Edgewall Software

Changes between Version 93 and Version 94 of TracPlugins


Ignore:
Timestamp:
Apr 2, 2017, 1:07:35 AM (7 years ago)
Author:
Ryan J Ollos
Comment:

Minor edits and add section on upgrading plugins. Remove section describing how to install setuptools, since this is covered in TracInstall and setuptools.

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  • TracPlugins

    v93 v94  
    77== Plugin discovery
    88
    9 From the user's point of view, a plugin is either a standalone .py file or an .egg package. Trac looks for plugins in Python's `site-packages` directory, the [TracIni#GlobalConfiguration global shared] `plugins` directory and the [TracEnvironment project environment] `plugins` directory. Components defined in globally-installed plugins must be explicitly enabled in the [[TracIni#components-section| [components] ]] section of the `trac.ini` file. Components defined in the `plugins` directory of the project environment are enabled, unless explicitly disabled in the `[components]` section of the `trac.ini` file.
    10 
    11 == Requirements for Trac eggs #Requirements
    12 
    13 To use egg-based plugins in Trac, you need to have [http://peak.telecommunity.com/DevCenter/setuptools setuptools] (version >= 0.6) installed.
    14 
    15 To install `setuptools`, download the bootstrap module [http://peak.telecommunity.com/dist/ez_setup.py ez_setup.py] and execute it as follows:
    16 
    17 {{{#!sh
    18 $ python ez_setup.py
    19 }}}
    20 
    21 If the `ez_setup.py` script fails to install the setuptools release, you can download it from [pypi:setuptools PyPI] and install it manually.
    22 
    23 Plugins can also consist of a single `.py` file dropped directly into either the project's or the shared `plugins` directory.
     9From the user's point of view, a plugin is either a standalone .py file or a package (egg or wheel). Trac looks for plugins in Python's `site-packages` directory, the [TracIni#GlobalConfiguration global shared] `plugins` directory and the [TracEnvironment project environment] `plugins` directory. Components defined in globally-installed plugins must be explicitly enabled in the [[TracIni#components-section| [components] ]] section of the `trac.ini` file. Components defined in the `plugins` directory of the project environment are enabled, unless explicitly disabled in the `[components]` section of the `trac.ini` file.
    2410
    2511== Installing a Trac plugin
    … …  
    3925You should now have an *.egg file. Examine the output of running Python to find where this was created.
    4026
    41 Once you have the plugin archive, copy it into the `plugins` directory of the [wiki:TracEnvironment project environment]. Also, make sure that the web server has sufficient permissions to read the plugin egg. Then restart the web server. If you are running as a [wiki:TracStandalone "tracd" standalone server], restart tracd, ie kill the process and run again.
     27Once you have the plugin archive, copy it into the `plugins` directory of the [TracEnvironment project environment]. Also, make sure that the web server has sufficient permissions to read the plugin egg. Then restart the web server. If you are running as a [TracStandalone "tracd" standalone server], restart tracd, ie kill the process and run again.
    4228
    4329To uninstall a plugin installed this way, remove the egg from the `plugins` directory and restart the web server.
    … …  
    5440{{{#!sh
    5541$ easy_install TracTags
     42}}}
     43{{{#!sh
    5644$ pip install TracTags
    5745}}}
    … …  
    7159==== From source
    7260
    73 `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:
     61`easy_install` and `pip` make installing from source a snap. Just give it the URL to either a repository or a tarball/zip of the source:
    7462{{{#!sh
    7563$ easy_install https://trac-hacks.org/svn/tagsplugin/trunk
    7664}}}
     65{{{#!sh
     66$ pip install svn+https://trac-hacks.org/svn/tagsplugin/trunk
     67}}}
     68When installing from a repository using `pip`, be sure to use the repository type in the protocol. For example, `svn+https` for Subversion and `git+https` for Git.
    7769
    7870==== Enabling the plugin
    7971
    80 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 shared plugins directory, ie the path specified in the `[inherit] plugins_dir` configuration option.
    81 
    82 This is done in the `[components]` section of the configuration file `trac.ini`. For example:
     72Unlike plugins installed per environment, you'll have to explicitly enable globally installed plugins via [TracIni trac.ini]. This also applies to plugins installed in the shared plugins directory, ie the path specified in the [TracIni#inherit-plugins_dir-option "[inherit] plugins_dir"] configuration option.
     73
     74This is done in the [TracIni#components-section "[components]"] section of the configuration file `trac.ini`. For example:
    8375{{{#!ini
    8476[components]
    … …  
