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

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

MOUNT_STATE_FILE="${PROJECT_DIR}/.sd-mount"

if [ ! -f "$MOUNT_STATE_FILE" ]; then
  echo "No SD card mount recorded. Nothing to unmount."
  exit 0
fi

SD_MOUNT="$(cat "$MOUNT_STATE_FILE")"

if mountpoint -q "$SD_MOUNT" 2>/dev/null; then
  echo "Unmounting $SD_MOUNT ..."
  sudo umount "$SD_MOUNT"
  echo "Unmounted. Safe to remove the SD card."
else
  echo "$SD_MOUNT is not currently mounted."
fi

rm -f "$MOUNT_STATE_FILE"
echo "Cleaned up mount state."