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Changes between Version 4 and Version 5 of Trac Install

Timestamp:: Apr 12, 2015, 9:30:13 PM (10 years ago)
Author:: trac
Comment:: --

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Trac Install

-                      v4
+                      v5
 = Trac Installation Guide for 1.0 =
+= Trac Installation Guide for 1.0
 [[TracGuideToc]]
 …
 Since version 0.12, Trac can also be localized, and there is probably a translation available in your language. If you want to use the Trac interface in other languages, then make sure you have installed the optional package [#OtherPythonPackages Babel]. Pay attention to the extra steps for localization support in the [#InstallingTrac Installing Trac] section below. Lacking Babel, you will only get the default English version.
 If you're interested in contributing new translations for other languages or enhance the existing translations, then please have a look at [trac:wiki:TracL10N TracL10N].
 What follows are generic instructions for installing and setting up Trac. While you may find instructions for installing Trac on specific systems at [trac:TracInstallPlatforms TracInstallPlatforms] on the main Trac site, please '''first read through these general instructions''' to get a good understanding of the tasks involved.
+If you're interested in contributing new translations for other languages or enhancing the existing translations, then please have a look at [trac:wiki:TracL10N TracL10N].
+What follows are generic instructions for installing and setting up Trac. While you may find instructions for installing Trac on specific systems at [trac:TracInstallPlatforms TracInstallPlatforms], please '''first read through these general instructions''' to get a good understanding of the tasks involved.
 [[PageOutline(2-3,Installation Steps,inline)]]
 == Dependencies ==
+== Dependencies
 === Mandatory Dependencies
 To install Trac, the following software packages must be installed:
  * [http://www.python.org/ Python], version >= 2.5 and < 3.0
    (note that we dropped the support for Python 2.4 in this release)
  * [http://peak.telecommunity.com/DevCenter/setuptools setuptools], version >= 0.6
+ * [http://www.python.org/ Python], version >= 2.6 and < 3.0
+   (note that we dropped the support for Python 2.5 in this release)
+ * [http://pypi.python.org/pypi/setuptools setuptools], version >= 0.6
  * [http://genshi.edgewall.org/wiki/Download Genshi], version >= 0.6
 …
 ==== For the SQLite database #ForSQLite
+As you must be using Python 2.5, 2.6 or 2.7, you already have the SQLite database bindings bundled with the standard distribution of Python: the `sqlite3` module.
+However, if you like, you can download the latest and greatest version of [[trac:PySqlite]] from
+[http://code.google.com/p/pysqlite/downloads/list google code], where you'll find the Windows
+installers or the `tar.gz` archive for building from source:
+{{{
+$ tar xvfz <version>.tar.gz
+$ cd <version>
+$ python setup.py build_static install
+}}}
+This will download the latest SQLite code and build the bindings. SQLite 2.x is no longer supported.
+A known bug in [trac:PySqlite] versions 2.5.2-4 prohibits upgrades of Trac databases from 0.11.x to 0.12. Please use versions 2.5.5 and newer or 2.5.1 and older. See #9434 for more detail. See additional information in [trac:PySqlite PySqlite].
+As you must be using Python 2.6 or 2.7, you already have the SQLite database bindings bundled with the standard distribution of Python (the `sqlite3` module).
+Optionally, you may install a newer version of [pypi:pysqlite pysqlite] than the one provided by the Python distribution. See [trac:PySqlite#ThePysqlite2bindings PySqlite] for details.
 ==== For the PostgreSQL database #ForPostgreSQL
 …
 === Optional Dependencies
+==== Version Control System ====
+===== Subversion =====
+ * [http://subversion.apache.org/ Subversion], 1.5.x or 1.6.x and the '''''corresponding''''' Python bindings. Older versions starting from 1.0, like 1.2.4, 1.3.2 or 1.4.2, etc. should still work. For troubleshooting information, check the [trac:TracSubversion#Troubleshooting TracSubversion] page.
+==== Subversion
+[http://subversion.apache.org/ Subversion], 1.6.x or later and the '''''corresponding''''' Python bindings.
 There are [http://subversion.apache.org/packages.html pre-compiled SWIG bindings] available for various platforms. (Good luck finding precompiled SWIG bindings for any Windows package at that listing. [trac:TracSubversion] points you to [http://alagazam.net Alagazam], which works for me under Python 2.6.)
