wait for the existence of a facter fact via shell

wait-for-fact.sh

#!/bin/bash

if [ "$#" -ne 1 ]; then
  echo "Usage: check-fact <fact_name>" >&2
  exit 1
fi

name=${1}

max_retries=60
delay=5 # second(s)
counter=1

while [ ${counter} -le ${max_retries} ]; do
  value=`facter ${name}`

  if [ -z "${value}" ] && [[ ! -e "${value}" ]]; then
    echo "Check #${counter} - fact ${name} not found"
  else
    echo "Check #${counter} - fact ${name} found"
    exit 0
  fi
  sleep ${delay}
  counter=$(( counter+1 ))
done

echo "Exiting due to ${name} variable not found after ${counter} checks with ${delay} sec(s) interval..."
exit 1