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# Copyright (C) 2007-2011 Canonical Ltd
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
"""Tests for the strace-invoking support."""
import threading
from bzrlib import (
strace,
tests,
)
from bzrlib.strace import strace_detailed, StraceResult
from bzrlib.tests.features import (
strace_feature,
)
class TestStrace(tests.TestCaseWithTransport):
_test_needs_features = [strace_feature]
def setUp(self):
# NB: see http://pad.lv/626679 and
# <https://code.launchpad.net/~mbp/bzr/626679-strace/+merge/34157>:
# testing strace by connecting to ourselves has repeatedly caused
# hangs in running the test suite; these are fixable given enough
# determination but given that strace is not used by any other tests
# at the moment and that it's only test-support code, we just leave it
# untested -- mbp 20100901
raise tests.TestSkipped("strace selftests are broken and disabled")
def _check_threads(self):
# For bug #226769, it was decided that the strace tests should not be
# run when more than one thread is active. A lot of tests are currently
# leaking threads for good or bad reasons, once they are fixed or
# strace itself is fixed (bug #103133), we can get rid of the
# restriction.
active = threading.activeCount()
if active > 1: # There is always the main thread at least
self.knownFailure(
'%d active threads, bug #103133 needs to be fixed.' % active)
def strace_detailed_or_skip(self, *args, **kwargs):
"""Run strace, but cope if it's not allowed"""
try:
return strace_detailed(*args, **kwargs)
except strace.StraceError, e:
if e.err_messages.startswith(
"attach: ptrace(PTRACE_ATTACH, ...): Operation not permitted"):
raise tests.TestSkipped("ptrace not permitted")
else:
raise
def test_strace_callable_is_called(self):
self._check_threads()
output = []
def function(positional, *args, **kwargs):
output.append((positional, args, kwargs))
self.strace_detailed_or_skip(
function, ["a", "b"], {"c": "c"},
follow_children=False)
self.assertEqual([("a", ("b",), {"c":"c"})], output)
def test_strace_callable_result(self):
self._check_threads()
def function():
return "foo"
result, strace_result = self.strace_detailed_or_skip(function,[], {},
follow_children=False)
self.assertEqual("foo", result)
self.assertIsInstance(strace_result, StraceResult)
def test_strace_result_has_raw_log(self):
"""Checks that a reasonable raw strace log was found by strace."""
self._check_threads()
def function():
self.build_tree(['myfile'])
unused, result = self.strace_detailed_or_skip(function, [], {},
follow_children=False)
self.assertContainsRe(result.raw_log, 'myfile')
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