Switch your Google Cloud service accounts on the command line

gcloud-activate.sh

# put this in your ~/.profile, then reload your shell
function gcloud-activate() {
  local action="$1"
  local account=""
  local credentials=""

  case "${action}" in
    alpha)
      account="alpha-cicd@my-project-alpha.iam.gserviceaccount.com"
      credentials="${HOME}/.config/gcloud/my-project-alpha.json"
    ;;
    beta)
      account="beta-cicd@my-project-beta.iam.gserviceaccount.com"
      credentials="${HOME}/.config/gcloud/my-project-beta.json"
    ;;
    reset)
      account="default.user@gmail.com"
      credentials=""
    ;;
    *) { echo "Usage: ${FUNCNAME[0]} [alpha|beta|reset]"; return 1; };;
  esac

  # GOOGLE_APPLICATION_CREDENTIALS is consumed by Terraform
  if [ -n "${credentials}" ] && [ -r "${credentials}" ]; then
    export GOOGLE_APPLICATION_CREDENTIALS="${credentials}"
    gcloud auth activate-service-account --key-file="${GOOGLE_APPLICATION_CREDENTIALS}"
  else
    unset GOOGLE_APPLICATION_CREDENTIALS
  fi

  gcloud config set account "${account}"
}