path: root/anaconda

#!/usr/bin/python
#
# anaconda: The Red Hat Linux Installation program
#
# Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007
# Red Hat, Inc.  All rights reserved.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
# Author(s): Brent Fox <bfox@redhat.com>
#            Mike Fulbright <msf@redhat.com>
#            Jakub Jelinek <jakub@redhat.com>
#            Jeremy Katz <katzj@redhat.com>
#            Chris Lumens <clumens@redhat.com>
#            Paul Nasrat <pnasrat@redhat.com>
#            Erik Troan <ewt@rpath.com>
#            Matt Wilson <msw@rpath.com>
#

# This toplevel file is a little messy at the moment...

import sys, os, re, time, subprocess
from optparse import OptionParser
from tempfile import mkstemp

# keep up with process ID of the window manager if we start it
wm_pid = None

# Make sure messages sent through python's warnings module get logged.
def AnacondaShowWarning(message, category, filename, lineno, file=sys.stderr, line=None):
    log.warning("%s" % warnings.formatwarning(message, category, filename, lineno, line))

def startMetacityWM():
    childpid = os.fork()
    if not childpid:
        cmd = '/usr/bin/metacity'
        if not os.access(cmd, os.X_OK):
            log.error("Unable to find the window manager binary.")
            sys.exit(1)
        args = ['--display', ':1',
                '--sm-disable']
        rc = iutil.execWithRedirect(cmd, args, 
                               stdout='/dev/null', stderr='/dev/null')
        if rc:
            log.error("Error running window manager.")
            sys.exit (rc)
        else:
            log.info("The window manager has terminated.")
            sys.exit(0)
    return childpid

def startAuditDaemon():
    childpid = os.fork()
    if not childpid:
        cmd = '/sbin/auditd'
        try:
            os.execl(cmd, cmd)
        except OSError as e:
            log.error("Error running the audit daemon: %s" % str(e))
        sys.exit(0)
    # auditd will turn into a daemon so catch the immediate child pid now:
    os.waitpid(childpid, 0)

# function to handle X startup special issues for anaconda
def doStartupX11Actions():
    global wm_pid

    setupGraphicalLinks()

    # now start up the window manager
    try:
        wm_pid = startMetacityWM()
        log.info("Starting window manager, pid %s." % (wm_pid,))
    except Exception:
        wm_pid = None
        log.error("Unable to start the window manager.")

    if wm_pid is not None:
        from pyanaconda import xutils

        try:
            xutils.setRootResource('Xcursor.size', '24')
            xutils.setRootResource('Xcursor.theme', 'Bluecurve')
            xutils.setRootResource('Xcursor.theme_core', 'true')

            xutils.setRootResource('Xft.antialias', '1')
            xutils.setRootResource('Xft.hinting', '1')
            xutils.setRootResource('Xft.hintstyle', 'hintslight')
            xutils.setRootResource('Xft.rgba', 'none')
        except Exception as e:
            sys.stderr.write("X SERVER STARTED, THEN FAILED");
            raise RuntimeError, "X server failed to start"

def set_x_resolution(runres):
    # cant do this if no window manager is running because otherwise when we
    # open and close an X connection in the xutils calls the X server will exit
    # since this is the first X connection (if no window manager is running)
    if runres and opts.display_mode == 'g' and not flags.usevnc and wm_pid :
        try:
            log.info("Setting the screen resolution to: %s.", runres)
            iutil.execWithRedirect("xrandr", 
                                   ["-d", ":1", "-s", runres],
                                   stdout="/dev/tty5", stderr="/dev/tty5")
        except RuntimeError as e:
            log.error("The X resolution not set")
            iutil.execWithRedirect("xrandr",
                                   ["-d", ":1", "-q"],
                                   stdout="/dev/tty5", stderr="/dev/tty5")

