92 lines
2.6 KiB
Python
92 lines
2.6 KiB
Python
#!/usr/bin/env python
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#
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# * Corey Goldberg, 2012, 2013, 2015
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#
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# * inspired by:
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# PyVirtualDisplay: http://pypi.python.org/pypi/PyVirtualDisplay
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"""wrapper for running display inside X virtual framebuffer (Xvfb)"""
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import os
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import fnmatch
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import random
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import subprocess
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import time
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class Xvfb:
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def __init__(self, width=800, height=680, colordepth=24, **kwargs):
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self.width = width
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self.height = height
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self.colordepth = colordepth
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self.xvfb_cmd = [
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'-screen', '0', '%dx%dx%d' %
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(self.width, self.height, self.colordepth)
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]
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for key, value in kwargs.items():
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self.xvfb_cmd = self.xvfb_cmd + ['-%s' % key, value]
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self.proc = None
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if 'DISPLAY' in os.environ:
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self.old_display_num = os.environ['DISPLAY'].split(':')[1]
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else:
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self.old_display_num = 0
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def __enter__(self):
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self.start()
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return self
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def __exit__(self, exc_type, exc_val, exc_tb):
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self.stop()
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def start(self):
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self.vdisplay_num = self.search_for_free_display()
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self.xvfb_cmd = ['Xvfb', ':%d' % self.vdisplay_num] + self.xvfb_cmd
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self.proc = subprocess.Popen(self.xvfb_cmd,
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stdout=open(os.devnull),
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stderr=open(os.devnull),
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)
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time.sleep(0.2) # give Xvfb time to start
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ret_code = self.proc.poll()
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if ret_code is None:
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self._redirect_display(self.vdisplay_num)
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else:
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self._redirect_display(self.old_display_num)
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self.proc = None
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print('Error: Xvfb did not start')
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def stop(self):
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self._redirect_display(self.old_display_num)
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if self.proc is not None:
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self.proc.kill()
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self.proc.wait()
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self.proc = None
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def search_for_free_display(self):
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ls = [int(x.split('X')[1].split('-')[0]) for x in self._lock_files()]
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min_display_num = 1000
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if len(ls):
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display_num = max(min_display_num, max(ls) + 1)
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else:
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display_num = min_display_num
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random.seed()
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display_num += random.randint(0, 100)
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return display_num
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def _lock_files(self):
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tmpdir = '/tmp'
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pattern = '.X*-lock'
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names = fnmatch.filter(os.listdir(tmpdir), pattern)
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ls = [os.path.join(tmpdir, child) for child in names]
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ls = [p for p in ls if os.path.isfile(p)]
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return ls
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def _redirect_display(self, display_num):
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os.environ['DISPLAY'] = ':%s' % display_num
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