Changes between Version 4 and Version 5 of TracCgi


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Timestamp:
Mar 21, 2016, 6:54:06 PM (20 months ago)
Author:
trac
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  • TracCgi

    v4 v5  
    1 = Installing Trac as CGI =
     1= Installing Trac as CGI
    22
    3 To install Trac as a CGI script, you need to make the `trac.cgi` executable as a CGI by your web server.
    4 
    5   ''Please note that using Trac via CGI is significantly slower than any other deployment method, such as [TracModPython mod_python] or [TracFastCgi FastCGI].''
    6 
    7 If you're using [http://httpd.apache.org/ Apache HTTPD], there are a couple ways to do that:
    8 
    9  1. Use a `ScriptAlias` to map a URL to the `trac.cgi` script
    10  2. Copy the `trac.cgi` file into the directory for CGI executables used by your web server (commonly named `cgi-bin`). You can also create a symbolic link, but in that case make sure that the `FollowSymLinks` option is enabled for the `cgi-bin` directory.
    11 
    12 The first option is recommended as it also allows you to map the CGI to a friendly URL.
    13 
    14 Now, edit the Apache configuration file and add this snippet, file names and locations changed to match your installation:
    15 {{{
    16 ScriptAlias /trac /usr/share/trac/cgi-bin/trac.cgi
     3{{{#!div class=important
     4  ''Please note that using Trac via CGI is the slowest deployment method available. It is slower than [TracModPython mod_python], [TracFastCgi FastCGI] and even [trac:TracOnWindowsIisAjp IIS/AJP] on Windows.''
    175}}}
    186
    19  ''Note that this directive requires the `mod_alias` module to be installed and enabled.''
     7CGI script is the entrypoint that web-server calls when a web-request to an application is made. To generate the `trac.cgi` script run:
     8{{{#!sh
     9trac-admin /path/to/env deploy /path/to/www/trac
     10}}}
     11`trac.cgi` will be in the `cgi-bin` folder inside the given path. ''Make sure it is executable by your web server''. This command also copies `static resource` files to a `htdocs` directory of a given destination.
     12
     13== Apache web-server configuration
     14
     15In [http://httpd.apache.org/ Apache] there are two ways to run Trac as CGI:
     16
     17 1. Use a `ScriptAlias` directive that maps an URL to the `trac.cgi` script (recommended)
     18 1. Copy the `trac.cgi` file into the directory for CGI executables used by your web server (commonly named `cgi-bin`). You can also create a symbolic link, but in that case make sure that the `FollowSymLinks` option is enabled for the `cgi-bin` directory.
     19
     20To make Trac available at `http://yourhost.example.org/trac` add `ScriptAlias` directive to Apache configuration file, changing `trac.cgi` path to match your installation:
     21{{{#!sh
     22ScriptAlias /trac /path/to/www/trac/cgi-bin/trac.cgi
     23}}}
     24
     25 ''Note that this directive requires enabled `mod_alias` module.''
    2026
    2127If you're using Trac with a single project you need to set its location using the `TRAC_ENV` environment variable:
    22 {{{
     28{{{#!apache
    2329<Location "/trac">
    2430  SetEnv TRAC_ENV "/path/to/projectenv"
     
    2733
    2834Or to use multiple projects you can specify their common parent directory using the `TRAC_ENV_PARENT_DIR` variable:
    29 {{{
     35{{{#!apache
    3036<Location "/trac">
    3137  SetEnv TRAC_ENV_PARENT_DIR "/path/to/project/parent/dir"
     
    3339}}}
    3440
    35  ''Note that the `SetEnv` directive requires the `mod_env` module to be installed and enable. If not, you could set TRAC_ENV in trac.cgi. Just add the following code between "try:" and "from trac.web ...":''
     41 ''Note that the `SetEnv` directive requires enabled `mod_env` module. It is also possible to set TRAC_ENV in trac.cgi. Just add the following code between "try:" and "from trac.web ...":''
    3642
    37 {{{
     43{{{#!python
    3844    import os
    3945    os.environ['TRAC_ENV'] = "/path/to/projectenv"
     
