src/xmlpatterns/api/qreferencecountedvalue_p.h


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/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtXmlPatterns module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the either Technology Preview License Agreement or the
** Beta Release License Agreement.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain
** additional rights. These rights are described in the Nokia Qt LGPL
** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
** package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you are unsure which license is appropriate for your use, please
** contact the sales department at http://qt.nokia.com/contact.
** $QT_END_LICENSE$
**
****************************************************************************/

//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API.  It exists purely as an
// implementation detail.  This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.

#ifndef QPatternist_ReferenceCountedValue_p_h
#define QPatternist_ReferenceCountedValue_p_h

QT_BEGIN_HEADER
QT_BEGIN_NAMESPACE

namespace QPatternist
{
/*!
   \class ReferenceCountedValue
   \internal
   \since 4.4
   \brief A template class that reference counts a value.

   This class is useful when an instance needs to have ownership semantics
   as if it was value based. A typical examples is a QObject pointer, which
   doesn't have a single owner.

   This is achieved through storing a copy of the object as
   a member inside ReferenceCountedValue, which never is copied. It will
   stay in scope until the last reference to the ReferenceCountedValue instance
   is removed, and subsequently ReferenceCountedValue is deleted and hence also
   the contained value. One should use ReferenceCountedValue by passing around
   copies of Ptr, which is a typedef for the QExplicitlySharedDataPointer
   smart pointer.
*/
    template<typename T>
    class ReferenceCountedValue : public QSharedData
    {
    public:
        typedef QExplicitlySharedDataPointer<ReferenceCountedValue<T> > Ptr;

        inline ReferenceCountedValue(T *const v) : value(v)
        {
        }

        inline ~ReferenceCountedValue()
        {
            delete value;
        }

        T *const value;
    private:
        /*!
          Disabled, no implementation provided.
         */
        inline ReferenceCountedValue();
        Q_DISABLE_COPY(ReferenceCountedValue)
    };
}

QT_END_NAMESPACE
QT_END_HEADER

#endif
"""
Test harness for the venv module.

Copyright (C) 2011-2012 Vinay Sajip.
Licensed to the PSF under a contributor agreement.
"""

import ensurepip
import os
import os.path
import re
import struct
import subprocess
import sys
import tempfile
from test.support import (captured_stdout, captured_stderr, requires_zlib,
                          can_symlink, EnvironmentVarGuard, rmtree,
                          import_module)
import unittest
import venv
from unittest.mock import patch

try:
    import ctypes
except ImportError:
    ctypes = None

# Platforms that set sys._base_executable can create venvs from within
# another venv, so no need to skip tests that require venv.create().
requireVenvCreate = unittest.skipUnless(
    sys.prefix == sys.base_prefix
    or sys._base_executable != sys.executable,
    'cannot run venv.create from within a venv on this platform')

def check_output(cmd, encoding=None):
    p = subprocess.Popen(cmd,
        stdout=subprocess.PIPE,
        stderr=subprocess.PIPE,
        encoding=encoding)
    out, err = p.communicate()
    if p.returncode:
        raise subprocess.CalledProcessError(
            p.returncode, cmd, out, err)
    return out, err

class BaseTest(unittest.TestCase):
    """Base class for venv tests."""
    maxDiff = 80 * 50

    def setUp(self):
        self.env_dir = os.path.realpath(tempfile.mkdtemp())
        if os.name == 'nt':
            self.bindir = 'Scripts'
            self.lib = ('Lib',)
            self.include = 'Include'
        else:
            self.bindir = 'bin'
            self.lib = ('lib', 'python%d.%d' % sys.version_info[:2])
            self.include = 'include'
        executable = sys._base_executable
        self.exe = os.path.split(executable)[-1]
        if (sys.platform == 'win32'
            and os.path.lexists(executable)
            and not os.path.exists(executable)):
            self.cannot_link_exe = True
        else:
            self.cannot_link_exe = False

    def tearDown(self):
        rmtree(self.env_dir)

    def run_with_capture(self, func, *args, **kwargs):
        with captured_stdout() as output:
            with captured_stderr() as error:
                func(*args, **kwargs)
        return output.getvalue(), error.getvalue()

    def get_env_file(self, *args):
        return os.path.join(self.env_dir, *args)

    def get_text_file_contents(self, *args):
        with open(self.get_env_file(*args), 'r') as f:
            result = f.read()
        return result

class BasicTest(BaseTest):
    """Test venv module functionality."""

