gnome-shell/scripts/start-in-Xephyr

#!/usr/bin/python

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

# Uninstalled paths
scripts_dir = os.path.dirname(os.path.abspath(sys.argv[0]))
top_dir = os.path.dirname(scripts_dir)
plugin_dir = os.path.join(top_dir, "src")
plugin = os.path.join(plugin_dir, "libgnome-shell.la")
js_dir = os.path.join(top_dir, "js")

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
    os.environ['XAUTHORITY'] = xauth_file
    retcode = subprocess.call(["xauth", "add", display,  "MIT-MAGIC-COOKIE-1", hexkey])
    if retcode != 0:
        raise RuntimeError("xauth failed")

    # Launch Xephyr
    xephyr = subprocess.Popen(["Xephyr", display, "-screen", "800x600", "-host-cursor"])
    os.environ['DISPLAY'] = display

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

    # Start xterm to have some window in our session
    subprocess.Popen(["xterm"])

    # Now launch metacity-clutter with our plugin
    env=dict(os.environ)
    env.update({'GNOME_SHELL_JS'  : js_dir,
                'GI_TYPELIB_PATH' : plugin_dir,
                'LD_LIBRARY_PATH' : os.environ.get('LD_LIBRARY_PATH', '') + ':' + plugin_dir})
    args = 'DEBUG' in os.environ and os.environ['DEBUG'].split() or []
    args.extend(['metacity', '--mutter-plugins=' + plugin, '--replace'])
    print args
    subprocess.Popen(args, env=env)

    # Wait for Xephyr to exit
    try:
        retcode = xephyr.wait()
    except KeyboardInterrupt, e:
        os.kill(xephyr.pid, signal.SIGKILL)
finally:
    shutil.rmtree(tmpdir)