+Note that Trac '''doesn't''' use [http://pysvn.tigris.org/ PySVN], neither does it work yet with the newer `ctype`-style bindings.
+'''Please note:''' if using Subversion, Trac must be installed on the '''same machine'''. Remote repositories are currently [trac:ticket:493 not supported].
+===== Others =====
+Support for other version control systems is provided via third-parties. See [trac:PluginList] and [trac:VersionControlSystem].
+==== Web Server ====
+A web server is optional because Trac is shipped with a server included, see the [#RunningtheStandaloneServer Running the Standalone Server ] section below.
+For troubleshooting information, see the [trac:TracSubversion#Troubleshooting TracSubversion] page.
+{{{#!div style="border: 1pt dotted; margin: 1em"
+**Note:**
+* Trac '''doesn't''' use [http://pysvn.tigris.org/ PySVN], nor does it work yet with the newer `ctype`-style bindings.
+* If using Subversion, Trac must be installed on the '''same machine'''. Remote repositories are currently [trac:ticket:493 not supported].
+}}}
+==== Git
+[http://git-scm.com/ Git] 1.5.6 or later is supported. More information is available on the [trac:TracGit] page.
+==== Other Version Control Systems
+Support for other version control systems is provided via third-party plugins. See [trac:PluginList#VersionControlSystems] and [trac:VersionControlSystem].
+==== Web Server
+A web server is optional because Trac is shipped with a server included, see the [#RunningtheStandaloneServer Running the Standalone Server] section below.
 Alternatively you can configure Trac to run in any of the following environments:
  * [http://httpd.apache.org/ Apache] with
    - [http://code.google.com/p/modwsgi/ mod_wsgi], see [wiki:TracModWSGI] and
      http://code.google.com/p/modwsgi/wiki/IntegrationWithTrac
    - [http://modpython.org/ mod_python 3.3.1], (deprecated: see TracModPython)
+   - [https://github.com/GrahamDumpleton/mod_wsgi mod_wsgi], see [wiki:TracModWSGI] and
+     [http://code.google.com/p/modwsgi/wiki/IntegrationWithTrac ModWSGI IntegrationWithTrac].
+   - [http://modpython.org/ mod_python 3.5.0], see TracModPython
  * a [http://www.fastcgi.com/ FastCGI]-capable web server (see TracFastCgi)
  * an [http://tomcat.apache.org/connectors-doc/ajp/ajpv13a.html AJP]-capable web
    server (see [trac:TracOnWindowsIisAjp TracOnWindowsIisAjp])
+ * Microsoft IIS with FastCGI and a FastCGI-to-WSGI gateway (see [trac:CookBook/Installation/TracOnWindowsIisWfastcgi IIS with FastCGI])
  * a CGI-capable web server (see TracCgi), '''but usage of Trac as a cgi script
    is highly discouraged''', better use one of the previous options.
 ==== Other Python Packages ====
  * [http://babel.edgewall.org Babel], version >= 0.9.5,
    needed for localization support (unreleased version 1.0dev should work as well)
+==== Other Python Packages
+ * [http://babel.edgewall.org Babel], version 0.9.6 or >= 1.3,
+   needed for localization support
  * [http://docutils.sourceforge.net/ docutils], version >= 0.3.9
    for WikiRestructuredText.
  * [http://pygments.org Pygments] for
+   [wiki:TracSyntaxColoring syntax highlighting].
+   [http://silvercity.sourceforge.net/ SilverCity] and/or
+   [http://gnu.org/software/enscript/enscript.html Enscript] may still be used
+   but are deprecated and you really should be using Pygments.
+   [TracSyntaxColoring syntax highlighting].
  * [http://pytz.sf.net pytz] to get a complete list of time zones,
    otherwise Trac will fall back on a shorter list from
    an internal time zone implementation.
+'''Attention''': The available versions of these dependencies are not necessarily interchangeable, so please pay attention to the version numbers. If you are having trouble getting Trac to work, please double-check all the dependencies before asking for help on the [trac:MailingList] or [trac:IrcChannel].
+Please refer to the documentation of these packages to find out how they are best installed. In addition, most of the [trac:TracInstallPlatforms platform-specific instructions] also describe the installation of the dependencies. Keep in mind however that the information there ''probably concern older versions of Trac than the one you're installing''. There are even some pages that are still talking about Trac 0.8!
