gistfile1.txt

#!/bin/bash
INSTANCE_PREFIX=${INSTANCE_PREFIX:?'provide the damn naming prefix of the instances'}
PROJECT=${PROJECT:?'provide the damn gcp project'}
IFS=$'\n'

declare -a disks_to_remove

for uid in $(oc get pvc --all-namespaces -o jsonpath='{range .items[*]}{@.metadata.uid}{"\n"}'); do
  IFS=$'\n'
  for disk in $(gcloud --project $PROJECT compute disks list --filter="name~$uid" --format="csv[no-heading](name,zone)"); do
    disk_name=$(echo $disk | awk -F',' '{ print $1 }')
    zone=$(echo $disk | awk -F ',' '{ print $2 }')
    IFS=$'\n'
    for instance in $(gcloud --project "${PROJECT}" compute disks describe "${disk_name}" --zone "${zone}" --format="value(users.basename())"); do
      if grep $CLUSTER_PREFIX <<< "$instance"; then
        echo ">>> DISK $disk_name USED BY CLUSTER $CLUSTER_PREFIX"
        disks_to_remove+=($disk_name)
      fi
    done
  done
done

echo "${disks_to_remove[*]}"%