local delay=5
  while true; do
    "$@" && break
    if [[ $n -lt $max ]]; then
      ((n++))
      log "Command failed. Attempt $n/$max:"
      sleep $delay;
    else
      log "The command has failed after $n attempts."  >&2
      return 2
    fi
  done
}

# load_cluster_topology function reads cluster configuration topology file and
# sets up environment variables used by other functions. So this should be called

WD=$(dirname "$0")
WD=$(cd "$WD"; pwd)

for fn in "$@"; do
  if ! grep -L -q -e "Apache License, Version 2" -e "Copyright" "${fn}"; then
    if [[ "${fn}" == *.go || "${fn}" == *.rs ]]; then
      newfile=$(cat "${WD}/copyright-banner-go.txt" "${fn}")
      echo "${newfile}" > "${fn}"
      echo "Fixing license: ${fn}"
    else
      echo "Cannot fix license: ${fn}. Unknown file type"
    fi
  fi