    4248 '' Or for TRAC_ENV_PARENT_DIR: ''
    4349
    44 {{{
     50{{{#!python
    4551    import os
    4652    os.environ['TRAC_ENV_PARENT_DIR'] = "/path/to/project/parent/dir"
    4753}}}
    4854
    49 This will make Trac available at `http://yourhost.example.org/trac`.
    50 
    51 If you are using the [http://httpd.apache.org/docs/suexec.html Apache suEXEC] feature please see [http://trac.edgewall.org/wiki/ApacheSuexec].
     55If you are using the [http://httpd.apache.org/docs/suexec.html Apache suEXEC] feature please see [trac:ApacheSuexec].
    5256
    5357On some systems, you ''may'' need to edit the shebang line in the `trac.cgi` file to point to your real Python installation path. On a Windows system you may need to configure Windows to know how to execute a .cgi file (Explorer -> Tools -> Folder Options -> File Types -> CGI).
    5458
    55 == Mapping Static Resources ==
     59=== Using WSGI
    5660
    57 Out of the box, Trac will serve static resources such as style sheets or images itself. For a CGI setup, though, this is highly undesirable, because it results in the CGI script being invoked for documents that could be much more efficiently served by the web server directly.
     61You can run a [http://henry.precheur.org/python/how_to_serve_cgi WSGI handler] [http://pythonweb.org/projects/webmodules/doc/0.5.3/html_multipage/lib/example-webserver-web-wsgi-simple-cgi.html under CGI].  You can [wiki:TracModWSGI#Thetrac.wsgiscript write your own application function], or use the deployed trac.wsgi's application.
    5862
    59 Web servers such as [http://httpd.apache.org/ Apache HTTPD] allow you to create “Aliases” to resources, thereby giving them a virtual URL that doesn't necessarily bear any resemblance to the layout of the servers file system. We already used this capability above when defining a `ScriptAlias` for the CGI script, and we'll use it now to map requests to the static resources to the directory on the file system that contains them, thereby bypassing the processing of such requests by the CGI script.
     63== Mapping Static Resources
    6064
    61 Edit the Apache configuration file again and add the following snippet '''before''' the `ScriptAlias` for the CGI script , file names and locations changed to match your installation:
    62 {{{
    63 Alias /trac/chrome/common /usr/share/trac/htdocs
    64 <Directory "/usr/share/trac/htdocs">
    65   Order allow,deny
    66   Allow from all
    67 </Directory>
    68 }}}
     65See TracInstall#MappingStaticResources.
    6966
    70 Note that whatever URL path you mapped the `trac.cgi` script to, the path `/chrome/common` is the path you have to append to that location to intercept requests to the static resources.
     67== Adding Authentication
    7168
    72 For example, if Trac is mapped to `/cgi-bin/trac.cgi` on your server, the URL of the Alias should be `/cgi-bin/trac.cgi/chrome/common`.
    73 
    74 Similarly, if you have static resources in a projects htdocs directory, you can configure apache to serve those resources (again, put this '''before''' the `ScriptAlias` for the CGI script, and adjust names and locations to match your installation):
    75 
    76 {{{
    77 Alias /trac/chrome/site /path/to/projectenv/htdocs
    78 <Directory "/path/to/projectenv/htdocs">
    79   Order allow,deny
    80   Allow from all
    81 </Directory>
    82 }}}
    83 
    84 Alternatively, you can set the `htdocs_location` configuration option in [wiki:TracIni trac.ini]:
    85 {{{
    86 [trac]
    87 htdocs_location = /trac-htdocs
    88 }}}
    89 
    90 Trac will then use this URL when embedding static resources into HTML pages. Of course, you still need to make the Trac `htdocs` 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:
    91 {{{
    92 $ ln -s /usr/share/trac/htdocs /var/www/your_site.com/htdocs/trac-htdocs
    93 }}}
    94 
    95 Note that in order to get this `htdocs` directory, you need first to extract the relevant Trac resources using the `deploy` command of TracAdmin:
    96 [[TracAdminHelp(deploy)]]
    97 
    98 
    99 == Adding Authentication ==
    100 
    101 The simplest way to enable authentication with Apache is to create a password file. Use the `htpasswd` program to create the password file:
    102 {{{
    103 $ htpasswd -c /somewhere/trac.htpasswd admin
    104 New password: <type password>
    105 Re-type new password: <type password again>
    106 Adding password for user admin
    107 }}}
    108 
    109 After the first user, you dont need the "-c" option anymore:
    110 {{{
    111 $ htpasswd /somewhere/trac.htpasswd john
    112 New password: <type password>
    113 Re-type new password: <type password again>
    114 Adding password for user john
    115 }}}
    116 
    117   ''See the man page for `htpasswd` for full documentation.''
    118 
    119 After you've created the users, you can set their permissions using TracPermissions.
    120 
    121 Now, you'll need to enable authentication against the password file in the Apache configuration:
    122 {{{
    123 <Location "/trac/login">
    124   AuthType Basic
    125   AuthName "Trac"
    126   AuthUserFile /somewhere/trac.htpasswd
    127   Require valid-user
    128 </Location>
    129 }}}
    130 
    131 If you're hosting multiple projects you can use the same password file for all of them:
    132 {{{
    133 <LocationMatch "/trac/[^/]+/login">
    134   AuthType Basic
    135   AuthName "Trac"
    136   AuthUserFile /somewhere/trac.htpasswd
    137   Require valid-user
    138 </LocationMatch>
    139 }}}
    140 
    141 For better security, it is recommended that you either enable SSL or at least use the “Digest” authentication scheme instead of “Basic”. Please read the [http://httpd.apache.org/docs/2.0/ Apache HTTPD documentation] to find out more. For example, on a Debian 4.0r1 (etch) system the relevant section  in apache configuration can look like this:
    142 {{{
    143 <Location "/trac/login">
    144     LoadModule auth_digest_module /usr/lib/apache2/modules/mod_auth_digest.so
    145     AuthType Digest
    146     AuthName "trac"
    147     AuthDigestDomain /trac
    148     AuthDigestFile /somewhere/trac.htpasswd
    149     Require valid-user
    150 </Location>
    151 }}}
    152 and you'll have to create your .htpasswd file with htdigest instead of htpasswd as follows:
    153 {{{
    154 # htdigest /somewhere/trac.htpasswd trac admin
    155 }}}
    156 where the "trac" parameter above is the same as !AuthName above  ("Realm" in apache-docs).
     69See TracInstall#ConfiguringAuthentication.
    15770
    15871----
    159 See also:  TracGuide, TracInstall, TracFastCgi, TracModPython
     72See also:  TracGuide, TracInstall, [wiki:TracModWSGI], TracFastCgi, TracModPython