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# Copyright (C) 2004, 2005 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 $BZR_PLUGIN_PATH will be imported upon initialization of
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bzrlib. The module will be imported as 'bzrlib.plugins.$BASENAME(PLUGIN)'.
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In the plugin's main body, it should update any bzrlib registries it wants to
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extend; for example, to add new commands, import bzrlib.commands and add your
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new command to the plugin_cmds variable.
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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.lazy_import import lazy_import
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lazy_import(globals(), """
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from bzrlib.trace import mutter, warning, log_exception_quietly
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DEFAULT_PLUGIN_PATH = None
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def get_default_plugin_path():
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"""Get the DEFAULT_PLUGIN_PATH"""
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global DEFAULT_PLUGIN_PATH
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if DEFAULT_PLUGIN_PATH is None:
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DEFAULT_PLUGIN_PATH = osutils.pathjoin(config.config_dir(), 'plugins')
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return DEFAULT_PLUGIN_PATH
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"""Return a dictionary of the plugins."""
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for name, plugin in plugins.__dict__.items():
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if isinstance(plugin, types.ModuleType):
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def disable_plugins():
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"""Disable loading plugins.
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Future calls to load_plugins() will be ignored.
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# TODO: jam 20060131 This should probably also disable
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"""Load bzrlib plugins.
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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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load_from_dirs() provides the underlying mechanism and is called with
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the default directory list to provide the normal behaviour.
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# People can make sure plugins are loaded, they just won't be twice
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dirs = os.environ.get('BZR_PLUGIN_PATH',
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get_default_plugin_path()).split(os.pathsep)
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dirs.insert(0, os.path.dirname(plugins.__file__))
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def load_from_dirs(dirs):
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"""Load bzrlib plugins found in each dir in dirs.
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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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Plugins are loaded into bzrlib.plugins.NAME, and can be found there
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for future reference.
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# Get the list of valid python suffixes for __init__.py?
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# this includes .py, .pyc, and .pyo (depending on if we are running -O)
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# but it doesn't include compiled modules (.so, .dll, etc)
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valid_suffixes = [suffix for suffix, mod_type, flags in imp.get_suffixes()
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if flags in (imp.PY_SOURCE, imp.PY_COMPILED)]
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package_entries = ['__init__'+suffix for suffix in valid_suffixes]
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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 = osutils.pathjoin(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(osutils.pathjoin(path, entry)):
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else: # This directory is not a package
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for suffix_info in imp.get_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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if getattr(plugins, f, None):
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mutter('Plugin name %s already loaded', f)
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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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setattr(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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except KeyboardInterrupt:
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## import pdb; pdb.set_trace()
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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
