= Trac on Red Hat Enterprise Linux 4 =

== Installing Trac Software and Dependencies ==

Installing Trac On Red Hat Enterprise Linux 4 (or rebuilds like CentOS4 or ScientificLinux4) is easy with the RPMforge packages from Dag and Dries. If you are not familiar with using these packages, you probably want to read http://rpmforge.net/user/faq/ first. If you are using Red Hat's up2date, you will need to download the rpmforge-release at http://rpmforge.net/user/packages/rpmforge-release/ and add the following lines to your /etc/sysconfig/rhn/sources file:

{{{
# Name: RPMforge RPM Repository for Red Hat Enterprise 4 - i386
yum rpmforge http://apt.sw.be/redhat/el4/en/i386/dag/
}}}

SELinux note: Please read TracWithSeLinux if you're using SELinux on RHEL4. Basically the default SELinux configuration only allows Apache to read certain directories, so you may need to add trac to the Apache context (`man chcon`) or turn off SELinux (`man setenforce`). For more information on SELinux, see http://fedora.redhat.com/docs/selinux-faq/. To turn off SELinux edit the /etc/selinux/config file and set SELINUX=disabled 

1) After configuring up2date to use the RPMforge repository, run the following command in a terminal window:

{{{
  $ up2date -i trac
}}}

up2date will take care of all dependencies on which the Trac package depends (including clearsilver, guile, neon, perl-URI, python-clearsilver, python-sqlite, sqlite, and subversion packages) and will fetch and install them for you automatically. For a full list of what it requires, see the RPM spec file at http://dag.wieers.com/packages/trac/trac.spec 

== Configure Subversion ==

Before we can create a new trac environment we must first have a working subversion repository if we are going to get the full use out of trac. Create a subversion repository if you don't already have one, for example in ''/srv/svn'':

{{{
 $ sudo mkdir -p /srv/svn
 $ sudo svnadmin create  --fs-type fsfs /srv/svn
}}}

Next you need to decide where to store your trac project and create the directory, for example in the new directory /srv/trac:

{{{
 $ sudo mkdir -p  /srv/trac
}}}

Now make it owned by apache:

{{{
 $ sudo chown -R apache /srv/trac
 $ sudo chown -R apache /srv/svn
}}}

== Creating an Environment ==

A new Trac environment is created using [wiki:TracAdmin trac-admin]:
{{{
$ trac-admin /path/to/projectenv initenv
}}}

[wiki:TracAdmin trac-admin] will ask you for the name of the project, the database connection string (explained below), and the type and the path to your source code repository.

''Note: The web server user will require file system write permission to the environment directory and all the files inside. Please remember to set the appropriate permissions. The same applies to the Subversion repository Trac is eventually using, although Trac will only require read access as long as you're not using the BDB file system.''

=== Database Connection Strings ===

Since version 0.9, Trac supports both [http://sqlite.org/ SQLite] and [http://www.postgresql.org/ PostgreSQL] as database backends.  The default is to use SQLite, which is probably sufficient for most projects. The database file is then stored in the environment directory, and can easily be [wiki:TracBackup backed up] together with the rest of the environment.

The connection string for an embedded SQLite database is:
{{{
sqlite:db/trac.db
}}}

=== Source Code Repository ===

You'll first have to provide the ''type'' of your repository (e.g. `svn` for Subversion, which is the default), then the ''path'' where the repository is located.

If you don't want to use Trac with a source code repository, simply leave the ''path'' empty (the ''type'' information doesn't matter, then).

For some systems, it is possible to specify not only the path to the repository, but also a ''scope'' within the repository. Trac will then only show information related to the files and changesets below that scope. The Subversion backend for Trac supports this; for other types, check the corresponding plugin's documentation.

Example of a configuration for a Subversion repository:
{{{
[trac]
repository_type = svn
repository_dir = /path/to/your/repository
}}}

The configuration for a scoped Subversion repository would be:
{{{
[trac]
repository_type = svn
repository_dir = /path/to/your/repository/scope/within/repos
}}}

== Directory Structure ==

An environment directory will usually consist of the following files and directories:

 * `README` - Brief description of the environment.
 * `VERSION` - Contains the environment version identifier.
 * `attachments` - Attachments to wiki pages and tickets are stored here.
 * `conf`
   * `trac.ini` - Main configuration file. See TracIni.
 * `db`
   * `trac.db` - The SQLite database (if you're using SQLite).
 * `plugins` - Environment-specific [wiki:TracPlugins plugins] (Python eggs)
 * `templates` - Custom environment-specific templates.
   * `site_css.cs` - Custom CSS rules.
   * `site_footer.cs` - Custom page footer.
   * `site_header.cs` - Custom page header.
 * `wiki-macros` - Environment-specific [wiki:WikiMacros Wiki macros].

  '''Note: don't confuse a Trac environment directory with the Source Code Repository directory. It happens that the above structure is loosely modelled after the Subversion repository directory structure, but they are not and ''must not'' be located at the same place.'''

3) Next, you need to edit the file ''/etc/httpd/conf.d/trac.conf'' to point to your new project
environment, as in this example (using mod_python):

{{{
 <Location /foobar>
   SetHandler mod_python
   PythonHandler trac.web.modpython_frontend
   PythonOption TracEnv /srv/trac/foobar
   PythonOption TracUriRoot /foobar
 </Location>
 <Location "/foobar/login">
   AuthType Basic
   AuthName "trac"
   AuthUserFile /src/trac/trac.htpasswd
   Require valid-user
 </Location>
}}}

The example above assumes you have a trac project environment setup in ''/srv/trac/foobar/'' directory, described in step 2 and a htpasswd file in /src/trac/trac.htpasswd for authentication purposes (see also wiki:TracModPython). 

You will need to restart apache after editing trac.conf:

{{{
  $ sudo service httpd restart
}}}

Verify your Trac installation by pointing your browser at the correct URL for your Trac server.

If you're installing any trac plugins, keep in mind that RHEL4 ships with Python 2.3. You can also find a python-setuptools rpm at http://install.linux.ncsu.edu/pub/yum/CLS/CLSTools.EL4/repodata/index.html

Be sure to check out the generic installation instructions in the [wiki:TracGuide TracGuide]