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=== modified file 'NEWS'
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--- NEWS	2010-09-01 08:02:42 +0000
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+++ NEWS	2010-09-01 08:49:39 +0000
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@@ -142,6 +142,10 @@
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  fetching from repositories with affected revisions.
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  fetching from repositories with affected revisions.
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  (Andrew Bennetts, #522637)
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  (Andrew Bennetts, #522637)
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* strace test-helper tests cope with the new Ubuntu policy of not allowing
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  users to attach to their own processes by default.
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  (Martin Pool, #626679)
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* ``Transport.stat`` on a symlink, including a transport pointing directly
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* ``Transport.stat`` on a symlink, including a transport pointing directly
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  to a symlink, now returns information about the symlink.
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  to a symlink, now returns information about the symlink.
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  (Martin Pool)
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  (Martin Pool)
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=== modified file 'bzrlib/strace.py'
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--- bzrlib/strace.py	2009-03-23 14:59:43 +0000
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+++ bzrlib/strace.py	2010-09-01 08:49:39 +0000
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@@ -23,6 +23,9 @@
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import subprocess
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import subprocess
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import tempfile
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import tempfile
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from bzrlib import errors
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# this is currently test-focused, so importing bzrlib.tests is ok. We might
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# this is currently test-focused, so importing bzrlib.tests is ok. We might
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# want to move feature to its own module though.
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# want to move feature to its own module though.
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from bzrlib.tests import Feature
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from bzrlib.tests import Feature
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@@ -46,14 +49,17 @@
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    # capture strace output to a file
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    # capture strace output to a file
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    log_file = tempfile.NamedTemporaryFile()
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    log_file = tempfile.NamedTemporaryFile()
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    log_file_fd = log_file.fileno()
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    log_file_fd = log_file.fileno()
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    err_file = tempfile.NamedTemporaryFile()
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    pid = os.getpid()
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    pid = os.getpid()
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    # start strace
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    # start strace
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    strace_cmd = ['strace', '-r', '-tt', '-p', str(pid), '-o', log_file.name]
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    strace_cmd = ['strace', '-r', '-tt', '-p', str(pid), '-o', log_file.name]
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    if follow_children:
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    if follow_children:
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        strace_args.append('-f')
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        strace_args.append('-f')
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    # need to catch both stdout and stderr to work around
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    # bug 627208
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    proc = subprocess.Popen(strace_cmd,
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    proc = subprocess.Popen(strace_cmd,
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                            stdout=subprocess.PIPE,
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                            stdout=subprocess.PIPE,
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                            stderr=subprocess.STDOUT)
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                            stderr=err_file.fileno())
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    # Wait for strace to attach
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    # Wait for strace to attach
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    attached_notice = proc.stdout.readline()
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    attached_notice = proc.stdout.readline()
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    # Run the function to strace
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    # Run the function to strace
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@@ -65,18 +71,31 @@
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    log_file.seek(0)
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    log_file.seek(0)
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    log = log_file.read()
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    log = log_file.read()
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    log_file.close()
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    log_file.close()
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    return result, StraceResult(log)
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    # and stderr
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    err_file.seek(0)
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    err_messages = err_file.read()
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    err_file.close()
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    # and read any errors
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    if err_messages.startswith("attach: ptrace(PTRACE_ATTACH,"):
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        raise StraceError(err_messages=err_messages)
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    return result, StraceResult(log, err_messages)
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class StraceError(errors.BzrError):
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    _fmt = "strace failed: %(err_messages)s"
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class StraceResult(object):
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class StraceResult(object):
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    """The result of stracing a function."""
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    """The result of stracing a function."""
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    def __init__(self, raw_log):
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    def __init__(self, raw_log, err_messages):
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        """Create a StraceResult.
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        """Create a StraceResult.
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        :param raw_log: The output that strace created.
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        :param raw_log: The output that strace created.
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        """
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        """
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        self.raw_log = raw_log
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        self.raw_log = raw_log
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        self.err_messages = err_messages
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class _StraceFeature(Feature):
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class _StraceFeature(Feature):
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=== modified file 'bzrlib/tests/test_strace.py'
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--- bzrlib/tests/test_strace.py	2009-03-23 14:59:43 +0000
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+++ bzrlib/tests/test_strace.py	2010-09-01 08:49:39 +0000
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@@ -1,5 +1,4 @@
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1
# Copyright (C) 2007 Canonical Ltd
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# Copyright (C) 2007, 2010 Canonical Ltd
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#   Authors: Robert Collins <robert.collins@canonical.com>
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#
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#
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# This program is free software; you can redistribute it and/or modify
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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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# it under the terms of the GNU General Public License as published by
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@@ -22,34 +21,26 @@
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import threading
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import threading
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from bzrlib import (
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from bzrlib import (
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    strace,
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    tests,
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    tests,
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    )
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    )
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from bzrlib.strace import StraceFeature, strace_detailed, StraceResult
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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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class TestStrace(tests.TestCaseWithTransport):
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    _test_needs_features = [StraceFeature]
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    _test_needs_features = [StraceFeature]
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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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    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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        # 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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        # run when more than one thread is active. A lot of tests are currently
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@@ -61,14 +52,26 @@
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            raise tests.KnownFailure(
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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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                '%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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            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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    def test_strace_callable_is_called(self):
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    def test_strace_callable_is_called(self):
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        self._check_threads()
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        self._check_threads()
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        output = []
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        output = []
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        def function(positional, *args, **kwargs):
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        def function(positional, *args, **kwargs):
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            output.append((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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        self.strace_detailed_or_skip(
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                        follow_children=False)
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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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        self.assertEqual([("a", ("b",), {"c":"c"})], output)
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    def test_strace_callable_result(self):
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    def test_strace_callable_result(self):
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@@ -76,7 +79,7 @@
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        def function():
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        def function():
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            return "foo"
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            return "foo"
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        result, strace_result = strace_detailed(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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                                                follow_children=False)
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        self.assertEqual("foo", result)
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        self.assertEqual("foo", result)
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        self.assertIsInstance(strace_result, StraceResult)
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        self.assertIsInstance(strace_result, StraceResult)
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@@ -87,6 +90,6 @@
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        def function():
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        def function():
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            self.build_tree(['myfile'])
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            self.build_tree(['myfile'])
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        unused, result = strace_detailed(function, [], {},
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        unused, result = self.strace_detailed_or_skip(function, [], {},
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                                         follow_children=False)
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                                         follow_children=False)
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        self.assertContainsRe(result.raw_log, 'myfile')
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        self.assertContainsRe(result.raw_log, 'myfile')
Reviewer	Review Type	Date Requested	Status
Robert Collins (community)		2010-08-31	Approve on 2010-08-31
Review via email: mp+34157@code.launchpad.net