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#!/usr/bin/env python
#
#
# - inspired by PyVirtualDisplay: http://pypi.python.org/pypi/PyVirtualDisplay
# - Corey Goldberg, 2012
"""wrapper for running display inside X virtual framebuffer (Xvfb)"""
import os
import fnmatch
import random
import subprocess
import time
class Xvfb(object):
def __init__(self, width=800, height=680, colordepth=24):
self.width = width
self.height = height
self.colordepth = colordepth
self.xvfb_proc = None
self.old_display_num = \
os.environ['DISPLAY'].split(':')[1] if 'DISPLAY' in os.environ else 0
def start(self):
self.vdisplay_num = self.search_for_free_display()
self.xvfb_cmd = 'Xvfb :{0} -screen 0 {1}x{2}x{3} 2>&1 >{4}'.format(
self.vdisplay_num,
self.width,
self.height,
self.colordepth,
os.devnull
)
self.xvfb_proc = subprocess.Popen(self.xvfb_cmd,
stdout=open(os.devnull),
stderr=open(os.devnull),
shell=True
)
time.sleep(0.1) # give Xvfb time to start
self._redirect_display(self.vdisplay_num)
def stop(self):
self._redirect_display(self.old_display_num)
if self.xvfb_proc is not None:
self.xvfb_proc.kill()
self.xvfb_proc.wait()
self.xvfb_proc = None
def search_for_free_display(self):
ls = map(lambda x:int(x.split('X')[1].split('-')[0]), self._lock_files())
min_display_num = 1000
if len(ls):
display_num = max(min_display_num, max(ls) + 1)
else:
display_num = min_display_num
random.seed()
display_num += random.randint(0, 100)
return display_num
def _lock_files(self):
tmpdir = '/tmp'
pattern = '.X*-lock'
names = fnmatch.filter(os.listdir(tmpdir), pattern)
ls = [os.path.join(tmpdir, child) for child in names]
ls = [p for p in ls if os.path.isfile(p)]
return ls
def _redirect_display(self, display_num):
os.environ['DISPLAY'] = ':%s' % display_num