    def isdir(self, *args):
        fn = self.get_env_file(*args)
        self.assertTrue(os.path.isdir(fn))

    def test_defaults(self):
        """
        Test the create function with default arguments.
        """
        rmtree(self.env_dir)
        self.run_with_capture(venv.create, self.env_dir)
        self.isdir(self.bindir)
        self.isdir(self.include)
        self.isdir(*self.lib)
        # Issue 21197
        p = self.get_env_file('lib64')
        conditions = ((struct.calcsize('P') == 8) and (os.name == 'posix') and
                      (sys.platform != 'darwin'))
        if conditions:
            self.assertTrue(os.path.islink(p))
        else:
            self.assertFalse(os.path.exists(p))
        data = self.get_text_file_contents('pyvenv.cfg')
        executable = sys._base_executable
        path = os.path.dirname(executable)
        self.assertIn('home = %s' % path, data)
        fn = self.get_env_file(self.bindir, self.exe)
        if not os.path.exists(fn):  # diagnostics for Windows buildbot failures
            bd = self.get_env_file(self.bindir)
            print('Contents of %r:' % bd)
            print('    %r' % os.listdir(bd))
        self.assertTrue(os.path.exists(fn), 'File %r should exist.' % fn)

    def test_prompt(self):
        env_name = os.path.split(self.env_dir)[1]

        rmtree(self.env_dir)
        builder = venv.EnvBuilder()
        self.run_with_capture(builder.create, self.env_dir)
        context = builder.ensure_directories(self.env_dir)
        data = self.get_text_file_contents('pyvenv.cfg')
        self.assertEqual(context.prompt, '(%s) ' % env_name)
        self.assertNotIn("prompt = ", data)

        rmtree(self.env_dir)
        builder = venv.EnvBuilder(prompt='My prompt')
        self.run_with_capture(builder.create, self.env_dir)
        context = builder.ensure_directories(self.env_dir)
        data = self.get_text_file_contents('pyvenv.cfg')
        self.assertEqual(context.prompt, '(My prompt) ')
        self.assertIn("prompt = 'My prompt'\n", data)

    def test_upgrade_dependencies(self):
        builder = venv.EnvBuilder()
        bin_path = 'Scripts' if sys.platform == 'win32' else 'bin'
        pip_exe = 'pip.exe' if sys.platform == 'win32' else 'pip'
        with tempfile.TemporaryDirectory() as fake_env_dir:

            def pip_cmd_checker(cmd):
                self.assertEqual(
                    cmd,
                    [
                        os.path.join(fake_env_dir, bin_path, pip_exe),
                        'install',
                        '-U',
                        'pip',
                        'setuptools'
                    ]
                )

            fake_context = builder.ensure_directories(fake_env_dir)
            with patch('venv.subprocess.check_call', pip_cmd_checker):
                builder.upgrade_dependencies(fake_context)

    @requireVenvCreate
    def test_prefixes(self):
        """
        Test that the prefix values are as expected.
        """
        # check a venv's prefixes
        rmtree(self.env_dir)
        self.run_with_capture(venv.create, self.env_dir)
        envpy = os.path.join(self.env_dir, self.bindir, self.exe)
        cmd = [envpy, '-c', None]
        for prefix, expected in (
            ('prefix', self.env_dir),
            ('exec_prefix', self.env_dir),
            ('base_prefix', sys.base_prefix),
            ('base_exec_prefix', sys.base_exec_prefix)):
            cmd[2] = 'import sys; print(sys.%s)' % prefix
            out, err = check_output(cmd)
            self.assertEqual(out.strip(), expected.encode())

    if sys.platform == 'win32':
        ENV_SUBDIRS = (
            ('Scripts',),
            ('Include',),
            ('Lib',),
            ('Lib', 'site-packages'),
        )
    else:
        ENV_SUBDIRS = (
            ('bin',),
            ('include',),
            ('lib',),
            ('lib', 'python%d.%d' % sys.version_info[:2]),
            ('lib', 'python%d.%d' % sys.version_info[:2], 'site-packages'),
        )

    def create_contents(self, paths, filename):
        """
        Create some files in the environment which are unrelated
        to the virtual environment.
        """
        for subdirs in paths:
            d = os.path.join(self.env_dir, *subdirs)
            os.mkdir(d)
            fn = os.path.join(d, filename)
            with open(fn, 'wb') as f:
                f.write(b'Still here?')

