Update makefile to catch WSL folder error (#1108)

- Resolve #1103
- Remove dead code

Makefile

@@ -161,25 +161,6 @@ ifneq (,$(wildcard $(AREA_BBOX_FILE)))
   export BBOX
 endif
 
-ifeq ($(strip $(area)),)
-  define assert_area_is_given
-	@echo ""
-	@echo "ERROR: $(AREA_ERROR)"
-	@echo ""
-	@echo "  make $@ area=<area-id>"
-	@echo ""
-	@echo "To download an area, use   make download <area-id>"
-	@echo "To list downloadable areas, use   make list-geofabrik   and/or   make list-bbbike"
-	@exit 1
-  endef
-else
-  ifneq ($(strip $(AREA_INFO)),)
-    define assert_area_is_given
-	@echo "$(AREA_INFO)"
-    endef
-  endif
-endif
-
 #
 #  TARGETS
 #
@@ -230,12 +211,25 @@ help:
 	@echo "  make help                            # help about available commands"
 	@echo "=============================================================================="
 
+define win_fs_error
+	( \
+	echo "" ;\
+	echo "ERROR: Windows native filesystem" ;\
+	echo "" ;\
+	echo "Please avoid running OpenMapTiles in a Windows filesystem." ;\
+	echo "See https://github.com/openmaptiles/openmaptiles/issues/1095#issuecomment-817095465" ;\
+	echo "" ;\
+	exit 1 ;\
+	)
+endef
+
 .PHONY: init-dirs
 init-dirs:
 	@mkdir -p build/sql/parallel
 	@mkdir -p build/openmaptiles.tm2source
 	@mkdir -p data/borders
 	@mkdir -p cache
+	@ ! ($(DOCKER_COMPOSE) 2>/dev/null run $(DC_OPTS) openmaptiles-tools df --output=fstype /tileset| grep -q 9p) || ($(win_fs_error))
 
 build/openmaptiles.tm2source/data.yml: init-dirs
 ifeq (,$(wildcard build/openmaptiles.tm2source/data.yml))