#!/bin/sh
# Depend on the ldm package
#
# Copyright 2005, Canonical Ltd.
# Copyright 2006-2008 Vagrant Cascadian
#
# 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, 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 with your
# Debian GNU system, in /usr/share/common-licenses/GPL.  If not, write to the
# Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
# 02111-1307, USA.

#
# Load code common to X based screen scripts
#

# NOTE: The while loop has been moved into screen_session (the parent script
# to this one.  MAKE SURE YOU HAVE THE LATEST ltsp-trunk

trap cleanup 0 INT QUIT TERM

cleanup()
{
    if [ -d "${XAUTHORITY_DIR}" ]; then
        rm -Rf "${XAUTHORITY_DIR}"
    fi

    if [ -f "${XAUTHORITY}" ]; then
        rm -f "${XAUTHORITY}"
    fi

    if [ -f "/tmp/.X${TTY}-lock" ]; then
        rm -f "/tmp/.X${TTY}-lock"
    fi

    if [ -S "/tmp/.X11-unix/X${TTY}" ]; then
        rm -f "/tmp/.X11-unix/X${TTY}"
    fi
}

. /usr/share/ltsp/screen-x-common
# backwards compatibility: set DISPLAY from old DISP variable
test -z "$DISPLAY" && DISPLAY="$DISP"
XAUTHORITY_DIR=`mktemp -d /var/run/ldm-xauth-XXXXXXXXX`
export XAUTHORITY_DIR
XAUTHORITY="${XAUTHORITY_DIR}/Xauthority"
touch $XAUTHORITY
export XAUTHORITY

SESSIONLIST="/etc/X11/xinit/Xsession \
             /etc/X11/Xsession \
             /usr/lib/X11/xdm/Xsession \
             /etc/X11/xdm/Xsession"

if [ -z "$LDM_LOGIN_TIMEOUT" ] && [ -n "$LDM_TIMEOUT_TIME" ] && [ -n "$LDM_TIMEOUT_ENABLED" ]; then
    # implement backwards compatibility with short-lived timeout login options
    if boolean_is_true "$LDM_TIMEOUT_ENABLED" ; then
        LDM_LOGIN_TIMEOUT="$LDM_TIMEOUT_TIME"
    fi
fi

#
# Server scalability.  If there exists a /usr/share/ltsp/get_hosts file, then
# use it to populate the LDM_SERVER environment variable.
#

if [ -z "${LDM_SERVER}" ]; then
    if [ -x /usr/share/ltsp/get_hosts ]; then
        LDM_SERVER=$(/usr/share/ltsp/get_hosts)
    else
        LDM_SERVER=${SERVER}
    fi
fi
export LDM_SERVER

#
# Loop though each of the hosts, and get their ldminfo
#

if [ -n "${LDM_SERVER}" ]; then
    test ! -d /var/run/ldm && mkdir -p /var/run/ldm
    for SRV in $LDM_SERVER ; do
        # Write server to /etc/hosts so reverse DNS lookup is not necessary
        if ! grep -q "$SRV" /etc/hosts ; then
            echo "$SRV	server-$SRV" >> /etc/hosts
        fi
        # For this to work, ldm-server needs to be installed in the chroot
        if boolean_is_true "$LTSP_FATCLIENT" && [ -x /usr/share/ldm/ldminfod ]; then
            /usr/share/ldm/ldminfod > /var/run/ldm/$SRV
            break
        else
            nc $nc_q_param -w 5 $SRV 9571 > /var/run/ldm/$SRV
        fi
    done
fi

get_xfs_settings "$LDM_SERVER"

MCOOKIE=$(mcookie)
if [ -z "${MCOOKIE}" ]; then
    echo "Couldn't create cookie"
    exit 1
fi

# FIXME: This needs to non-destructively operate  in parallel with other
# X servers running on the same machine.  See /usr/bin/startx for example.
xauth -q add ${DISPLAY} . ${MCOOKIE} 2>/dev/null
# Might not be necessary to do these...
xauth -q add `hostname`${DISPLAY} . ${MCOOKIE} 2>/dev/null
xauth -q add 127.0.0.1/unix${DISPLAY} . ${MCOOKIE} 2>/dev/null

# Define our session
if [ -z "${LDM_XSESSION}" ]; then        # If admin hasn't specified session
    for SESSION in ${SESSIONLIST}; do
        if [ -x ${SESSION} ]; then
            export LDM_DEFAULT_XSESSION=${SESSION}
            break
        fi
    done
fi

if [ -x /usr/share/ltsp/xinitrc ]; then
    xinitrc=/usr/share/ltsp/xinitrc
fi

xinit $xinitrc /usr/sbin/ldm -- ${DISPLAY} vt${TTY} -auth ${XAUTHORITY} ${X_ARGS} -br >/dev/null 2>&1