    def test_overwrite_existing(self):
        """
        Test creating environment in an existing directory.
        """
        self.create_contents(self.ENV_SUBDIRS, 'foo')
        venv.create(self.env_dir)
        for subdirs in self.ENV_SUBDIRS:
            fn = os.path.join(self.env_dir, *(subdirs + ('foo',)))
            self.assertTrue(os.path.exists(fn))
            with open(fn, 'rb') as f:
                self.assertEqual(f.read(), b'Still here?')

        builder = venv.EnvBuilder(clear=True)
        builder.create(self.env_dir)
        for subdirs in self.ENV_SUBDIRS:
            fn = os.path.join(self.env_dir, *(subdirs + ('foo',)))
            self.assertFalse(os.path.exists(fn))

    def clear_directory(self, path):
        for fn in os.listdir(path):
            fn = os.path.join(path, fn)
            if os.path.islink(fn) or os.path.isfile(fn):
                os.remove(fn)
            elif os.path.isdir(fn):
                rmtree(fn)

    def test_unoverwritable_fails(self):
        #create a file clashing with directories in the env dir
        for paths in self.ENV_SUBDIRS[:3]:
            fn = os.path.join(self.env_dir, *paths)
            with open(fn, 'wb') as f:
                f.write(b'')
            self.assertRaises((ValueError, OSError), venv.create, self.env_dir)
            self.clear_directory(self.env_dir)

    def test_upgrade(self):
        """
        Test upgrading an existing environment directory.
        """
        # See Issue #21643: the loop needs to run twice to ensure
        # that everything works on the upgrade (the first run just creates
        # the venv).
        for upgrade in (False, True):
            builder = venv.EnvBuilder(upgrade=upgrade)
            self.run_with_capture(builder.create, self.env_dir)
            self.isdir(self.bindir)
            self.isdir(self.include)
            self.isdir(*self.lib)
            fn = self.get_env_file(self.bindir, self.exe)
            if not os.path.exists(fn):
                # diagnostics for Windows buildbot failures
                bd = self.get_env_file(self.bindir)
                print('Contents of %r:' % bd)
                print('    %r' % os.listdir(bd))
            self.assertTrue(os.path.exists(fn), 'File %r should exist.' % fn)

    def test_isolation(self):
        """
        Test isolation from system site-packages
        """
        for ssp, s in ((True, 'true'), (False, 'false')):
            builder = venv.EnvBuilder(clear=True, system_site_packages=ssp)
            builder.create(self.env_dir)
            data = self.get_text_file_contents('pyvenv.cfg')
            self.assertIn('include-system-site-packages = %s\n' % s, data)

    @unittest.skipUnless(can_symlink(), 'Needs symlinks')
    def test_symlinking(self):
        """
        Test symlinking works as expected
        """
        for usl in (False, True):
            builder = venv.EnvBuilder(clear=True, symlinks=usl)
            builder.create(self.env_dir)
            fn = self.get_env_file(self.bindir, self.exe)
            # Don't test when False, because e.g. 'python' is always
            # symlinked to 'python3.3' in the env, even when symlinking in
            # general isn't wanted.
            if usl:
                if self.cannot_link_exe:
                    # Symlinking is skipped when our executable is already a
                    # special app symlink
                    self.assertFalse(os.path.islink(fn))
                else:
                    self.assertTrue(os.path.islink(fn))

    # If a venv is created from a source build and that venv is used to
    # run the test, the pyvenv.cfg in the venv created in the test will
    # point to the venv being used to run the test, and we lose the link
    # to the source build - so Python can't initialise properly.
    @requireVenvCreate
    def test_executable(self):
        """
        Test that the sys.executable value is as expected.
        """
        rmtree(self.env_dir)
        self.run_with_capture(venv.create, self.env_dir)
        envpy = os.path.join(os.path.realpath(self.env_dir),
                             self.bindir, self.exe)
        out, err = check_output([envpy, '-c',
            'import sys; print(sys.executable)'])
        self.assertEqual(out.strip(), envpy.encode())

