Ensure environment is exist and empty

ensure-env.sh

#!/usr/bin/env bash

# Functions --------
ensure_env () {
  ENV_NAME="$1"
  ENV_VAL=${!ENV_NAME}
  if [[ -z "${ENV_VAL}" ]]; then
    echo "${ENV_NAME} does not exists, exiting."
    exit
  else
    echo "$ENV_NAME = ${ENV_VAL}"
  fi
}
# END Functions ----

# Init -------------
ensure_env GIT_BRANCH
ensure_env GIT_REPO_DIR
ensure_env GIT_REPO
ensure_env GIT_NAME
ensure_env GIT_EMAIL
# END Init ---------