def __init__(self, cwd):

        self.cwd = cwd

    def execute(self, cmd, *args, **environ):

        """

        Runs command on the system with given ``args``.

        """

        command = cmd + ' ' + ' '.join(args)

        ignoreReturnCode = environ.pop('ignoreReturnCode', False)

        if DEBUG:

            print '*** CMD %s ***' % command

        testenv = dict(os.environ)

        testenv['LANG'] = 'en_US.UTF-8'

        testenv['LANGUAGE'] = 'en_US:en'

        testenv['HGPLAIN'] = ''

        testenv['HGRCPATH'] = ''

        testenv.update(environ)

        p = Popen(command, shell=True, stdout=PIPE, stderr=PIPE, cwd=self.cwd, env=testenv)

        stdout, stderr = p.communicate()

        if DEBUG:

            if stdout:

                print 'stdout:', repr(stdout)

            if stderr:

                print 'stderr:', repr(stderr)

        if not ignoreReturnCode:

            assert p.returncode == 0

        return stdout, stderr

def _get_tmp_dir(prefix='vcs_operations-', suffix=''):

    return tempfile.mkdtemp(dir=TESTS_TMP_PATH, prefix=prefix, suffix=suffix)

def _add_files_and_push(webserver, vcs, DEST, ignoreReturnCode=False, files_no=3,

                        clone_url=None, username=TEST_USER_ADMIN_LOGIN, password=TEST_USER_ADMIN_PASS):

    """

    Generate some files, add it to DEST repo and push back

    vcs is git or hg and defines what VCS we want to make those files for

    :param vcs:

    :param DEST:

    """

    # commit some stuff into this repo

    cwd = os.path.join(DEST)

    #added_file = '%ssetupążźć.py' % _RandomNameSequence().next()

    added_file = '%ssetup.py' % _RandomNameSequence().next()

    Command(cwd).execute('%s add %s' % (vcs, added_file))

    email = 'me@example.com'

    if os.name == 'nt':

        author_str = 'User <%s>' % email

    else:

        author_str = 'User ǝɯɐᴎ <%s>' % email

    for i in xrange(files_no):

        cmd = """echo "added_line%s" >> %s""" % (i, added_file)

        Command(cwd).execute(cmd)

        if vcs == 'hg':

            cmd = """hg commit -m "committed new %s" -u "%s" "%s" """ % (

                i, author_str, added_file

            )

        elif vcs == 'git':

            cmd = """git commit -m "committed new %s" --author "%s" "%s" """ % (

                i, author_str, added_file

            )

        # git commit needs EMAIL on some machines

        Command(cwd).execute(cmd, EMAIL=email)

    # PUSH it back

    _REPO = None

    if vcs == 'hg':

        _REPO = HG_REPO

    elif vcs == 'git':

        _REPO = GIT_REPO

    if clone_url is None:

        clone_url = webserver.repo_url(_REPO, username=username, password=password)

    stdout = stderr = None

    if vcs == 'hg':

        stdout, stderr = Command(cwd).execute('hg push --verbose', clone_url, ignoreReturnCode=ignoreReturnCode)

    elif vcs == 'git':

        stdout, stderr = Command(cwd).execute('git push --verbose', clone_url, "master", ignoreReturnCode=ignoreReturnCode)

    return stdout, stderr

def set_anonymous_access(enable=True):

    user = User.get_default_user()

    user.active = enable

    Session().commit()

    print '\tanonymous access is now:', enable

    if enable != User.get_default_user().active:

        raise Exception('Cannot set anonymous access')