S3 Driver: added comment for missing KeyCount workaround
@@ -971,6 +971,9 @@ func (d *driver) doWalk(parentCtx context.Context, objectCount *int64, path, pre
listObjectErr := d.S3.ListObjectsV2PagesWithContext(ctx, listObjectsInput, func(objects *s3.ListObjectsV2Output, lastPage bool) bool {
var count int64
+ // KeyCount was introduced with version 2 of the GET Bucket operation in S3.
+ // Some S3 implementations don't support V2 now, so we fall back to manual
+ // calculation of the key count if required
if objects.KeyCount != nil {
count = *objects.KeyCount
*objectCount += *objects.KeyCount
