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# Copyright (C) 2004, 2005 by Canonical Ltd
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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"""bzr python plugin support
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Any python module in $BZR_PLUGIN_PATH will be imported upon initialization of
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bzrlib (and then forgotten about). In the plugin's main body, it should
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update any bzrlib registries it wants to extend; for example, to add new
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commands, import bzrlib.commands and add your new command to the plugin_cmds
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# TODO: Refactor this to make it more testable. The main problem at the
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# moment is that loading plugins affects the global process state -- for bzr
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# in general use it's a reasonable assumption that all plugins are loaded at
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# startup and then stay loaded, but this is less good for testing.
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# Several specific issues:
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# - plugins can't be unloaded and will continue to effect later tests
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# - load_plugins does nothing if called a second time
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# - plugin hooks can't be removed
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# Our options are either to remove these restrictions, or work around them by
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# loading the plugins into a different space than the one running the tests.
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# That could be either a separate Python interpreter or perhaps a new
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# namespace inside this interpreter.
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from bzrlib.config import config_dir
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from bzrlib.trace import log_error, mutter, log_exception, warning, \
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from bzrlib.errors import BzrError
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from bzrlib import plugins
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DEFAULT_PLUGIN_PATH = os.path.join(config_dir(), 'plugins')
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"""Find all python plugins and load them.
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Loading a plugin means importing it into the python interpreter.
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The plugin is expected to make calls to register commands when
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it's loaded (or perhaps access other hooks in future.)
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A list of plugs is stored in bzrlib.plugin.all_plugins for future
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The environment variable BZR_PLUGIN_PATH is considered a delimited
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set of paths to look through. Each entry is searched for *.py
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files (and whatever other extensions are used in the platform,
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global all_plugins, _loaded
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# People can make sure plugins are loaded, they just won't be twice
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#raise BzrError("plugins already initialized")
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dirs = os.environ.get('BZR_PLUGIN_PATH', DEFAULT_PLUGIN_PATH).split(":")
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dirs.insert(0, os.path.dirname(plugins.__file__))
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# The problem with imp.get_suffixes() is that it doesn't include
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# .pyo which is technically valid
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# It also means that "testmodule.so" will show up as both test and testmodule
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# though it is only valid as 'test'
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# but you should be careful, because "testmodule.py" loads as testmodule.
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suffixes = imp.get_suffixes()
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suffixes.append(('.pyo', 'rb', imp.PY_COMPILED))
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package_entries = ['__init__.py', '__init__.pyc', '__init__.pyo']
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# going through them one by one allows different plugins with the same
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# filename in different directories in the path
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mutter('looking for plugins in %s' % d)
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if not os.path.isdir(d):
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for f in os.listdir(d):
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path = os.path.join(d, f)
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if os.path.isdir(path):
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for entry in package_entries:
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# This directory should be a package, and thus added to
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if os.path.isfile(os.path.join(path, entry)):
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else: # This directory is not a package
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for suffix_info in suffixes:
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if f.endswith(suffix_info[0]):
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f = f[:-len(suffix_info[0])]
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if suffix_info[2] == imp.C_EXTENSION and f.endswith('module'):
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f = f[:-len('module')]
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mutter('add plugin name %s' % f)
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plugin_names = list(plugin_names)
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for name in plugin_names:
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plugin_info = imp.find_module(name, [d])
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mutter('load plugin %r' % (plugin_info,))
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plugin = imp.load_module('bzrlib.plugins.' + name,
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all_plugins.append(plugin)
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setattr(bzrlib.plugins, name, plugin)
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if plugin_info[0] is not None:
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plugin_info[0].close()
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mutter('loaded succesfully')
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warning('Unable to load plugin %r from %r' % (name, d))
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log_exception_quietly()
added
removed
bzrlib/plugin.py
