#!/bin/sh

if [ $# -ne 1 ]; then
	echo "usage: $0 name" >/dev/stderr
	exit 1
fi

base="system/jails/$1"
path="/jails/$1"

zfsupgrade() {
	zfs destroy system/root@jailbase_old 2>/dev/null
	zfs rename system/root@jailbase system/root@jailbase_old 2>/dev/null
	zfs snapshot system/root@jailbase 2>/dev/null

	zfs destroy ${base}_old 2>/dev/null
	zfs rename ${base} ${base}_old
	zfs clone system/root@jailbase ${base}
	zfs set readonly=on ${base}

	for fs in etc tmp var usr root; do
		zfs rename ${base}_old/${fs} ${base}/${fs}
	done
}

zfsupgrade

cd /usr/src
umask 22
mergemaster -p -D ${path}
mergemaster -i -D ${path}