1
# Copyright (C) 2004, 2005 by Canonical Ltd
3
# This program is free software; you can redistribute it and/or modify
4
# it under the terms of the GNU General Public License as published by
5
# the Free Software Foundation; either version 2 of the License, or
6
# (at your option) any later version.
8
# This program is distributed in the hope that it will be useful,
9
# but WITHOUT ANY WARRANTY; without even the implied warranty of
10
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11
# GNU General Public License for more details.
13
# You should have received a copy of the GNU General Public License
14
# along with this program; if not, write to the Free Software
15
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18
"""bzr python plugin support
20
Any python module in $BZR_PLUGIN_PATH will be imported upon initialization of
21
bzrlib. The module will be imported as 'bzrlib.plugins.$BASENAME(PLUGIN)'.
22
In the plugin's main body, it should update any bzrlib registries it wants to
23
extend; for example, to add new commands, import bzrlib.commands and add your
24
new command to the plugin_cmds variable.
27
# TODO: Refactor this to make it more testable. The main problem at the
28
# moment is that loading plugins affects the global process state -- for bzr
29
# in general use it's a reasonable assumption that all plugins are loaded at
30
# startup and then stay loaded, but this is less good for testing.
32
# Several specific issues:
33
# - plugins can't be unloaded and will continue to effect later tests
34
# - load_plugins does nothing if called a second time
35
# - plugin hooks can't be removed
37
# Our options are either to remove these restrictions, or work around them by
38
# loading the plugins into a different space than the one running the tests.
39
# That could be either a separate Python interpreter or perhaps a new
40
# namespace inside this interpreter.
48
from bzrlib.config import config_dir
49
from bzrlib.trace import log_error, mutter, warning, \
51
from bzrlib.errors import BzrError
52
from bzrlib import plugins
53
from bzrlib.osutils import pathjoin
55
DEFAULT_PLUGIN_PATH = pathjoin(config_dir(), 'plugins')
61
"""Return a dictionary of the plugins."""
63
for name, plugin in bzrlib.plugins.__dict__.items():
64
if isinstance(plugin, types.ModuleType):
69
def disable_plugins():
70
"""Disable loading plugins.
72
Future calls to load_plugins() will be ignored.
74
# TODO: jam 20060131 This should probably also disable
81
"""Load bzrlib plugins.
83
The environment variable BZR_PLUGIN_PATH is considered a delimited
84
set of paths to look through. Each entry is searched for *.py
85
files (and whatever other extensions are used in the platform,
88
load_from_dirs() provides the underlying mechanism and is called with
89
the default directory list to provide the normal behaviour.
93
# People can make sure plugins are loaded, they just won't be twice
95
#raise BzrError("plugins already initialized")
98
dirs = os.environ.get('BZR_PLUGIN_PATH', DEFAULT_PLUGIN_PATH).split(os.pathsep)
99
dirs.insert(0, os.path.dirname(plugins.__file__))
104
def load_from_dirs(dirs):
105
"""Load bzrlib plugins found in each dir in dirs.
107
Loading a plugin means importing it into the python interpreter.
108
The plugin is expected to make calls to register commands when
109
it's loaded (or perhaps access other hooks in future.)
111
Plugins are loaded into bzrlib.plugins.NAME, and can be found there
112
for future reference.
114
# Get the list of valid python suffixes for __init__.py?
115
# this includes .py, .pyc, and .pyo (depending on if we are running -O)
116
# but it doesn't include compiled modules (.so, .dll, etc)
117
valid_suffixes = [suffix for suffix, mod_type, flags in imp.get_suffixes()
118
if flags in (imp.PY_SOURCE, imp.PY_COMPILED)]
119
package_entries = ['__init__'+suffix for suffix in valid_suffixes]
123
mutter('looking for plugins in %s', d)
125
if not os.path.isdir(d):
127
for f in os.listdir(d):
128
path = pathjoin(d, f)
129
if os.path.isdir(path):
130
for entry in package_entries:
131
# This directory should be a package, and thus added to
133
if os.path.isfile(pathjoin(path, entry)):
135
else: # This directory is not a package
138
for suffix_info in imp.get_suffixes():
139
if f.endswith(suffix_info[0]):
140
f = f[:-len(suffix_info[0])]
141
if suffix_info[2] == imp.C_EXTENSION and f.endswith('module'):
142
f = f[:-len('module')]
146
if getattr(bzrlib.plugins, f, None):
147
mutter('Plugin name %s already loaded', f)
149
mutter('add plugin name %s', f)
152
plugin_names = list(plugin_names)
154
for name in plugin_names:
156
plugin_info = imp.find_module(name, [d])
157
mutter('load plugin %r', plugin_info)
159
plugin = imp.load_module('bzrlib.plugins.' + name,
161
setattr(bzrlib.plugins, name, plugin)
163
if plugin_info[0] is not None:
164
plugin_info[0].close()
166
mutter('loaded succesfully')
167
except KeyboardInterrupt:
170
## import pdb; pdb.set_trace()
171
warning('Unable to load plugin %r from %r' % (name, d))
172
log_exception_quietly()
added
removed
bzrlib/plugin.py
