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import os
import socket
import sys
from session.Process import Process
import sugar.env
def get_display_number():
"""Find a free display number trying to connect to 6000+ ports"""
retries = 20
display_number = 1
display_is_free = False
while not display_is_free and retries > 0:
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
try:
s.connect(('127.0.0.1', 6000 + display_number))
s.close()
display_number += 1
retries -= 1
except:
display_is_free = True
if display_is_free:
return display_number
else:
logging.error('Cannot find a free display.')
sys.exit(0)
class XephyrProcess(Process):
def __init__(self):
self._display = get_display_number()
cmd = 'Xephyr :%d -ac -screen 800x600' % (self._display)
Process.__init__(self, cmd)
def get_name(self):
return 'Xephyr'
def start(self):
Process.start(self)
os.environ['DISPLAY'] = ":%d" % (self._display)
class XnestProcess(Process):
def __init__(self):
self._display = get_display_number()
cmd = 'Xnest :%d -ac -geometry 800x600' % (self._display)
Process.__init__(self, cmd)
def get_name(self):
return 'Xnest'
def start(self):
Process.start(self)
os.environ['DISPLAY'] = ":%d" % (self._display)
class DbusProcess(Process):
def __init__(self):
config = sugar.env.get_dbus_config()
cmd = "dbus-daemon --print-address --config-file %s" % config
Process.__init__(self, cmd)
def get_name(self):
return 'Dbus'
def start(self):
Process.start(self, True)
dbus_file = os.fdopen(self._stdout)
addr = dbus_file.readline().strip()
dbus_file.close()
os.environ["DBUS_SESSION_BUS_ADDRESS"] = addr
class Emulator:
"""The OLPC emulator"""
def start(self):
try:
process = XephyrProcess()
process.start()
except:
try:
process = XnestProcess()
process.start()
except:
print 'Cannot run the emulator. You need to install \
Xephyr or Xnest.'
sys.exit(0)
process = DbusProcess()
process.start()
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