#!/bin/bash
# Remove-trigger cleanup for the dashcam SD card.
# Called by udev rule 99-dashcam-trigger.rules via systemd-run on
# ACTION=="remove" with %k as $1. Unmounts a stale /mnt/sdcard mount and
# stops a transfer that can no longer complete.
# Idempotent: does nothing when /mnt/sdcard is not mounted or still healthy.
logger -t dashcam-transfer "Remove trigger: block device weggevallen"

src=$(findmnt -no SOURCE /mnt/sdcard 2>/dev/null)
if [ -z "$src" ]; then
    logger -t dashcam-transfer "Remove: /mnt/sdcard niet gemount, niets te doen"
    exit 0
fi

case "$src" in
    /*) ;;
    *) logger -t dashcam-transfer "Remove: onbekende source ($src), niets te doen"; exit 0 ;;
esac

stale=0
if [ ! -e "$src" ]; then
    stale=1
elif [ -n "$1" ] && [[ "$src" == *"/$1"* ]]; then
    stale=1
fi

if [ "$stale" -eq 0 ]; then
    logger -t dashcam-transfer "Remove: device $src nog aanwezig, mount blijft"
    exit 0
fi

logger -t dashcam-transfer "Remove: device $src verdwenen — transfer stoppen, mount opruimen"
systemctl stop dashcam-transfer.service 2>/dev/null || true
sleep 1
if ! umount /mnt/sdcard 2>/dev/null; then
    logger -t dashcam-transfer "Remove: umount mislukt, lazy unmount"
    umount -l /mnt/sdcard 2>/dev/null || true
fi
logger -t dashcam-transfer "Remove: stale mount opgeruimd"