Merge pull request #4755 from schomatis/fix/add/hash-only

add: hash-only: set the prefix for MFS root

core/commands/add.go

@@ -283,7 +283,10 @@ You can now check what blocks have been created by:
 
 		if hash {
 			md := dagtest.Mock()
-			mr, err := mfs.NewRoot(req.Context, md, ft.EmptyDirNode(), nil)
+			emptyDirNode := ft.EmptyDirNode()
+			// Use the same prefix for the "empty" MFS root as for the file adder.
+			emptyDirNode.Prefix = *fileAdder.Prefix
+			mr, err := mfs.NewRoot(req.Context, md, emptyDirNode, nil)
 			if err != nil {
 				res.SetError(err, cmdkit.ErrNormal)
 				return

test/sharness/t0043-add-w.sh

@@ -149,6 +149,15 @@ test_add_w() {
     echo "$add_w_d1_v1" >expected &&
     test_sort_cmp expected actual
   '
+
+  test_expect_success "ipfs add -w -r -n (dir) --cid-version=1 succeeds" '
+    ipfs add -r -w -n --cid-version=1 m/t_1wp-8a2/_jo7 >actual
+  '
+
+  test_expect_success "ipfs add -w -r -n (dir) --cid-version=1 is correct" '
+    echo "$add_w_d1_v1" > expected &&
+    test_sort_cmp expected actual
+  '
 }
 
 test_init_ipfs