    @unittest.skipUnless(can_symlink(), 'Needs symlinks')
    def test_executable_symlinks(self):
        """
        Test that the sys.executable value is as expected.
        """
        rmtree(self.env_dir)
        builder = venv.EnvBuilder(clear=True, symlinks=True)
        builder.create(self.env_dir)
        envpy = os.path.join(os.path.realpath(self.env_dir),
                             self.bindir, self.exe)
        out, err = check_output([envpy, '-c',
            'import sys; print(sys.executable)'])
        self.assertEqual(out.strip(), envpy.encode())

    @unittest.skipUnless(os.name == 'nt', 'only relevant on Windows')
    def test_unicode_in_batch_file(self):
        """
        Test handling of Unicode paths
        """
        rmtree(self.env_dir)
        env_dir = os.path.join(os.path.realpath(self.env_dir), 'ϼўТλФЙ')
        builder = venv.EnvBuilder(clear=True)
        builder.create(env_dir)
        activate = os.path.join(env_dir, self.bindir, 'activate.bat')
        envpy = os.path.join(env_dir, self.bindir, self.exe)
        out, err = check_output(
            [activate, '&', self.exe, '-c', 'print(0)'],
            encoding='oem',
        )
        self.assertEqual(out.strip(), '0')

    @requireVenvCreate
    def test_multiprocessing(self):
        """
        Test that the multiprocessing is able to spawn.
        """
        # Issue bpo-36342: Instantiation of a Pool object imports the
        # multiprocessing.synchronize module. Skip the test if this module
        # cannot be imported.
        import_module('multiprocessing.synchronize')
        rmtree(self.env_dir)
        self.run_with_capture(venv.create, self.env_dir)
        envpy = os.path.join(os.path.realpath(self.env_dir),
                             self.bindir, self.exe)
        out, err = check_output([envpy, '-c',
            'from multiprocessing import Pool; '
            'pool = Pool(1); '
            'print(pool.apply_async("Python".lower).get(3)); '
            'pool.terminate()'])
        self.assertEqual(out.strip(), "python".encode())

@requireVenvCreate
class EnsurePipTest(BaseTest):
    """Test venv module installation of pip."""
    def assert_pip_not_installed(self):
        envpy = os.path.join(os.path.realpath(self.env_dir),
                             self.bindir, self.exe)
        out, err = check_output([envpy, '-c',
            'try:\n import pip\nexcept ImportError:\n print("OK")'])
        # We force everything to text, so unittest gives the detailed diff
        # if we get unexpected results
        err = err.decode("latin-1") # Force to text, prevent decoding errors
        self.assertEqual(err, "")
        out = out.decode("latin-1") # Force to text, prevent decoding errors
        self.assertEqual(out.strip(), "OK")


    def test_no_pip_by_default(self):
        rmtree(self.env_dir)
        self.run_with_capture(venv.create, self.env_dir)
        self.assert_pip_not_installed()

    def test_explicit_no_pip(self):
        rmtree(self.env_dir)
        self.run_with_capture(venv.create, self.env_dir, with_pip=False)
        self.assert_pip_not_installed()

    def test_devnull(self):
        # Fix for issue #20053 uses os.devnull to force a config file to
        # appear empty. However http://bugs.python.org/issue20541 means
        # that doesn't currently work properly on Windows. Once that is
        # fixed, the "win_location" part of test_with_pip should be restored
        with open(os.devnull, "rb") as f:
            self.assertEqual(f.read(), b"")

