#!/bin/sh
#
# Quick & dirty LTSP startup script
# Author: Floris Bos
#

case "$1" in
  start)
    export XAUTHORITY=/var/run/Xauthority
    export DISPLAY=:0
    export LOCALE=C
    
    export LDM_THEME=ltsp
    export LANG=en_US.UTF-8
    export LANGUAGE=en_US.UTF-8
    export LDM_LANGUAGE=en_US.UTF-8
    export LDM_DIRECTX=True
    export SOUND=True
    
    # FIXME: should introduce a way to embed keys in image to prevent man-in-the-middle scenario
    export LDM_SSHOPTIONS="-o StrictHostKeyChecking=no -o CheckHostIP=no"

    # FIXME: check if this improves performance on boards other than the RPi. If not do a /proc/cpuinfo check
    export LD_PRELOAD=/usr/lib/libcofi_rpi.so
        
    # LTSP acts as DHCP server.  /usr/share/uhdcpc/default.script has been modified to save server IP in /tmp/siaddr
    LDM_SERVER=`cat /tmp/siaddr`

    # Disable (reverse) DNS lookups
    echo "" >/etc/resolv.conf
   
    # If there is a "server=1.2.3.4" kernel parameter use that instead
    # Allow the default language to be overridden too.
    for x in `cat /proc/cmdline`
    do
        case $x in
            server=*)
            LDM_SERVER=${x//server=}
            ;;
            berryconsole)
            /sbin/getty -L tty2 0 vt100 &
            ;;
            LDM*)
            export $x
            ;;
            LANG=*)
            export LANG=${x//LANG=}
            export LANGUAGE=${x//LANG=}
            export LDM_LANGUAGE=${x//LANG=}
            ;;
        esac
    done
    export LDM_SERVER

    if [ -z "${LDM_SERVER}" ]; then
        echo "Error obtaining IP from DHCP server"
        echo
        exit 1
    fi

    echo "Retrieving LDM settings from ${LDM_SERVER}"
    mkdir /var/run/ldm
    nc -w 5 ${LDM_SERVER} 9571 > /var/run/ldm/${LDM_SERVER}
    
    if [ ! -s /var/run/ldm/${LDM_SERVER} ]; then
        echo "Error retrieving LDM settings from ${LDM_SERVER}. Not a LTSP server?"
        echo
	echo "Note: you can manually specify the LTSP server by putting 'server=1.2.3.4' in cmdline.txt"
	echo
        exit 1
    fi

    echo "Initializing sound"
    if [ -e /lib/modules/`uname -r`/kernel/sound/arm/snd-bcm2835.ko ]; then
	modprobe snd-bcm2835
    fi
    adduser -D -H pulse 2>/dev/null
    chown pulse /dev/snd/*
    pulseaudio --system --exit-idle-time=-1 --disable-shm --no-cpu-limit \
                --resample-method=trivial --high-priority --log-target=syslog \
                -L "module-esound-protocol-tcp auth-ip-acl=${LDM_SERVER}" \
                -L "module-native-protocol-tcp auth-ip-acl=${LDM_SERVER}" &
    
    MCOOKIE=$(mcookie)
    xauth -q add ${DISPLAY} . ${MCOOKIE} 2>/dev/null
    clear
    echo "Starting X"

    while true
    do
        Xorg -auth $XAUTHORITY &
        ldm
        killall Xorg
        clear 
        echo "Restarting X and LDM"
        sleep 1
    done
    ;;

  *)
    exit 0
esac

exit $?