Bash script for executing with AWS SSM parameters exported as environment variables. Useful as an entrypoint for docker containers intended to run in ecs

with-params

#!/bin/bash
#
#
#

# get-parameters-by-path seems to always max out results to 
# adjust this to be more than you need
SSM_MAX_ITEMS=${SSM_MAX_ITEMS:-20}

ssm_available() {
  if [ -z ${SSM_BASE_PATH+x} ]; then
    return 1
  fi

  return 0
}

get_ssm_params() {
  aws ssm get-parameters-by-path --max-items ${SSM_MAX_ITEMS} --path ${SSM_BASE_PATH} --with-decryption --query Parameters | \
  jq -r 'map("\(.Name | sub("'${SSM_BASE_PATH}'";""))=\(.Value)") | join("\n")'
}

exec_with_ssm_parameters() {
  for parameter in `get_ssm_params`; do
    echo "Info: Exporting parameter ${parameter%%=*}"
    export ${parameter}
  done
  exec "$@"
}

main() {
  if ssm_available; then
    echo "Info: Loading SSM Parameters" >&2
    exec_with_ssm_parameters "$@"
  fi

  echo "Info: Starting ..." >&2
  exec "$@"
}

main "$@"