#!/usr/bin/env sh

cd $(dirname "$0")

GREP='/usr/bin/env grep -E'
SCREEN='/usr/bin/env screen'
SED='/usr/bin/env sed -E'
if [ `uname -s` = "FreeBSD" ]; then
    SU="/usr/bin/env su"
else
    SU='/usr/bin/env su -s /bin/sh'
fi
PERL='/usr/bin/env perl'

# Install missing packages
DEB_PACKAGES_LIST="screen libxml-libxml-perl libgearman-client-perl"
ARCH_PACKAGES_LIST="screen"
GENTOO_PACKAGES_LIST="app-misc/screen dev-perl/XML-LibXML"
FBSD_PACKAGES_LIST="screen p5-XML-LibXML p5-Gearman p5-Term-ANSIColor"

KERNEL=`uname -s`


if [ "$KERNEL" = "FreeBSD" ]
then

    for PK in `echo $FBSD_PACKAGES_LIST`
    do
    if ! pkg info "$PK" > /dev/null 2> /dev/null
    then
        if ! PACKAGESITE="http://canon.acu.epita.fr/repo-lab" pkg install "$PK"
	then
	    echo "Error during installation of $PK"
	    exit 1
	fi
    fi
    done

    if ! getent passwd | grep "guantanamo:" > /dev/null 2> /dev/null
    then
        pw useradd guantanamo -u 941 -d /home/guantanamo -s /bin/false
    fi

elif [ "$KERNEL" = "Linux" ]
then

    if [ -f "/etc/debian_version" ]
    then

	if ! whereis dpkg > /dev/null 2> /dev/null
	then
            if ! aptitude install dpkg
	    then
		echo "Error during installation of $PK"
		exit 1
	    fi
	fi

	for PK in $DEB_PACKAGES_LIST
	do
	    if ! dpkg -l | grep "^ii" | grep "$PK" > /dev/null 2> /dev/null
	    then
		aptitude install "$PK"
	    fi
	done

    elif [ -f "/etc/arch-release" ]
    then

	for PK in $ARCH_PACKAGES_LIST
	do
            if ! pacman -Qi "$PK" > /dev/null 2> /dev/null
	    then
		if ! pacman -S "$PK"
		then
		    echo "Error during installation of $PK"
		    exit 1
		fi
	    fi
	done

    elif [ -f "/etc/gentoo-release" ]
    then

	for PK in $GENTOO_PACKAGES_LIST
	do
            if ! equery list "$PK" > /dev/null 2> /dev/null
	    then
		if ! emerge "$PK"
		then
		    echo "Error during installation of $PK"
		    exit 1
		fi
	    fi
	done

    else

	echo "Unsupported GNU/Linux distribution :("
	exit 1;

    fi


    # Add guantanamo user if missing
    if ! getent passwd | grep "guantanamo:" > /dev/null 2> /dev/null
    then
	useradd --shell /bin/false --uid 941 guantanamo &&
	mkdir -p /home/guantanamo
    fi

    chown -R guantanamo:guantanamo /home/guantanamo

else

    echo "Unsupported operating system :("
    exit 1;

fi

chown -R guantanamo .

if [ $# -gt 0 ]
then
    ARCHNAME=$1
else
    echo "Expected at first argument: node name. For example: hurd-ia64"
    exit 1
fi

CMD="$SCREEN -S 'guantanamo_$ARCHNAME' -d -m sh -c 'while true; do perl guantanamo_node.pl $ARCHNAME; done'"

if [ "x$UID" = "x0" ]
then
    echo "$CMD" | $SU guantanamo
else
    $CMD
fi