Changes between Version 4 and Version 5 of TracModPython


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Timestamp:
05/30/11 20:19:38 (13 years ago)
Author:
trac
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  • TracModPython

    v4 v5  
    44Trac 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. 
    55 
    6 These instructions are for Apache 2; if you are still using Apache 1.3, you may have some luck with [wiki:TracModPython2.7 TracModPython2.7]. 
     6These instructions are for Apache 2; if you are still using Apache 1.3, you may have some luck with [trac:wiki:TracModPython2.7 TracModPython2.7]. 
     7 
     8== A Word of Warning == 
     9 
     10As of 16^th^ June 2010, the mod_python project is officially dead.  If you are considering using mod_python for a new installation, '''please don't'''!  There are known issues which will not be fixed and there are now better alternatives.  Check out the main TracInstall pages for your target version for more information. 
    711 
    812== Simple configuration == 
    … …  
    1317}}} 
    1418 
    15  ''Note: The exact path to the module depends on how the HTTPD installation is laid out.'' 
     19''Note: The exact path to the module depends on how the HTTPD installation is laid out.'' 
     20 
    1621On Debian using apt-get 
    1722{{{ 
    … …  
    2025(Still on Debian) after you have installed mod_python, you must enable the modules in apache2 (equivalent of the above Load Module directive): 
    2126{{{ 
    22 a2enmod mod_python 
     27a2enmod python 
    2328}}} 
    2429On Fedora use, using yum: 
    … …  
    3338   PythonInterpreter main_interpreter 
    3439   PythonHandler mod_python.testhandler 
     40   Order allow,deny 
     41   Allow from all 
    3542</Location> 
    3643}}} 
    … …  
    4552   PythonOption TracEnv /var/trac/myproject 
    4653   PythonOption TracUriRoot /projects/myproject 
     54   Order allow,deny 
     55   Allow from all 
    4756</Location> 
    4857}}} 
    … …  
    5766    PythonOption TracEnvParentDir /var/trac/myprojects 
    5867    # For the index of multiple projects 
    59     PythonOption TracEnvIndexTemplate /srv/www/htdocs/trac/project_list_tepmlate.html 
     68    PythonOption TracEnvIndexTemplate /srv/www/htdocs/trac/project_list_template.html 
    6069    # A space delimitted list, with a "," between key and value pairs. 
    6170    PythonOption TracTemplateVars key1,val1 key2,val2 
    … …  
    6675}}} 
    6776 
     77=== Python Egg Cache === 
     78 
     79Compressed python eggs like Genshi are normally extracted into a directory named `.python-eggs` in the users home directory. Since apache's home usually is not writable an alternate egg cache directory can be specified like this: 
     80{{{ 
     81PythonOption PYTHON_EGG_CACHE /var/trac/myprojects/egg-cache 
     82}}} 
     83 
     84or you can uncompress the Genshi egg to resolve problems extracting from it. 
    6885=== Configuring Authentication === 
    6986 
    … …  
    141158 
    142159 
     160=== Setting the Python Egg Cache === 
     161 
     162If the Egg Cache isn't writeable by your Web server, you'll either have to change the permissions, or point Python to a location where Apache can write. This can manifest itself as a ''500 internal server error'' and/or a complaint in the syslog.  
     163 
     164{{{ 
     165#!xml 
     166<Location /projects/myproject> 
     167  ... 
     168  PythonOption PYTHON_EGG_CACHE /tmp  
     169  ... 
     170</Location> 
     171}}} 
     172 
    143173 
    144174=== Setting the !PythonPath === 
    … …  
    217247}}} 
    218248 
    219 if you have issues with login try using `<LocationMatch>` instead of `<Location>` 
     249This does not seem to work in all cases. What you can do if it does not: 
     250 * Try using `<LocationMatch>` instead of `<Location>` 
     251 * <Location /> may, in your server setup, refer to the complete host instead of simple the root of the server. This means that everything (including the login directory referenced below) will be sent to python and authentication does not work (i.e. you get the infamous Authentication information missing error). If this applies to you, try using a sub-directory for trac instead of the root (i.e. /web/ and /web/login instead of / and /login). 
     252 * Depending on apache's `NameVirtualHost` configuration, you may need to use `<VirtualHost *:80>` instead of `<VirtualHost *>`. 
    220253 
    221254For a virtual host that supports multiple projects replace "`TracEnv`" /var/trac/myproject with "`TracEnvParentDir`" /var/trac/ 
    222255 
    223 Note: !DocumentRoot should not point to your Trac project env. As Asmodai wrote on #trac: "suppose there's a webserer bug that allows disclosure of !DocumentRoot they could then leech the entire Trac environment". 
     256Note: !DocumentRoot should not point to your Trac project env. As Asmodai wrote on #trac: "suppose there's a webserver bug that allows disclosure of !DocumentRoot they could then leech the entire Trac environment". 
    224257 
    225258== Troubleshooting == 
    … …  
    256289Using <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. 
