Find out the Agent object corresponding to a BMH

agent_from_bmh.sh

# It returns all the BMH of an spoke cluster 
# and its corresponding Agent
# it could be useful when scaling down a cluster with ZTP
# ZTP only controls (and delete) the BMH object
# but the Agent is not under the Gitops control 
# and it has to be manually deleted

oc -n <SPOKE_CLUSTER_NS> get Agent.agent-install.openshift.io -o json \
 | jq '.items[].metadata | "BMH resource: " + .labels."agent-install.openshift.io/bmh" + " with Agent: " + .name '

  
# or directly get the agent of a BMH

oc -n <SPOKE_CLUSTER_NS> get Agent.agent-install.openshift.io  -o json \
 | jq '.items[].metadata | select(.labels."agent-install.openshift.io/bmh"=="<DELETED_BMH_NAME>") | .name'