| 38 | | Unlike plugins installed per-environment, you'll have to explicitly enable globally installed plugins via [wiki:TracIni trac.ini]. This is done in the `[components]` section of the configuration file, for example: |
| | 57 | If Trac reports permission errors after installing a zipped egg and you would rather not bother providing a egg cache directory writable by the web server, you can get around it by simply unzipping the egg. Just pass `--always-unzip` to `easy_install`: |
| | 58 | {{{ |
| | 59 | easy_install --always-unzip TracSpamFilter-0.2.1dev_r5943-py2.4.egg |
| | 60 | }}} |
| | 61 | You should end up with a directory having the same name as the zipped egg (complete with `.egg` extension) and containing its uncompressed contents. |
| | 62 | |
| | 63 | Trac also searches for globally installed plugins ''(since 0.10)'', see TracIni#GlobalConfiguration. |
| | 64 | |
| | 65 | ==== From source ==== |
| | 66 | |
| | 67 | `easy_install` makes installing from source a snap. Just give it the URL to either a Subversion repository or a tarball/zip of the source: |
| | 68 | {{{ |
| | 69 | easy_install http://svn.edgewall.com/repos/trac/sandbox/spam-filter |
| | 70 | }}} |
| | 71 | |
| | 72 | ==== Enabling the plugin ==== |
| | 73 | Unlike plugins installed per-environment, you'll have to explicitly enable globally installed plugins via [wiki:TracIni trac.ini]. This also applies to plugins installed in the path specified in the `[inherit] plugins_dir` configuration option. This is done in the `[components]` section of the configuration file, for example: |
| 44 | | The name of the option is the Python package of the plugin. This should be specified in the documentation of the Plugin, but can also be easily find out by looking at the source (look for a top-level directory that contains a file named `__init__.py`.) |
| | 79 | The name of the option is the Python package of the plugin. This should be specified in the documentation of the plugin, but can also be easily discovered by looking at the source (look for a top-level directory that contains a file named `__init__.py`.) |
| | 80 | |
| | 81 | Note: After installing the plugin, you need to restart your web server. |
| | 82 | |
| | 83 | ==== Uninstalling ==== |
| | 84 | |
| | 85 | `easy_install` or `python setup.py` does not have an uninstall feature. Hower, it is usually quite trivial to remove a globally installed egg and reference: |
| | 86 | 1. Do `easy_install -m [plugin name]` to remove references from `$PYTHONLIB/site-packages/easy-install.pth` when the plugin installed by setuptools. |
| | 87 | 1. Delete executables from `/usr/bin`, `/usr/local/bin` or `C:\\Python*\Scripts`. For search what executables are there, you may refer to `[console-script]` section of `setup.py`. |
| | 88 | 1. Delete the .egg file or folder from where it is installed, usually inside `$PYTHONLIB/site-packages/`. |
| | 89 | 1. Restart web server. |
| | 90 | |
| | 91 | If you are uncertain about the location of the egg, here is a small tip to help locate an egg (or any package) - replace `myplugin` with whatever namespace the plugin uses (as used when enabling the plugin): |
| | 92 | {{{ |
| | 93 | >>> import myplugin |
| | 94 | >>> print myplugin.__file__ |
| | 95 | /opt/local/python24/lib/site-packages/myplugin-0.4.2-py2.4.egg/myplugin/__init__.pyc |
| | 96 | }}} |
| 74 | | For [wiki:TracFastCgi FastCGI], you'll need to `-initial-env` option, or whatever is provided by your web server for setting environment variables. |
| | 126 | ''Note: !SetEnv requires the `mod_env` module which needs to be activated for Apache. In this case the !SetEnv directive can also be used in the `mod_python` Location block.'' |
| | 127 | |
| | 128 | For [wiki:TracFastCgi FastCGI], you'll need to `-initial-env` option, or whatever is provided by your web server for setting environment variables. |
| | 129 | |
| | 130 | ''Note: that if you already use -initial-env to set the project directory for either a single project or parent you will need to add an additional -initial-env directive to the !FastCgiConfig directive. I.e. |
| | 131 | |
| | 132 | {{{ |
| | 133 | FastCgiConfig -initial-env TRAC_ENV=/var/lib/trac -initial-env PYTHON_EGG_CACHE=/var/lib/trac/plugin-cache |
| | 134 | }}} |
| | 135 | |
| | 136 | === About hook scripts === |
