Get CloudFormation export shell function

getCfnExport.sh

# Example usage:
# 
#   $ getCfnExport MyStack-RoleArn
#   arn:aws:iam:us-east-1:111111111111:TheExportedRole
# 

function getCfnExport {
  local EXPORT_VALUE="$(aws cloudformation list-exports --output text --query "Exports[?Name=='${1?}'].Value")"
  if [ -z "$EXPORT_VALUE" ]; then
    echo "Could not find CloudFormation export '${1}'" 1>&2
    # Use for CI/CD pipeline
    #exit 1
    # Use for normal shell
    return 1
  else
    echo ${EXPORT_VALUE}
    return 0
  fi
}