t411 mass replace tracker

tracker-replace.sh

#!/usr/bin/env bash

set -e
# set -x

# t411 key
t411_key="******"

transmission_host="localhost:9091" # Transmission daemon host
transmission_username=""
transmission_password=""

if [[ -n "${transmission_username}" ]]; then
  transmission_opts="${transmission_host} --auth ${transmission_username}:${transmission_password}"
else
  transmission_opts="${transmission_host}"
fi

# Tracker to replace
old_tracker="t411.download"
# New tracker URL
new_tracker="http://hostname:port"

# Get all torrent IDs
torrent_ids=$(transmission-remote ${transmission_opts} --list | awk '{print $1}' | grep -E '^[0-9]+' | sed -r -e 's/^([0-9]*).*$/\1/')
max_torrent_id=$(echo "$torrent_ids" | tail -n1)

for id in ${torrent_ids}; do
  echo "Torrent $id / $max_torrent_id"
  # Get all trackers of the current torrent
  trackers=$(transmission-remote ${transmission_opts} --torrent ${id} --info-trackers | grep -E 'Tracker [0-9]+')
  # Is there the tracker to replace?
  echo "${trackers}" | grep ${old_tracker} > /dev/null && rc=$? || rc=$?
  if [[ $rc -ne 0 ]]; then
    echo "No old tracker \"$old_tracker\" on torrent $id" >&2
    continue
  fi

  tracker_id=$(echo "${trackers}" | grep ${old_tracker} | sed -r -e 's/Tracker ([0-9]+).*/\1/')
  transmission-remote ${transmission_opts} --torrent ${id} --tracker-remove ${tracker_id} > /dev/null
  transmission-remote ${transmission_opts} --torrent ${id} --tracker-add "${new_tracker}/${t411_key}/announce" > /dev/null
  echo "Replaced tracker \"$old_tracker\" with \"$new_tracker\""
done