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# Copyright 2013 The Chromium Authors
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
# pylint: disable=W0702
import os
import signal
import subprocess
import sys
import time
def _IsLinux():
"""Return True if on Linux; else False."""
return sys.platform.startswith('linux')
class Xvfb:
"""Class to start and stop Xvfb if relevant. Nop if not Linux."""
def __init__(self):
self._pid = 0
def Start(self):
"""Start Xvfb and set an appropriate DISPLAY environment. Linux only.
Copied from tools/code_coverage/coverage_posix.py
"""
if not _IsLinux():
return
proc = subprocess.Popen(['Xvfb', ':9', '-screen', '0', '1024x768x24',
'-ac'],
stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
self._pid = proc.pid
if not self._pid:
raise Exception('Could not start Xvfb')
os.environ['DISPLAY'] = ':9'
# Now confirm, giving a chance for it to start if needed.
for _ in range(10):
proc = subprocess.Popen('xdpyinfo >/dev/null', shell=True)
_, retcode = os.waitpid(proc.pid, 0)
if retcode == 0:
break
time.sleep(0.25)
if retcode != 0:
raise Exception('Could not confirm Xvfb happiness')
def Stop(self):
"""Stop Xvfb if needed. Linux only."""
if self._pid:
try:
os.kill(self._pid, signal.SIGKILL)
except:
pass
del os.environ['DISPLAY']
self._pid = 0
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