def setupPythonUpdates():
    from distutils.sysconfig import get_python_lib

    if not os.path.exists("/tmp/updates"):
        return

    for pkg in os.listdir("/tmp/updates"):
        d = "/tmp/updates/%s" % pkg

        if not os.path.isdir(d):
            continue

        # See if the package exists in /usr/lib{64,}/python/?.?/site-packages.
        # If it does, we can set it up as an update.  If not, the pkg is
        # likely a completely new directory and should not be looked at.
        dest = "%s/%s" % (get_python_lib(), pkg)
        if not os.access(dest, os.R_OK):
            dest = "%s/%s" % (get_python_lib(1), pkg)
            if not os.access(dest, os.R_OK):
                continue
        # Symlink over everything that's in the python libdir but not in
        # the updates directory.
        symlink_updates(dest, d)

    import glob
    import shutil
    for rule in glob.glob("/tmp/updates/*.rules"):
        target = "/etc/udev/rules.d/" + rule.split('/')[-1]
        shutil.copyfile(rule, target)

def symlink_updates(dest_dir, update_dir):    
    contents = os.listdir(update_dir)

    for f in os.listdir(dest_dir):
        dest_path = os.path.join(dest_dir, f)
        update_path = os.path.join(update_dir, f)
        if f in contents:
            # recurse into directories, there might be files missing in updates
            if os.path.isdir(dest_path) and os.path.isdir(update_path):
                symlink_updates(dest_path, update_path)
        else:
            if f.endswith(".pyc") or f.endswith(".pyo"):
                continue
            os.symlink(dest_path, update_path)

def parseOptions(argv = None):
    op = OptionParser()
    # Interface
    op.add_option("-C", "--cmdline", dest="display_mode", action="store_const", const="c",
                  default="g")
    op.add_option("-G", "--graphical", dest="display_mode", action="store_const", const="g")
    op.add_option("-T", "--text", dest="display_mode", action="store_const", const="t")

    # Network
    op.add_option("--noipv4", action="store_true", default=False)
    op.add_option("--noipv6", action="store_true", default=False)
    op.add_option("--proxy")
    op.add_option("--proxyAuth")

    # Method of operation
    op.add_option("--autostep", action="store_true", default=False)
    op.add_option("-d", "--debug", dest="debug", action="store_true", default=False)
    op.add_option("--kickstart", dest="ksfile")
    op.add_option("--rescue", dest="rescue", action="store_true", default=False)
    op.add_option("--targetarch", dest="targetArch", nargs=1, type="string")

    op.add_option("-m", "--method", dest="method", default=None)
    op.add_option("--repo", dest="method", default=None)
    op.add_option("--stage2", dest="stage2", default=None)
    op.add_option("--noverifyssl", action="store_true", default=False)

    op.add_option("--liveinst", action="store_true", default=False)

    # Display
    op.add_option("--headless", dest="isHeadless", action="store_true", default=False)
    op.add_option("--nofb")
    op.add_option("--resolution", dest="runres", default=None)
    op.add_option("--serial", action="store_true", default=False)
    op.add_option("--usefbx", dest="xdriver", action="store_const", const="fbdev")
    op.add_option("--virtpconsole")
    op.add_option("--vnc", action="store_true", default=False)
    op.add_option("--vncconnect")
    op.add_option("--xdriver", dest="xdriver", action="store", type="string", default=None)

    # Language
    op.add_option("--keymap")
    op.add_option("--kbdtype")
    op.add_option("--lang")

    # Obvious
    op.add_option("--loglevel")
    op.add_option("--syslog")

    op.add_option("--noselinux", dest="selinux", action="store_false", default=True)
    op.add_option("--selinux", action="store_true")

    op.add_option("--nompath", dest="mpath", action="store_false", default=True)
    op.add_option("--mpath", action="store_true")

    op.add_option("--nodmraid", dest="dmraid", action="store_false", default=True)
    op.add_option("--dmraid", action="store_true")

    op.add_option("--noibft", dest="ibft", action="store_false", default=True)
    op.add_option("--ibft", action="store_true")
    op.add_option("--noiscsi", dest="iscsi", action="store_false", default=False)
    op.add_option("--iscsi", action="store_true")

