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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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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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"""bzr python plugin support.
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When load_plugins() is invoked, any python module in any directory in
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$BZR_PLUGIN_PATH will be imported. The module will be imported as
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'bzrlib.plugins.$BASENAME(PLUGIN)'. 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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update any bzrlib registries it wants to extend.
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See the plugin-api developer documentation for information about writing
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BZR_PLUGIN_PATH is also honoured for any plugins imported via
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'import bzrlib.plugins.PLUGINNAME', as long as set_plugins_path has been
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'import bzrlib.plugins.PLUGINNAME', as long as set_plugins_path has been
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from __future__ import absolute_import
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from bzrlib import osutils
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from bzrlib.lazy_import import lazy_import
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lazy_import(globals(), """
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from bzrlib import (
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_format_version_tuple,
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from bzrlib.i18n import gettext
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from bzrlib import plugins as _mod_plugins
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from bzrlib.symbol_versioning import deprecated_function, zero_ninetyone
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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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@deprecated_function(zero_ninetyone)
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"""Return a dictionary of the plugins."""
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return dict((name, plugin.module) for name, plugin in plugins().items())
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_plugins_disabled = False
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# Map from plugin name, to list of string warnings about eg plugin
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def are_plugins_disabled():
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return _plugins_disabled
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def disable_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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global _plugins_disabled
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_plugins_disabled = True
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def describe_plugins(show_paths=False):
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"""Generate text description of plugins.
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Includes both those that have loaded, and those that failed to
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:param show_paths: If true,
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:returns: Iterator of text lines (including newlines.)
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from inspect import getdoc
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loaded_plugins = plugins()
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all_names = sorted(list(set(
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loaded_plugins.keys() + plugin_warnings.keys())))
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for name in all_names:
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if name in loaded_plugins:
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plugin = loaded_plugins[name]
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version = plugin.__version__
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if version == 'unknown':
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yield '%s %s\n' % (name, version)
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d = getdoc(plugin.module)
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doc = d.split('\n')[0]
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doc = '(no description)'
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yield (" %s\n" % doc)
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yield (" %s\n" % plugin.path())
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yield "%s (failed to load)\n" % name
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if name in plugin_warnings:
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for line in plugin_warnings[name]:
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yield " ** " + line + '\n'
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def _strip_trailing_sep(path):
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return path.rstrip("\\/")
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def set_plugins_path():
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"""Set the path for plugins to be loaded from."""
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path = os.environ.get('BZR_PLUGIN_PATH',
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get_default_plugin_path()).split(os.pathsep)
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def _get_specific_plugin_paths(paths):
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"""Returns the plugin paths from a string describing the associations.
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:param paths: A string describing the paths associated with the plugins.
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:returns: A list of (plugin name, path) tuples.
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For example, if paths is my_plugin@/test/my-test:her_plugin@/production/her,
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[('my_plugin', '/test/my-test'), ('her_plugin', '/production/her')]
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Note that ':' in the example above depends on the os.
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for spec in paths.split(os.pathsep):
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name, path = spec.split('@')
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raise errors.BzrCommandError(gettext(
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'"%s" is not a valid <plugin_name>@<plugin_path> description ')
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specs.append((name, path))
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def set_plugins_path(path=None):
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"""Set the path for plugins to be loaded from.
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:param path: The list of paths to search for plugins. By default,
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path will be determined using get_standard_plugins_path.
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if path is [], no plugins can be loaded.
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path = get_standard_plugins_path()
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_mod_plugins.__path__ = path
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PluginImporter.reset()
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# Set up a blacklist for disabled plugins
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disabled_plugins = os.environ.get('BZR_DISABLE_PLUGINS', None)
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if disabled_plugins is not None:
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for name in disabled_plugins.split(os.pathsep):
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PluginImporter.blacklist.add('bzrlib.plugins.' + name)
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# Set up a the specific paths for plugins
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for plugin_name, plugin_path in _get_specific_plugin_paths(os.environ.get(
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'BZR_PLUGINS_AT', None)):
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PluginImporter.specific_paths[
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'bzrlib.plugins.%s' % plugin_name] = plugin_path
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def _append_new_path(paths, new_path):
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"""Append a new path if it set and not already known."""
