fix consolidate_metadata with FSStore (#916)

Author: Joe Hamman

zarr/convenience.py

@@ -1117,7 +1117,7 @@ def consolidate_metadata(store: StoreLike, metadata_key=".zmetadata"):
     open_consolidated
 
     """
-    store = normalize_store_arg(store)
+    store = normalize_store_arg(store, clobber=True)
 
     def is_zarr_key(key):
         return (key.endswith('.zarray') or key.endswith('.zgroup') or

zarr/tests/test_storage.py

@@ -19,6 +19,7 @@
 
 import zarr
 from zarr.codecs import BZ2, AsType, Blosc, Zlib
+from zarr.convenience import consolidate_metadata
 from zarr.errors import MetadataError
 from zarr.hierarchy import group
 from zarr.meta import ZARR_FORMAT, decode_array_metadata
@@ -1009,6 +1010,10 @@ def test_create(self):
         assert "data" in os.listdir(path1)
         assert ".zgroup" in os.listdir(path1)
 
+        # consolidated metadata (GH#915)
+        consolidate_metadata("file://" + path1)
+        assert ".zmetadata" in os.listdir(path1)
+
         g = zarr.open_group("simplecache::file://" + path1, mode='r',
                             storage_options={"cache_storage": path2,
                                              "same_names": True})