This repository contains components that implement the KEP-3314 CSI Changed Block Tracking feature.

The repository provides the following components:

• The External Snapshot Metadata sidecar container that exposes the Kubernetes SnapshotMetadataService API to backup applications, and interacts with a CSI driver's implementation of the CSI SnapshotMetadataService.
• The SnapshotMetadataService CRD used to advertise the CSI Driver's support for the CSI Changed Block Tracking feature.
• gRPC stubs
  • Kubernetes SnapshotMetadataService API
  • Mocks for the Kubernetes SnapshotMetadataService API client
  • Mocks for the CSI SnapshotMetadataService API client
• Examples
  • Instructions on how to deploy a CSI driver with the external-snapshot-metadata sidecar.
  • A snapshot-metadata-lister example command to illustrate how a Kubernetes backup application could fetch snapshot metadata. This is based on pkg/iterator, which a backup application developer could use directly to fetch snapshot metadata, if desired.
  • A snapshot-metadata-verifier command to provide a way to verify allocated or changed blocks metadata generated by CSI Drivers.

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