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if new_path is not None and new_path not in paths:
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paths.append(new_path)
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def get_core_plugin_path():
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bzr_exe = bool(getattr(sys, 'frozen', None))
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if bzr_exe: # expand path for bzr.exe
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# We need to use relative path to system-wide plugin
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# directory because bzrlib from standalone bzr.exe
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# could be imported by another standalone program
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# (e.g. bzr-config; or TortoiseBzr/Olive if/when they
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# will become standalone exe). [bialix 20071123]
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# __file__ typically is
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# C:\Program Files\Bazaar\lib\library.zip\bzrlib\plugin.pyc
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# then plugins directory is
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# C:\Program Files\Bazaar\plugins
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# so relative path is ../../../plugins
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core_path = osutils.abspath(osutils.pathjoin(
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osutils.dirname(__file__), '../../../plugins'))
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else: # don't look inside library.zip
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# search the plugin path before the bzrlib installed dir
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core_path = os.path.dirname(_mod_plugins.__file__)
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def get_site_plugin_path():
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"""Returns the path for the site installed plugins."""
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if sys.platform == 'win32':
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# We don't have (yet) a good answer for windows since that is certainly
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# related to the way we build the installers. -- vila20090821
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from distutils.sysconfig import get_python_lib
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# If distutuils is not available, we just don't know where they are
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site_path = osutils.pathjoin(get_python_lib(), 'bzrlib', 'plugins')
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def get_user_plugin_path():
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return osutils.pathjoin(config.config_dir(), 'plugins')
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def get_standard_plugins_path():
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"""Determine a plugin path suitable for general use."""
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# Ad-Hoc default: core is not overriden by site but user can overrides both
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# The rationale is that:
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# - 'site' comes last, because these plugins should always be available and
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# are supposed to be in sync with the bzr installed on site.
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# - 'core' comes before 'site' so that running bzr from sources or a user
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# installed version overrides the site version.
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# - 'user' comes first, because... user is always right.
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# - the above rules clearly defines which plugin version will be loaded if
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# several exist. Yet, it is sometimes desirable to disable some directory
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# so that a set of plugins is disabled as once. This can be done via
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# -site, -core, -user.
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env_paths = os.environ.get('BZR_PLUGIN_PATH', '+user').split(os.pathsep)
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defaults = ['+core', '+site']
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# The predefined references
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refs = dict(core=get_core_plugin_path(),
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site=get_site_plugin_path(),
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user=get_user_plugin_path())
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# Unset paths that should be removed
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for k,v in refs.iteritems():
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# defaults can never mention removing paths as that will make it
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# impossible for the user to revoke these removals.
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if removed in env_paths:
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env_paths.remove(removed)
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for p in env_paths + defaults:
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if p.startswith('+'):
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# Resolve references if they are known
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# Leave them untouched so user can still use paths starting
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_append_new_path(paths, p)
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# Get rid of trailing slashes, since Python can't handle them when
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# it tries to import modules.
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path = map(_strip_trailing_sep, path)
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# search the plugin path before the bzrlib installed dir
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path.append(os.path.dirname(_mod_plugins.__file__))
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_mod_plugins.__path__ = path
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paths = map(_strip_trailing_sep, paths)
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def load_plugins(path=None):
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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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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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load_from_path() 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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:param path: The list of paths to search for plugins. By default,
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path will be determined using get_standard_plugins_path.
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if path is [], no plugins can be loaded.
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load_from_dirs = load_from_path
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def _find_plugin_module(dir, name):
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"""Check if there is a valid python module that can be loaded as a plugin.
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:param dir: The directory where the search is performed.
