if [ -f "${OUTPUT_FILE}" -a -z "$UPDATE" -a -z "$BUILD_ONLY" -a -z "$BUILD_DIRTY" ] ; then
log "Skipping stage 'netboot' as $OUTPUT_FILE exists already."
if [ -f "${OUTPUT_FILE}" -a -z "$UPDATE" -a -z "$BUILD_ONLY" -a -z "$BUILD_DIRTY" ] ; then
log "Skipping stage 'netboot' as $OUTPUT_FILE exists already."