opa: Misleading storage_not_found_error when delta bundle uses persistence

Version Details

• Docker v4.17.0
• Image openpolicyagent/opa:latest-debug

Description

If persist: true is set in the config for a delta bundle, OPA will throw the following error:

storage_not_found_error: <path>: document does not exist.

This seems to be a slightly misleading or perhaps incomplete error, as it doesn’t provide much information or feedback to the user.

Steps To Reproduce

1. Add persist: true as a field to the bundle config for a delta bundle in config.yaml.
2. Run OPA, and allow it to attempt to load the bundle.
3. See the storage_not_found_error in the logs.

Expected behavior

I would expect a more specific error, maybe one pointing out that not only is persist: true not available for delta bundles, but is also invalid.