#!/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

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";
	ip4.addr=127.0.0.1;
}
EOF

mkdir -p /scratch/$slot
mount -t tmpfs tmpfs /scratch/$slot

#cp -a /scratch/$release/ /scratch/$slot
tar -C /scratch/$slot -xf /buildshare/releases/$release.tar
if [ -n "$ports" ]; then
	mkdir -p /scratch/$slot/buildshare/ports/$ports
	echo "/buildshare/ports/$ports /scratch/$slot/buildshare/ports/$ports nullfs ro 0 0" >> /scratch/$slot.fstab
fi

jail -f /scratch/$slot.conf -c $slot
trap true EXIT
rm /scratch/$slot.lock