    # Miscellaneous
    op.add_option("--module", action="append", default=[])
    op.add_option("--nomount", dest="rescue_nomount", action="store_true", default=False)
    op.add_option("--updates", dest="updateSrc", action="store", type="string")
    op.add_option("--dogtail", dest="dogtail",   action="store", type="string")
    op.add_option("--dlabel", action="store_true", default=False)

    # Deprecated, unloved, unused
    op.add_option("-r", "--rootPath", dest="unsupportedMode",
                  action="store_const", const="root path")
    op.add_option("-t", "--test", dest="unsupportedMode",
                  action="store_const", const="test")

    return op.parse_args(argv)

def setupPythonPath():
    sys.path.append('/usr/share/system-config-date')

def setupEnvironment():
    # Silly GNOME stuff
    if os.environ.has_key('HOME') and not os.environ.has_key("XAUTHORITY"):
        os.environ['XAUTHORITY'] = os.environ['HOME'] + '/.Xauthority'
    os.environ['HOME'] = '/tmp'
    os.environ['LC_NUMERIC'] = 'C'
    os.environ["GCONF_GLOBAL_LOCKS"] = "1"

    # In theory, this gets rid of our LVM file descriptor warnings
    os.environ["LVM_SUPPRESS_FD_WARNINGS"] = "1"

    # make sure we have /sbin and /usr/sbin in our path
    os.environ["PATH"] += ":/sbin:/usr/sbin"

    # we can't let the LD_PRELOAD hang around because it will leak into
    # rpm %post and the like.  ick :/
    if os.environ.has_key("LD_PRELOAD"):
        del os.environ["LD_PRELOAD"]

    os.environ["GLADEPATH"] = "/tmp/updates/:/tmp/updates/ui/:ui/:/usr/share/anaconda/ui/:/usr/share/python-meh/"
    os.environ["PIXMAPPATH"] = "/tmp/updates/pixmaps/:/tmp/updates/:/tmp/product/pixmaps/:/tmp/product/:pixmaps/:/usr/share/anaconda/pixmaps/:/usr/share/pixmaps/:/usr/share/anaconda/:/usr/share/python-meh/:/usr/share/icons/Fedora/48x48/apps/"

def setupLoggingFromOpts(opts):
    if opts.loglevel and anaconda_log.logLevelMap.has_key(opts.loglevel):
        level = anaconda_log.logLevelMap[opts.loglevel]
        anaconda_log.logger.tty_loglevel = level
        anaconda_log.setHandlersLevel(log, level)
        anaconda_log.setHandlersLevel(storage.storage_log.logger, level)

    if opts.syslog:
        anaconda_log.logger.remote_syslog = opts.syslog

# ftp installs pass the password via a file in /tmp so
# ps doesn't show it
def expandFTPMethod(str):
    ret = None

    try:
        filename = str[1:]
        ret = open(filename, "r").readline()
        ret = ret[:len(ret) - 1]
        os.unlink(filename)
        return ret
    except:
        return None

def runVNC():
    global vncS
    vncS.startServer()

    child = os.fork()
    if child == 0:
        for p in ('/tmp/updates/pyrc.py', \
                '/usr/share/anaconda/pyrc.py'):
            if os.access(p, os.R_OK|os.X_OK):
                os.environ['PYTHONSTARTUP'] = p
                break

        while True:
            # Not having a virtual terminal or otherwise free console
            # are the only places we /really/ need a shell on tty1,
            # and everywhere else this just gets in the way of pdb.  But we
            # don't want to return, because that'll return try to start X
            # a second time.
            if iutil.isConsoleOnVirtualTerminal() or iutil.isS390():
                    time.sleep(10000)
            else:
                    print _("Press <enter> for a shell")
                    sys.stdin.readline()
                    iutil.execConsole()

