author | Todd Larsen <tlarsen@google.com> |
Mon, 10 Nov 2008 18:00:47 +0000 | |
changeset 467 | 07441582717a |
parent 323 | ff1a9aa48cfd |
permissions | -rw-r--r-- |
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import os |
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import sys |
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from optparse import OptionParser |
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import imp |
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import django |
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from django.core.management.base import BaseCommand, CommandError, handle_default_options |
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# For backwards compatibility: get_version() used to be in this module. |
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get_version = django.get_version |
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# A cache of loaded commands, so that call_command |
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# doesn't have to reload every time it's called. |
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_commands = None |
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def find_commands(management_dir): |
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""" |
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Given a path to a management directory, returns a list of all the command |
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names that are available. |
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Returns an empty list if no commands are defined. |
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""" |
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command_dir = os.path.join(management_dir, 'commands') |
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try: |
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return [f[:-3] for f in os.listdir(command_dir) |
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if not f.startswith('_') and f.endswith('.py')] |
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except OSError: |
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return [] |
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def find_management_module(app_name): |
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""" |
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Determines the path to the management module for the given app_name, |
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without actually importing the application or the management module. |
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Raises ImportError if the management module cannot be found for any reason. |
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""" |
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parts = app_name.split('.') |
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parts.append('management') |
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parts.reverse() |
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part = parts.pop() |
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path = None |
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# When using manage.py, the project module is added to the path, |
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# loaded, then removed from the path. This means that |
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# testproject.testapp.models can be loaded in future, even if |
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# testproject isn't in the path. When looking for the management |
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# module, we need look for the case where the project name is part |
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# of the app_name but the project directory itself isn't on the path. |
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try: |
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f, path, descr = imp.find_module(part,path) |
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except ImportError,e: |
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if os.path.basename(os.getcwd()) != part: |
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raise e |
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while parts: |
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part = parts.pop() |
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f, path, descr = imp.find_module(part, path and [path] or None) |
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return path |
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def load_command_class(app_name, name): |
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""" |
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Given a command name and an application name, returns the Command |
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class instance. All errors raised by the import process |
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(ImportError, AttributeError) are allowed to propagate. |
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""" |
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return getattr(__import__('%s.management.commands.%s' % (app_name, name), |
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{}, {}, ['Command']), 'Command')() |
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def get_commands(): |
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""" |
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Returns a dictionary mapping command names to their callback applications. |
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|
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This works by looking for a management.commands package in django.core, and |
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in each installed application -- if a commands package exists, all commands |
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in that package are registered. |
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|
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Core commands are always included. If a settings module has been |
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specified, user-defined commands will also be included, the |
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startproject command will be disabled, and the startapp command |
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will be modified to use the directory in which the settings module appears. |
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The dictionary is in the format {command_name: app_name}. Key-value |
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pairs from this dictionary can then be used in calls to |
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load_command_class(app_name, command_name) |
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|
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If a specific version of a command must be loaded (e.g., with the |
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startapp command), the instantiated module can be placed in the |
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dictionary in place of the application name. |
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|
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The dictionary is cached on the first call and reused on subsequent |
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calls. |
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""" |
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global _commands |
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if _commands is None: |
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_commands = dict([(name, 'django.core') for name in find_commands(__path__[0])]) |
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# Find the installed apps |
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try: |
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from django.conf import settings |
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apps = settings.INSTALLED_APPS |
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101 |
except (AttributeError, EnvironmentError, ImportError): |
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apps = [] |
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103 |
|
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# Find the project directory |
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try: |
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from django.conf import settings |
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project_directory = setup_environ( |
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__import__( |
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settings.SETTINGS_MODULE, {}, {}, |
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(settings.SETTINGS_MODULE.split(".")[-1],) |
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), settings.SETTINGS_MODULE |
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112 |
) |
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|
113 |
except (AttributeError, EnvironmentError, ImportError): |
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Load ../vendor/django into trunk/app/django.
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parents:
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|
114 |
project_directory = None |
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parents:
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|
115 |
|
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parents:
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|
116 |
# Find and load the management module for each installed app. |
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|
117 |
for app_name in apps: |
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|
118 |
try: |
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|
119 |
path = find_management_module(app_name) |
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|
120 |
_commands.update(dict([(name, app_name) |
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|
121 |
for name in find_commands(path)])) |
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parents:
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|
122 |
except ImportError: |
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Load ../vendor/django into trunk/app/django.