+== Installing Trac ==
+{{{#!div style="border: 1pt dotted; margin: 1em"
+**Attention**: The available versions of these dependencies are not necessarily interchangeable, so please pay attention to the version numbers. If you are having trouble getting Trac to work, please double-check all the dependencies before asking for help on the [trac:MailingList] or [trac:IrcChannel].
+}}}
+Please refer to the documentation of these packages to find out how they are best installed. In addition, most of the [trac:TracInstallPlatforms platform-specific instructions] also describe the installation of the dependencies. Keep in mind however that the information there ''probably concern older versions of Trac than the one you're installing''.
+== Installing Trac
+The [TracAdmin trac-admin] command-line tool, used to create and maintain [TracEnvironment project environments], as well as the [TracStandalone tracd] standalone server are installed along with Trac. There are several methods for installing Trac.
 === Using `easy_install`
 One way to install Trac is using [http://pypi.python.org/pypi/setuptools setuptools]. With setuptools you can install Trac from the Subversion repository.
+Trac can be installed from PyPI or the Subversion repository using [http://pypi.python.org/pypi/setuptools setuptools].
 A few examples:
  - Install Trac 1.0:
    {{{
+   {{{#!sh
    easy_install Trac==1.0
    }}}
  - Install latest development version:
    {{{
+   {{{#!sh
    easy_install Trac==dev
    }}}
 …
    either use a released version or install from source
+More information can be found on the [trac:setuptools] page.
+{{{#!div style="border: 1pt dotted; margin: 1em"
+**Setuptools Warning:** If the version of your setuptools is in the range 5.4 through 5.6, the environment variable `PKG_RESOURCES_CACHE_ZIP_MANIFESTS` must be set in order to avoid significant performance degradation. More information may be found in the sections on [#RunningtheStandaloneServer Running The Standalone Server] and [#RunningTraconaWebServer Running Trac on a Web Server].
+}}}
 === Using `pip`
 'pip' is an easy_install replacement that is very useful to quickly install python packages.
 …
+ -
+{{{
+ {{{#!sh
 pip install trac psycopg2
 }}}
 or
+ -
+{{{
+ {{{#!sh
 pip install trac mysql-python
 }}}
 …
 Make sure your OS specific headers are available for pip to automatically build PostgreSQL (`libpq-dev`) or MySQL (`libmysqlclient-dev`) bindings.
 pip will automatically resolve all dependencies (like Genshi, pygments, etc.) and download the latest packages on pypi.python.org and create a self contained installation in `/opt/user/trac`.
+pip will automatically resolve all dependencies (like Genshi, pygments, etc.), download the latest packages from pypi.python.org and create a self contained installation in `/opt/user/trac`.
 All commands (`tracd`, `trac-admin`) are available in `/opt/user/trac/bin`. This can also be leveraged for `mod_python` (using `PythonHandler` directive) and `mod_wsgi` (using `WSGIDaemonProcess` directive)
 …
 === From source
 Of course, using the python-typical setup at the top of the source directory also works. You can obtain the source for a .tar.gz or .zip file corresponding to a release (e.g. `Trac-1.0.tar.gz`), or you can get the source directly from the repository. See [trac:SubversionRepository] for details.
 {{{
+Using the python-typical setup at the top of the source directory also works. You can obtain the source for a .tar.gz or .zip file corresponding to a release (e.g. `Trac-1.0.tar.gz`) from the [trac:TracDownload] page, or you can get the source directly from the repository. See [trac:TracRepositories#OfficialSubversionrepository TracRepositories] for details.
+{{{#!sh
 $ python ./setup.py install
 }}}
 …
 of your Python installation. The .egg will also contain all other resources needed by standard Trac, such as `htdocs` and `templates`.
-The script will also install the [wiki:TracAdmin trac-admin] command-line tool, used to create and maintain [wiki:TracEnvironment project environments], as well as the [wiki:TracStandalone tracd] standalone server.
 If you install from source and want to make Trac available in other languages, make sure Babel is installed. Only then, perform the `install` (or simply redo the `install` once again afterwards if you realize Babel was not yet installed):
 {{{
+{{{#!sh
 $ python ./setup.py install
 }}}
 Alternatively, you can run `bdist_egg` and copy the .egg from `dist/` to the place of your choice, or you can create a Windows installer (`bdist_wininst`).
+=== Advanced Options ===
+=== Using installer
+On Windows, Trac can be installed using the exe installers available on the [trac:TracDownload] page. Installers are available for the 32-bit and 64-bit versions of Python. Make sure to use the installer that matches the architecture of your Python installation.
