[build] data dir version handling

src/libpostal_data.in

@@ -136,7 +136,6 @@ download_release() {
 if [ $COMMAND = "download" ]; then
     if [ -e $LIBPOSTAL_DATA_VERSION_FILE ]; then
         LIBPOSTAL_DATA_DIR_VERSION=$(cat $LIBPOSTAL_DATA_VERSION_FILE)
-    fi
 
         if [ "$LIBPOSTAL_DATA_DIR_VERSION" != "$LIBPOSTAL_DATA_DIR_VERSION_STRING" ]; then
             echo "Old version of datadir detected, removing..."
@@ -150,6 +149,8 @@ if [ $COMMAND = "download" ]; then
             fi
 
             rm -f $LIBPOSTAL_DATA_DIR/last_updated*
+            rm -f $LIBPOSTAL_DATA_DIR/*_version
+        fi
     fi
 
     mkdir -p $LIBPOSTAL_DATA_DIR
@@ -164,6 +165,8 @@ if [ $COMMAND = "download" ]; then
         download_release $LIBPOSTAL_LANG_CLASS_MODEL_VERSION_PATH $LIBPOSTAL_LANG_CLASS_MODEL_LATEST_VERSION $LIBPOSTAL_DATA_DIR $LIBPOSTAL_LANG_CLASS_MODEL_CHUNKS $LIBPOSTAL_LANG_CLASS_FILE "language classifier data file" $LANGUAGE_CLASSIFIER_MODULE_DIR
     fi
 
+    echo "$LIBPOSTAL_DATA_DIR_VERSION_STRING" > $LIBPOSTAL_DATA_VERSION_FILE
+
 else
     echo "Invalid command: $COMMAND"
     exit 1