pull-from-seedbox

#!/bin/bash
# shellcheck disable=SC2088,SC2029
#
# This script can be added to crontab (see cron-wrapper) to automatically pull
# completed downloads off a seedbox as soon as they're finished. Unlike various
# sync solutions, it's a simple one-way move, so you can have it drop files in
# your regular Downloads instead of needing a dedicated sync folder.
#
# In ruTorrent, make sure AutoMove is enabled and set to "Hard link" and the
# REMOTE_DIR below. Torrents will continue seeding until removed either manually
# or by a ratio group (e.g. 200%/0/0/720h/Remove data). AutoWatch can be set to
# the same path (you could add a second rclone to send torrent files up to the
# box; I use WinSCP's right click > Send To > Seedbox instead). Note: you may
# wish to reduce the watch interval in rutorrent/plugins/autotools/conf.php.
#
# Install rclone (https://rclone.org/downloads/) and run `rclone config` to set
# the remote's login credentials.
#
set -e

REMOTE_NAME='seedbox'
REMOTE_DIR='downloads/sync'
LOCAL_DIR='/mnt/c/Users/max/Downloads'

run_rclone() {
  # Run rclone, but hold off on logging anything unless it failed
  if ! output=$(
    rclone move \
      --no-traverse \
      --log-format '' \
      --log-level DEBUG \
      --ignore-existing \
      --exclude '*.torrent' \
      --delete-empty-src-dirs \
      --low-level-retries 3 \
      "$REMOTE_NAME:$REMOTE_DIR" "$LOCAL_DIR" 2>&1
  ); then
    echo "$output"
    return 1
  fi
}

# Exponential backoff in case of intermittent connection errors
backoff=2
backoff_factor=2
attempts_left=4
while (( attempts_left-- > 0 )); do
  if run_rclone; then
    break
  elif (( attempts_left == 0 )) || [[ $output == *unable\ to\ authenticate* ]]; then
    # cron-wrapper will disable the cronjob and trigger a notification
    exit 1
  fi
  printf 'rclone failed, retrying in %s min (%s attempts left)\n' "$backoff" "$attempts_left"
  sleep "${backoff}m"
  (( backoff *= backoff_factor ))
done

# Exit silently if nothing was copied to avoid filling up logs
if grep -q 'There was nothing to transfer' <<<"$output"; then
  exit
fi
echo "$output"

# Grep out the names of the top-level items that were copied
list=$(grep -oP '(?<=INFO  : )[^/]*(?=.*: (Multi-thread )?Copied)' <<<"$output" | sort -u)
readarray -t items <<<"$list"
count=${#items[@]}
if (( count == 0 )); then
  exit
fi

# Show a notification
# Note: --appId is specific to wsl-notify-send
title="$count item"
if (( count > 1 )); then
  title+='s'
fi
title+=' transferred'
description=$(basename -a "${items[@]}")

box() {
  local width=$1
  printf "┌%$((width - 2))s┐\n" | sed 's/ /─/g'
  fold -w $((width - 4)) | xargs -d $'\n' printf "│ %-$((width - 4))s │\n"
  printf "└%$((width - 2))s┘\n" | sed 's/ /─/g'
}

printf '%s\n\n%s\n' "$title" "$description" | box 75 | sed 's/^/ /'

notify-send \
  --appId "$(basename "${BASH_SOURCE[0]}" | title-case)" \
  --category "$title" \
  "$description"