368 lines
15 KiB
Python
368 lines
15 KiB
Python
from __future__ import unicode_literals
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import os
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import pkgutil
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import sys
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from collections import OrderedDict, defaultdict
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from importlib import import_module
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import django
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from django.apps import apps
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from django.conf import settings
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from django.core.exceptions import ImproperlyConfigured
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from django.core.management.base import (
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BaseCommand, CommandError, CommandParser, handle_default_options,
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)
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from django.core.management.color import color_style
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from django.utils import autoreload, lru_cache, six
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from django.utils._os import npath, upath
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from django.utils.encoding import force_text
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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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return [name for _, name, is_pkg in pkgutil.iter_modules([npath(command_dir)])
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if not is_pkg and not name.startswith('_')]
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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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module = import_module('%s.management.commands.%s' % (app_name, name))
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return module.Command()
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@lru_cache.lru_cache(maxsize=None)
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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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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.
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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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commands = {name: 'django.core' for name in find_commands(upath(__path__[0]))}
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if not settings.configured:
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return commands
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for app_config in reversed(list(apps.get_app_configs())):
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path = os.path.join(app_config.path, 'management')
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commands.update({name: app_config.name for name in find_commands(path)})
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return commands
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def call_command(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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This is the primary API you should use for calling specific commands.
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`name` may be a string or a command object. Using a string is preferred
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unless the command object is required for further processing or testing.
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Some examples:
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call_command('migrate')
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call_command('shell', plain=True)
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call_command('sqlmigrate', 'myapp')
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from django.core.management.commands import flush
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cmd = flush.Command()
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call_command(cmd, verbosity=0, interactive=False)
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# Do something with cmd ...
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"""
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if isinstance(command_name, BaseCommand):
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# Command object passed in.
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command = command_name
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command_name = command.__class__.__module__.split('.')[-1]
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else:
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# Load the command object by name.
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try:
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app_name = get_commands()[command_name]
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except KeyError:
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raise CommandError("Unknown command: %r" % command_name)
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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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command = app_name
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else:
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command = load_command_class(app_name, command_name)
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# Simulate argument parsing to get the option defaults (see #10080 for details).
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parser = command.create_parser('', command_name)
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# Use the `dest` option name from the parser option
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opt_mapping = {
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sorted(s_opt.option_strings)[0].lstrip('-').replace('-', '_'): s_opt.dest
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for s_opt in parser._actions if s_opt.option_strings
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}
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arg_options = {opt_mapping.get(key, key): value for key, value in options.items()}
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defaults = parser.parse_args(args=[force_text(a) for a in args])
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defaults = dict(defaults._get_kwargs(), **arg_options)
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# Move positional args out of options to mimic legacy optparse
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args = defaults.pop('args', ())
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if 'skip_checks' not in options:
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defaults['skip_checks'] = True
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return command.execute(*args, **defaults)
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class ManagementUtility(object):
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"""
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Encapsulates the logic of the django-admin and manage.py utilities.
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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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"""
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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.settings_exception = None
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def main_help_text(self, commands_only=False):
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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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if commands_only:
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usage = sorted(get_commands().keys())
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else:
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usage = [
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"",
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"Type '%s help <subcommand>' for help on a specific subcommand." % self.prog_name,
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"",
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"Available subcommands:",
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]
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commands_dict = defaultdict(lambda: [])
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for name, app in six.iteritems(get_commands()):
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if app == 'django.core':
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app = 'django'
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else:
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app = app.rpartition('.')[-1]
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commands_dict[app].append(name)
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style = color_style()
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for app in sorted(commands_dict.keys()):
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usage.append("")
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usage.append(style.NOTICE("[%s]" % app))
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for name in sorted(commands_dict[app]):
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usage.append(" %s" % name)
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# Output an extra note if settings are not properly configured
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if self.settings_exception is not None:
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usage.append(style.NOTICE(
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"Note that only Django core commands are listed "
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"as settings are not properly configured (error: %s)."
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% self.settings_exception))
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return '\n'.join(usage)
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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" or "manage.py") if it can't be found.
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"""
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# Get commands outside of try block to prevent swallowing exceptions
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commands = get_commands()
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try:
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app_name = commands[subcommand]
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except KeyError:
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if os.environ.get('DJANGO_SETTINGS_MODULE'):
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# If `subcommand` is missing due to misconfigured settings, the
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# following line will retrigger an ImproperlyConfigured exception
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# (get_commands() swallows the original one) so the user is
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# informed about it.
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settings.INSTALLED_APPS
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else:
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sys.stderr.write("No Django settings specified.\n")
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sys.stderr.write(
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"Unknown command: %r\nType '%s help' for usage.\n"
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% (subcommand, self.prog_name)
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)
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sys.exit(1)
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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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return klass
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def autocomplete(self):
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"""
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Output completion suggestions for BASH.
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The output of this function is passed to BASH's `COMREPLY` variable and
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treated as completion suggestions. `COMREPLY` expects a space
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separated string as the result.
