diff --git a/xCAT-genesis-builder/debuild-xcat-genesis-base b/xCAT-genesis-builder/debuild-xcat-genesis-base
index 1b952adc3..d897039ee 100755
--- a/xCAT-genesis-builder/debuild-xcat-genesis-base
+++ b/xCAT-genesis-builder/debuild-xcat-genesis-base
@@ -1,7 +1,15 @@
 #!/bin/bash
+#
+# This is a dirty script for convert an xCAT-genesis-base rpm package to
+# a debian package.
+#
 
 # xCAT-genesis-base-x86_64-2.13.10-snap201801090246.noarch.rpm
 RPM_PACKAGE="$1"
+[ -n "${RPM_PACKAGE}" ] ||
+	echo "Usage: ${0##*/} /path/to/xCAT-genesis-base.rpm" && exit 0
+
+set -x
 
 [ -n "${RPM_PACKAGE}" ] || exit 1
 [ -f "${RPM_PACKAGE}" ] || exit 1
@@ -29,11 +37,16 @@ fi
 cat >"${EXTRACT_DIR}/debian/preinst" <<-EOF
 #!/bin/bash
 
-rm -rf /opt/xcat/share/xcat/netboot/genesis/${PACKAGE_ARCH}/fs/bin
-rm -rf /opt/xcat/share/xcat/netboot/genesis/${PACKAGE_ARCH}/fs/sbin
-rm -rf /opt/xcat/share/xcat/netboot/genesis/${PACKAGE_ARCH}/fs/lib
-rm -rf /opt/xcat/share/xcat/netboot/genesis/${PACKAGE_ARCH}/fs/lib64
-rm -rf /opt/xcat/share/xcat/netboot/genesis/${PACKAGE_ARCH}/fs/var/run
+[ -d /opt/xcat/share/xcat/netboot/genesis/${PACKAGE_ARCH}/fs/bin ] &&
+	rm -rf /opt/xcat/share/xcat/netboot/genesis/${PACKAGE_ARCH}/fs/bin
+[ -d /opt/xcat/share/xcat/netboot/genesis/${PACKAGE_ARCH}/fs/sbin ] &&
+	rm -rf /opt/xcat/share/xcat/netboot/genesis/${PACKAGE_ARCH}/fs/sbin
+[ -d /opt/xcat/share/xcat/netboot/genesis/${PACKAGE_ARCH}/fs/lib ] &&
+	rm -rf /opt/xcat/share/xcat/netboot/genesis/${PACKAGE_ARCH}/fs/lib
+[ -d /opt/xcat/share/xcat/netboot/genesis/${PACKAGE_ARCH}/fs/lib64 ] &&
+	rm -rf /opt/xcat/share/xcat/netboot/genesis/${PACKAGE_ARCH}/fs/lib64
+[ -d /opt/xcat/share/xcat/netboot/genesis/${PACKAGE_ARCH}/fs/var/run ] &&
+	rm -rf /opt/xcat/share/xcat/netboot/genesis/${PACKAGE_ARCH}/fs/var/run
 EOF
 
 ( cd "${EXTRACT_DIR}" && debian/rules binary )