class Command(object):

    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:

            if 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(vcs, dest_dir, files_no=3):

    """

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

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

    :param vcs:

    :param dest_dir:

    """

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

    open(os.path.join(dest_dir, added_file), 'a').close()

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

    email = 'me@example.com'

    if os.name == 'nt':

        author_str = 'User <%s>' % email