~bzr-pqm/bzr/bzr.dev

# Copyright (C) 2007-2010 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 errno

import subprocess

import threading

from bzrlib import (

    strace,

    tests,

    )

from bzrlib.strace import StraceFeature, strace_detailed, StraceResult

class TestStrace(tests.TestCaseWithTransport):

    _test_needs_features = [StraceFeature]

    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

            raise tests.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')