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:param path: An existing file path, either a python file or a package
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:return: (name, path, description) name is the module name, path is the
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file to load and description is the tuple returned by
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path = osutils.pathjoin(dir, name)
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if os.path.isdir(path):
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# Check for a valid __init__.py file, valid suffixes depends on -O and
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# can be .py, .pyc and .pyo
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for suffix, mode, kind in imp.get_suffixes():
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if kind not in (imp.PY_SOURCE, imp.PY_COMPILED):
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# We don't recognize compiled modules (.so, .dll, etc)
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init_path = osutils.pathjoin(path, '__init__' + suffix)
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if os.path.isfile(init_path):
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return name, init_path, (suffix, mode, kind)
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for suffix, mode, kind in imp.get_suffixes():
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if name.endswith(suffix):
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# Clean up the module name
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name = name[:-len(suffix)]
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if kind == imp.C_EXTENSION and name.endswith('module'):
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name = name[:-len('module')]
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return name, path, (suffix, mode, kind)
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# There is no python module here
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return None, None, (None, None, None)
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def record_plugin_warning(plugin_name, warning_message):
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trace.mutter(warning_message)
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plugin_warnings.setdefault(plugin_name, []).append(warning_message)
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def _load_plugin_module(name, dir):
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"""Load plugin name from dir.
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:param name: The plugin name in the bzrlib.plugins namespace.
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:param dir: The directory the plugin is loaded from for error messages.
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if ('bzrlib.plugins.%s' % name) in PluginImporter.blacklist:
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exec "import bzrlib.plugins.%s" % name in {}
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except KeyboardInterrupt:
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except errors.IncompatibleAPI, e:
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"Unable to load plugin %r. It requested API version "
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"%s of module %s but the minimum exported version is %s, and "
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"the maximum is %s" %
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(name, e.wanted, e.api, e.minimum, e.current))
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record_plugin_warning(name, warning_message)
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trace.warning("%s" % e)
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if re.search('\.|-| ', name):
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sanitised_name = re.sub('[-. ]', '_', name)
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if sanitised_name.startswith('bzr_'):
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sanitised_name = sanitised_name[len('bzr_'):]
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trace.warning("Unable to load %r in %r as a plugin because the "
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"file path isn't a valid module name; try renaming "
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"it to %r." % (name, dir, sanitised_name))
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record_plugin_warning(
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'Unable to load plugin %r from %r' % (name, dir))
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trace.log_exception_quietly()
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if 'error' in debug.debug_flags:
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trace.print_exception(sys.exc_info(), sys.stderr)
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def load_from_dir(d):
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"""Load the plugins in directory d."""
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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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"""Load the plugins in directory d.
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d must be in the plugins module path already.
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This function is called once for each directory in the module path.
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plugin_names = set()
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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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for p in os.listdir(d):
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name, path, desc = _find_plugin_module(d, p)
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if name == '__init__':
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# We do nothing with the __init__.py file in directories from
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# the bzrlib.plugins module path, we may want to, one day
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continue # We don't load __init__.py in the plugins dirs
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elif getattr(_mod_plugins, name, None) is not None:
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# The module has already been loaded from another directory
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# during a previous call.
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# FIXME: There should be a better way to report masked plugins
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trace.mutter('Plugin name %s already loaded', name)
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if getattr(_mod_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.add(name)
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for name in plugin_names:
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exec "import bzrlib.plugins.%s" % name in {}
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except KeyboardInterrupt:
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## import pdb; pdb.set_trace()
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if re.search('\.|-| ', name):
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warning('Unable to load plugin %r from %r: '
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'It is not a valid python module name.' % (name, d))
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warning('Unable to load plugin %r from %r' % (name, d))
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log_exception_quietly()
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def load_from_zip(zip_name):
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"""Load all the plugins in a zip."""
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valid_suffixes = ('.py', '.pyc', '.pyo') # only python modules/packages
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index = zip_name.rindex('.zip')
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archive = zip_name[:index+4]
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prefix = zip_name[index+5:]
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mutter('Looking for plugins in %r', zip_name)
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# use zipfile to get list of files/dirs inside zip
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z = zipfile.ZipFile(archive)
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namelist = z.namelist()
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except zipfile.error:
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prefix = prefix.replace('\\','/')
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if prefix[-1] != '/':
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namelist = [name[ix:]
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if name.startswith(prefix)]
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mutter('Names in archive: %r', namelist)
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for name in namelist:
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if not name or name.endswith('/'):
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# '/' is used to separate pathname components inside zip archives
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head, tail = '', name
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head, tail = name.rsplit('/',1)
246
# we don't need looking in subdirectories
249
base, suffix = osutils.splitext(tail)
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if suffix not in valid_suffixes:
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if base == '__init__':
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if getattr(_mod_plugins, plugin_name, None):
265
mutter('Plugin name %s already loaded', plugin_name)
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exec "import bzrlib.plugins.%s" % plugin_name in {}
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mutter('Load plugin %s from zip %r', plugin_name, zip_name)
271
except KeyboardInterrupt:
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## import pdb; pdb.set_trace()
275
warning('Unable to load plugin %r from %r'
277
log_exception_quietly()
435
_load_plugin_module(name, d)
281
439
"""Return a dictionary of the plugins.
