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POHow to easy_install egg plugin and load it without restarting application?
 

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  1. POHow to easy_install egg plugin and load it without restarting application?
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    <p>I'm creating an app that downloads and installs its own egg plugins, but I have a problem loading the egg after easy_install extracts it into place. This is how it works now:</p> <ul> <li>App downloads egg into temp folder</li> <li>Installs egg with setuptools.command.easy_install.main() into ~/.app/plugins folder (which is pointed by a pth on dist-packages)</li> <li>At this point, the ~/.apps/plugins/easy-install.pth is updated with the new egg path</li> </ul> <p>The problem is that the pth is not reloaded until the python process is relaunched, which means the app has to be stopped and restarted (app is a long-running process, and plugin installation must not require a restart).</p> <p>So the question is how to, either reload the pth programatically so that plugin entry-point discovery works for the new egg, or somehow have easy_install return the path it installed the egg into, so I can manually (with pkg_resources) load the new plugin?</p> <p>I could create a function that tries to guess the easy_install'ed path or parse the pth on my own, but I prefer not to, if at all possible.</p> <p>Python 2.6, setuptools 0.6c9</p> <hr> <p>Thanks to <a href="https://stackoverflow.com/questions/3231011/how-to-easy-install-egg-plugin-and-load-it-without-restarting-application/3249176#3249176">Marius Gedminas</a>, what I'm doing now basically is:</p> <pre><code>dist = pkg_resources.get_distribution(plugin_name) entry = dist.get_entry_info(entry_point_name, plugin_name) plugin = entry.load() </code></pre>
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    1. COI don't know much about setuptools, but have you tried `reload` function? [docs](http://docs.python.org/library/functions.html#reload) or http://stackoverflow.com/questions/437589/how-do-i-unload-reload-a-python-module ?
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    2. COYes i did, but reload is not enough. I tried reloading the site module (which I think is responsible for reading pth) but it did nothing. Even site.addsitedir(os.path.expanduser('~/.app/plugins')), which seems to add the new egg into sys.path list, is not enough to make it importable (import plugin_name) or discoverable for pkg_resources.
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    3. COzc.buildout does something like this, although I wouldn't want to try reading its source code. Have you tried asking on the distutils-sig mailing list?
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      1. USMarius Gedminas
 

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