    257290 
     291=== Problem with zipped egg === 
     292 
     293It's possible that your version of mod_python will not import modules from zipped eggs. If you encounter an `ImportError: No module named trac` in your Apache logs but you think everything is where it should be, this might be your problem. Look in your site-packages directory; if the Trac module appears as a ''file'' rather than a ''directory'', then this might be your problem. To rectify, try installing Trac using the `--always-unzip` option, like this: 
     294 
     295{{{ 
     296easy_install --always-unzip Trac-0.12b1.zip 
     297}}} 
     298 
    258299=== Using .htaccess === 
    259300 
    … …  
    261302 
    262303It 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. :) 
     304 
     305A success story: For me it worked out-of-box, with following trivial config: 
     306{{{ 
     307SetHandler mod_python 
     308PythonInterpreter main_interpreter 
     309PythonHandler trac.web.modpython_frontend  
     310PythonOption TracEnv /system/path/to/this/directory 
     311PythonOption TracUriRoot /path/on/apache 
     312 
     313AuthType Basic 
     314AuthName "ProjectName" 
     315AuthUserFile /path/to/.htpasswd 
     316Require valid-user 
     317}}} 
     318 
     319The `TracUriRoot` is obviously the path you need to enter to the browser to get to the trac (e.g. domain.tld/projects/trac) 
     320 
     321=== Additional .htaccess help === 
     322 
     323If you are using the .htaccess method you may have additional problems if your trac directory is inheriting .htaccess directives from another.  This may also help to add to your .htaccess file: 
     324 
     325{{{ 
     326<IfModule mod_rewrite.c> 
     327  RewriteEngine Off 
     328</IfModule> 
     329}}} 
     330 
    263331 
    264332=== Win32 Issues === 
    … …  
    279347}}} 
    280348 
    281 See also [[http://subversion.tigris.org/faq.html#reposperms]] 
     349See also [http://subversion.tigris.org/faq.html#reposperms] 
    282350 
    283351=== FreeBSD issues === 
    … …  
    285353 
    286354If you compiled and installed apache2, apache wouldn´t support threads (cause it doesn´t work very well on FreeBSD). You could force thread support when running ./configure for apache, using --enable-threads, but this isn´t recommendable. 
    287 The best option [[http://modpython.org/pipermail/mod_python/2006-September/021983.html seems to be]] adding to /usr/local/apache2/bin/ennvars the line  
     355The best option [http://modpython.org/pipermail/mod_python/2006-September/021983.html seems to be] adding to /usr/local/apache2/bin/ennvars the line  
    288356 
    289357{{{ 
    … …  
    297365If 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`). 
    298366 
    299 You also need a recent version of `mod_python` in order to avoid a runtime error ({{{argument number 2: a 'apr_pool_t *' is expected}}}) due to the default usage of multiple sub-interpreters. 3.2.8 ''should'' work, though it's probably better to use the workaround described in #3371, in order to force the use of the main interpreter: 
     367You also need a recent version of `mod_python` in order to avoid a runtime error ({{{argument number 2: a 'apr_pool_t *' is expected}}}) due to the default usage of multiple sub-interpreters. 3.2.8 ''should'' work, though it's probably better to use the workaround described in [trac:#3371 #3371], in order to force the use of the main interpreter: 
    300368{{{ 
    301369PythonInterpreter main_interpreter 
    302370}}} 
    303 This is anyway the recommended workaround for other well-known issues seen when using the Python bindings for Subversion within mod_python (#2611, #3455). See in particular Graham Dumpleton's comment in [comment:ticket:3455:9 #3455] explaining the issue. 
     371This is anyway the recommended workaround for other well-known issues seen when using the Python bindings for Subversion within mod_python ([trac:#2611 #2611], [trac:#3455 #3455]). See in particular Graham Dumpleton's comment in [trac:comment:9:ticket:3455 #3455] explaining the issue. 
    304372 
    305373=== Page layout issues === 
    … …  
    315383 
    316384Note: For the above configuration to have any effect it must be put after the configuration of your project root location, i.e. {{{<Location /myproject />}}}. 
     385 
     386Also, setting `PythonOptimize On` seems to mess up the page headers and footers, in addition to hiding the documentation for macros and plugins (see #Trac8956). Considering how little effect the option has, it is probably a good idea to leave it `Off`. 
    317387 
    318388=== HTTPS issues === 
    … …  
    334404 
    335405=== Segmentation fault with php5-mhash or other php5 modules === 
    336 You may encounter segfaults (reported on debian etch) if php5-mhash module is installed. Try to remove it to see if this solves the problem. See debian bug report [[http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=411487]] 
    337  
    338 Some people also have troubles when using php5 compiled with its own 3rd party libraries instead of system libraries. Check here [[http://www.djangoproject.com/documentation/modpython/#if-you-get-a-segmentation-fault]] 
     406You may encounter segfaults (reported on debian etch) if php5-mhash module is installed. Try to remove it to see if this solves the problem. See debian bug report [http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=411487] 
     407 
     408Some people also have troubles when using php5 compiled with its own 3rd party libraries instead of system libraries. Check here [http://www.djangoproject.com/documentation/modpython/#if-you-get-a-segmentation-fault] 
    339409 
    340410---- 
    341 See also TracGuide, TracInstall, TracCgi, TracFastCgi 
     411See also:  TracGuide, TracInstall, [wiki:TracModWSGI ModWSGI], [wiki:TracFastCgi FastCGI],  [trac:TracNginxRecipe TracNginxRecipe]