Changes between Version 2 and Version 3 of TracModPython


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Timestamp:
2011-04-02T22:36:15Z (14 years ago)
Author:
trac
Comment:

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  • TracModPython

    v2 v3  
    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
    … …  
    6473    # See description above       
    6574    PythonOption TracUriRoot /projects/myproject
    66     # Override default python egg cache location
    67     PythonOption PYTHON_EGG_CACHE /var/trac/myprojects/egg-cache
    68 }}}
    69 
     75}}}
     76
     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.
    7085=== Configuring Authentication ===
    7186
    … …  
    143158
    144159
     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
    145173
    146174=== Setting the !PythonPath ===
    … …  
    219247}}}
    220248
    221 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 *>`.
    222253
    223254For a virtual host that supports multiple projects replace "`TracEnv`" /var/trac/myproject with "`TracEnvParentDir`" /var/trac/
    224255
    225 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".
    226257
    227258== Troubleshooting ==
    … …  
    258289Using <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.
    259290
     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
    260299=== Using .htaccess ===
    261300
    … …  
    263302
    264303It 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
    265331
    266332=== Win32 Issues ===
    … …  
    281347}}}
    282348
    283 See also [[http://subversion.tigris.org/faq.html#reposperms]]
     349See also [http://subversion.tigris.org/faq.html#reposperms]
    284350
    285351=== FreeBSD issues ===
    … …  
    287353
    288354If 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.
    289 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
    290356
    291357{{{
    … …  
    299365If 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`).
    300366
    301 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:
    302368{{{
    303369PythonInterpreter main_interpreter
    304370}}}
    305 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.
    306372
    307373=== Page layout issues ===
    … …  
    317383
    318384Note: 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`.
    319387
    320388=== HTTPS issues ===
    … …  
    336404
    337405=== Segmentation fault with php5-mhash or other php5 modules ===
    338 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]]
    339 
    340 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]
    341409
    342410----
    343 See also TracGuide, TracInstall, TracCgi, TracFastCgi
     411See also:  TracGuide, TracInstall, [wiki:TracModWSGI ModWSGI], [wiki:TracFastCgi FastCGI],  [trac:TracNginxRecipe TracNginxRecipe]