+=== Using package manager
+Trac may be available in your platform's package repository. Note however, that the version provided by your package manager may not be the latest release.
+=== Advanced `easy_install` Options
 To install Trac to a custom location, or find out about other advanced installation options, run:
 {{{
+{{{#!sh
 easy_install --help
 }}}
 …
 Specifically, you might be interested in:
 {{{
+{{{#!sh
 easy_install --prefix=/path/to/installdir
 }}}
 or, if installing Trac on a Mac OS X system:
+{{{
+easy_install --prefix=/usr/local --install-dir=/Library/Python/2.5/site-packages
+}}}
+Note: If installing on Mac OS X 10.6 running {{{ easy_install http://svn.edgewall.org/repos/trac/trunk }}} will install into {{{ /usr/local }}} and {{{ /Library/Python/2.6/site-packages }}} by default.
+The above will place your `tracd` and `trac-admin` commands into `/usr/local/bin` and will install the Trac libraries and dependencies into `/Library/Python/2.5/site-packages`, which is Apple's preferred location for third-party Python application installations.
+== Creating a Project Environment ==
+A [TracEnvironment Trac environment] is the backend where Trac stores information like wiki pages, tickets, reports, settings, etc. An environment is basically a directory that contains a human-readable [TracIni configuration file], and other files and directories.
+A new environment is created using [wiki:TracAdmin trac-admin]:
+{{{
+{{{#!sh
+easy_install --prefix=/usr/local --install-dir=/Library/Python/2.6/site-packages
+}}}
+{{{#!div style="border: 1pt dotted; margin: 1em"
+**Mac OS X Note:** On Mac OS X 10.6,  running `easy_install trac` will install into `/usr/local` and `/Library/Python/2.6/site-packages` by default.
+The `tracd` and `trac-admin` commands will be placed in `/usr/local/bin` and will install the Trac libraries and dependencies into `/Library/Python/2.6/site-packages`, which is Apple's preferred location for third-party Python application installations.
+}}}
+== Creating a Project Environment
+A [TracEnvironment Trac environment] is the backend where Trac stores information like wiki pages, tickets, reports, settings, etc. An environment is a directory that contains a human-readable [TracIni configuration file], and other files and directories.
+A new environment is created using [TracAdmin trac-admin]:
+{{{#!sh
 $ trac-admin /path/to/myproject initenv
 }}}
+[TracAdmin trac-admin] will prompt you for the information it needs to create the environment, such as the name of the project and the [TracEnvironment#DatabaseConnectionStrings database connection string]. If you're not sure what to specify for one of these options, just press `<Enter>` to use the default value.
+Using the default database connection string in particular will always work as long as you have SQLite installed.
+For the other [DatabaseBackend database backends] you should plan ahead and already have a database ready to use at this point.
+Since 0.12, Trac doesn't ask for a [TracEnvironment#SourceCodeRepository source code repository] anymore when creating an environment. Repositories can be [TracRepositoryAdmin added] afterwards, and support for specific version control systems is disabled by default.
+Also note that the values you specify here can be changed later by directly editing the [TracIni conf/trac.ini] configuration file.
+When selecting the location of your environment, make sure that the filesystem on which the environment directory resides supports sub-second timestamps (i.e. **not** `ext2` or `ext3` on Linux), as the modification time of the `conf/trac.ini` file will be monitored to decide whether an environment restart is needed or not. A too coarse-grained timestamp resolution may result in inconsistencies in Trac < 1.0.2. The best advice is to opt for a platform with sub-second timestamp resolution, regardless of the Trac version.
+[TracAdmin trac-admin] will prompt you for the information it needs to create the environment: the name of the project and the [TracEnvironment#DatabaseConnectionStrings database connection string]. If you're not sure what to specify for any of these options, just press `<Enter>` to use the default value.
+Using the default database connection string will always work as long as you have SQLite installed. For the other [trac:DatabaseBackend database backends] you should plan ahead and already have a database ready to use at this point.
+Also note that the values you specify here can be changed later using TracAdmin or directly editing the [TracIni conf/trac.ini] configuration file.