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parents:
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|
123 |
pass # No management module - ignore this app |
54
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|
124 |
|
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|
125 |
if project_directory: |
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parents:
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|
126 |
# Remove the "startproject" command from self.commands, because |
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|
127 |
# that's a django-admin.py command, not a manage.py command. |
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parents:
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|
128 |
del _commands['startproject'] |
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|
129 |
|
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parents:
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|
130 |
# Override the startapp command so that it always uses the |
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parents:
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|
131 |
# project_directory, not the current working directory |
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|
132 |
# (which is default). |
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133 |
from django.core.management.commands.startapp import ProjectCommand |
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|
134 |
_commands['startapp'] = ProjectCommand(project_directory) |
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|
135 |
|
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|
136 |
return _commands |
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137 |
|
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|
138 |
def call_command(name, *args, **options): |
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|
139 |
""" |
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|
140 |
Calls the given command, with the given options and args/kwargs. |
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|
141 |
|
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|
142 |
This is the primary API you should use for calling specific commands. |
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|
143 |
|
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|
144 |
Some examples: |
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|
145 |
call_command('syncdb') |
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|
146 |
call_command('shell', plain=True) |
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|
147 |
call_command('sqlall', 'myapp') |
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|
148 |
""" |
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|
149 |
try: |
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|
150 |
app_name = get_commands()[name] |
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|
151 |
if isinstance(app_name, BaseCommand): |
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|
152 |
# If the command is already loaded, use it directly. |
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|
153 |
klass = app_name |
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|
154 |
else: |
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|
155 |
klass = load_command_class(app_name, name) |
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|
156 |
except KeyError: |
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157 |
raise CommandError, "Unknown command: %r" % name |
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|
158 |
return klass.execute(*args, **options) |
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|
159 |
|
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|
160 |
class LaxOptionParser(OptionParser): |
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|
161 |
""" |
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|
162 |
An option parser that doesn't raise any errors on unknown options. |
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|
163 |
|
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|
164 |
This is needed because the --settings and --pythonpath options affect |
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|
165 |
the commands (and thus the options) that are available to the user. |
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|
166 |
""" |
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|
167 |
def error(self, msg): |
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|
168 |
pass |
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|
169 |
|
323
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|
170 |
def print_help(self): |
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|
171 |
"""Output nothing. |
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|
172 |
|
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|
173 |
The lax options are included in the normal option parser, so under |
ff1a9aa48cfd
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|
174 |
normal usage, we don't need to print the lax options. |
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|
175 |
""" |
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|
176 |
pass |
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|
177 |
|
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changeset
|
178 |
def print_lax_help(self): |
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|
179 |
"""Output the basic options available to every command. |
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|
180 |
|
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|
181 |
This just redirects to the default print_help() behaviour. |
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|
182 |
""" |
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changeset
|
183 |
OptionParser.print_help(self) |
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|
184 |
|
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|
185 |
def _process_args(self, largs, rargs, values): |
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|
186 |
""" |
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changeset
|
187 |
Overrides OptionParser._process_args to exclusively handle default |
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parents:
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changeset
|
188 |
options and ignore args and other options. |
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parents:
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changeset
|
189 |
|
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changeset
|
190 |
This overrides the behavior of the super class, which stop parsing |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
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parents:
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changeset
|
191 |
at the first unrecognized option. |
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changeset
|
192 |
""" |
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changeset
|
193 |
while rargs: |
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|
194 |
arg = rargs[0] |
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|
195 |
try: |
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changeset
|
196 |
if arg[0:2] == "--" and len(arg) > 2: |
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changeset
|
197 |
# process a single long option (possibly with value(s)) |
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changeset
|
198 |
# the superclass code pops the arg off rargs |
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changeset
|
199 |
self._process_long_opt(rargs, values) |
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changeset
|
200 |
elif arg[:1] == "-" and len(arg) > 1: |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
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parents:
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diff
changeset
|
201 |
# process a cluster of short options (possibly with |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
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changeset
|
202 |
# value(s) for the last one only) |
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changeset
|
203 |
# the superclass code pops the arg off rargs |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
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changeset
|
204 |
self._process_short_opts(rargs, values) |
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Load ../vendor/django into trunk/app/django.
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changeset
|
205 |
else: |
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Load ../vendor/django into trunk/app/django.
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parents:
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diff
changeset
|
206 |
# it's either a non-default option or an arg |
ff1a9aa48cfd
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changeset
|
207 |
# either way, add it to the args list so we can keep |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
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changeset
|
208 |
# dealing with options |
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changeset
|
209 |
del rargs[0] |
ff1a9aa48cfd
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changeset
|
210 |
raise error |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
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diff
changeset
|
211 |
except: |
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Load ../vendor/django into trunk/app/django.
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parents:
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diff
changeset
|
212 |
largs.append(arg) |
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Load ../vendor/django into trunk/app/django.
