[ -n "$3" ] && mountdir=$3
[ -z "$mountdir" ] && err '$mountdir must be set'
-[ -z "$rundir" ] && err '$rundir must be set'
+
+rundir=${rundir:-$(dirname $0)}
export PATH=${rundir%/}:/bin:/usr/bin:/sbin:/usr/sbin:/sw/bin
-if [ ! -z "$1" -o ! -d "$2" ]; then
+if [ -z "$1" -o ! -d "$2" ]; then
err "
Usage: $(basename $0) <source-dir> <relocate-dir> [<mnt-dir>]