Edgewall Software

Version 58 (modified by Remy Blank, 15 years ago) ( diff )

Added a comment about removing previous versions of the Trac egg

This page documents the 1.4 (latest stable) release. Documentation for other releases can be found here.

Upgrade Instructions

A Trac environment needs to be upgraded before it can be used with Trac 0.11. This document describes the steps necessary to upgrade an environment.

Environment upgrades are not necessary for minor version releases unless otherwise noted.


Typically, there are four steps involved in upgrading to a newer version of Trac:

Update the Trac Code

Get the new version as described in TracInstall, or your operating system specific procedure.

If you do a manual (not operating system specific) upgrade, you may also later on want to remove the existing Trac code by deleting the trac directory from the Python lib/site-packages directory. If you installed with an egg, make sure to remove all previous versions (#7625).

The 'may' part here is a little disconcerting. When should the old code be deleted and when shouldn't it? Should it be deleted before or after installing the new version? Is it different for minor upgrades?

The location of the site-packages directory depends on the operating system, and the location in which Python was installed. However, the following locations are common:

  • If you’re using Linux: /usr/lib/python2.X/site-packages
  • If you’re using Windows: C:\Python2.X\lib\site-packages
  • If you’re using MacOSX: /Library/Python2.X/site-packages

You may also want to remove the Trac cgi-bin, htdocs, templates and wiki-default directories that are commonly found in a directory called share/trac (the exact location depends on your platform).

If you had the webadmin plugin installed, you can now uninstall it as it is now part of the Trac code base.

Upgrade the Trac Environment

After restarting, Trac should show the instances which need a manual upgrade via the automated upgrade scripts to ease the pain. These scripts are run via trac-admin:

trac-admin /path/to/projenv upgrade

This command will do nothing if the environment is already up-to-date.

Note that if you are using a PostgreSQL database, this command will fail with the message that the environment can only be backed up when you use an SQLite database. This means that you will have to backup the repository and the database manually. Then, to perform the actual upgrade, run:

trac-admin /path/to/projenv upgrade --no-backup

If you are using custom CSS styles or modified templates in the templates directory of the TracEnvironment, you will need to convert them to the Genshi way of doing things. To continue to use your style sheet, follow the instructions at TracInterfaceCustomization#SiteAppearance.

Update the Trac Documentation

Every Trac environment includes a copy of the Trac documentation for the installed version. As you probably want to keep the included documentation in sync with the installed version of Trac, trac-admin provides a command to upgrade the documentation:

trac-admin /path/to/projenv wiki upgrade

Note that this procedure will of course leave your WikiStart page intact.

Site Templates

The templating engine has changed in 0.11, please look at TracInterfaceCustomization for more information.

Trac Macros, Plugins

The Trac macros will need to be adapted, as the old-style wiki-macros are not supported anymore (due to the drop of ClearSilver and the HDF); they need to be converted to the new-style macros, see WikiMacros. When they are converted to the new style, they need to be placed into the plugins directory instead and not wiki-macros, which is no longer scanned for macros or plugins.

For CGI users

For those who run Trac under the CGI environment, run this command in order to obtain the trac.cgi file:

trac-admin /path/to/env deploy /deploy/directory/path

This will create a deploy directory with the following two subdirectories: cgi-bin and htdocs. Move those directories to your environment directory, and then update your Apache configuration file httpd.conf with this new trac.cgi location.

Restart the Web Server

If you are not running CGI, reload the new Trac code by restarting your web server.

Known Issues

parent dir

If you use a trac parent env configuration and one of the plugins in one child does not work, none of the children work.

some core modules won't load

This can happen in particular with Python 2.3 on Windows when upgrading without uninstalling first. Some modules were previously capitalized and were changed to lower case, e.g. trac/About.py became trac/about.py. You may find such messages in the Trac log:

ERROR: Skipping "trac.about = trac.about": (can't import "No module named about")

Remove the Lib/site-packages/trac folder and reinstall.

Wiki Upgrade

trac-admin will not delete or remove pages that were in version 0.10 but now are not in version 0.11, such as WikiMacros.

Changing Database Backend

SQLite to PostgreSQL

The sqlite2pg script on trac-hacks.org has been written to assist in migrating a SQLite database to a PostgreSQL database

Older Versions

For upgrades from versions older than Trac 0.10, refer first to trac:wiki:0.10/TracUpgrade.

Note that downgrading from Trac 0.11 to Trac 0.10.4 or 0.10.5 is easy, but has to be done manually, e.g.

$ sqlite3 db/trac.db "update system set value=20 where name='database_version'"

(upgrade can be redone the normal way later on)

See also: TracGuide, TracInstall

Note: See TracWiki for help on using the wiki.