#!/bin/sh
slot=$1
release=$2
ports=$3

#Audit slot and release names
case $slot in
	*[^a-zA-Z0-9]* ) echo "Non-alphanumeric slot $slot"; exit 1
esac
case $release in
	*[^a-zA-Z0-9/-]* ) echo "Non-alphanumeric release $release"; exit 1
esac
case $ports in
	*[^a-zA-Z0-9/-]* ) echo "Non-alphanumeric ports $ports"; exit 1
esac
if [ -z "$slot" -o -z "$release" ]; then
	echo "Zero-length slot or release"
	exit 1
fi

if [ -d /scratch/$slot ]; then
	echo "Pre-existing file system for this slot!"
	/pkgscripts/reapbuildjail $slot
fi

cleanup() {
	rm -f /scratch/$slot.lock
	/pkgscripts/reapbuildjail $slot
	exit 1
}

set -e
trap cleanup EXIT

#TODO: localhost networking

set -o noclobber
echo > /scratch/$slot.lock

set +o noclobber
cat << EOF > /scratch/$slot.conf
$slot {
	path="/scratch/$slot";
	host.hostname="$slot.`hostname`";
	persist="true";
	mount.devfs="true";
	mount.fstab="/scratch/$slot.fstab";
}
EOF
# TODO: Setting nosuid seems to break "below"
echo "/scratch/$release /scratch/$slot unionfs below,noatime 0 0" > /scratch/$slot.fstab
if [ -n "$ports" ]; then
	mkdir -p /scratch/$slot/$ports
	echo "$ports /scratch/$slot/$ports nullfs ro 0 0" >> /scratch/$slot.fstab
fi

mkdir -p /scratch/$slot

jail -f /scratch/$slot.conf -c $slot
ls /scratch/$slot/dev > /dev/null # Hack around unionfs bugs
if [ -n "$ports" ]; then
	ls /scratch/$slot/$ports > /dev/null # And once more
fi
trap true EXIT
rm /scratch/$slot.lock