build-scripts/clean_obs.sh: Fix a bug.

obs/generic/build-scripts/clean_obs.sh

@@ -3,6 +3,16 @@ set -e
 
 source build-scripts/configuration_information.sh
 
+# reverse the action of obsoleting the potentially altered buildout and restoring the backed up one
+if [ ! -e $RUN_BUILDOUT_DIR/bin/backup.buildout ]; then
+	if [ -e $RUN_BUILDOUT_DIR/bin/buildout ]; then
+		cp $RUN_BUILDOUT_DIR/bin/buildout $RUN_BUILDOUT_DIR/bin/backup.buildout
+	fi
+fi
+if [ -e $RUN_BUILDOUT_DIR/bin/old.buildout ]; then
+	mv $RUN_BUILDOUT_DIR/bin/old.buildout $RUN_BUILDOUT_DIR/bin/buildout
+fi
+
 TMP_TARGET=$INITIAL_DIR/obs-tmp/$SOFTWARE_NAME
 TMP_TARGET=`realpath -m $TMP_TARGET`
 rm -rf $TMP_TARGET