#  IP_ALIAS_SUBNETWORK
function detect-k8s-subnetwork() {
  local subnetwork_url
  subnetwork_url=$(gcloud compute instances describe \
    "${KUBE_MASTER}" --project="${PROJECT}" --zone="${ZONE}" \
    --format='value(networkInterfaces[0].subnetwork)')
  if [[ -n ${subnetwork_url} ]]; then
    IP_ALIAS_SUBNETWORK=${subnetwork_url##*/}
  fi
}

# Set IP_ALIAS_SUBNETWORK's allowSubnetCidrRoutesOverlap to a boolean value.

  local ip="${3}"

  local aliases
  aliases=$(gcloud compute instances describe "${name}" --project "${PROJECT}" --zone "${zone}" --flatten='networkInterfaces[0].aliasIpRanges[]' --format='value[separator=':'](networkInterfaces[0].aliasIpRanges.subnetworkRangeName,networkInterfaces[0].aliasIpRanges.ipCidrRange)' | sed 's/^://' | paste -s -d';' -)
  aliases="${aliases:+${aliases};}${ip}/32"