gnome-shell/scripts/start-in-Xephyr

#!/usr/bin/python

import os
import random
import shutil
import signal
import subprocess
import sys
import tempfile
import time

from launcher import Launcher

# GL_EXT_texture_from_pixmap doesn't work in Xepyhr
launcher = Launcher(use_tfp=False, accept_geometry=True)

# Temporary directory to hold our X credentials
tmpdir = tempfile.mkdtemp("", "gnome-shell.")
try:
    display = ":" + str(random.randint(10, 99))
    xauth_file = os.path.join(tmpdir, "database")

    # Create a random 128-byte key and format it as hex
    f = open("/dev/urandom", "r")
    key = f.read(16)
    f.close()
    hexkey = "".join(("%02x" % ord(byte) for byte in key))

    # Store that in an xauthority file as the key for connecting to our Xephyr
    retcode = subprocess.call(["xauth",
                               "-f", xauth_file,
                               "add", display,  "MIT-MAGIC-COOKIE-1", hexkey])
    if retcode != 0:
        raise RuntimeError("xauth failed")

    # Launch Xephyr
    xephyr = subprocess.Popen(["Xephyr", display,
                               "-auth", xauth_file,
                               "-screen", launcher.get_geometry(),
                               "-host-cursor"])
    os.environ['DISPLAY'] = display
    os.environ['XAUTHORITY'] = xauth_file

    # Wait for server to get going: LAME
    time.sleep(1)

    # Start some windows in our session. Specify explicit geometries
    # so we don't end up with the title bars underneath the panel
    subprocess.Popen(["xterm", "-geometry", "+30+30"])
    subprocess.Popen(["xlogo", "-geometry", "-0-0"])
    subprocess.Popen(["xeyes", "-geometry", "-0+30"])

    # Now launch metacity-clutter with our plugin
    shell = launcher.start_shell()
    
    # Wait for Xephyr to exit
    try:
        retcode = xephyr.wait()
    except KeyboardInterrupt, e:
        os.kill(xephyr.pid, signal.SIGKILL)
finally:
    shutil.rmtree(tmpdir)