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Viewing changes to bzrlib/tests/test_strace.py

  • Committer: Martin Packman
  • Date: 2011-12-23 19:38:22 UTC
  • mto: This revision was merged to the branch mainline in revision 6405.
  • Revision ID: martin.packman@canonical.com-20111223193822-hesheea4o8aqwexv
Accept and document passing the medium rather than transport for smart connections

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bzrlib/tests/test_strace.py
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# Copyright (C) 2007 Canonical Ltd
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#   Authors: Robert Collins <robert.collins@canonical.com>
 
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# Copyright (C) 2007-2011 Canonical Ltd
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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"""Tests for the strace-invoking support."""
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import errno
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import subprocess
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from bzrlib.strace import StraceFeature, strace, StraceResult
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from bzrlib.tests import TestCaseWithTransport
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class TestStraceFeature(TestCaseWithTransport):
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    def test_strace_detection(self):
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        """Strace is available if its runnable."""
 
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import threading
 
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from bzrlib import (
 
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    strace,
 
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    tests,
 
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    )
 
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from bzrlib.strace import strace_detailed, StraceResult
 
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from bzrlib.tests.features import (
 
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    strace_feature,
 
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    )
 
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class TestStrace(tests.TestCaseWithTransport):
 
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    _test_needs_features = [strace_feature]
 
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    def setUp(self):
 
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        # NB: see http://pad.lv/626679 and
 
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        # <https://code.launchpad.net/~mbp/bzr/626679-strace/+merge/34157>:
 
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        # testing strace by connecting to ourselves has repeatedly caused
 
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        # hangs in running the test suite; these are fixable given enough
 
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        # determination but given that strace is not used by any other tests
 
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        # at the moment and that it's only test-support code, we just leave it
 
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        # untested -- mbp 20100901
 
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        raise tests.TestSkipped("strace selftests are broken and disabled")
 
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    def _check_threads(self):
 
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        # For bug #226769, it was decided that the strace tests should not be
 
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        # run when more than one thread is active. A lot of tests are currently
 
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        # leaking threads for good or bad reasons, once they are fixed or
 
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        # strace itself is fixed (bug #103133), we can get rid of the
 
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        # restriction.
 
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        active = threading.activeCount()
 
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        if active > 1: # There is always the main thread at least
 
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            self.knownFailure(
 
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                '%d active threads, bug #103133 needs to be fixed.' % active)
 
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    def strace_detailed_or_skip(self, *args, **kwargs):
 
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        """Run strace, but cope if it's not allowed"""
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        try:
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            proc = subprocess.Popen(['strace'],
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                stderr=subprocess.PIPE,
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                stdout=subprocess.PIPE)
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            proc.communicate()
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            found_strace = True
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        except OSError, e:
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            if e.errno == errno.ENOENT:
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                # strace is not installed
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                found_strace = False
 
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            return strace_detailed(*args, **kwargs)
 
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        except strace.StraceError, e:
 
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            if e.err_messages.startswith(
 
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                    "attach: ptrace(PTRACE_ATTACH, ...): Operation not permitted"):
 
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                raise tests.TestSkipped("ptrace not permitted")
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            else:
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                raise
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        self.assertEqual(found_strace, StraceFeature.available())
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class TestStrace(TestCaseWithTransport):
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    _test_needs_features = [StraceFeature]
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    def test_strace_callable_is_called(self):
 
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        self._check_threads()
 
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        output = []
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        def function(positional, *args, **kwargs):
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            output.append((positional, args, kwargs))
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        strace(function, "a", "b", c="c")
 
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        self.strace_detailed_or_skip(
 
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            function, ["a", "b"], {"c": "c"},
 
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            follow_children=False)
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        self.assertEqual([("a", ("b",), {"c":"c"})], output)
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    def test_strace_callable_result(self):
 
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        self._check_threads()
 
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        def function():
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            return "foo"
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        result, strace_result = strace(function)
 
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        result, strace_result = self.strace_detailed_or_skip(function,[], {},
 
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                                                follow_children=False)
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        self.assertEqual("foo", result)
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        self.assertIsInstance(strace_result, StraceResult)
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    def test_strace_result_has_raw_log(self):
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        """Checks that a reasonable raw strace log was found by strace."""
 
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        self._check_threads()
 
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        def function():
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            self.build_tree(['myfile'])
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        _, result = strace(function)
 
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        unused, result = self.strace_detailed_or_skip(function, [], {},
 
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                                         follow_children=False)
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        self.assertContainsRe(result.raw_log, 'myfile')