def check_memory(anaconda, opts, display_mode=None):

    if not display_mode:
        display_mode = anaconda.displayMode

    extra_ram = 0
    reason = ''
    if opts.stage2 and opts.stage2.startswith(('http', 'ftp', '@')):
        extra_ram += isys.URL_INSTALL_EXTRA_RAM
        reason = " using this install method"

    total_ram = isys.total_memory()

    needed_ram = isys.MIN_RAM + extra_ram
    if needed_ram > total_ram:
        from snack import SnackScreen, ButtonChoiceWindow
        screen = SnackScreen()
        ButtonChoiceWindow(screen, _('Fatal Error'),
                            _('You do not have enough RAM to install %s '
                              'on this machine%s.\n'
                              '\n'
                              'Press <return> to reboot your system.\n')
                           %(product.productName, reason),
                           buttons = (_("OK"),))
        screen.finish()
        sys.exit(0)

    # override display mode if machine cannot nicely run X
    if display_mode not in ('t', 'c') and not flags.usevnc:
        needed_ram += isys.GUI_INSTALL_EXTRA_RAM

        if needed_ram > total_ram:
            complain = _("You do not have enough RAM to use the graphical "
                         "installer.")
            if flags.livecdInstall:
                stdoutLog.warning(complain)
                recommendation = _("Try the text mode installer by running:\n\n"
                                   "'/usr/bin/liveinst -T'\n\n from a root "
                                   "terminal.")
                title = _("Not enough RAM")
                text = "%s %s" %(complain, recommendation)
                import gtk
                dialog = gtk.MessageDialog(type = gtk.MESSAGE_ERROR, 
                                           buttons = gtk.BUTTONS_CLOSE,
                                           message_format=text)
                dialog.set_title(title)
                dialog.run()
                sys.exit(1)
            else:
                resolution = _("Starting text mode.")
                stdoutLog.warning("%s %s" % (complain, resolution))
                anaconda.displayMode = 't'
                time.sleep(2)

def setupGraphicalLinks():
    for i in ( "imrc", "im_palette.pal", "gtk-2.0", "pango", "fonts",
               "fb.modes"):
        try:
            if os.path.exists("/mnt/runtime/etc/%s" %(i,)):
                os.symlink ("../mnt/runtime/etc/" + i, "/etc/" + i)
        except:
            pass

def handleSshPw(anaconda):
    if not anaconda.ksdata:
        return

    from pyanaconda import users
    u = users.Users(anaconda)

    userdata = anaconda.ksdata.sshpw.dataList()
    for ud in userdata:
        if u.checkUserExists(ud.username, root="/"):
            u.setUserPassword(username=ud.username, password=ud.password,
                              isCrypted=ud.isCrypted, lock=ud.lock)
        else:
            u.createUser(name=ud.username, password=ud.password,
                         isCrypted=ud.isCrypted, lock=ud.lock,
                         root="/", mkmailspool=False)

    del u

def createSshKey(algorithm, keyfile):
    path = '/etc/ssh/%s' % (keyfile,)
    argv = ['-q','-t',algorithm,'-f',path,'-C','','-N','']
    log.info("running \"%s\"" % (" ".join(['ssh-keygen']+argv),))

    so = "/tmp/ssh-keygen-%s-stdout.log" % (algorithm,)
    se = "/tmp/ssh-keygen-%s-stderr.log" % (algorithm,)
    iutil.execWithRedirect('ssh-keygen', argv, stdout=so, stderr=se)

def fork_orphan():
    """Forks an orphan.
    
