2012-04-25  Kristóf Kosztyó  <kkristof@inf.u-szeged.hu>

        [Qt][NRWT] Run each DRT in it's own xvfb

        https://bugs.webkit.org/show_bug.cgi?id=77335

        Reviewed by NOBODY (OOPS!).

        * Scripts/webkitpy/layout_tests/port/gtk.py:

        (GtkPort._driver_class):

        * Scripts/webkitpy/layout_tests/port/qt.py:

        (QtPort._driver_class):

        * Scripts/webkitpy/layout_tests/port/xvfbdriver.py: Added.

        (XvfbDriver):

        (XvfbDriver._start):

        (XvfbDriver._start.x_filter):

        (XvfbDriver.stop):

    def _driver_class(self):

        return XvfbDriver

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import logging

import os

import signal

import subprocess

from webkitpy.layout_tests.port.server_process import ServerProcess

from webkitpy.layout_tests.port.webkit import WebKitDriver

from webkitpy.common.system.executive import Executive

_log = logging.getLogger(__name__)

class XvfbDriver(WebKitDriver):

    def _start(self, pixel_tests, per_test_args):

        # Collect the number of X servers running already and make

        # sure our Xvfb process doesn't clash with any of them.

        def x_filter(process_name):

            return process_name.find("Xorg") > -1

        running_displays = len(Executive().running_pids(x_filter))

        # Use even displays for pixel tests and odd ones otherwise. When pixel tests are disabled,

        # DriverProxy creates two drivers, one for normal and the other for ref tests. Both have

        # the same worker number, so this prevents them from using the same Xvfb instance.

        display_id = self._worker_number * 2 + running_displays

        if self._port.get_option('pixel_tests'):

            display_id += 1

        run_xvfb = ["Xvfb", ":%d" % (display_id), "-screen",  "0", "800x600x24", "-nolisten", "tcp"]

        with open(os.devnull, 'w') as devnull:

            self._xvfb_process = subprocess.Popen(run_xvfb, stderr=devnull)

        server_name = self._port.driver_name()

        environment = self._port.setup_environ_for_server(server_name)

        # We must do this here because the DISPLAY number depends on _worker_number

        environment['DISPLAY'] = ":%d" % (display_id)

        self._crashed_process_name = None

        self._crashed_pid = None

        self._server_process = ServerProcess(self._port, server_name, self.cmd_line(pixel_tests, per_test_args), environment)

    def stop(self):

        WebKitDriver.stop(self)

        if getattr(self, '_xvfb_process', None):

            Executive().kill_process(self._xvfb_process.pid)

            self._xvfb_process.wait()

            self._xvfb_process = None