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diff
changeset
|
213 |
|
54
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|
214 |
class ManagementUtility(object): |
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Major reorganization of the soc svn repo, to merge into a single App Engine
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changeset
|
215 |
""" |
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Major reorganization of the soc svn repo, to merge into a single App Engine
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parents:
diff
changeset
|
216 |
Encapsulates the logic of the django-admin.py and manage.py utilities. |
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Major reorganization of the soc svn repo, to merge into a single App Engine
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parents:
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changeset
|
217 |
|
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parents:
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changeset
|
218 |
A ManagementUtility has a number of commands, which can be manipulated |
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Major reorganization of the soc svn repo, to merge into a single App Engine
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|
219 |
by editing the self.commands dictionary. |
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Major reorganization of the soc svn repo, to merge into a single App Engine
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|
220 |
""" |
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Major reorganization of the soc svn repo, to merge into a single App Engine
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parents:
diff
changeset
|
221 |
def __init__(self, argv=None): |
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Major reorganization of the soc svn repo, to merge into a single App Engine
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parents:
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|
222 |
self.argv = argv or sys.argv[:] |
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Major reorganization of the soc svn repo, to merge into a single App Engine
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parents:
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|
223 |
self.prog_name = os.path.basename(self.argv[0]) |
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Major reorganization of the soc svn repo, to merge into a single App Engine
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parents:
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changeset
|
224 |
|
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def main_help_text(self): |
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""" |
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Returns the script's main help text, as a string. |
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""" |
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usage = ['',"Type '%s help <subcommand>' for help on a specific subcommand." % self.prog_name,''] |
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usage.append('Available subcommands:') |
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commands = get_commands().keys() |
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commands.sort() |
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for cmd in commands: |
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usage.append(' %s' % cmd) |
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return '\n'.join(usage) |
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236 |
|
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def fetch_command(self, subcommand): |
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""" |
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Tries to fetch the given subcommand, printing a message with the |
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appropriate command called from the command line (usually |
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"django-admin.py" or "manage.py") if it can't be found. |
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""" |
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try: |
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app_name = get_commands()[subcommand] |
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if isinstance(app_name, BaseCommand): |
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# If the command is already loaded, use it directly. |
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klass = app_name |
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else: |
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klass = load_command_class(app_name, subcommand) |
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except KeyError: |
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sys.stderr.write("Unknown command: %r\nType '%s help' for usage.\n" % \ |
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(subcommand, self.prog_name)) |
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sys.exit(1) |
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return klass |
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255 |
|
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def execute(self): |
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""" |
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Given the command-line arguments, this figures out which subcommand is |
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being run, creates a parser appropriate to that command, and runs it. |
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""" |
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# Preprocess options to extract --settings and --pythonpath. |
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# These options could affect the commands that are available, so they |
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# must be processed early. |
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parser = LaxOptionParser(usage="%prog subcommand [options] [args]", |
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version=get_version(), |
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option_list=BaseCommand.option_list) |
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try: |
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options, args = parser.parse_args(self.argv) |
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handle_default_options(options) |
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except: |
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pass # Ignore any option errors at this point. |
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272 |
|
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try: |
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subcommand = self.argv[1] |
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except IndexError: |
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sys.stderr.write("Type '%s help' for usage.\n" % self.prog_name) |
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sys.exit(1) |
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278 |
|
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if subcommand == 'help': |
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if len(args) > 2: |
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self.fetch_command(args[2]).print_help(self.prog_name, args[2]) |
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else: |
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parser.print_lax_help() |
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sys.stderr.write(self.main_help_text() + '\n') |
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sys.exit(1) |
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# Special-cases: We want 'django-admin.py --version' and |
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# 'django-admin.py --help' to work, for backwards compatibility. |
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elif self.argv[1:] == ['--version']: |
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# LaxOptionParser already takes care of printing the version. |
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pass |
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elif self.argv[1:] == ['--help']: |
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parser.print_lax_help() |
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sys.stderr.write(self.main_help_text() + '\n') |
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294 |
else: |
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self.fetch_command(subcommand).run_from_argv(self.argv) |
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296 |
|
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def setup_environ(settings_mod, original_settings_path=None): |
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""" |
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Configures the runtime environment. This can also be used by external |
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scripts wanting to set up a similar environment to manage.py. |
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Returns the project directory (assuming the passed settings module is |
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directly in the project directory). |
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303 |
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The "original_settings_path" parameter is optional, but recommended, since |
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trying to work out the original path from the module can be problematic. |
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""" |
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# Add this project to sys.path so that it's importable in the conventional |
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# way. For example, if this file (manage.py) lives in a directory |
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# "myproject", this code would add "/path/to/myproject" to sys.path. |
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project_directory, settings_filename = os.path.split(settings_mod.__file__) |
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if project_directory == os.curdir or not project_directory: |
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project_directory = os.getcwd() |
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project_name = os.path.basename(project_directory) |
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settings_name = os.path.splitext(settings_filename)[0] |
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sys.path.append(os.path.join(project_directory, os.pardir)) |
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project_module = __import__(project_name, {}, {}, ['']) |
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sys.path.pop() |
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318 |
|
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# Set DJANGO_SETTINGS_MODULE appropriately. |
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if original_settings_path: |
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os.environ['DJANGO_SETTINGS_MODULE'] = original_settings_path |
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else: |
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os.environ['DJANGO_SETTINGS_MODULE'] = '%s.%s' % (project_name, settings_name) |
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return project_directory |
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325 |
|
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326 |
def execute_from_command_line(argv=None): |
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""" |
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A simple method that runs a ManagementUtility. |
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""" |
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utility = ManagementUtility(argv) |
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utility.execute() |
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332 |
|
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333 |
def execute_manager(settings_mod, argv=None): |
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334 |
""" |
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Like execute_from_command_line(), but for use by manage.py, a |
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project-specific django-admin.py utility. |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
337 |
""" |
323
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
54
diff
changeset
|
338 |
setup_environ(settings_mod) |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
54
diff
changeset
|
339 |
utility = ManagementUtility(argv) |
54
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
340 |
utility.execute() |