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