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csi-addons admin and testing tool

The csi-addons executable connects to a socket where the CSI-driver listens for CSI-Addons requests. The tool can be executed in the side-car that is running alongside CSI-driver containers.

When running the tool with the -h parameter, it displays the help text, similar to:

$ kubectl exec -c csi-addons csi-backend-nodeplugin -- csi-addons -h
  -drivername string
    	name of the CSI driver
  -endpoint string
    	CSI-Addons endpoint (default "unix:///tmp/csi-addons.sock")
  -legacy
    	use legacy format for old Kubernetes versions
  -operation string
    	csi-addons operation
  -persistentvolume string
    	name of the PersistentVolume
  -stagingpath string
    	staging path (default "/var/lib/kubelet/plugins/kubernetes.io/csi/")

The following operations are supported:
 - NodeReclaimSpace
 - GetIdentity
 - GetCapabilities
 - Probe
 - ControllerReclaimSpace

The above command assumes the running csi-backend-nodeplugin Pod has the quay.io/csiaddons/k8s-sidecar as a container named csi-addons. Executing the csi-addons -h command then shows the help text.