#!/bin/sh

# $Xorg: startx.cpp,v 1.3 2000/08/17 19:54:29 cpqbld Exp $
#
# This is just a sample implementation of a slightly less primitive
# interface than xinit.  It looks for user .xinitrc and .xserverrc
# files, then system xinitrc and xserverrc files, else lets xinit choose
# its default.  The system xinitrc should probably do things like check
# for .Xresources files and merge them in, startup up a window manager,
# and pop a clock and serveral xterms.
#
# Site administrators are STRONGLY urged to write nicer versions.
#
# $XFree86: xc/programs/xinit/startx.cpp,v 3.16tsi Exp $

# These files (if they exist) are used to set up the X related environment. We used to
# exec .xsession at this location, but that can interfere with choosing a session type
# through XDM/KDM/GDM so it was moved to after a requested session is started. Since
# that means that .xsession might never be run at all when using XDM/KDM/GDM, support
# for the xprofile was added to allow a way for the user to customize the X environment.
#if [ -r /etc/xprofile ] ; then
#	. /etc/xprofile
#fi
#if [ -r $HOME/.xprofile ] ; then
#	. $HOME/.xprofile
#fi

userclientrc=$HOME/.xinitrc
userserverrc=$HOME/.xserverrc
sysclientrc=/etc/X11/xinit/xinitrc
sysserverrc=/etc/X11/xinit/xserverrc
defaultclient=/usr/bin/xterm
defaultserver=/usr/bin/X
defaultclientargs=""
defaultserverargs=""
clientargs=""
# be sure to sync the following line with the kde kdmrc
# serverargs="-dpi 120 -ac -nolisten tcp -logverbose 6"
serverargs="-dpi 120 -ac -nolisten tcp"

# if in an ssh session then stop right now
if [ -n "$SSH_CONNECTION" ] ; then
	echo -e "${BOLDRED}You can't run X from within an SSH session. Exiting.${COLOR_RESET}"
	exit 1
fi

echo

# Create_Date_String
# Initialize_Status_Message startx

# Programmatically assign $DISPLAY to next available session.
DISPLAY=0
while [ -e "/tmp/.X${DISPLAY}-lock" ] ; do
	DISPLAY=$(( $DISPLAY + 1 ))
done

# Select one of the following schemes. The VT variable will be used to
# determine the virtual terminal (vt) number and also and inform the user
# of the respective Ctrl-Alt-Fn keyboard shortcut.

# Scheme One:
# Calculate the vt the same way as X. Determine the number of available tty
# consoles and then add 1. Later in the script when launching X from xinit,
# the vt assignment will coincide as to what X normally would have assigned anyway.
# In other words, no damage done and no confusion to X. But determining the VT
# variable at this stage also helps inform the user of the Ctrl-Alt-Fn keyboard
# shortcut.
# NUMTTY=?
# VT=$(($NUMTTY+1))

# Scheme Two:
# Unless specifically instructed, X assigns the first vt number in sequence
# with the number of tty consoles. If 3 tty consoles are enabled in
# /etc/inittab, then X assigns the next vt to vt4. Most people never reduce
# the six tty consoles that most distros provide in /etc/inittab. But even
# if inittab is modified for fewer than 6 tty consoles, the following routine
# ensures the Ctrl-Alt-Fn keyboard shortcut remains consistent as if we still
# had the original 6. Therefore we increment the next display number by 7
# to force the vt number. If choosing this option, and using XDM or KDM as
# login managers, be sure to also edit the respective Xsession config files to
# forcibly assign the vt consistent with this scheme. The tty number could be
# used here, but using the DISPLAY variable creates a nice correspondence with
# the function keys. That is, regardless of which tty X is launched from, the
# function keys remain consistent with the DISPLAY number. Thus, Display 0 will
# always be assigned vt7, Display 1 to vt8, Display 2 to vt9, etc.
VT=$(($DISPLAY+7))

# Scheme Three:
# Similar to the previous two schemes, we calculate the vt number using the ttys, but
# instead of incrementing by 1, we increment by 7. This schemed keeps the vt number
# consistent with the tty. That is, from tty1 we use vt7, tty2 we use vt8, etc.
# NUMTTY=?
# VT=$(($NUMTTY+7))

echo "Using X session DISPLAY: ${DISPLAY}"
echo "Using virtual terminal: vt$VT$"
echo "Use (Ctrl-Alt-F$VT) to toggle to this virtual terminal."

