#!/bin/bash
# ////////////////////////////////////////////////////////////////////////////////
# //BOCA Online Contest Administrator
# //    Copyright (C) 2003-2012 by BOCA System (bocasystem@gmail.com)
# //
# //    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 3 of the License, 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
# //    along with this program.  If not, see <http://www.gnu.org/licenses/>.
# ////////////////////////////////////////////////////////////////////////////////
#Last modified: 21/july/2012 by cassio@ime.usp.br
#
# parameters are:
# $1 source_file
# $2 exe_file (default run.jar)
# $3 timelimit (optional, limit to run all the repetitions, by default only one repetition)
# $4 maximum allowed memory (in MBytes)
#
# the output of the submission should be directed to the standard output
#
# the return code show what happened (according to safeexec):
# 0 ok
# 1 compile error
# 2 runtime error
# 3 timelimit exceeded
# 4 internal error
# 5 parameter error
# 6 internal error
# 7 memory limit exceeded
# 8 security threat
# 9 runtime error
# other_codes are unknown to boca: in this case BOCA will present the
#                                  last line of standard output to the judge

umask 0022
if [ "$1" == "" ]; then
    echo "parameter problem"
    exit 43
fi
name="$1"
if [ ! -r "$1" ]; then
    echo "$1 not found or it's not readable"
    exit 44
fi
mkdir -p src
if [ "${name##*.}" == "zip" -a "${name##*.}" == "ZIP" ]; then
	unzip "$name" -d src
    if [ "${name##*.}" == "zip" ]; then
		name=`basename $name .zip`
	else
		name=`basename $name .ZIP`
	fi
else
	mv $name src
fi

id -u bocajail >/dev/null 2>/dev/null
if [ $? == 0 ]; then
	bocau=`id -u bocajail`
	bocag=`id -g bocajail`
	chown bocajail.nogroup .
else
	bocau=`id -u nobody`
	bocag=`id -g nobody`
	chown nobody.nogroup .
fi
if [ "$bocau" == "" -o "$bocag" == "" ]; then
	echo "error finding user to run script"
	exit 43
fi

# this script makes use of safeexec to execute the code with less privilegies
# make sure that directories below are correct.
sf=`which safeexec`
[ -x "$sf" ] || sf=/usr/bin/safeexec
if [ ! -x $sf ]; then
    echo "$sf not found or it's not executable"
    exit 46
fi

time=$4
if [ "$time" -gt "0" ]; then
  let "ttime = $time + 30"
else
  time=1
  ttime=30
fi

maxm=512
if [ "$4" != "" -a "$4" -gt "0" ]; then
maxm=$4
fi

if [ "$2" == "" ]; then
  jarfile=run.jar
else
  jarfile=$2
fi

cdir=`pwd`
echo "Current directory is $cdir" >&2

cat <<EOF > compileit.sh
#!/bin/bash
javac=`which javac`
[ -x "\$javac" ] || javac=/usr/bin/javac
if [ ! -x \$javac ]; then
    echo "\$javac not found or it's not executable"
    exit 47
fi
jar=`which jar`
[ -x "\$jar" ] || jar=/usr/bin/jar
if [ ! -x \$jar ]; then
    echo "\$jar not found or it's not executable"
    exit 47
fi
export CLASSPATH=.:\$CLASSPATH
cd src
if [ -r "$name" ]; then
  \$javac -Xmx${maxm}M -Xms${maxm}M "$name"
  echo \$? > compileit.retcode
fi
find . -name "*.java" | while read lin; do
  \$javac -Xmx${maxm}M -Xms${maxm}M "\$lin"
  echo \$? > compileit.retcode
done
rm -f ../$jarfile
\$jar cvf ../$jarfile *
EOF
chmod 755 compileit.sh

echo $cdir | grep -q "/bocajail"
if [ $? == 0 ]; then
    cdir=`echo $cdir | sed "s/.*\/bocajail//"`
    cat <<EOF > runit.sh
#!/bin/bash
[ -f /proc/cpuinfo ] || /bin/mount -t proc proc /proc
#/bin/mount --bind /dev /dev
[ -d /sys/kernel ] || /bin/mount -t sysfs sysfs /sys

$sf -r1 -t$time -T$ttime -F256 -u256 -ostdout0 -estderr0 -U$bocau -G$bocag -n0 -C. -f20000 -d20000000 -m20000000 ./compileit.sh

/bin/umount /proc 2>/dev/null
#/bin/umount /dev
/bin/umount /sys 2>/dev/null
EOF
    chmod 755 runit.sh
    chroot /bocajail "$cdir/runit.sh"
  	ret=`cat runit.retcode`
else
	echo "COMPILATION IS NOT BEING CHROOTED -- THIS IS NOT AN IDEAL SETTING"
#	$javac "$name"
	$sf -r1 -t$time -T$ttime -F256 -u256 -U$bocau -G$bocag -ostdout0 -estderr0 -n0 -C. -d20000000 -m20000000 ./compileit.sh
	ret=$?
fi
rm -rf src/
if [ -f stdout0 ]; then
	cat stdout0
fi
if [ "$ret" != "0" ]; then
	echo "Compilation Error: $ret"
	exit $ret
fi
ret=`cat compileit.retcode`
if [ "$ret" != "0" ]; then
	echo "Compilation Error: $ret"
	ret=1
fi
exit $ret