    Returns 1 in the parent and 0 in the orphaned child.
    """
    intermediate = os.fork()
    if not intermediate:
        if os.fork():
            # the intermediate child dies
            os._exit(0)
        return 0;
    # the original process waits for the intermediate child
    os.waitpid(intermediate, 0)
    return 1

def startSsh():
    if iutil.isS390():
        return

    if not fork_orphan():
        os.mkdir("/var/log", 0755)
        os.open("/var/log/lastlog", os.O_RDWR | os.O_CREAT, 0644)
        ssh_keys = {
            'rsa1':'ssh_host_key',
            'rsa':'ssh_host_rsa_key',
            'dsa':'ssh_host_dsa_key',
            }
        for (algorithm, keyfile) in ssh_keys.items():
            createSshKey(algorithm, keyfile)
        args = ["/sbin/sshd", "-f", "/etc/ssh/sshd_config.anaconda"]
        os.execv("/sbin/sshd", args)
        sys.exit(1)

def startDebugger(signum, frame):
    import epdb
    epdb.serve(skip=1)

if __name__ == "__main__":
    setupPythonPath()

    # Allow a file to be loaded as early as possible
    try:
        import updates_disk_hook
    except ImportError:
        pass

    # this handles setting up updates for pypackages to minimize the set needed
    setupPythonUpdates()

    # Set up logging as early as possible.
    import logging
    from pyanaconda import anaconda_log
    anaconda_log.init()

    log = logging.getLogger("anaconda")
    stdoutLog = logging.getLogger("anaconda.stdout")

    if os.geteuid() != 0:
        stdoutLog.error("anaconda must be run as root.")
        sys.exit(0)

    # pull this in to get product name and versioning
    from pyanaconda import product

    from pyanaconda import isys
    isys.initLog()

    import signal, string, time
    import warnings

    from pyanaconda import iutil
    from pyanaconda import vnc
    from pyanaconda import users
    from pyanaconda import kickstart
    import pyanaconda.storage.storage_log

    from pyanaconda.flags import flags

    # the following makes me very sad. -- katzj
    # we have a slightly different set of udev rules in the second 
    # stage than the first stage.  why this doesn't get picked up
    # automatically, I don't know.  but we need to trigger so that we
    # have all the information about netdevs that we care about for 
    # NetworkManager in the udev database
    from pyanaconda.baseudev import udev_trigger, udev_settle
    udev_trigger("net")
    udev_settle()
    # and for added fun, once doesn't seem to be enough?  so we 
    # do it twice, it works and we scream at the world "OH WHY?"
    udev_trigger("net")
    udev_settle()

    import gettext
    _ = lambda x: gettext.ldgettext("anaconda", x)

    from pyanaconda import Anaconda
    anaconda = Anaconda()
    warnings.showwarning = AnacondaShowWarning
    iutil.setup_translations(gettext)

    # reset python's default SIGINT handler
    signal.signal(signal.SIGINT, signal.SIG_DFL)
    signal.signal(signal.SIGSEGV, isys.handleSegv)

    setupEnvironment()

    pidfile = open("/var/run/anaconda.pid", "w")
    pidfile.write("%s\n" % (os.getpid(),))
    del pidfile
    # add our own additional signal handlers
    signal.signal(signal.SIGHUP, startDebugger)

    # we need to do this really early so we make sure its done before rpm
    # is imported
    iutil.writeRpmPlatform()

    graphical_failed = 0
    vncS = vnc.VncServer()          # The vnc Server object.
    vncS.anaconda = anaconda
    xserver_pid = None

    (opts, args) = parseOptions()

    # check memory, just the text mode for now:
    check_memory(anaconda, opts, 't')

    if opts.unsupportedMode:
        stdoutLog.error("Running anaconda in %s mode is no longer supported." % opts.unsupportedMode)
        sys.exit(0)

