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Fixed #18387 -- Do not call sys.exit during call_command. 

Moved sys.exit(1) so as failing management commands reach it
only when running from command line.
This commit is contained in:
Claude Paroz 2012-05-26 20:50:44 +02:00
parent 4423757c0c
commit f2b6763ad7
7 changed files with 56 additions and 44 deletions
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13
django/contrib/auth/tests/management.py
View File

@ -2,6 +2,7 @@ from StringIO import StringIO
from django.contrib.auth import models, management
from django.contrib.auth.management.commands import changepassword
from django.core.management.base import CommandError
from django.test import TestCase
@ -56,16 +57,10 @@ class ChangepasswordManagementCommandTestCase(TestCase):
def test_that_max_tries_exits_1(self):
"""
A CommandError should be thrown by handle() if the user enters in
mismatched passwords three times. This should be caught by execute() and
converted to a SystemExit
mismatched passwords three times.
"""
command = changepassword.Command()
command._get_pass = lambda *args: args or 'foo'
self.assertRaises(
SystemExit,
command.execute,
"joe",
stdout=self.stdout,
stderr=self.stderr
)
with self.assertRaises(CommandError):
command.execute("joe", stdout=self.stdout, stderr=self.stderr)

36
django/core/management/base.py
View File

@ -97,8 +97,9 @@ class BaseCommand(object):
output and, if the command is intended to produce a block of
SQL statements, will be wrapped in ``BEGIN`` and ``COMMIT``.
4. If ``handle()`` raised a ``CommandError``, ``execute()`` will
instead print an error message to ``stderr``.
4. If ``handle()`` or ``execute()`` raised any exception (e.g.
``CommandError``), ``run_from_argv()`` will instead print an error
message to ``stderr``.
Thus, the ``handle()`` method is typically the starting point for
subclasses; many built-in commands and command types either place
@ -210,23 +211,27 @@ class BaseCommand(object):
def run_from_argv(self, argv):
"""
Set up any environment changes requested (e.g., Python path
and Django settings), then run this command.
and Django settings), then run this command. If the
command raises a ``CommandError``, intercept it and print it sensibly
to stderr.
"""
parser = self.create_parser(argv[0], argv[1])
options, args = parser.parse_args(argv[2:])
handle_default_options(options)
try:
self.execute(*args, **options.__dict__)
except Exception as e:
if options.traceback:
self.stderr.write(traceback.format_exc())
self.stderr.write('%s: %s' % (e.__class__.__name__, e))
sys.exit(1)
def execute(self, *args, **options):
"""
Try to execute this command, performing model validation if
needed (as controlled by the attribute
``self.requires_model_validation``, except if force-skipped). If the
command raises a ``CommandError``, intercept it and print it sensibly
to stderr.
``self.requires_model_validation``, except if force-skipped).
"""
show_traceback = options.get('traceback', False)
# Switch to English, because django-admin.py creates database content
# like permissions, and those shouldn't contain any translations.
@ -237,18 +242,9 @@ class BaseCommand(object):
self.stderr = OutputWrapper(options.get('stderr', sys.stderr), self.style.ERROR)
if self.can_import_settings:
try:
from django.utils import translation
saved_lang = translation.get_language()
translation.activate('en-us')
except ImportError as e:
# If settings should be available, but aren't,
# raise the error and quit.
if show_traceback:
traceback.print_exc()
else:
self.stderr.write('Error: %s' % e)
sys.exit(1)
try:
if self.requires_model_validation and not options.get('skip_validation'):
@ -265,12 +261,6 @@ class BaseCommand(object):
self.stdout.write(output)
if self.output_transaction:
self.stdout.write('\n' + self.style.SQL_KEYWORD("COMMIT;"))
except CommandError as e:
if show_traceback:
traceback.print_exc()
else:
self.stderr.write('Error: %s' % e)
sys.exit(1)
finally:
if saved_lang is not None:
translation.activate(saved_lang)

10
docs/howto/custom-management-commands.txt
View File

@ -317,8 +317,12 @@ Exception class indicating a problem while executing a management
command.
If this exception is raised during the execution of a management
command, it will be caught and turned into a nicely-printed error
message to the appropriate output stream (i.e., stderr); as a
result, raising this exception (with a sensible description of the
command from a command line console, it will be caught and turned into a
nicely-printed error message to the appropriate output stream (i.e., stderr);
as a result, raising this exception (with a sensible description of the
error) is the preferred way to indicate that something has gone
wrong in the execution of a command.
If a management command is called from code through
:ref:`call_command <call-command>`, it's up to you to catch the exception
when needed.

4
docs/releases/1.5.txt
View File

@ -75,6 +75,10 @@ Django 1.5 also includes several smaller improvements worth noting:
* The generic views support OPTIONS requests.
* Management commands do not raise ``SystemExit`` any more when called by code
from :ref:`call_command <call-command>`. Any exception raised by the command
(mostly :ref:`CommandError <ref-command-exceptions>`) is propagated.
* The dumpdata management command outputs one row at a time, preventing
out-of-memory errors when dumping large datasets.

4
tests/modeltests/fixtures/tests.py
View File

@ -185,14 +185,14 @@ class FixtureLoadingTests(TestCase):
exclude_list=['fixtures.Article', 'fixtures.Book', 'sites'])
# Excluding a bogus app should throw an error
self.assertRaises(SystemExit,
self.assertRaises(management.CommandError,
self._dumpdata_assert,
['fixtures', 'sites'],
'',
exclude_list=['foo_app'])
# Excluding a bogus model should throw an error
self.assertRaises(SystemExit,
self.assertRaises(management.CommandError,
self._dumpdata_assert,
['fixtures', 'sites'],
'',

8
tests/modeltests/user_commands/management/commands/dance.py
View File

@ -1,6 +1,6 @@
from optparse import make_option
from django.core.management.base import BaseCommand
from django.core.management.base import BaseCommand, CommandError
class Command(BaseCommand):
@ -8,11 +8,13 @@ class Command(BaseCommand):
args = ''
requires_model_validation = True
option_list =[
option_list = BaseCommand.option_list + (
make_option("-s", "--style", default="Rock'n'Roll"),
make_option("-x", "--example")
]
)
def handle(self, *args, **options):
example = options["example"]
if example == "raise":
raise CommandError()
self.stdout.write("I don't feel like dancing %s." % options["style"])

17
tests/modeltests/user_commands/tests.py
View File

@ -1,3 +1,4 @@
import sys
from StringIO import StringIO
from django.core import management
@ -26,4 +27,20 @@ class CommandTests(TestCase):
self.assertEqual(translation.get_language(), 'fr')
def test_explode(self):
""" Test that an unknown command raises CommandError """
self.assertRaises(CommandError, management.call_command, ('explode',))
def test_system_exit(self):
""" Exception raised in a command should raise CommandError with
call_command, but SystemExit when run from command line
"""
with self.assertRaises(CommandError):
management.call_command('dance', example="raise")
old_stderr = sys.stderr
sys.stderr = err = StringIO()
try:
with self.assertRaises(SystemExit):
management.ManagementUtility(['manage.py', 'dance', '--example=raise']).execute()
finally:
sys.stderr = old_stderr
self.assertIn("CommandError", err.getvalue())