BScreen::BScreen: an error occured while querying the X server.
  another window manager already running on display :0.0.
Blackbox::Blackbox: no managable screens found, aborting.

#!/bin/bash
# Copyright 1999 - 2001 Red Hat, Inc.
# License:  GNU General Public License v2

# check to see if the user has a preferred desktop
PREFERRED=
if [ -f /etc/sysconfig/desktop ]; then
    . /etc/sysconfig/desktop
    if [ "$DESKTOP" = "GNOME" ]; then
	PREFERRED=gnome-session
    elif [ "$DESKTOP" = "KDE" ]; then
	PREFERRED=startkde
    elif [ "$DESKTOP" = "WINDOWMAKER" ]; then
        PREFERRED=wmaker
    fi
fi

if [ -n "$PREFERRED" ] && which $PREFERRED >/dev/null 2>&1; then
    PREFERRED=`which $PREFERRED`
    exec $PREFERRED
fi

# now if we can reach here, either no desktop file was present,
# or the desktop requested is not installed.

if [ -z "$PREFERRED" ]; then
 
    GSESSION=gnome-session
    STARTKDE=startkde
 
    # by default, we run GNOME.
    if which $GSESSION >/dev/null 2>&1; then
	exec `which $GSESSION`
    fi

    # if GNOME isn't installed, try KDE.
    if which $STARTKDE >/dev/null 2>&1; then
	exec `which $STARTKDE`
    fi
fi

# Failsafe.

# these files are left sitting around by TheNextLevel.
rm -f $HOME/Xrootenv.0
rm -f /tmp/fvwmrc* 2>/dev/null

# First thing - check the user preferences
if [ -f $HOME/.wm_style ] ; then
    WMSTYLE=`cat $HOME/.wm_style |tr A-Z a-z`
    case "$WMSTYLE" in 
	afterstep|windowmaker|mmaker)
	exec /usr/X11R6/bin/RunWM --WindowMaker
	;;
	fvwm95|fvwm|fvwm2)
	exec /usr/X11R6/bin/RunWM --Fvwm95
	;;
	mwm|lesstif)
	exec /usr/X11R6/bin/RunWM --FvwmMWM
	;;
    esac
fi

# Argh! Nothing good is installed. Fall back to fvwm2 (win95-style) or twm
/usr/X11R6/bin/RunWM --Fvwm95 || {
    # gosh, neither fvwm95 nor fvwm2 is available; 
    # fall back to failsafe settings
    xclock -geometry 100x100-5+5 &
    xterm -geometry 80x50-50+150 &
    if [ -f /usr/bin/mozilla -a -f /usr/share/doc/HTML/index.html ]; then
	mozilla /usr/share/doc/HTML/index.html &
    fi
    if [ -f /usr/X11R6/bin/fvwm ]; then
	exec fvwm
    else
	exec twm
    fi
}