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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 that 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:

1. 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 setup.py 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).

2. 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. 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.

3. 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.

4. 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).


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 the TracCgi wiki page for an
example on how to configure this. 

FastCGI and mod_python users can safely remove any `Alias`es 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
http://www.sqlite.org/version3.html.


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


From 0.6.x to 0.7
-----------------
Trac 0.7 introduced a new database format, requiring manual upgrade.

Previous versions of Trac stored wiki pages, ticket, reports, settings,
etc. in a single SQLite database file. Trac 0.7 replaces this file
with a new backend storage format; the 'Trac Environment', which is a
directory containing an SQLite database, a human-readable configuration file,
log-files and attachments.

Fear not though, old-style Trac databases can easily be converted to
Environments using the included `tracdb2env` program as follows:

   tracdb2env /path/to/old/project.db /path/to/new/projectenv

`tracdb2env` will create a new environment and copy the information from the
old database to the new environment. The existing database will not be
modified.

You also need to update your apache configuration:

Change the line:

   SetEnv TRAC_DB "/path/to/old/project.db"

to:

   SetEnv TRAC_ENV "/path/to/new/projectenv"


----

If you have trouble upgrading Trac, please ask questions on the mailing list:

  <http://projects.edgewall.com/trac/wiki/MailingList>

Or for other support options, see:

  <http://projects.edgewall.com/trac/wiki/TracSupport>