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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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#
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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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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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# GNU General Public License for more details.
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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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"""Tests for the strace-invoking support."""
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import errno
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import subprocess
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import threading
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from bzrlib import (
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    tests,
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    )
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from bzrlib.strace import StraceFeature, strace_detailed, StraceResult
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class TestStraceFeature(tests.TestCaseWithTransport):
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    def test_strace_detection(self):
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        """Strace is available if its runnable."""
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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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            else:
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                raise
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        self.assertEqual(found_strace, StraceFeature.available())
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class TestStrace(tests.TestCaseWithTransport):
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    _test_needs_features = [StraceFeature]
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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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            raise tests.KnownFailure(
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                '%d active threads, bug #103133 needs to be fixed.' % active)
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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_detailed(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_detailed(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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        unused, result = strace_detailed(function, [], {},
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                                         follow_children=False)
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        self.assertContainsRe(result.raw_log, 'myfile')