    # Now that we've got arguments, do some extra processing.
    setupLoggingFromOpts(opts)

    # Default is to prompt to mount the installed system.
    anaconda.rescue_mount = not opts.rescue_nomount

    if opts.dlabel: #autodetected driverdisc in use
        flags.dlabel = True

    anaconda.displayMode = opts.display_mode
    anaconda.isHeadless = opts.isHeadless

    if opts.noipv4:
        flags.useIPv4 = False

    if opts.noipv6:
        flags.useIPv6 = False

    if opts.proxy:
        anaconda.proxy = opts.proxy

        if opts.proxyAuth:
            filename = opts.proxyAuth
            ret = open(filename, "r").readlines()
            os.unlink(filename)

            anaconda.proxyUsername = ret[0].rstrip()
            if len(ret) == 2:
                anaconda.proxyPassword = ret[1].rstrip()

    if opts.updateSrc:
        anaconda.updateSrc = opts.updateSrc

    if opts.method:
        if opts.method[0] == '@':
            opts.method = expandFTPMethod(opts.method)

        anaconda.setMethodstr(opts.method)
    else:
        anaconda.methodstr = None

    if opts.stage2:
        if opts.stage2[0] == '@':
            opts.stage2 = expandFTPMethod(opts.stage2)

        anaconda.stage2 = opts.stage2

    if opts.noverifyssl:
        flags.noverifyssl = True

    if opts.liveinst:
        flags.livecdInstall = True

    if opts.module:
        for mod in opts.module:
            (path, name) = string.split(mod, ":")
            anaconda.extraModules.append((path, name))

    if opts.vnc:
        flags.usevnc = 1
        anaconda.displayMode = 'g'
        vncS.recoverVNCPassword()

        # Only consider vncconnect when vnc is a param
        if opts.vncconnect:
            cargs = string.split(opts.vncconnect, ":")
            vncS.vncconnecthost = cargs[0]
            if len(cargs) > 1 and len(cargs[1]) > 0:
                if len(cargs[1]) > 0:
                    vncS.vncconnectport = cargs[1]

    if opts.ibft:
        flags.ibft = 1

    if opts.iscsi:
        flags.iscsi = 1

    if opts.targetArch:
        flags.targetarch = opts.targetArch

    # set flags 
    flags.dmraid = opts.dmraid
    flags.mpath = opts.mpath
    flags.selinux = opts.selinux

    if opts.serial:
        flags.serial = True
    if opts.virtpconsole:
        flags.virtpconsole = opts.virtpconsole

    if opts.xdriver:
        anaconda.xdriver = opts.xdriver
        anaconda.writeXdriver(root="/")

    if not flags.livecdInstall:
        startAuditDaemon()

    # setup links required for all install types
    for i in ( "services", "protocols", "nsswitch.conf", "joe", "selinux",
               "mke2fs.conf" ):
        try:
            if os.path.exists("/mnt/runtime/etc/" + i):
                os.symlink ("../mnt/runtime/etc/" + i, "/etc/" + i)
        except:
            pass

    # This is the one place we do all kickstart file parsing.
    if opts.ksfile:
        kickstart.preScriptPass(anaconda, opts.ksfile)
        anaconda.ksdata = kickstart.parseKickstart(anaconda, opts.ksfile)
        opts.rescue = opts.rescue or anaconda.ksdata.rescue.rescue

    if flags.sshd:
        # we need to have a libuser.conf that points to the installer root for
        # sshpw, but after that we start sshd, we need one that points to the
        # install target.
        luserConf = users.createLuserConf(instPath="")
        handleSshPw(anaconda)
        startSsh()
        del(os.environ["LIBUSER_CONF"])

    users.createLuserConf(anaconda.rootPath)

    if opts.rescue:
        anaconda.rescue = True

        from pyanaconda import rescue

        if anaconda.ksdata:
            anaconda.instClass.configure(anaconda)

            # We need an interface before running kickstart execute methods for
            # storage.
            from snack import *
            screen = SnackScreen()
            anaconda.intf = rescue.RescueInterface(screen)

            anaconda.ksdata.execute()

            anaconda.intf = None
            screen.finish()

            # command line 'nomount' overrides kickstart /same for vnc/
            anaconda.rescue_mount = not (opts.rescue_nomount or anaconda.ksdata.rescue.nomount)

        rescue.runRescue(anaconda)

