feat: add dashcam-transfer.py script
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Eddy de Vink
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# Dashcam Transfer Implementation Plan
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> **For agentic workers:** REQUIRED SUB-SKILL: Use superpowers:subagent-driven-development (recommended) or superpowers:executing-plans to implement this plan task-by-task. Steps use checkbox (`- [ ]`) syntax for tracking.
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**Goal:** Automatic transfer of dashcam MP4 files from SD card to USB-SSD.
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**Architecture:** Single Python script (`dashcam-transfer.py`) using stdlib only, triggered by udev rule via systemd oneshot service.
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**Tech Stack:** Python 3 (stdlib), systemd, udev
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---
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### Task 1: Write dashcam-transfer.py
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**Files:**
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- Create: `dashcam-transfer.py` (local repo)
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- Deploy to: `/usr/local/bin/dashcam-transfer` on nextcloud
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The script must:
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1. Parse all `.MP4` files from `/mnt/sdcard/Novatek/Movie/`
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2. Extract date (first 8 chars of filename) → `YYYYMMDD/` dir
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3. Extract camera suffix (last char before `.MP4`):
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- `F` → `front/`
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- `B` → `back/`
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4. Create target dirs: `/mnt/ultratouch/dashcam/YYYYMMDD/{front,back}/`
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5. Calculate total space needed, check available space
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6. If insufficient: sort date dirs on ultratouch by name, delete oldest dirs until enough space
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7. `mv` each file (not copy)
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8. Log every action to `/var/log/dashcam-transfer.log`
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9. Use `flock` lockfile to prevent concurrent runs
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10. Error handling: skip unreadable files, abort if SD not mounted
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- [ ] **Write dashcam-transfer.py**
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```python
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#!/usr/bin/env python3
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"""Transfer dashcam MP4 files from SD card to USB-SSD with date/camera structure."""
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import fcntl
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import logging
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import os
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import re
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import shutil
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import sys
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# Config
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SD_CARD = "/mnt/sdcard"
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SOURCE_DIR = os.path.join(SD_CARD, "Novatek", "Movie")
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SSD = "/mnt/ultratouch"
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TARGET_BASE = os.path.join(SSD, "dashcam")
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LOG_FILE = "/var/log/dashcam-transfer.log"
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LOCK_FILE = "/var/run/dashcam-transfer.lock"
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CAMERA_MAP = {"F": "front", "B": "back"}
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FILE_PATTERN = re.compile(r"^(\d{8})\d{6}_\d+([FB])\.MP4$")
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logging.basicConfig(
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filename=LOG_FILE,
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level=logging.INFO,
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format="[%(asctime)s] %(levelname)s %(message)s",
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datefmt="%Y-%m-%d %H:%M:%S",
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)
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def acquire_lock():
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lock_fd = open(LOCK_FILE, "w")
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try:
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fcntl.flock(lock_fd, fcntl.LOCK_EX | fcntl.LOCK_NB)
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except IOError:
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logging.warning("Lockfile actief — script al bezig")
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sys.exit(1)
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return lock_fd
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def check_mount(path, name):
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if not os.path.ismount(path):
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logging.error("%s niet gemount: %s", name, path)
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sys.exit(1)
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def get_mp4_files(src_dir):
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if not os.path.isdir(src_dir):
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logging.info("Geen bronmap: %s", src_dir)
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return []
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files = []
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for fname in os.listdir(src_dir):
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match = FILE_PATTERN.match(fname)
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if match:
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files.append((fname, match.group(1), match.group(2).upper()))
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return files
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def ensure_free_space(needed_bytes, target_base):
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stat = os.statvfs(target_base)
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free = stat.f_frsize * stat.f_bavail
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if free >= needed_bytes:
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return
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logging.info("Onvoldoende ruimte: %d nodig, %d vrij", needed_bytes, free)
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date_dirs = sorted(
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d for d in os.listdir(target_base)
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if re.match(r"^\d{8}$", d) and os.path.isdir(os.path.join(target_base, d))
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)
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freed = 0
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removed = []
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for d in date_dirs:
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if free + freed >= needed_bytes:
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break
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dir_path = os.path.join(target_base, d)
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dir_size = sum(
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os.path.getsize(os.path.join(dirpath, f))
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for dirpath, _, filenames in os.walk(dir_path)
