1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
|
# 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(":")
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()
|