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#!/bin/sh
#
# Copyright © 2002, Valve LLC. All rights reserved.
#
# a wrapper script for the main hl dedicated server binary.
# Performs auto-restarting of the server on crash. You can
# extend this to log crashes and more.
#

# setup the libraries, local dir first!
export LD_LIBRARY_PATH=".:$LD_LIBRARY_PATH"

init() {
# Initialises the various variables
# Set up the defaults
GAME="valve"
DEBUG=0
RESTART="yes"
HL=./hlds_i486
HL_DETECT=1
TIMEOUT=10 # time to wait after a crash (in seconds)
CRASH_DEBUG_MSG="email debug.log to linux@valvesoftware.com"
GDB="gdb" # the gdb binary to run
DEBUG_LOG="debug.log"
PID_FILE=""
STEAM=""
STEAMERR=""
SIGINT_ACTION="quit 0" # exit normally on sig int
NO_TRAP=0
AUTO_UPDATE=""
BETA_VERSION=""
PARAMS=$*

# Remove any old default pid files
# Cant do this as they may be still running
#rm -f hlds.*.pid

# use the $FORCE environment variable if its set
if test -n "$FORCE" ; then
# Note: command line -binary will override this
HL=$FORCE
HL_DETECT=0
fi

while test $# -gt 0; do
case "$1" in
"-game")
GAME="$2"
shift ;;
"-debug")
DEBUG=1
# Ensure that PID_FILE is set
if test -z "$PID_FILE"; then
PID_FILE="hlds.$$.pid"
fi ;;
"-norestart")
RESTART="" ;;
"-pidfile")
PID_FILE="$2"
shift ;;
"-binary")
HL="$2"
HL_DETECT=0
shift ;;
"-timeout")
TIMEOUT="$2"
shift ;;
"-gdb")
GDB="$2"
shift ;;
"-debuglog")
DEBUG_LOG="$2"
shift ;;
"-autoupdate")
AUTO_UPDATE="yes"
STEAM="./steam"
RESTART="yes" ;;
"-steamerr")
STEAMERR=1 ;;
"-ignoresigint")
SIGINT_ACTION="" ;;
"-notrap")
NO_TRAP=1 ;;
"-beta")
BETA_VERSION="$2"
shift ;;
"-help")
# quit with syntax
quit 2
;;
esac
shift
done

# Ensure we have a game specified
if test -z "$GAME"; then
echo "Unable to determine game type from command line."
quit 1
elif test ! -d "$GAME"; then
echo "Invalid game type '$GAME' sepecified."
quit 1
fi

if test 0 -eq "$NO_TRAP"; then
# Set up the int handler
# N.B. Dont use SIGINT symbolic value
# as its just INT under ksh
trap "$SIGINT_ACTION" 2
fi

# Only detect the CPU if it hasnt been set with
# either environment or command line
if test "$HL_DETECT" -eq 1; then
detectcpu
fi

if test ! -f "$HL"; then
echo "Half-life binary '$HL' not found, exiting"
quit 1
elif test ! -x "$HL"; then
# Could try chmod but dont know what we will be
# chmoding so just fail.
echo "Half-life binary '$HL' not executable, exiting"
quit 1
fi

# Setup debugging
if test "$DEBUG" -eq 1; then
#turn on core dumps :) (if possible)
echo "Enabling debug mode"
if test "`ulimit -c`" -eq 0 ; then
ulimit -c 2000
fi
GDB_TEST=`$GDB -v`
if test -z "$GDB_TEST"; then
echo "Please install gdb first."
echo "goto http://www.gnu.org/software/gdb/ "
DEBUG=0 # turn off debugging cause gdb isn't installed
fi
fi

PID_IN_PARAMS="`echo $PARAMS | grep -e -pidfile`"

if test -z "$PID_IN_PARAMS" && test -n "$PID_FILE"; then
HL_CMD="$HL $PARAMS -pidfile $PID_FILE"
else
HL_CMD="$HL $PARAMS"
fi
}

syntax () {
# Prints script syntax

echo "Syntax:"
echo "$0 [-game <game>] [-debug] [-norestart] [-pidfile]"
echo " [-binary [hlds_i486|hlds_i686|hlds_amd]"
echo " [-timeout <number>] [-gdb <gdb>] [-autoupdate]"
echo " [-steamerr] [-ignoresigint] [-beta <version>]"
echo " [-debuglog <logname>]"
echo "Params:"
echo "-game <game> Specifies the <game> to run."
echo "-debug Run debugging on failed servers if possible."
echo "-debuglog <logname> Log debug output to this file."
echo "-norestart Don't attempt to restart failed servers."
echo "-pidfile <pidfile> Use the specified <pidfile> to store the server pid."
echo "-binary <binary> Use the specified binary ( no auto detection )."
echo "-timeout <number> Sleep for <number> seconds before restarting"
echo " a failed server."
echo "-gdb <gdb> Use <dbg> as the debugger of failed servers."
echo "-steamerr Quit on steam update failure."
echo "-beta <version> Make use of a beta version of this server from Steam"
echo "-ignoresigint Ignore signal INT ( prevents CTRL+C quitting"
echo " the script )."
echo "-notrap Don't use trap. This prevents automatic"
echo " removal of old lock files."
echo "Note: All parameters specified as passed through to the server"
echo "including any not listed."
}

debugcore () {
# Debugs any core file if DEBUG is set and
# the exitcode is none 0

exitcode=$1

if test $exitcode -ne 0; then
if test -n "$DEBUG" ; then
echo "bt" > debug.cmds;
echo "info locals" >> debug.cmds;
echo "info sharedlibrary" >> debug.cmds
echo "info frame" >> debug.cmds; # works, but gives an error... must be last
echo "----------------------------------------------" >> $DEBUG_LOG
echo "CRASH: `date`" >> $DEBUG_LOG
echo "Start Line: $HL_CMD" >> $DEBUG_LOG

