atomic counter in consul

consul-incr.sh

#!/bin/bash

KEY=$1
VAL=$2
MAX=${3-10}

if [ -z $KEY ]; then
  echo "Must specify a key" >&2
  exit 1
fi

if [ -z $VAL ]; then
  echo "Must specify a value" >&2
  exit 1
fi

for i in $(seq $MAX); do
  OUTPUT=$(curl -s --fail -X PUT "http://localhost:8500/v1/kv/$KEY/$i?cas=0" -d "$VAL")
  if [ $? -eq 0 ] && [[ $OUTPUT == true ]]; then
    echo $i
    exit 0
  fi
done

exit 1