Add support for ticket dependencies to Trac


What is it?

This plugin adds "blocks" and "blocked by" fields to each ticket, enabling you to express dependencies between tickets. It also provides a graphviz-based dependency-graph feature for those tickets having dependencies specified, allowing you to visually understand the dependency tree. The dependency graph is viewable by clicking 'depgraph' in the context (in the upper right corner) menu when viewing a ticket that blocks or is blocked by another ticket.

This plugin works on Trac 1.0+. The plugin also works on Trac 0.11 and 0.12, but is no longer maintained.

Shows "Depgraph" link on ticket (#62). This ticket has dependencies shown grafically.

Shown in the image above is the following:

  1. "Depgraph" link at ticket #62 on middle top, yellow bullet.
  2. Blocks and blocked by extra fields at ticket #62.
  3. Graphical representation and deeper relation to other tickets on the right.
  4. Ticket statuses explanation in the lower left corner.

What is it not?

  • It does not provide ticket-hiding for sub-tasks of a top-level ticket.
    • There is no parent/child relationship possible, though this is now on the roadmap for an upcoming release, see #10964.
    • You cannot view the descriptions of tickets depending on the current ticket.
    • In fact, there are no explicit features that can assist you with sub-task management.
  • It does not allow you to create a dependent ticket from the current ticket.
  • It does not include reporting features to show how tasks are interrelated, other than the dependency graph already described above.

Just put the ticket numbers that a given ticket is blocking in the Blocking field. Enter just the number, no leading #. Separate multiple numbers with commas.

Make sure you add the custom fields as shown below.

To use the dependency graphs you need to install Graphviz (released under Common Public License), and which can be installed from PyPi. You do not need the GraphvizPlugin or anything else beyond the dot binary.

See also DepgraphSidebarPlugin, TracTicketDepgraphPlugin.

Bugs/Feature Requests

Existing bugs and feature requests for MasterTicketsPlugin are here.

If you have any issues, create a new ticket.


125 / 138


21 / 42


5 / 5


Download the latest revision from here.

The plugin is also available on PyPi.


You can check out MasterTicketsPlugin from here using Subversion, or browse the source with Trac.


The easiest way to install this plugin is by using pip install:

$ pip install svn+


To enable, add the following to your trac.ini file:

mastertickets.* = enabled

To configure the plugin to use a graphviz/dot installation that is at another location, add the following to your trac.ini file:

dot_path = /opt/local/bin/dot

The documentation for other configuration options can be reviewed in the [mastertickets] section of TracIni.

Upgrade your installation

After installing or enabling this plugin, a new table is added to the database and Trac will need to be upgraded. Therefore run the following:

$ trac-admin /path/to/env upgrade

Recent Changes

17852 by rjollos on 2020-08-20 18:33:38
TracMasterTickets 4.0.5dev: Fix depgraph with summary containing quotes

Fixes #13854.

17800 by rjollos on 2020-07-16 22:37:28
TracMasterTickets 4.0.5dev: Fix incorrect change log entries

The entries in the referenced tickets' ticket_change
table lacked the proper cnum entries.

Refs #13848.

17757 by rjollos on 2020-05-18 22:59:30
TracMasterTickets 4.0.5dev: Wrap summary and improve tooltip

Fixes #11283.



Author: coderanger
Maintainer: Ryan J Ollos
Contributors: mitar

Last modified 2 years ago Last modified on Mar 25, 2022, 8:38:35 AM