if [ -f $userclientrc ] ; then
    defaultclientargs=$userclientrc
elif [ -f $sysclientrc ] ; then
    defaultclientargs=$sysclientrc
fi

if [ -f $userserverrc ] ; then
    defaultserverargs=$userserverrc
elif [ -f $sysserverrc ] ; then
    defaultserverargs=$sysserverrc
fi

whoseargs="client"
while [ x"$1" != x ] ; do
    case "$1" in
		# '' required to prevent cpp from treating "/*" as a C comment.
		/''*|\./''*)
			if [ "$whoseargs" = "client" ] ; then
				if [ x"$clientargs" = x ] ; then
					client="$1"
				else
					clientargs="$clientargs $1"
				fi
			else
				if [ x"$serverargs" = x ] ; then
					server="$1"
				else
					serverargs="$serverargs $1"
				fi
			fi
		;;
		--)	whoseargs="server" ;;
		*)
			if [ "$whoseargs" = "client" ] ; then
				clientargs="$clientargs $1"
			else
				# display must be the FIRST server argument
				if [ x"$serverargs" = x ] && \
					expr "$1" : ':[0-9][0-9]*$' > /dev/null 2>&1; then
					display="$1"
				else
					serverargs="$serverargs $1"
				fi
			fi
		;;
    esac
    shift
done

# process client arguments
if [ x"$client" = x ] ; then
	# if no client arguments either, use rc file instead
	if [ x"$clientargs" = x ] ; then
		client="$defaultclientargs"
	else
		client=$defaultclient
	fi
fi

# process server arguments
if [ x"$server" = x ] ; then
	# if no server arguments or display either, use rc file instead
	if [ x"$serverargs" = x -a x"$DISPLAY" = x ] ; then
		server="$defaultserverargs"
	else
		server=$defaultserver
	fi
fi

if [ x"$XAUTHORITY" = x ] ; then
	XAUTHORITY=$HOME/.Xauthority
	export XAUTHORITY
fi

removelist=

# set up default Xauth info for this machine
case `uname` in
	Linux*)
		if [ -z "`hostname --version 2>&1 | grep GNU`" ] ; then
			hostname=`hostname -f`
		else
			hostname=`hostname`
		fi
	;;
	*)
		hostname=`hostname`
	;;
esac

#authdisplay=${display:-:0}
authdisplay=${display:-:$DISPLAY}
mcookie=`mcookie`
dummy=0

# create a file with auth information for the server. ':0' is a dummy.
# xserverauthfile=$HOME/.serverauth.$$
# xserverauthfile=$XAUTHORITY
# we don't like the per-process ($$) usage above as
# it fills up the users $HOME with auth files.
xserverauthfile=$HOME/.Xserverauth
rm -f $xserverauthfile
xauth -q -f $xserverauthfile 2>/dev/null add :$dummy . $mcookie
# serverargs=${serverargs}" -auth "${xserverauthfile}

# now add the same credentials to the client authority file
# if '$displayname' already exists don't overwrite it as another
# server may need it. Add them to the '$xserverauthfile' instead.
for displayname in $authdisplay $hostname$authdisplay; do
	authcookie=`/usr/bin/xauth list "$displayname" \
		| sed -n "s/.*$displayname[[:space:]*].*[[:space:]*]//p"` 2>/dev/null;
	if [ "z${authcookie}" = "z" ] ; then
		/usr/bin/xauth -q add $displayname . $mcookie
		removelist="$displayname $removelist"
	else
		dummy=$((dummy+1));
		/usr/bin/xauth -q -f $xserverauthfile add :$dummy . $authcookie
	fi
done

xinit $client $clientargs -- $server :$DISPLAY vt$VT $serverargs 2>/dev/null

if [ "$?" != "0" ] ; then
	echo
	echo "startx: Error! Could not start the X graphical environment!"
	echo "Client args: $client $clientargs"
	echo "Server args: $server :$DISPLAY vt$VT $serverargs"
fi

if [ x"$removelist" != x ] ; then
	/usr/bin/xauth remove $removelist
fi
if [ x"$xserverauthfile" != x ] ; then
	rm -f $xserverauthfile
fi

if command -v deallocvt > /dev/null 2>&1; then
	deallocvt
fi