Changes from Version 1 of TracModPython

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trac (IP: 127.0.0.1)
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06/24/08 19:36:52 (6 years ago)
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  • TracModPython

    v0 v1  
     1= Trac and mod_python = 
     2[[TracGuideToc]] 
     3 
     4Trac supports [http://www.modpython.org/ mod_python], which speeds up Trac's response times considerably, especially compared to [TracCgi CGI], and permits use of many Apache features not possible with [wiki:TracStandalone tracd]/mod_proxy. 
     5 
     6== Simple configuration == 
     7 
     8If you just installed mod_python, you may have to add a line to load the module in the Apache configuration: 
     9{{{ 
     10LoadModule python_module modules/mod_python.so 
     11}}} 
     12 
     13 ''Note: The exact path to the module depends on how the HTTPD installation is laid out.'' 
     14 
     15You can test your mod_python installation by adding the following to your httpd.conf.  You should remove this when you are done testing for security reasons. 
     16{{{ 
     17<Location /mpinfo> 
     18   SetHandler mod_python 
     19   PythonHandler mod_python.testhandler 
     20</Location> 
     21}}} 
     22 
     23A simple setup of Trac on mod_python looks like this: 
     24{{{ 
     25<Location /projects/myproject> 
     26   SetHandler mod_python 
     27   PythonHandler trac.web.modpython_frontend  
     28   PythonOption TracEnv /var/trac/myproject 
     29   PythonOption TracUriRoot /projects/myproject 
     30</Location> 
     31}}} 
     32 
     33The option '''`TracUriRoot`''' may or may not be necessary in your setup. Try your configuration with out it, and if the URLs produced by Trac look wrong or if Trac does not seem to recognize the URLs correctly, add the '''`TracUriRoot`''' option.  You will notice that the `Location` and '''`TracUriRoot`''' have the same path. 
     34 
     35=== Configuring Authentication === 
     36 
     37Configuring authentication works just like for [wiki:TracCgi#AddingAuthentication CGI]: 
     38{{{ 
     39<Location "/projects/myproject/login"> 
     40  AuthType Basic 
     41  AuthName "myproject" 
     42  AuthUserFile /var/trac/myproject/.htpasswd 
     43  Require valid-user 
     44</Location> 
     45}}} 
     46 
     47=== Setting the !PythonPath === 
     48 
     49If the Trac installation isn't installed in your Python path, you'll have to tell Apache where to find the Trac mod_python handler  using the `PythonPath` directive: 
     50{{{ 
     51<Location /projects/myproject> 
     52  ... 
     53  PythonPath "sys.path + ['/path/to/trac']" 
     54  ... 
     55</Location> 
     56}}} 
     57 
     58Be careful about using the !PythonPath directive, and ''not'' `SetEnv PYTHONPATH`, as the latter won't work. 
     59 
     60== Setting up multiple projects == 
     61 
     62The Trac mod_python handler supports a configuration option similar to Subversion's `SvnParentPath`, called `TracEnvParentDir`: 
     63{{{ 
     64<Location /projects> 
     65  SetHandler mod_python 
     66  PythonHandler trac.web.modpython_frontend  
     67  PythonOption TracEnvParentDir /var/trac 
     68  PythonOption TracUriRoot /projects 
     69</Location> 
     70}}} 
     71 
     72When you request the `/projects` URL, you will get a listing of all subdirectories of the directory you set as `TracEnvParentDir` that look like Trac environment directories. Selecting any project in the list will bring you to the corresponding Trac environment. 
     73 
     74If you don't want to have the subdirectory listing as your projects home page you can use a 
     75{{{ 
     76<LocationMatch "/.+/"> 
     77}}} 
     78 
     79This will instruct Apache to use mod_python for all locations different from root while having the possibility of placing a custom home page for root in your !DocumentRoot folder. 
