Node Feature Discovery Source

This is node-feature-discovery source moved out of tree to allow for using the APIs separately from Kubernetes. To join the discussion, please see this issue.

Notes

These are development notes for the migration. I used git-filter-repo to select just source and the specific API directory:

git-filter-repo  --path source/ --path pkg/apis/nfd/v1alpha1/ --path pkg/utils/ --path pkg/cpuid/ --path LICENSE

The above ensures that original author contributions (commit history) is maintained.

Changes

I made the following changes to cleanly separate the Kubernetes logic from the source logic.

• pkg/apis/nfd/v1alpha1/types.go
  • The need for corev1 in types.go is only because of Taints, which I don't see anywhere in source so I'm removing.
  • metav1 is to add object metadata (also for Kubernetes) so I will remove that for now.
  • The protocol buffers would also be for gRPC, which is a specific use case not necessary for underlying source.
  • It looks like we don't actually need NodeFeature, NodeFeatureSpec, NodeFeatureList, NodeFeatureRule (these are higher level in the logic)
  • The entire namespace of Rule/Match is oriented to custom, which also seems like it belongs in the upstream
  • I'm keeping the same path for now to maintain git history
  • When we remove the above, the interface is very simple!
• pkg/apis/nfd/v1alpha1/register.go
  • Is primarily for K8s schemas, etc. can be removed.
• pkg/apis/nfd/v1alpha1/feature.go
  • MergeInto functions are not used, as aren't the Node specific ones.
• pkg/apis/nfd/v1alpha1/nodefeaturerule
  • Also does not seem used in source
• pkg/utils/flags.go also not used
• pkg/utils/memory_resources.go (and test) are not used in source, this is again for K8s
• pkg/utils/(klog|kubeconf|grpc_log.go|metrics.go|tls.go) are kubernetes specific, also removing, and kubernetes.go
• klog is replaced with "slog" which is part of go as of 1.21.