+{{{#!div style="border: 1pt dotted; margin: 1em"
+**Filesystem Warning:** When selecting the location of your environment, make sure that the filesystem on which the environment directory resides supports sub-second timestamps (i.e. **not** `ext2` or `ext3` on Linux), as the modification time of the `conf/trac.ini` file will be monitored to decide whether an environment restart is needed or not. A too coarse-grained timestamp resolution may result in inconsistencies in Trac < 1.0.2. The best advice is to opt for a platform with sub-second timestamp resolution, regardless of the Trac version.
+}}}
 Finally, make sure the user account under which the web front-end runs will have '''write permissions''' to the environment directory and all the files inside. This will be the case if you run `trac-admin ... initenv` as this user. If not, you should set the correct user afterwards. For example on Linux, with the web server running as user `apache` and group `apache`, enter:
 {{{
 $ chown -R apache.apache /path/to/myproject
+{{{#!sh
+$ chown -R apache:apache /path/to/myproject
 }}}
 …
 == Deploying Trac
 === Running the Standalone Server ===
 After having created a Trac environment, you can easily try the web interface by running the standalone server [wiki:TracStandalone tracd]:
 {{{
+=== Running the Standalone Server
+After having created a Trac environment, you can easily try the web interface by running the standalone server [TracStandalone tracd]:
+{{{#!sh
 $ tracd --port 8000 /path/to/myproject
 }}}
 Then, fire up a browser and visit `http://localhost:8000/`. You should get a simple listing of all environments that `tracd` knows about. Follow the link to the environment you just created, and you should see Trac in action. If you only plan on managing a single project with Trac you can have the standalone server skip the environment list by starting it like this:
 {{{
+{{{#!sh
 $ tracd -s --port 8000 /path/to/myproject
 }}}
+=== Running Trac on a Web Server ===
+{{{#!div style="border: 1pt dotted; margin: 1em"
+**Setuptools Warning:** If the version of your setuptools is in the range 5.4 through 5.6, the environment variable `PKG_RESOURCES_CACHE_ZIP_MANIFESTS` must be set in order to avoid significant performance degradation. The environment variable can be set system-wide, or for just the user that runs the `tracd` process. There are several ways to accomplish this in addition to what is discussed here, and depending on the distribution of your OS.
+To be effective system-wide a shell script with the `export` statement may be added to `/etc/profile.d`. To be effective for a user session the `export` statement may be added to `~/.profile`.
+{{{#!sh
+export PKG_RESOURCES_CACHE_ZIP_MANIFESTS=1
+}}}
+Alternatively, the variable can be set in the shell before executing `tracd`:
+{{{#!sh
+$ PKG_RESOURCES_CACHE_ZIP_MANIFESTS=1 tracd --port 8000 /path/to/myproject
+}}}
+}}}
+=== Running Trac on a Web Server
 Trac provides various options for connecting to a "real" web server:
  - [wiki:TracFastCgi FastCGI]
+ - [TracFastCgi FastCGI]
  - [wiki:TracModWSGI mod_wsgi]
  - //[wiki:TracModPython mod_python] (no longer recommended, as mod_python is not actively maintained anymore)//
  - //[wiki:TracCgi CGI] (should not be used, as the performance is far from optimal)//
+ - [TracModPython mod_python]
+ - //[TracCgi CGI] (should not be used, as the performance is far from optimal)//
 Trac also supports [trac:TracOnWindowsIisAjp AJP] which may be your choice if you want to connect to IIS. Other deployment scenarios are possible: [trac:TracNginxRecipe nginx], [http://projects.unbit.it/uwsgi/wiki/Example#Traconapacheinasub-uri uwsgi], [trac:TracOnWindowsIisIsapi Isapi-wsgi] etc.
 ==== Generating the Trac cgi-bin directory ==== #cgi-bin
 In order for Trac to function properly with FastCGI you need to have a `trac.fcgi` file and for mod_wsgi a `trac.wsgi` file. These are Python scripts which load the appropriate Python code. They can be generated using the `deploy` option of [wiki:TracAdmin trac-admin].
 There is, however, a bit of a chicken-and-egg problem. The [wiki:TracAdmin trac-admin] command requires an existing environment to function, but complains if the deploy directory already exists. This is a problem, because environments are often stored in a subdirectory of the deploy. The solution is to do something like this:
 {{{
+==== Generating the Trac cgi-bin directory #cgi-bin
+In order for Trac to function properly with FastCGI you need to have a `trac.fcgi` file and for mod_wsgi a `trac.wsgi` file. These are Python scripts which load the appropriate Python code. They can be generated using the `deploy` option of [TracAdmin trac-admin].
