author | Todd Larsen <tlarsen@google.com> |
Fri, 18 Jul 2008 18:22:23 +0000 | |
changeset 54 | 03e267d67478 |
child 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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from imp import find_module |
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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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path = None |
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while parts: |
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part = parts.pop() |
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f, path, descr = 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(load_user_commands=True, project_directory=None): |
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""" |
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Returns a dictionary mapping command names to their callback applications. |
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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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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 that 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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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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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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|
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if load_user_commands: |
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# Get commands from all installed apps. |
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from django.conf import settings |
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for app_name in settings.INSTALLED_APPS: |
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try: |
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path = find_management_module(app_name) |
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_commands.update(dict([(name, app_name) for name in find_commands(path)])) |
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except ImportError: |
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pass # No management module -- ignore this app. |
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|
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if project_directory: |
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# Remove the "startproject" command from self.commands, because |
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# that's a django-admin.py command, not a manage.py command. |
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del _commands['startproject'] |
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|
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# Override the startapp command so that it always uses the |
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# project_directory, not the current working directory |
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# (which is default). |
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from django.core.management.commands.startapp import ProjectCommand |
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_commands['startapp'] = ProjectCommand(project_directory) |
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|
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return _commands |
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|
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def call_command(name, *args, **options): |
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""" |
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Calls the given command, with the given options and args/kwargs. |
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|
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This is the primary API you should use for calling specific commands. |
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Some examples: |
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call_command('syncdb') |
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call_command('shell', plain=True) |
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call_command('sqlall', 'myapp') |
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""" |
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117 |
try: |
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app_name = get_commands()[name] |
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119 |
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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122 |
else: |
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klass = load_command_class(app_name, name) |
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124 |
except KeyError: |
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raise CommandError, "Unknown command: %r" % name |
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return klass.execute(*args, **options) |
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127 |
|
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class LaxOptionParser(OptionParser): |
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129 |
""" |
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130 |
An option parser that doesn't raise any errors on unknown options. |
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131 |
|
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132 |
This is needed because the --settings and --pythonpath options affect |
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133 |
the commands (and thus the options) that are available to the user. |
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134 |
""" |
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135 |
def error(self, msg): |
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136 |
pass |
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137 |
|
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class ManagementUtility(object): |
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139 |
""" |
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Encapsulates the logic of the django-admin.py and manage.py utilities. |
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141 |
|
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A ManagementUtility has a number of commands, which can be manipulated |
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by editing the self.commands dictionary. |
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144 |
""" |
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def __init__(self, argv=None): |
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self.argv = argv or sys.argv[:] |
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self.prog_name = os.path.basename(self.argv[0]) |
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self.project_directory = None |
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self.user_commands = False |
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150 |
|
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151 |
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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154 |
""" |
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usage = ['%s <subcommand> [options] [args]' % self.prog_name] |
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usage.append('Django command line tool, version %s' % django.get_version()) |
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usage.append("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(self.user_commands, self.project_directory).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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164 |
|
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165 |
def fetch_command(self, subcommand): |
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166 |
""" |
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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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169 |
"django-admin.py" or "manage.py") if it can't be found. |
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170 |
""" |
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171 |
try: |
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172 |
app_name = get_commands(self.user_commands, self.project_directory)[subcommand] |
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173 |
if isinstance(app_name, BaseCommand): |
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174 |
# If the command is already loaded, use it directly. |
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175 |
klass = app_name |
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176 |
else: |
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177 |
klass = load_command_class(app_name, subcommand) |
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178 |
except KeyError: |
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179 |
sys.stderr.write("Unknown command: %r\nType '%s help' for usage.\n" % \ |
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180 |
(subcommand, self.prog_name)) |
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181 |
sys.exit(1) |
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182 |
return klass |
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183 |
|
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184 |
def execute(self): |
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185 |
""" |
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186 |
Given the command-line arguments, this figures out which subcommand is |
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187 |
being run, creates a parser appropriate to that command, and runs it. |
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188 |
""" |
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189 |
# Preprocess options to extract --settings and --pythonpath. |
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190 |
# These options could affect the commands that are available, so they |
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191 |
# must be processed early. |
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192 |
parser = LaxOptionParser(version=get_version(), option_list=BaseCommand.option_list) |
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193 |
try: |
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194 |
options, args = parser.parse_args(self.argv) |
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195 |
handle_default_options(options) |
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196 |
except: |
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197 |
pass # Ignore any option errors at this point. |
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198 |
|
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199 |
try: |
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200 |
subcommand = self.argv[1] |
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201 |
except IndexError: |
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202 |
sys.stderr.write("Type '%s help' for usage.\n" % self.prog_name) |
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203 |
sys.exit(1) |
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204 |
|
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205 |
if subcommand == 'help': |
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206 |
if len(args) > 2: |
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207 |
self.fetch_command(args[2]).print_help(self.prog_name, args[2]) |
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208 |
else: |
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209 |
sys.stderr.write(self.main_help_text() + '\n') |
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210 |
sys.exit(1) |
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211 |
# Special-cases: We want 'django-admin.py --version' and |
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212 |
# 'django-admin.py --help' to work, for backwards compatibility. |
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213 |
elif self.argv[1:] == ['--version']: |
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214 |
# LaxOptionParser already takes care of printing the version. |
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215 |
pass |
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216 |
elif self.argv[1:] == ['--help']: |
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217 |
sys.stderr.write(self.main_help_text() + '\n') |
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218 |
else: |
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219 |
self.fetch_command(subcommand).run_from_argv(self.argv) |
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220 |
|
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221 |
class ProjectManagementUtility(ManagementUtility): |
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222 |
""" |
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223 |
A ManagementUtility that is specific to a particular Django project. |
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224 |
As such, its commands are slightly different than those of its parent |
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225 |
class. |
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226 |
|
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227 |
In practice, this class represents manage.py, whereas ManagementUtility |
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228 |
represents django-admin.py. |
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229 |
""" |
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230 |
def __init__(self, argv, project_directory): |
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231 |
super(ProjectManagementUtility, self).__init__(argv) |
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self.project_directory = project_directory |
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self.user_commands = True |
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|
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def setup_environ(settings_mod): |
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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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""" |
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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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# Set DJANGO_SETTINGS_MODULE appropriately. |
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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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|
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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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|
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def execute_manager(settings_mod, argv=None): |
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""" |
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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. |
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""" |
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project_directory = setup_environ(settings_mod) |
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utility = ProjectManagementUtility(argv, project_directory) |
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utility.execute() |