-for flavour in grml-small_lenny grml-small_sid grml-medium_lenny grml-medium_sid grml_sid grml_lenny \
- grml64-small_lenny grml64-small_sid grml64-medium_lenny grml64-medium_sid grml64_sid grml64_lenny ; do
+# directory where daily ISOs are stored locally
+if [ -z "$MIRROR_DIRECTORY" ] ; then
+ echo "Error: \$MIRROR_DIRECTORY is not set. Exiting." >&2
+ exit 1
+fi
+
+if [ -z "$FLAVOURS" ] ; then
+ echo "Error: \$FLAVOURS is not set. Exiting." >&2
+ exit 2
+fi
+
+if ! cd "$MIRROR_DIRECTORY" ; then
+ echo "Error: could not change directory to $MIRROR_DIRECTORY" >&2
+ exit 1
+fi
+
+echo "---------------------------" >> "$MIRROR_DIRECTORY"/.timestamp_link
+for flavour in $FLAVOURS; do