    119111}}}
    120112
     113==== Upgrading a Plugin
     114
     115Normally, upgrading a plugin is simply a matter of repeating the install process. You may want to [#Uninstalling uninstall] old versions of the plugin.
     116
     117The `pip install` command has an `--upgrade (-U)` switch that will uninstall the old version and install the new version. The command can have some unintended side-effects though, because it will also upgrade the plugin dependencies. For example, if `Trac` is listed as a dependency of the plugin in `setup.py`, the latest version of Trac will be downloaded and installed. This may not be what you want if you are running an older version of Trac because not all your plugins are compatible with the latest version of Trac, or you simply haven't done the appropriate planning for upgrading Trac. Uninstalling and then installing the plugin can be a safer option:
     118{{{#!sh
     119$ pip uninstall <pluginname>
     120$ pip install <pluginname>
     121}}}
     122
     123Alternatively you can use a [https://pip.pypa.io/en/stable/user_guide/#requirements-files requirements file] and pin the versions of the packages that you don't want to implicitly upgrade.
     124
    121125==== Uninstalling
    122126
     127`pip` makes it easy to uninstall a plugin:
     128{{{#!sh
     129$ pip uninstall <pluginname>
     130}}}
     131
     132The `pip uninstall` command can be used even if the plugin was installed using `easy_install` or `python setup.py install`.
     133
    123134Neither `easy_install` nor `python setup.py` have an uninstall feature. However, it is usually trivial to remove a globally installed egg and reference:
    124135
    125  1. Do `easy_install -m [plugin name]` to remove references from `$PYTHONLIB/site-packages/easy-install.pth` when the plugin installed by setuptools.
     136 1. Do `easy_install -m <plugin name>` to remove references from `$PYTHONLIB/site-packages/easy-install.pth` when the plugin is installed by setuptools.
    126137 1. Delete executables from `/usr/bin`, `/usr/local/bin`, or `C:\\Python*\Scripts`. To find what executables are involved, refer to the `[console-script]` section of `setup.py`.
    127138 1. Delete the .egg file or folder from where it's installed, usually inside `$PYTHONLIB/site-packages/`.
    … …  
    144155}}}
    145156
    146 This works whether you're using the [wiki:TracCgi CGI] or the [wiki:TracModPython mod_python] front-end. Put this directive next to where you set the path to the [wiki:TracEnvironment Trac environment], ie in the same `<Location>` block.
    147 
    148 For example for CGI:
     157This works whether you're using the [TracCgi CGI] or the [TracModPython mod_python] front-end. Put this directive next to where you set the path to the [TracEnvironment Trac environment], ie in the same `<Location>` block.
     158
     159Example for CGI:
    149160{{{#!apache
    150161 <Location /trac>
    … …  
    165176'''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.
    166177
    167 For [wiki:TracFastCgi FastCGI], you'll need to `-initial-env` option, or whatever is provided by your web server for setting environment variables.
     178For [TracFastCgi FastCGI], you'll need to `-initial-env` option, or whatever is provided by your web server for setting environment variables.
    168179
    169180'''Note''': 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:
    … …  
    179190== Web-based plugin administration
    180191
    181 The [trac:WebAdmin] interface offers limited support for plugin configuration through the web to users with `TRAC_ADMIN` permission:
    182 
    183 * en/disabling installed plugins
     192The [trac:WebAdmin] interface offers limited support for plugin configuration to users with `TRAC_ADMIN` permission:
     193
     194* enabling and disabling installed plugins
    184195* installing plugins by uploading them as eggs
    185196
    … …  
    223234=== Check the log files
    224235
    225 Enable [wiki:TracLogging logging] and set the log level to `DEBUG`, then watch the log file for messages about loading plugins.
     236Enable [TracLogging logging] and set the log level to `DEBUG`, then watch the log file for messages about loading plugins.
    226237
    227238=== Verify you have the proper permissions
    … …  
    231242=== Is the wrong version of the plugin loading?
    232243
    233 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:
     244If you put your plugins inside the `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:
    234245
    235246 * 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.
    … …  
    240251=== If all of the above failed
    241252
    242 Okay, 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 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!
     253Okay, 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 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] or [trac:MailingList] and ask away!
    243254
    244255----