        # Issue #20541: os.path.exists('nul') is False on Windows
        if os.devnull.lower() == 'nul':
            self.assertFalse(os.path.exists(os.devnull))
        else:
            self.assertTrue(os.path.exists(os.devnull))

    def do_test_with_pip(self, system_site_packages):
        rmtree(self.env_dir)
        with EnvironmentVarGuard() as envvars:
            # pip's cross-version compatibility may trigger deprecation
            # warnings in current versions of Python. Ensure related
            # environment settings don't cause venv to fail.
            envvars["PYTHONWARNINGS"] = "e"
            # ensurepip is different enough from a normal pip invocation
            # that we want to ensure it ignores the normal pip environment
            # variable settings. We set PIP_NO_INSTALL here specifically
            # to check that ensurepip (and hence venv) ignores it.
            # See http://bugs.python.org/issue19734
            envvars["PIP_NO_INSTALL"] = "1"
            # Also check that we ignore the pip configuration file
            # See http://bugs.python.org/issue20053
            with tempfile.TemporaryDirectory() as home_dir:
                envvars["HOME"] = home_dir
                bad_config = "[global]\nno-install=1"
                # Write to both config file names on all platforms to reduce
                # cross-platform variation in test code behaviour
                win_location = ("pip", "pip.ini")
                posix_location = (".pip", "pip.conf")
                # Skips win_location due to http://bugs.python.org/issue20541
                for dirname, fname in (posix_location,):
                    dirpath = os.path.join(home_dir, dirname)
                    os.mkdir(dirpath)
                    fpath = os.path.join(dirpath, fname)
                    with open(fpath, 'w') as f:
                        f.write(bad_config)

                # Actually run the create command with all that unhelpful
                # config in place to ensure we ignore it
                try:
                    self.run_with_capture(venv.create, self.env_dir,
                                          system_site_packages=system_site_packages,
                                          with_pip=True)
                except subprocess.CalledProcessError as exc:
                    # The output this produces can be a little hard to read,
                    # but at least it has all the details
                    details = exc.output.decode(errors="replace")
                    msg = "{}\n\n**Subprocess Output**\n{}"
                    self.fail(msg.format(exc, details))
        # Ensure pip is available in the virtual environment
        envpy = os.path.join(os.path.realpath(self.env_dir), self.bindir, self.exe)
        # Ignore DeprecationWarning since pip code is not part of Python
        out, err = check_output([envpy, '-W', 'ignore::DeprecationWarning', '-I',
               '-m', 'pip', '--version'])
        # We force everything to text, so unittest gives the detailed diff
        # if we get unexpected results
        err = err.decode("latin-1") # Force to text, prevent decoding errors
        self.assertEqual(err, "")
        out = out.decode("latin-1") # Force to text, prevent decoding errors
        expected_version = "pip {}".format(ensurepip.version())
        self.assertEqual(out[:len(expected_version)], expected_version)
        env_dir = os.fsencode(self.env_dir).decode("latin-1")
        self.assertIn(env_dir, out)

        # http://bugs.python.org/issue19728
        # Check the private uninstall command provided for the Windows
        # installers works (at least in a virtual environment)
        with EnvironmentVarGuard() as envvars:
            out, err = check_output([envpy,
                '-W', 'ignore::DeprecationWarning', '-I',
                '-m', 'ensurepip._uninstall'])
        # We force everything to text, so unittest gives the detailed diff
        # if we get unexpected results
        err = err.decode("latin-1") # Force to text, prevent decoding errors
        # Ignore the warning:
        #   "The directory '$HOME/.cache/pip/http' or its parent directory
        #    is not owned by the current user and the cache has been disabled.
        #    Please check the permissions and owner of that directory. If
        #    executing pip with sudo, you may want sudo's -H flag."
        # where $HOME is replaced by the HOME environment variable.
        err = re.sub("^(WARNING: )?The directory .* or its parent directory "
                     "is not owned by the current user .*$", "",
                     err, flags=re.MULTILINE)
        self.assertEqual(err.rstrip(), "")
        # Being fairly specific regarding the expected behaviour for the
        # initial bundling phase in Python 3.4. If the output changes in
        # future pip versions, this test can likely be relaxed further.
        out = out.decode("latin-1") # Force to text, prevent decoding errors
        self.assertIn("Successfully uninstalled pip", out)
        self.assertIn("Successfully uninstalled setuptools", out)
        # Check pip is now gone from the virtual environment. This only
        # applies in the system_site_packages=False case, because in the
        # other case, pip may still be available in the system site-packages
        if not system_site_packages:
            self.assert_pip_not_installed()

    # Issue #26610: pip/pep425tags.py requires ctypes
    @unittest.skipUnless(ctypes, 'pip requires ctypes')
    @requires_zlib
    def test_with_pip(self):