importexp: handle relative run script paths properly

importexp

@@ -58,12 +58,7 @@ do
     RUN_SCRIPT_BASE=${RUN_SCRIPT_BASE#exp.}
     RUN_SCRIPT_BASE=${RUN_SCRIPT_BASE%.*}
 
-    RUN_BASE_DIR=$(dirname $RUN_SCRIPT)
-    case "$RUN_BASE_DIR" in
-        /*) ;;
-        .) RUN_BASE_DIR=$PWD ;;
-        ./*) RUN_BASE_DIR=$PWD${RUN_BASE_DIR#.} ;;
-    esac
+    RUN_BASE_DIR=$(realpath -L $(dirname $RUN_SCRIPT))
     RUN_BASE_DIR=${RUN_BASE_DIR%/$CUSTOM_SUBDIR}
 
     MODEL_BASE_DIR=${BUILD_DIR:-$RUN_BASE_DIR}