283
441
Each item in the dictionary is a PlugIn object.
559
def load_plugin_tests(self, loader):
560
"""Return the adapted plugin's test suite.
562
:param loader: The custom loader that should be used to load additional
566
if getattr(self.module, 'load_tests', None) is not None:
567
return loader.loadTestsFromModule(self.module)
394
571
def version_info(self):
395
572
"""Return the plugin's version_tuple or None if unknown."""
396
573
version_info = getattr(self.module, 'version_info', None)
397
if version_info is not None and len(version_info) == 3:
398
version_info = tuple(version_info) + ('final', 0)
574
if version_info is not None:
576
if isinstance(version_info, types.StringType):
577
version_info = version_info.split('.')
578
elif len(version_info) == 3:
579
version_info = tuple(version_info) + ('final', 0)
581
# The given version_info isn't even iteratible
582
trace.log_exception_quietly()
583
version_info = (version_info,)
399
584
return version_info
401
586
def _get__version__(self):
402
587
version_info = self.version_info()
403
if version_info is None:
588
if version_info is None or len(version_info) == 0:
405
if version_info[3] == 'final':
406
version_string = '%d.%d.%d' % version_info[:3]
408
version_string = '%d.%d.%d%s%d' % version_info
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version_string = _format_version_tuple(version_info)
592
except (ValueError, TypeError, IndexError), e:
593
trace.log_exception_quietly()
594
# try to return something usefull for bad plugins, in stead of
596
version_string = '.'.join(map(str, version_info))
409
597
return version_string
411
599
__version__ = property(_get__version__)
602
class _PluginImporter(object):
603
"""An importer tailored to bzr specific needs.
605
This is a singleton that takes care of:
606
- disabled plugins specified in 'blacklist',
607
- plugins that needs to be loaded from specific directories.
614
self.blacklist = set()
615
self.specific_paths = {}
617
def find_module(self, fullname, parent_path=None):
618
"""Search a plugin module.
620
Disabled plugins raise an import error, plugins with specific paths
621
returns a specific loader.
623
:return: None if the plugin doesn't need special handling, self
626
if not fullname.startswith('bzrlib.plugins.'):
628
if fullname in self.blacklist:
629
raise ImportError('%s is disabled' % fullname)
630
if fullname in self.specific_paths:
634
def load_module(self, fullname):
635
"""Load a plugin from a specific directory (or file)."""
636
# We are called only for specific paths
637
plugin_path = self.specific_paths[fullname]
639
if os.path.isdir(plugin_path):
640
for suffix, mode, kind in imp.get_suffixes():
641
if kind not in (imp.PY_SOURCE, imp.PY_COMPILED):
642
# We don't recognize compiled modules (.so, .dll, etc)
644
init_path = osutils.pathjoin(plugin_path, '__init__' + suffix)
645
if os.path.isfile(init_path):
646
# We've got a module here and load_module needs specific
648
loading_path = plugin_path
651
kind = imp.PKG_DIRECTORY
654
for suffix, mode, kind in imp.get_suffixes():
655
if plugin_path.endswith(suffix):
656
loading_path = plugin_path
658
if loading_path is None:
659
raise ImportError('%s cannot be loaded from %s'
660
% (fullname, plugin_path))
661
if kind is imp.PKG_DIRECTORY:
664
f = open(loading_path, mode)
666
mod = imp.load_module(fullname, f, loading_path,
667
(suffix, mode, kind))
668
mod.__package__ = fullname
675
# Install a dedicated importer for plugins requiring special handling
676
PluginImporter = _PluginImporter()
677
sys.meta_path.append(PluginImporter)
added
removed
bzrlib/plugin.py
