#!/bin/bash
# Mount SD card by kernel device name (udev %k) and start dashcam transfer.
# Called by udev rule 99-dashcam-trigger.rules via systemd-run.
# systemd-run is used (not direct udev exec) because udev context
# lacks mount/umount permissions on Fedora with SELinux enforcing.
MAX_WAIT="${DASHCAM_MAX_WAIT:-60}"

DEV=${1:+/dev/$1}
logger -t dashcam-transfer "Trigger: SD card detected ($DEV)"

# Never interrupt a running transfer: a flaky reader can cause a second
# udev event (USB re-enumeration) which must not unmount a busy card.
if systemctl is-active --quiet dashcam-transfer.service; then
    logger -t dashcam-transfer "Trigger: transfer service al bezig — skip"
    exit 0
fi

if [ -n "$1" ]; then
    for ((i=0; i<MAX_WAIT; i++)); do
        if [ -e "$DEV" ]; then
            logger -t dashcam-transfer "Trigger: device ready after ${i}s"
            break
        fi
        sleep 1
    done
else
    UUID=$(lsblk -rno UUID /dev/sde1 2>/dev/null)
    DEV=/dev/disk/by-uuid/$UUID
    for ((i=0; i<MAX_WAIT; i++)); do
        if [ -e "$DEV" ]; then
            logger -t dashcam-transfer "Trigger: device ready after ${i}s"
            break
        fi
        sleep 1
    done
fi

while mountpoint -q /mnt/sdcard 2>/dev/null; do
    umount /mnt/sdcard 2>/dev/null || break
done

mount "$DEV" /mnt/sdcard -o uid=1000,gid=1000,fmask=0000,dmask=0000
if [ $? -eq 0 ]; then
    logger -t dashcam-transfer "Trigger: mounted, starting transfer"
    # Read-only exFAT health check; logs warnings but never blocks the transfer.
    if command -v fsck.exfat >/dev/null 2>&1; then
        fsck.exfat -n "$DEV" 2>&1 | logger -t dashcam-transfer
        logger -t dashcam-transfer "Trigger: fsck.exfat exit ${PIPESTATUS[0]}"
    fi
    systemctl start dashcam-transfer
else
    logger -t dashcam-transfer "TRIGGER ERROR: mount failed"
fi