache/pacman/pkg \
  || echo "No shared package cache; packages download into the VM."

echo "== Installing GNOME"
pacman -Sy --needed --noconfirm archlinux-keyring
# archinstall's desktop profile with GNOME, NetworkManager and PipeWire
pacman -Su --needed --noconfirm \
  gnome gnome-tweaks gdm \
  networkmanager \
  pipewire pipewire-alsa pipewire-pulse pipewire-jack wireplumber \
  base-devel git sudo openssh nano vim htop wget smartmontools xdg-utils

echo "== Locale"
sed -i 's/^#en_US.UTF-8 UTF-8/en_US.UTF-8 UTF-8/' /etc/locale.gen
locale-gen
echo LANG=en_US.UTF-8 > /etc/locale.conf

echo "== NetworkManager instead of systemd-networkd"
systemctl disable systemd-networkd.service systemd-networkd.socket systemd-resolved.service || true
# NetworkManager writes its own resolv.conf; the cloud image's points at
# systemd-resolved
rm -f /etc/resolv.conf
systemctl enable NetworkManager.service gdm.service sshd.service

echo "== Automatic login to GNOME as $USER_NAME"
cat > /etc/gdm/custom.conf << EOF
[daemon]
AutomaticLoginEnable=True
AutomaticLogin=$USER_NAME
EOF

echo "== Smoketest folder"
install -d -o "$USER_NAME" -g "$USER_NAME" /srv/smoketest

# cloud-init has done its job (the user, their SSH key and sudo rights)
touch /etc/cloud/cloud-init.disabled

echo "== Done"