deploy

#! /usr/bin/env bash

nomad_token=$1
nomad_address=$2
nomad_job_file_path=$3
replaced_nomad_job_file_path=/tmp/nomad-deploy/jobs/$(basename "$3")
additional_vars=$4

produce_replaced_nomad_file() {
  # Make the temporary directory and create the new job file
  mkdir -p /tmp/nomad-deploy/jobs
  touch "$replaced_nomad_job_file_path"
  if [[ $additional_vars == "" ]]
  then
    echo 'No additional vars found'
    # Just copy the job file straight across, no replacement of env vars
    cat "$nomad_job_file_path" > "$replaced_nomad_job_file_path"
  else
    local additional_vars_array=("$additional_vars")
    local keys_to_replace=()
    for pair in ${additional_vars_array[*]}
    do
      # collect the keys_to_replace of each additional var in an array
      keys_to_replace+=("\$${pair%=*}")
    done
    # replace the contents of the job file with the required env vars
    envsubst "${keys_to_replace[*]}" > "$replaced_nomad_job_file_path" < "$nomad_job_file_path"
  fi
}

if [ -f "$nomad_job_file_path" ]; then
  echo "$nomad_job_file_path exists"
  # export each of the additional_vars
  for pair in $additional_vars; do export "${pair?}"; done
  produce_replaced_nomad_file
  export NOMAD_ADDR="$nomad_address"
  export NOMAD_TOKEN="$nomad_token"
  nomad job run "$replaced_nomad_job_file_path"
else
  echo "$nomad_job_file_path does not exist"
  exit 1
fi