+There is, however, a bit of a chicken-and-egg problem. The [TracAdmin trac-admin] command requires an existing environment to function, but complains if the deploy directory already exists. This is a problem, because environments are often stored in a subdirectory of the deploy. The solution is to do something like this:
+{{{#!sh
 mkdir -p /usr/share/trac/projects/my-project
 trac-admin /usr/share/trac/projects/my-project initenv
 …
 Don't forget to check that the web server has the execution right on scripts in the `/usr/share/trac/cgi-bin` directory.
 ==== Mapping Static Resources ====
+==== Mapping Static Resources
 Out of the box, Trac will pass static resources such as style sheets or images through itself. For anything but a tracd only based deployment, this is far from optimal as the web server could be set up to directly serve those static resources (for CGI setup, this is '''highly undesirable''' and will cause abysmal performance).
 …
 There are two primary URL paths for static resources - `/chrome/common` and `/chrome/site`. Plugins can add their own resources, usually accessible by `/chrome/<plugin>` path, so its important to override only known paths and not try to make universal `/chrome` alias for everything.
 Note that in order to get those static resources on the filesystem, you need first to extract the relevant resources from Trac using the [TracAdmin trac-admin]` <environment> deploy` command:
+Note that in order to get those static resources on the filesystem, you need first to extract the relevant resources from Trac using the TracAdmin `deploy` command:
 [[TracAdminHelp(deploy)]]
 …
  - `<plugins>/` - one directory for each resource directory managed by the plugins enabled for this environment
 ===== Example: Apache and `ScriptAlias` ===== #ScriptAlias-example
+===== Example: Apache and `ScriptAlias` #ScriptAlias-example
 Assuming the deployment has been done this way:
 {{{
+{{{#!sh
 $ trac-admin /var/trac/env deploy /path/to/shared/trac
 }}}
 Add the following snippet to Apache configuration ''before'' the `ScriptAlias` or `WSGIScriptAlias` (which map all the other requests to the Trac application), changing paths to match your deployment:
 {{{
+{{{#!apache
 Alias /trac/chrome/common /path/to/trac/htdocs/common
 Alias /trac/chrome/site /path/to/trac/htdocs/site
 …
 If using mod_python, you might want to add this too (otherwise, the alias will be ignored):
 {{{
+{{{#!apache
 <Location "/trac/chrome/common/">
   SetHandler None
 …
 }}}
 Note that we mapped `/trac` part of the URL to the `trac.*cgi` script, and the path `/trac/chrome/common` is the path you have to append to that location to intercept requests to the static resources.
+Note that we mapped the `/trac` part of the URL to the `trac.*cgi` script, and the path `/trac/chrome/common` is the path you have to append to that location to intercept requests to the static resources.
 Similarly, if you have static resources in a project's `htdocs` directory (which is referenced by `/trac/chrome/site` URL in themes), you can configure Apache to serve those resources (again, put this ''before'' the `ScriptAlias` or `WSGIScriptAlias` for the .*cgi scripts, and adjust names and locations to match your installation):
 {{{
+{{{#!apache
 Alias /trac/chrome/site /path/to/projectenv/htdocs
 …
 }}}
 Alternatively to aliasing `/trac/chrome/common`, you can tell Trac to generate direct links for those static resources (and only those), using the [[wiki:TracIni#trac-section| [trac] htdocs_location]] configuration setting:
 {{{
+Alternatively to aliasing `/trac/chrome/common`, you can tell Trac to generate direct links for those static resources (and only those), using the [[TracIni#trac-section| [trac] htdocs_location]] configuration setting:
+{{{#!ini
 [trac]
 htdocs_location = http://static.example.org/trac-common/
 …
 Of course, you still need to make the Trac `htdocs/common` directory available through the web server at the specified URL, for example by copying (or linking) the directory into the document root of the web server:
 {{{
+{{{#!sh
 $ ln -s /path/to/trac/htdocs/common /var/www/static.example.org/trac-common
 }}}
 ==== Setting up the Plugin Cache ====
+==== Setting up the Plugin Cache
 Some Python plugins need to be extracted to a cache directory. By default the cache resides in the home directory of the current user. When running Trac on a Web Server as a dedicated user (which is highly recommended) who has no home directory, this might prevent the plugins from starting. To override the cache location you can set the `PYTHON_EGG_CACHE` environment variable. Refer to your server documentation for detailed instructions on how to set environment variables.