     80 
     81You can also use the same authentication realm for all of the projects using a `<LocationMatch>` directive: 
     82{{{ 
     83<LocationMatch "/projects/[^/]+/login"> 
     84  AuthType Basic 
     85  AuthName "Trac" 
     86  AuthUserFile /var/trac/.htpasswd 
     87  Require valid-user 
     88</LocationMatch> 
     89}}} 
     90 
     91== Virtual Host Configuration == 
     92 
     93Below is the sample configuration required to set up your trac as a virtual server (i.e. when you access it at the URLs like 
     94!http://trac.mycompany.com): 
     95 
     96{{{ 
     97<VirtualHost * > 
     98    DocumentRoot /var/trac/myproject 
     99    ServerName trac.mycompany.com 
     100    <Location /> 
     101        SetHandler mod_python 
     102        PythonHandler trac.web.modpython_frontend 
     103        PythonOption TracEnv /var/trac/myproject 
     104        PythonOption TracUriRoot / 
     105    </Location> 
     106    <Location /login> 
     107        AuthType Basic 
     108        AuthName "MyCompany Trac Server" 
     109        AuthUserFile /var/trac/myproject/.htpasswd 
     110        Require valid-user 
     111    </Location> 
     112</VirtualHost> 
     113}}} 
     114 
     115For a virtual host that supports multiple projects replace "`TracEnv`" /var/trac/myproject with "`TracEnvParentDir`" /var/trac/ 
     116 
     117== Troubleshooting == 
     118 
     119In general, if you get server error pages, you can either check the Apache error log, or enable the `PythonDebug` option: 
     120{{{ 
     121<Location /projects/myproject> 
     122  ... 
     123  PythonDebug on 
     124</Location> 
     125}}} 
     126 
     127=== Form submission problems === 
     128 
     129If you're experiencing problems submitting some of the forms in Trac (a common problem is that you get redirected to the start page after submission), check whether your {{{DocumentRoot}}} contains a folder or file with the same path that you mapped the mod_python handler to. For some reason, mod_python gets confused when it is mapped to a location that also matches a static resource. 
     130 
     131=== Problem with virtual host configuration === 
     132 
     133If the <Location /> directive is used, setting the `DocumentRoot` may result in a ''403 (Forbidden)'' error. Either remove the `DocumentRoot` directive, or make sure that accessing the directory it points is allowed (in a corresponding `<Directory>` block). 
     134 
     135Using <Location /> together with `SetHandler` resulted in having everything handled by mod_python, which leads to not being able download any CSS or images/icons. I used <Location /trac> `SetHandler None` </Location> to circumvent the problem, though I do not know if this is the most elegant solution. 
     136 
     137=== Using .htaccess === 
     138 
     139Although it may seem trivial to rewrite the above configuration as a directory in your document root with a `.htaccess` file, this does not work. Apache will append a "/" to any Trac URLs, which interferes with its correct operation. 
     140 
     141It may be possible to work around this with mod_rewrite, but I failed to get this working. In all, it is more hassle than it is worth. Stick to the provided instructions. :) 
     142 
     143=== Win32 Issues === 
     144If you run trac with mod_python < 3.2 on Windows, uploading attachments will '''not''' work. This problem is resolved in mod_python 3.1.4 or later, so please upgrade mod_python to fix this. 
     145 
     146=== OS X issues === 
     147 
     148When using mod_python on OS X you will not be able to restart Apache using `apachectl restart`. This is apparently fixed in mod_python 3.2, but there's also a patch available for earlier versions [http://www.dscpl.com.au/projects/vampire/patches.html here]. 
     149 
     150=== SELinux issues === 
     151 
     152If Trac reports something like: ''Cannot get shared lock on db.lock'' 
     153The security context on the repository may need to be set: 
     154 
     155{{{ 
     156chcon -R -h -t httpd_sys_content_t PATH_TO_REPOSITORY 
     157}}} 
     158 
     159See also [[http://subversion.tigris.org/faq.html#reposperms]] 
     160 
     161=== FreeBSD issues === 
     162Pay attention to the version of the installed mod_python and sqlite packages. Ports have both the new and old ones, but earlier versions of pysqlite and mod_python won't integrate as the former requires threaded support in python, and the latter requires a threadless install. 
     163 
     164=== Subversion issues === 
     165 
     166If you get the following Trac Error `Unsupported version control system "svn"` only under mod_python, though it works well on the command-line and even with TracStandalone, chances are that you forgot to add the path to the Python bindings with the [TracModPython#ConfiguringPythonPath PythonPath] directive. (The better way is to add a link to the bindings in the Python `site-packages` directory, or create a `.pth` file in that directory.) 
     167 
     168If this is not the case, it's possible that you're using Subversion libraries that are binary incompatible with the apache ones (an incompatibility of the `apr` libraries is usually the cause). In that case, you also won't be able to use the svn modules for Apache (`mod_dav_svn`). 
     169 
     170---- 
     171See also TracGuide, TracInstall, TracCgi, TracFastCgi