I'm trying to set GCS bucket lifecycle policies via Terraform.
As far as I can tell, the [`google_storage_bucket`](https://www.terraform.io/docs/providers/google/r/storage_bucket.html) resource only allows me to CREATE buckets; and not update existing ones. Trying to run a `google_storage_bucket` on an existing bucket raises a [409](https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/409).

The other storage-related resources do not seem to affect lifecycle policies.

So is it possible to adjust policies on existing buckets via Terraform, or should I switch to gsutil or something else?