 == Configuring Authentication ==
+== Configuring Authentication
 Trac uses HTTP authentication. You'll need to configure your webserver to request authentication when the `.../login` URL is hit (the virtual path of the "login" button). Trac will automatically pick the `REMOTE_USER` variable up after you provide your credentials. Therefore, all user management goes through your web server configuration. Please consult the documentation of your web server for more info.
 …
 Please refer to one of the following sections:
  * TracStandalone#UsingAuthentication if you use the standalone server, `tracd`.
  * [wiki:TracModWSGI#ConfiguringAuthentication TracModWSGI#ConfiguringAuthentication] if you use the Apache web server, with any of its front end: `mod_wsgi` of course, but the same instructions applies also for `mod_python`, `mod_fcgi` or `mod_fastcgi`.
+ * [wiki:TracModWSGI#ConfiguringAuthentication TracModWSGI#ConfiguringAuthentication] if you use the Apache web server, with any of its front end: `mod_wsgi`, `mod_python`, `mod_fcgi` or `mod_fastcgi`.
  * TracFastCgi if you're using another web server with FCGI support (Cherokee, Lighttpd, !LiteSpeed, nginx)
 The following document also constains some useful information for beginners: [trac:TracAuthenticationIntroduction].
+[trac:TracAuthenticationIntroduction] also contains some useful information for beginners.
 == Granting admin rights to the admin user
 Grant admin rights to user admin:
 {{{
+{{{#!sh
 $ trac-admin /path/to/myproject permission add admin TRAC_ADMIN
 }}}
+This user will have an "Admin" entry menu that will allow you to administrate your Trac project.
+This user will have an //Admin// navigation item that directs to pages for administering your Trac project.
 == Finishing the install
 …
 Support for version control systems is provided by optional components in Trac and the components are disabled by default //(since 1.0)//. Subversion and Git must be explicitly enabled if you wish to use them. See TracRepositoryAdmin for more details.
 The components can be enabled by adding the following to the `[components]` section of your [TracIni#components-section trac.ini], or enabling the components in the "Plugins" admin panel.
 {{{
+The version control systems are enabled by adding the following to the `[components]` section of your [TracIni#components-section trac.ini], or enabling the components in the "Plugins" admin panel.
+{{{#!ini
 tracopt.versioncontrol.svn.* = enabled
 }}}
 {{{
+{{{#!ini
 tracopt.versioncontrol.git.* = enabled
 }}}
+After enabling the components, repositories can be configured through the "Repositories" admin panel or by editing [TracIni#repositories-section trac.ini].
+=== Automatic reference to the SVN changesets in Trac tickets ===
+You can configure SVN to automatically add a reference to the changeset into the ticket comments, whenever changes are committed to the repository. The description of the commit needs to contain one of the following formulas:
+ * '''`Refs #123`''' - to reference this changeset in `#123` ticket
+ * '''`Fixes #123`''' - to reference this changeset and close `#123` ticket with the default status ''fixed''
+This functionality requires a post-commit hook to be installed as described in [wiki:TracRepositoryAdmin#ExplicitSync TracRepositoryAdmin], and enabling the optional commit updater components by adding the following line to the `[components]` section of your [wiki:TracIni#components-section trac.ini], or enabling the components in the "Plugins" admin panel.
+{{{
+tracopt.ticket.commit_updater.* = enabled
+}}}
+For more information, see the documentation of the `CommitTicketUpdater` component in the "Plugins" admin panel.
+=== Using Trac ===
+After enabling the components, repositories can be configured through the //Repositories// admin panel or by editing [TracIni#repositories-section trac.ini]. Automatic changeset references can be inserted as ticket comments by configuring [TracRepositoryAdmin#Automaticchangesetreferencesintickets CommitTicketUpdater].
+=== Using Trac
 Once you have your Trac site up and running, you should be able to create tickets, view the timeline, browse your version control repository if configured, etc.
 Keep in mind that //anonymous// (not logged in) users can by default access only a few of the features, in particular they will have a read-only access to the resources. You will need to configure authentication and grant additional [wiki:TracPermissions permissions] to authenticated users to see the full set of features.
+Keep in mind that //anonymous// (not logged in) users can by default access only a few of the features, in particular they will have a read-only access to the resources. You will need to configure authentication and grant additional [TracPermissions permissions] to authenticated users to see the full set of features.
 '' Enjoy! ''