# check to see if a core was dumped
if test -f core ; then
CORE="core"
elif test -f core.`cat $PID_FILE`; then
CORE=core.`cat $PID_FILE`
elif test -f "$HL.core" ; then
CORE="$HL.core"
fi

if test -n "$CORE"; then
$GDB $HL $CORE -x debug.cmds -batch >> $DEBUG_LOG
fi

echo "End of crash report" >> $DEBUG_LOG
echo "----------------------------------------------" >> $DEBUG_LOG
echo $CRASH_DEBUG_MSG
rm debug.cmds
else
echo "Add \"-debug\" to the $0 command line to generate a debug.log to help with solving this problem"
fi
fi
}

detectcpu() {
# Attempts to auto detect the CPU
echo "Auto detecting CPU"

if test "FreeBSD" = `uname`; then
PROC="/usr/compat/linux/proc"
else
PROC="/proc"
fi

if test -e $PROC/cpuinfo; then
CPU_VERSION="`grep "cpu family" $PROC/cpuinfo | cut -f2 -d":" | tr -d " " | uniq`";
if test $CPU_VERSION -lt 4; then
echo "Error: hlds_l REQUIRES a 486 CPU or better";
quit 1
elif test $CPU_VERSION -ge 15; then
# Core 2 or greater
echo "Using AMD Optimised binary."
HL=./hlds_amd
elif test $CPU_VERSION -ge 6; then
AMD="`grep AMD $PROC/cpuinfo`";
if test -n "$AMD"; then
echo "Using AMD Optimised binary."
HL=./hlds_amd
else
echo "Using Pentium II Optimised binary."

# there is a CPU manufactured by VIA that
# doesn't support some PII instructions...
# detect this.
VIACHIP=`grep CentaurHauls $PROC/cpuinfo`

if test -z "$VIACHIP"; then
HL=./hlds_i686
fi
fi
else
echo "Using default binary."
fi
elif test "FreeBSD" = `uname`; then
CPU="`grep 'CPU:' /var/run/dmesg.boot`"
AMD="`echo $CPU |grep AMD`"
K8="`echo $CPU |grep K8`"
I686="`echo $CPU |grep 686`"
if test -n "$AMD"; then
echo "Using AMD Optimised binary."
HL=./hlds_amd
elif test -n "$K8" ; then
echo "Using AMD Optimised binary."
HL=./hlds_amd
elif test -n "$I686" ; then
echo "Using Pentium II Optimised binary."
HL=./hlds_i686
else
echo "Using default binary."
fi
else
echo "Using default binary."
fi
}

update() {
updatesingle
}

updatesingle() {
# Run the steam update
# exits on failure if STEAMERR is set

if test -n "$AUTO_UPDATE"; then
if test -f "$STEAM"; then
echo "Updating server using Steam."
CMD="$STEAM -command update -game $GAME -dir .";
if test -n "$BETA_VERSION"; then
CMD="$CMD -beta $BETA_VERSION";
fi

$CMD
if test $? -ne 0; then
if test -n "$STEAMERR"; then
echo "`date`: Steam Update failed, exiting."
quit 1
else
echo "`date`: Steam Update failed, ignoring."
return 0
fi
fi
else
if test -n "$STEAMERR"; then
echo "Could not locate steam binary:$STEAM, exiting.";
quit 1
else
echo "Could not locate steam binary:$STEAM, ignoring.";
return 0
fi
fi
fi

return 1
}

run() {
# Runs the steam update and server
# Loops if RESTART is set
# Debugs if server failure is detected
# Note: if RESTART is not set then
# 1. DEBUG is set then the server is NOT exec'd
# 2. DEBUG is not set the the server is exec'd

if test -n "$RESTART" ; then
echo "Auto-restarting the server on crash"

#loop forever
while true
do
# Update if needed
update

# Run the server
$HL_CMD
retval=$?
if test $retval -eq 0 && test -z "$AUTO_UPDATE"; then
break; # if 0 is returned then just quit
fi

debugcore $retval

echo "`date`: Server restart in $TIMEOUT seconds"

# don't thrash the hard disk if the server dies, wait a little
sleep $TIMEOUT
done # while true
else
# Update if needed
update

# Run the server
if test "$DEBUG" -eq 0; then
# debug not requested we can exec
exec $HL_CMD
else
# debug requested we can't exec
$HL_CMD
debugcore $?
fi
fi
}

quit() {
# Exits with the give error code, 1
# if none specified.
# exit code 2 also prints syntax
exitcode="$1"

# default to failure
if test -z "$exitcode"; then
exitcode=1
fi

case "$exitcode" in
0)
echo "`date`: Server Quit" ;;
2)
syntax ;;
*)
echo "`date`: Server Failed" ;;
esac

# Remove pid file
if test -n "$PID_FILE" && test -f "$PID_FILE" ; then
# The specified pid file
rm -f $PID_FILE
fi

# reset SIGINT and then kill ourselves properly
trap - 2
kill -2 $$
}

# Initialise
init $*

# Run
run

# Quit normally
quit 0