install.sh

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

UUID="eppmode@yurij.de"
HELPER_NAME="eppmode-helper"
HELPER_INSTALL_PATH="/usr/local/bin/${HELPER_NAME}"
SUDOERS_FILE="/etc/sudoers.d/eppmode"
STATE_DIR="/var/lib/eppmode"
PPD_UNIT="power-profiles-daemon.service"
PPD_DROPIN_DIR="/etc/systemd/system/${PPD_UNIT}.d"
PPD_DROPIN="${PPD_DROPIN_DIR}/eppmode.conf"

UNITS=(
  eppmode-restore.service
  eppmode-reassert.service
  eppmode-reassert.path
  eppmode-reassert.timer
  eppmode-battery.service
  eppmode-battery.timer
)
UDEV_RULE="99-eppmode-power.rules"
PPD_GUARD_SOURCE="eppmode-ppd-guard.conf"

script_dir="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"

candidates=(
  "${script_dir}/tools"
  "${HOME}/.local/share/gnome-shell/extensions/${UUID}/tools"
  "/usr/share/gnome-shell/extensions/${UUID}/tools"
)

tools_dir=""
for path in "${candidates[@]}"; do
  if [[ -f "${path}/${HELPER_NAME}" ]]; then
    tools_dir="${path}"
    break
  fi
done

if [[ -z "${tools_dir}" ]]; then
  echo "tools/ directory not found. Looked in:" >&2
  printf '  %s\n' "${candidates[@]}" >&2
  exit 1
fi

if ! command -v sudo >/dev/null 2>&1; then
  echo "sudo not found. Install sudo or run this as root." >&2
  exit 1
fi

if [[ ! -d /sys/devices/system/cpu/cpu0/cpufreq ]]; then
  echo "No CPU cpufreq sysfs interface found. Nothing was installed." >&2
  exit 1
fi

if [[ ! -r /sys/devices/system/cpu/cpu0/cpufreq/energy_performance_preference ]]; then
  echo "CPU EPP sysfs interface not found. This tool is intended for systems exposing energy_performance_preference." >&2
  exit 1
fi

target_user="${SUDO_USER:-${USER:-$(id -un)}}"
if [[ -z "${target_user}" ]]; then
  echo "Could not determine target user." >&2
  exit 1
fi

if [[ ! "${target_user}" =~ ^[a-z_][a-z0-9._-]*$ ]]; then
  echo "Refusing to write sudoers for unexpected username: ${target_user}" >&2
  exit 1
fi

echo "Installing helper from ${tools_dir}/${HELPER_NAME} to ${HELPER_INSTALL_PATH}"
sudo install -o root -g root -m 0755 "${tools_dir}/${HELPER_NAME}" "${HELPER_INSTALL_PATH}"

sudo install -d -o root -g root -m 0755 "${STATE_DIR}"
sudo rm -f "${STATE_DIR}/platform-profile-unreliable"

sudo tee "${SUDOERS_FILE}" >/dev/null <<EOF
${target_user} ALL=(root) NOPASSWD: ${HELPER_INSTALL_PATH}
EOF
sudo chmod 0440 "${SUDOERS_FILE}"
sudo visudo -c -f "${SUDOERS_FILE}" >/dev/null

if command -v systemctl >/dev/null 2>&1; then
  if systemctl cat "${PPD_UNIT}" >/dev/null 2>&1; then
    if [[ ! -x /usr/libexec/power-profiles-daemon ]]; then
      echo "Expected /usr/libexec/power-profiles-daemon was not found." >&2
      exit 1
    fi
    sudo install -d -o root -g root -m 0755 "${PPD_DROPIN_DIR}"
    sudo install -o root -g root -m 0644 \
      "${tools_dir}/${PPD_GUARD_SOURCE}" "${PPD_DROPIN}"
  fi

  for unit in "${UNITS[@]}"; do
    echo "Installing ${unit}"
    sudo install -o root -g root -m 0644 "${tools_dir}/${unit}" "/etc/systemd/system/${unit}"
  done

  if [[ -r /sys/firmware/acpi/platform_profile && -r /sys/firmware/acpi/platform_profile_choices ]]; then
    sudo install -o root -g root -m 0644 "${tools_dir}/${UDEV_RULE}" "/etc/udev/rules.d/${UDEV_RULE}"
    if command -v udevadm >/dev/null 2>&1; then
      sudo udevadm control --reload-rules
    fi
  else
    echo "No ACPI platform_profile sysfs interface; skipping udev rule (EPP-only reassertion still applies)." >&2
  fi

  sudo systemctl daemon-reload
  if systemctl cat "${PPD_UNIT}" >/dev/null 2>&1; then
    sudo systemctl restart "${PPD_UNIT}"
  fi
  sudo systemctl enable eppmode-restore.service
  sudo systemctl start eppmode-restore.service
  sudo systemctl enable --now eppmode-reassert.path eppmode-reassert.timer
  sudo systemctl enable --now eppmode-battery.timer
else
  echo "systemctl not found; skipping systemd unit install." >&2
fi

echo "Done."
echo "Restart GNOME Shell or disable/enable the extension."