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Upgrade Instructions

A Trac environment sometimes needs to be upgraded before it can be used with a new version of Trac. This document describes the steps necessary to upgrade an environment.

Note: Environment upgrades are not necessary for minor version releases unless otherwise noted. For example, there's no need to upgrade a Trac environment created with (or upgraded) 0.8.0 when installing 0.8.4 (or any other 0.8.x release).

General Instructions

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

Update the Trac Code

Get the new version of Trac, either by downloading an offical release package or by checking it out from the Subversion repository.

If you have a source distribution, you need to run

python install

to install the new version. If you've downloaded the Windows installer, you execute it, and so on.

In any case, if you're doing a major version upgrade (such as from 0.8 to 0.9), it is highly recommended that you first remove the existing Trac code. To do this, you need to delete the trac directory from the Python lib/site-packages directory. You may also want to remove the Trac cgi-bin, htdocs and templates directories that are commonly found in a directory called share/trac (the exact location depends on your platform).

Upgrade the Trac Environment

Unless noted otherwise, upgrading between major versions (such as 0.8 and 0.9) involves changes to the database schema, and possibly the layout of the environment directory. Fortunately, Trac provides 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.

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.

Restart the Web Server

In order to reload the new Trac code you will need to restart your web server (note this is not necessary for plain old CGI, although CGI is discouraged for performance reasons).

Specific Versions

The following sections discuss any extra actions that may need to be taken to upgrade to specific versions of Trac.

From 0.8.x to 0.9

If you're using CGI you will want to update your Alias to the Trac htdocs static resources. See the documentation on mapping static resources for an example on how to configure this.

FastCGI and mod_python users can safely remove any Aliases to the Trac htdocs folder since this is no longer used by default.

mod_python users will also need to change the name of the mod_python handler in the Apache HTTPD configuration:

   from: PythonHandler trac.ModPythonHandler
   to:   PythonHandler trac.web.modpython_frontend

If you have PySQLite 2.x installed, Trac will now try to open your SQLite database using the SQLite 3.x file format. The database formats used by SQLite 2.8.x and SQLite 3.x are incompatible. If you get an error like “file is encrypted or is not a database” after upgrading, then you must convert your database file.

To do this, you need to have both SQLite 2.8.x and SQLite 3.x installed (they have different filenames so can coexist on the same system). Then use the following commands:

 $ mv trac.db trac2.db
 $ sqlite trac2.db .dump | sqlite3 trac.db

After testing that the conversion was successful, the trac2.db file can be deleted. For more information on the SQLite upgrade see

From 0.7.x to 0.8

0.8 adds a new roadmap feature which requires additional permissions. While a fresh installation will by default grant ROADMAP_VIEW and MILESTONE_VIEW permissions to anonymous, these permissions have to be granted manually when upgrading:

 $ trac-admin /path/to/projectenv permission add anonymous MILESTONE_VIEW
 $ trac-admin /path/to/projectenv permission add anonymous ROADMAP_VIEW

See also: TracGuide, TracInstall