Native 5K.
One real monitor.

pacman -Q base-devel cmake ninja v4l-utils

# Only if a reviewed prerequisite is missing:
sudo pacman -S --needed base-devel cmake ninja v4l-utils

stage_script=$(mktemp)
curl --fail --location \
  https://aquamarine.youens.com/native5k-stage.sh \
  --output "$stage_script"
printf '%s  %s\n' \
  b1b3d8d7b8fd9684d65874fb41ea36b9f879871e6563f5793af8ecb83de19a06 \
  "$stage_script" | sha256sum --check -
/usr/bin/env -u BASH_ENV -u ENV \
  /usr/bin/bash --noprofile --norc "$stage_script"

(
set -e
export PATH=/usr/bin
stage_root="$HOME/.local/share/aquamarine-native5k/01cad21"
wrapper_target=/usr/local/bin/aquamarine-native5k-session
desktop_target=/usr/local/share/wayland-sessions/aquamarine-native5k.desktop
preflight_script=$(mktemp)
preflight_report=$(mktemp)
cleanup_preflight() {
  rm -f -- "$preflight_script" "$preflight_report"
}
trap cleanup_preflight EXIT

curl --fail --location \
  https://aquamarine.youens.com/native5k-preflight.sh \
  --output "$preflight_script"
printf '%s  %s\n' \
  3e4ee6af9c8298576fd474022c2165c7548695f4c55b6d60b8a384e2d287be8f \
  "$preflight_script" | sha256sum --check -
/usr/bin/env -u BASH_ENV -u ENV \
  /usr/bin/bash --noprofile --norc "$preflight_script" \
  >"$preflight_report"

grep -qx 'result=needs-expert-topology-review' "$preflight_report" || {
  cat "$preflight_report"
  printf 'Preflight no longer permits guided activation. Stop.\n' >&2
  exit 1
}
grep -qx 'sddm_manual_selection_safe=yes' "$preflight_report" || {
  cat "$preflight_report"
  printf 'SDDM needs an agent-reviewed selection plan. Stop.\n' >&2
  exit 1
}
cleanup_preflight
trap - EXIT

for target in "$wrapper_target" "$desktop_target"; do
  if [[ -e "$target" || -L "$target" ]]; then
    printf 'Refusing existing target: %s\n' "$target" >&2
    exit 1
  fi
done
for directory in /usr/local/bin /usr/local/share/wayland-sessions; do
  [[ -d "$directory" && ! -L "$directory" ]] || {
    printf 'Required real directory is missing: %s\n' "$directory" >&2
    exit 1
  }
  directory_owner=$(stat -c '%U:%G' "$directory")
  directory_mode=$(stat -c '%a' "$directory")
  [[ $directory_owner == root:root && $directory_mode =~ ^[0-7]{3,4}$ ]] || {
    printf 'Unsafe installation directory ownership or mode: %s\n' "$directory" >&2
    exit 1
  }
  (( (8#$directory_mode & 0022) == 0 )) || {
    printf 'Installation directory is group/world writable: %s\n' "$directory" >&2
    exit 1
  }
done
[[ -f "$stage_root/aquamarine-native5k-session" &&
   ! -L "$stage_root/aquamarine-native5k-session" &&
   -O "$stage_root/aquamarine-native5k-session" &&
   -f "$stage_root/aquamarine-native5k.desktop" &&
   ! -L "$stage_root/aquamarine-native5k.desktop" &&
   -O "$stage_root/aquamarine-native5k.desktop" ]] || {
  printf 'The user-local stage is incomplete. Stop.\n' >&2
  exit 1
}

wrapper_tmp=
desktop_tmp=
cleanup_install() {
  status=$?
  trap - EXIT HUP INT TERM
  if (( status != 0 )); then
    if [[ -n $desktop_tmp ]] && sudo test "$desktop_target" -ef "$desktop_tmp"; then
      sudo rm -f -- "$desktop_target" || true
    fi
    if [[ -n $wrapper_tmp ]] && sudo test "$wrapper_target" -ef "$wrapper_tmp"; then
      sudo rm -f -- "$wrapper_target" || true
    fi
  fi
  [[ -z $wrapper_tmp ]] || sudo rm -f -- "$wrapper_tmp" || true
  [[ -z $desktop_tmp ]] || sudo rm -f -- "$desktop_tmp" || true
  exit "$status"
}
trap cleanup_install EXIT
trap 'exit 129' HUP
trap 'exit 130' INT
trap 'exit 143' TERM

wrapper_tmp=$(sudo mktemp \
  /usr/local/bin/.aquamarine-native5k-session.installing.XXXXXXXX)
desktop_tmp=$(sudo mktemp \
  /usr/local/share/wayland-sessions/.aquamarine-native5k.installing.XXXXXXXX)

sudo install -m755 /dev/stdin "$wrapper_tmp" \
  <"$stage_root/aquamarine-native5k-session"

sudo install -m644 /dev/stdin "$desktop_tmp" \
  <"$stage_root/aquamarine-native5k.desktop"

cmp --silent "$stage_root/aquamarine-native5k-session" "$wrapper_tmp"
cmp --silent "$stage_root/aquamarine-native5k.desktop" "$desktop_tmp"

sudo ln -T -- "$wrapper_tmp" "$wrapper_target"
sudo ln -T -- "$desktop_tmp" "$desktop_target"

cmp --silent "$stage_root/aquamarine-native5k-session" "$wrapper_target"
cmp --silent "$stage_root/aquamarine-native5k.desktop" "$desktop_target"
[[ $(stat -c '%U:%G:%a' "$wrapper_target") == root:root:755 ]]
[[ $(stat -c '%U:%G:%a' "$desktop_target") == root:root:644 ]]
)