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The `COMP_WORDS` and `COMP_CWORD` BASH environment variables are used
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to get information about the cli input. Please refer to the BASH
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man-page for more information about this variables.
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Subcommand options are saved as pairs. A pair consists of
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the long option string (e.g. '--exclude') and a boolean
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value indicating if the option requires arguments. When printing to
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stdout, an equal sign is appended to options which require arguments.
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Note: If debugging this function, it is recommended to write the debug
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output in a separate file. Otherwise the debug output will be treated
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and formatted as potential completion suggestions.
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"""
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# Don't complete if user hasn't sourced bash_completion file.
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if 'DJANGO_AUTO_COMPLETE' not in os.environ:
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return
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cwords = os.environ['COMP_WORDS'].split()[1:]
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cword = int(os.environ['COMP_CWORD'])
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try:
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curr = cwords[cword - 1]
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except IndexError:
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curr = ''
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subcommands = list(get_commands()) + ['help']
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options = [('--help', False)]
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# subcommand
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if cword == 1:
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print(' '.join(sorted(filter(lambda x: x.startswith(curr), subcommands))))
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# subcommand options
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# special case: the 'help' subcommand has no options
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elif cwords[0] in subcommands and cwords[0] != 'help':
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subcommand_cls = self.fetch_command(cwords[0])
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# special case: add the names of installed apps to options
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if cwords[0] in ('dumpdata', 'sqlmigrate', 'sqlsequencereset', 'test'):
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try:
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app_configs = apps.get_app_configs()
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# Get the last part of the dotted path as the app name.
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options.extend((app_config.label, 0) for app_config in app_configs)
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except ImportError:
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# Fail silently if DJANGO_SETTINGS_MODULE isn't set. The
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# user will find out once they execute the command.
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pass
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parser = subcommand_cls.create_parser('', cwords[0])
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options.extend(
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(sorted(s_opt.option_strings)[0], s_opt.nargs != 0)
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for s_opt in parser._actions if s_opt.option_strings
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)
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# filter out previously specified options from available options
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prev_opts = [x.split('=')[0] for x in cwords[1:cword - 1]]
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options = [opt for opt in options if opt[0] not in prev_opts]
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# filter options by current input
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options = sorted((k, v) for k, v in options if k.startswith(curr))
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for option in options:
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opt_label = option[0]
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# append '=' to options which require args
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if option[1]:
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opt_label += '='
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print(opt_label)
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# Exit code of the bash completion function is never passed back to
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# the user, so it's safe to always exit with 0.
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# For more details see #25420.
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sys.exit(0)
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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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try:
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subcommand = self.argv[1]
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except IndexError:
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subcommand = 'help' # Display help if no arguments were given.
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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 = CommandParser(None, usage="%(prog)s subcommand [options] [args]", add_help=False)
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parser.add_argument('--settings')
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parser.add_argument('--pythonpath')
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parser.add_argument('args', nargs='*') # catch-all
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try:
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options, args = parser.parse_known_args(self.argv[2:])
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handle_default_options(options)
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except CommandError:
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pass # Ignore any option errors at this point.
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no_settings_commands = [
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'help', 'version', '--help', '--version', '-h',
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'compilemessages', 'makemessages',
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'startapp', 'startproject',
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]
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try:
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settings.INSTALLED_APPS
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except ImproperlyConfigured as exc:
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self.settings_exception = exc
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# A handful of built-in management commands work without settings.
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# Load the default settings -- where INSTALLED_APPS is empty.
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if subcommand in no_settings_commands:
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settings.configure()
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if settings.configured:
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# Start the auto-reloading dev server even if the code is broken.
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# The hardcoded condition is a code smell but we can't rely on a
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# flag on the command class because we haven't located it yet.
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if subcommand == 'runserver' and '--noreload' not in self.argv:
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try:
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autoreload.check_errors(django.setup)()
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except Exception:
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# The exception will be raised later in the child process
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# started by the autoreloader. Pretend it didn't happen by
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# loading an empty list of applications.
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apps.all_models = defaultdict(OrderedDict)
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apps.app_configs = OrderedDict()
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apps.apps_ready = apps.models_ready = apps.ready = True
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# In all other cases, django.setup() is required to succeed.
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else:
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django.setup()
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self.autocomplete()
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if subcommand == 'help':
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if '--commands' in args:
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sys.stdout.write(self.main_help_text(commands_only=True) + '\n')
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elif len(options.args) < 1:
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sys.stdout.write(self.main_help_text() + '\n')
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else:
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self.fetch_command(options.args[0]).print_help(self.prog_name, options.args[0])
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# Special-cases: We want 'django-admin --version' and
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# 'django-admin --help' to work, for backwards compatibility.
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elif subcommand == 'version' or self.argv[1:] == ['--version']:
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sys.stdout.write(django.get_version() + '\n')
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elif self.argv[1:] in (['--help'], ['-h']):
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sys.stdout.write(self.main_help_text() + '\n')
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else:
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self.fetch_command(subcommand).run_from_argv(self.argv)
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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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