        # shouldn't get back here
        sys.exit(1)

    if anaconda.ksdata:
        if anaconda.ksdata.vnc.enabled:
            flags.usevnc = 1
            anaconda.displayMode = 'g'

            if vncS.password == "":
                vncS.password = anaconda.ksdata.vnc.password

            if vncS.vncconnecthost == "":
                vncS.vncconnecthost = anaconda.ksdata.vnc.host

            if vncS.vncconnectport == "":
                vncS.vncconnectport = anaconda.ksdata.vnc.port

        flags.vncquestion = False

    # disable VNC over text question when not enough memory is available
    if iutil.memInstalled() < isys.MIN_GUI_RAM:
        flags.vncquestion = False

    if os.environ.has_key('DISPLAY'):
        flags.preexisting_x11 = True

    if anaconda.displayMode == 't' and flags.vncquestion: #we prefer vnc over text mode, so ask about that
        title = _("Would you like to use VNC?")
        message = _("Text mode provides a limited set of installation options.  "
                    "It does not allow you to specify your own partitioning "
                    "layout or package selections.  Would you like to use VNC "
                    "mode instead?")

        ret = vnc.askVncWindow(title, message)
        if ret != -1:
            anaconda.displayMode = 'g'
            flags.usevnc = 1
            if ret is not None:
                vncS.password = ret

    if opts.debug:
        flags.debug = True

    log.info("anaconda called with cmdline = %s" %(sys.argv,))
    log.info("Display mode = %s" % anaconda.displayMode)
    log.info("Default encoding = %s " % sys.getdefaultencoding())

    check_memory(anaconda, opts)

    #
    # now determine if we're going to run in GUI or TUI mode
    #
    # if no X server, we have to use text mode
    if not flags.livecdInstall and not iutil.isS390() and not os.access("/usr/bin/Xorg", os.X_OK):
         stdoutLog.warning(_("Graphical installation is not available. "
                             "Starting text mode."))
         time.sleep(2)
         anaconda.displayMode = 't'

    # s390/iSeries checks
    if anaconda.isHeadless and anaconda.displayMode == "g" and not \
       (flags.preexisting_x11 or flags.usevnc):
        stdoutLog.warning(_("DISPLAY variable not set. Starting text mode."))
        anaconda.displayMode = 't'
        graphical_failed = 1
        time.sleep(2)

    # if DISPLAY not set either vnc server failed to start or we're not
    # running on a redirected X display, so start local X server
    if anaconda.displayMode == 'g' and not flags.preexisting_x11 and not flags.usevnc:
        try:
            # The following code depends on no SIGCHLD being delivered, possibly
            # only except the one from a failing X.org. Thus make sure before
            # entering this section that all the other children of anaconda have
            # terminated or were forked into an orphan (which won't deliver a
            # SIGCHLD to mess up the fragile signaling below).

            # start X with its USR1 handler set to ignore.  this will make it send
            # us SIGUSR1 if it succeeds.  if it fails, catch SIGCHLD and bomb out.

            def sigchld_handler(num, frame):
                raise OSError(0, "SIGCHLD caught when trying to start the X server.")

            def sigusr1_handler(num, frame):
                log.debug("X server has signalled a successful start.")

            def preexec_fn():
                signal.signal(signal.SIGUSR1, signal.SIG_IGN)

            old_sigusr1 = signal.signal(signal.SIGUSR1, sigusr1_handler)
            old_sigchld = signal.signal(signal.SIGCHLD, sigchld_handler)
            xout = open("/dev/tty5", "w")

            proc = subprocess.Popen(["Xorg", "-br", "-logfile", "/tmp/X.log",
                                     ":1", "vt6", "-s", "1440", "-ac",
                                     "-nolisten", "tcp", "-dpi", "96"],
                                     close_fds=True, stdout=xout, stderr=xout,
                                     preexec_fn=preexec_fn)

            signal.pause()

