run

#!/bin/sh

REQUIREMENTS="/sbin/ip /usr/bin/slirp-fullbolt"
for R in $REQUIREMENTS
do
	[ -x $R ] || {
		echo "Requirement $R not found. Aborting."
		exit 1
	}
done

if [ "$2" ]
then
	shift
	echo "Extraneous arguments: $*"
	echo "Try to enclose them within quotes?"
	exit 255
fi

LOGDIR=/tmp/log.$$
mkdir $LOGDIR

if [ "$1" ] 
then
	CMD="$1"
	STDIN=/dev/null
	STDOUT=/dev/null
	STDERR=/dev/null
	touch $LOGDIR/output
	tail -f $LOGDIR/output &
	TAILPID=$!
	trap '' TERM
else
	CMD=/bin/zsh
	STDIN=/dev/stdin
	STDOUT=/dev/stdout
	STDERR=/dev/stderr
	TAILPID=""
fi

cat /etc/resolv.conf > $LOGDIR/resolv.conf

echo "$CMD" > $LOGDIR/cmd
INITDIR="$(readlink --canonicalize $(dirname "$0"))"
$INITDIR/uml quiet mem=2G rootfstype=hostfs rootflags=/ ro \
	eth0=slirp,,/usr/bin/slirp-fullbolt \
	init=$INITDIR/init LOGDIR="$LOGDIR" \
	<$STDIN >$STDOUT 2>$STDERR

# Due to a weird behavior of usermodelinux, sometimes it will kill the
# whole process group, and we won't have to kill tail. Duh.
[ "$TAILPID" ] && [ -d /proc/$TAILPID ] && 
	/bin/kill $TAILPID >/dev/null 2>/dev/null

STATUS=""
[ -f "$LOGDIR/status" ] && STATUS="$(cat $LOGDIR/status)"
[ "$DEBUG" ] || rm -rf "$LOGDIR"
[ "$STATUS" ] && exit $STATUS
exit 255