transmission/docs/Scripts.md

Transmission scripts

Introduction

Thanks to the powerful RPC, transmission-remote can talk to any client that has the RPC enabled. This means that a script written using transmission-remote or RPC can, without rewrite, communicate with all the Transmission clients: Mac, Linux, Windows, and headless.

Mac OS users may wonder whether there will be AppleScript scripts, the answer is ''no''. Although AppleScript is a nice technology, it's a pain to implement. However, macOS is a Unix after all, so any script you find here will also work on the Mac. Even from within AppleScript, you can run these scripts by typing: do shell script "path/to/script".

How-To

If you are interested at writing scripts for Transmission, have a look at the following pages:

• [wiki:man Transmission man pages]
• [wiki:ConfigFiles Configuration Files]
• [wiki:EditConfigFiles Editing Configuration Files]
• [wiki:EnvironmentVariables Environment Variables]
• [wiki:rpc RPC Protocol Specification]

For those who need more information how to use the scripts, have a look at the following links:

• [https://help.ubuntu.com/community/CronHowto Cron How-To]: Run scripts at a regular interval

Scripts

Start/Stop

• [wiki:Scripts/initd init.d script] (Debian, Ubuntu and BSD derivatives)
• [wiki:Scripts/runscript runscript] (Gentoo and other runscript-compatible systems)

On torrent completion

Transmission can be set to invoke a script when downloads complete. The environment variables supported are:

• TR_APP_VERSION - Transmission's short version string, e.g. 4.0.0
• TR_TIME_LOCALTIME
• TR_TORRENT_BYTES_DOWNLOADED - Number of bytes that were downloaded for this torrent
• TR_TORRENT_DIR - Location of the downloaded data
• TR_TORRENT_HASH - The torrent's info hash
• TR_TORRENT_ID
• TR_TORRENT_LABELS - A comma-delimited list of the torrent's labels
• TR_TORRENT_NAME
• TR_TORRENT_TRACKERS - A comma-delimited list of the torrent's trackers' announce URLs

[https://trac.transmissionbt.com/browser/trunk/extras/send-email-when-torrent-done.sh Here is an example script] that sends an email when a torrent finishes.

Obsolete

Functionality of these scripts has been implemented in libtransmission and is thus available in all clients.

• [wiki:Scripts/EmailNotifier Email Notification Script]
• [wiki:Scripts/BlockListUpdater Block List Updater]
• [wiki:Scripts/Watchdog Watch Directory Script]
• [wiki:Scripts/Scheduler Bandwidth Scheduler]

contrib/scripts

Tomas Carnecky (aka wereHamster) is maintaining a set of scripts in his [https://github.com/wereHamster/transmission/tree/master/contrib/scripts/ GitHub repository].

Falk Husemann (aka hxgn) is maintaining scripts in his [https://falkhusemann.de/category/tcp_ip/transmission-tcp_ip/ blog].

Oguz wrote [https://oguzarduc.blogspot.com/2012/05/transmission-quit-script-in-php.html on his blog] a PHP script to stop Transmission after it finishes downloading and seeding. Scripts which have not yet been ported and may not work with the latest version:

• https://pastebin.com/QzVxQDtM: Bash - (cron)script to keep a maximum number of torrents running; starting and pausing torrents as necessary
• https://github.com/jaboto/Transmission-script - (cron)script set network limits according to the number of clients in the network

Security with systemd

transmission-daemon's packaging has many permissions disabled as a standard safety measure. If your script needs more permissions than are provided by the default, users have reported that it can be resolved by changing to NoNewPrivileges=false in /lib/systemd/system/transmission-daemon.service.