            os.environ["DISPLAY"] = ":1"
            doStartupX11Actions()
            xserver_pid = proc.pid
        except (OSError, RuntimeError) as e:
            stdoutLog.warning(" X startup failed, falling back to text mode")
            anaconda.displayMode = 't'
            graphical_failed = 1
            time.sleep(2)
        finally:
            signal.signal(signal.SIGUSR1, old_sigusr1)
            signal.signal(signal.SIGCHLD, old_sigchld)

    set_x_resolution(opts.runres)

    if anaconda.displayMode == 't' and graphical_failed and not anaconda.ksdata:
        ret = vnc.askVncWindow()
        if ret != -1:
            anaconda.displayMode = 'g'
            flags.usevnc = 1
            if ret is not None:
                vncS.password = ret

    # if they want us to use VNC do that now
    if anaconda.displayMode == 'g' and flags.usevnc:
        runVNC()
        doStartupX11Actions()

    # with X running we can initialize the UI interface
    anaconda.initInterface()
    anaconda.instClass.configure(anaconda)

    # comment out the next line to make exceptions non-fatal
    from pyanaconda.exception import initExceptionHandling
    anaconda.mehConfig = initExceptionHandling(anaconda)

    # add our own additional signal handlers
    signal.signal(signal.SIGUSR2, lambda signum, frame: anaconda.dumpState())

    # download and run Dogtail script
    if opts.dogtail:
       try:
           import urlgrabber

           try:
               fr = urlgrabber.urlopen(opts.dogtail)
           except urlgrabber.grabber.URLGrabError, e:
               log.error("Could not retrieve Dogtail script from %s.\nError was\n%s" % (opts.dogtail, e))
               fr = None
                           
           if fr:
               (fw, testcase) = mkstemp(prefix='testcase.py.', dir='/tmp')
               os.write(fw, fr.read())
               fr.close()
               os.close(fw)
               
               # download completed, run the test
               if not os.fork():
                   # we are in the child
                   os.chmod(testcase, 0755)
                   os.execv(testcase, [testcase])
                   sys.exit(0)
               else:
                   # we are in the parent, sleep to give time for the testcase to initialize
                   # todo: is this needed, how to avoid possible race conditions
                   time.sleep(1)
       except Exception, e:
           log.error("Exception %s while running Dogtail testcase" % e)

    if opts.lang:
        # this is lame, but make things match what we expect (#443408)
        opts.lang = opts.lang.replace(".utf8", ".UTF-8")
        anaconda.dispatch.skipStep("language", permanent = 1)
        anaconda.instLanguage.instLang = opts.lang
        anaconda.instLanguage.systemLang = opts.lang
        anaconda.timezone.setTimezoneInfo(anaconda.instLanguage.getDefaultTimeZone(anaconda.rootPath))

    if opts.keymap:
        anaconda.dispatch.skipStep("keyboard", permanent = 1)
        anaconda.keyboard.set(opts.keymap)
        anaconda.keyboard.activate()

    if anaconda.ksdata:
        from pyanaconda import storage
        storage.storageInitialize(anaconda)

        # Now having initialized storage, we can apply all the other kickstart
        # commands.  This gives us the ability to check that storage commands
        # are correctly formed and refer to actual devices.
        anaconda.ksdata.execute()

    # set up the headless case
    if anaconda.isHeadless:
        anaconda.dispatch.skipStep("keyboard", permanent = 1)

    if not anaconda.ksdata:
        anaconda.instClass.setSteps(anaconda)
    else:
        kickstart.setSteps(anaconda)

    try:
        anaconda.intf.run(anaconda)
    except SystemExit, code:
        anaconda.intf.shutdown()

    if anaconda.ksdata and anaconda.ksdata.reboot.eject:
        for drive in anaconda.storage.devicetree.devices:
            if drive.type != "cdrom":
                continue

            log.info("attempting to eject %s" % drive.path)
            drive.eject()

    del anaconda.intf

# vim:tw=78:ts=4:et:sw=4