| | 137 | |
| | 138 | If you have set up some subversion hook scripts that call the Trac engine - such as the post-commit hook script provided in the `/contrib` directory - make sure you define the `PYTHON_EGG_CACHE` environment variable within these scripts as well. |
| | 139 | |
| | 140 | == Troubleshooting == |
| | 141 | |
| | 142 | === Is setuptools properly installed? === |
| | 143 | |
| | 144 | Try this from the command line: |
| | 145 | {{{ |
| | 146 | $ python -c "import pkg_resources" |
| | 147 | }}} |
| | 148 | |
| | 149 | If you get '''no output''', setuptools '''is''' installed. Otherwise, you'll need to install it before plugins will work in Trac. |
| | 150 | |
| | 151 | === Did you get the correct version of the Python egg? === |
| | 152 | |
| | 153 | Python eggs have the Python version encoded in their filename. For example, `MyPlugin-1.0-py2.4.egg` is an egg for Python 2.4, and will '''not''' be loaded if you're running a different Python version (such as 2.3 or 2.5). |
| | 154 | |
| | 155 | Also, verify that the egg file you downloaded is indeed a ZIP archive. If you downloaded it from a Trac site, chances are you downloaded the HTML preview page instead. |
| | 156 | |
| | 157 | === Is the plugin enabled? === |
| | 158 | |
| | 159 | |
| | 160 | If you install a plugin globally (i.e. ''not'' inside the `plugins` directory of the Trac project environment) you will have to explicitly enable it in [TracIni trac.ini]. Make sure that: |
| | 161 | * you actually added the necessary line(s) to the `[components]` section |
| | 162 | * the package/module names are correct |
| | 163 | * the value is “enabled", not e.g. “enable” |
| | 164 | |
| | 165 | === Check the permissions on the egg file === |
| | 166 | |
| | 167 | Trac must be able to read the file. |
| | 168 | |
| | 169 | === Check the log files === |
| | 170 | |
| | 171 | Enable [wiki:TracLogging logging] and set the log level to `DEBUG`, then watch the log file for messages about loading plugins. |
| | 172 | |
| | 173 | === Verify you have proper permissions === |
| | 174 | |
| | 175 | Some plugins require you have special permissions in order to use them. [trac:WebAdmin WebAdmin], for example, requires the user to have TRAC_ADMIN permissions for it to show up on the navigation bar. |
| | 176 | |
| | 177 | === Is the wrong version of the plugin loading? === |
| | 178 | |
| | 179 | If you put your plugins inside plugins directories, and certainly if you have more than one project, you need to make sure that the correct version of the plugin is loading. Here are some basic rules: |
| | 180 | * Only one version of the plugin can be loaded for each running Trac server (ie. each Python process). The Python namespaces and module list will be shared, and it cannot handle duplicates. Whether a plugin is `enabled` or `disabled` makes no difference. |
| | 181 | * A globally installed plugin (typically `setup.py install`) will override any version in global or project plugins directories. A plugin from the global plugins directory will be located before any project plugins directory. |
| | 182 | * If your Trac server hosts more than one project (as with `TRAC_ENV_PARENT_DIR` setups), then having two versions of a plugin in two different projects will give uncertain results. Only one of them will load, and the one loaded will be shared by both projects. Trac will load the first found - basically from the project that receives the first request. |
| | 183 | * Having more than one version listed inside Python site-packages is fine (ie. installed with `setup.py install`) - setuptools will make sure you get the version installed most recently. However, don't store more than one version inside a global or project plugins directory - neither version number nor installed date will matter at all. There is no way to determine which one will be located first when Trac searches the directory for plugins. |
| | 184 | |
| | 185 | === If all of the above failed === |
| | 186 | |
| | 187 | OK, so the logs don't mention plugins, the egg is readable, the python version is correct ''and'' the egg has been installed globally (and is enabled in the trac.ini) and it still doesn't work or give any error messages or any other indication as to why? Hop on the [trac:IrcChannel IrcChannel] and ask away. |