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for f in filenames
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)
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shutil.rmtree(dir_path)
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freed += dir_size
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removed.append(d)
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logging.info("Verwijderd (ruimte gebrek): %s (%d bytes)", d, dir_size)
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if free + freed < needed_bytes:
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logging.error(
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"Nog steeds onvoldoende ruimte na verwijderen %d mappen", len(removed)
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)
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sys.exit(1)
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logging.info("Ruimte vrijgemaakt: %d bytes door %d mappen", freed, len(removed))
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def main():
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lock_fd = acquire_lock()
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check_mount(SD_CARD, "SD-kaart")
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check_mount(SSD, "Ultratouch SSD")
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files = get_mp4_files(SOURCE_DIR)
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if not files:
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logging.info("Geen MP4 bestanden gevonden in %s", SOURCE_DIR)
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return
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total_size = sum(
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os.path.getsize(os.path.join(SOURCE_DIR, fname)) for fname, _, _ in files
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)
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logging.info(
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"Start transfer: %d bestanden, %d bytes", len(files), total_size
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)
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ensure_free_space(total_size, TARGET_BASE)
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ok = 0
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errors = 0
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for fname, date_str, cam in files:
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target_dir = os.path.join(TARGET_BASE, date_str, CAMERA_MAP[cam])
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os.makedirs(target_dir, exist_ok=True)
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src = os.path.join(SOURCE_DIR, fname)
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dst = os.path.join(target_dir, fname)
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try:
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shutil.move(src, dst)
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logging.info("Verplaatst: %s → %s/%s/", fname, date_str, CAMERA_MAP[cam])
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ok += 1
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except OSError as e:
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logging.error("Fout bij %s: %s", fname, e)
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errors += 1
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logging.info(
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"Transfer voltooid: %d ok, %d fouten, %d bytes", ok, errors, total_size
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)
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if __name__ == "__main__":
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main()
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```
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- [ ] **Commit to repo**
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```bash
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git add dashcam-transfer.py
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git commit -m "feat: dashcam-transfer.py script"
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git push
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```
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---
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### Task 2: Deploy and test on nextcloud
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**Files:**
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- Modify: `/usr/local/bin/dashcam-transfer` on nextcloud
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- [ ] **Copy script to nextcloud**
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```bash
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scp dashcam-transfer.py aiaiaiaiagent@nextcloud:/tmp/
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ssh aiaiaiaiagent@nextcloud 'sudo -A install -m 755 /tmp/dashcam-transfer.py /usr/local/bin/dashcam-transfer'
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```
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- [ ] **Dry-run test (check detection, no transfer yet)**
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```bash
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ssh aiaiaiaiagent@nextcloud '/usr/local/bin/dashcam-transfer'
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```
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Expected: Script should find 338 MP4 files, log the start, and proceed with transfer.
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---
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### Task 3: Add udev rule + systemd service (if needed)
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**Files:**
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- Create: `/etc/udev/rules.d/99-dashcam-sdcard.rules` on nextcloud
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- Create: `/etc/systemd/system/dashcam-transfer.service` on nextcloud
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- Create: `dashcam-transfer-trigger` script on nextcloud
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- [ ] **Create trigger script**
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```bash
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ssh aiaiaiaiagent@nextcloud 'sudo tee /usr/local/bin/dashcam-transfer-trigger << "TRIGGER"
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#!/bin/bash
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sleep 5
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/usr/local/bin/dashcam-transfer
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TRIGGER'
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ssh aiaiaiaiagent@nextcloud 'sudo -A chmod +x /usr/local/bin/dashcam-transfer-trigger'
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```
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- [ ] **Create systemd service**
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```ini
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[Unit]
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Description=Dashcam SD card transfer
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After=mnt-sdcard.mount
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[Service]
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Type=oneshot
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ExecStart=/usr/local/bin/dashcam-transfer
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```
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- [ ] **Create udev rule**
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```udev
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ACTION=="add", KERNEL=="sdd1", RUN+="/usr/local/bin/dashcam-transfer-trigger"
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```
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