Bash snippets

check_env_vars.sh

#!/bin/bash
# Check if environment variables are are set.
# https://stackoverflow.com/a/65396324

varlist="
MAIL_TO
MAIL_ADMIN
SCW_DEFAULT_PROJECT_ID
SCW_DEFAULT_ORGANIZATION_ID
SCW_DEFAULT_REGION
SCW_DEFAULT_ZONE
SCW_ACCESS_KEY
SCW_SECRET_KEY
SCW_URL
SG_KEY
SG_SENDER
CLOUDFLARE_API_EMAIL
CLOUDFLARE_API_TOKEN
CLOUDFLARE_ZONE
"

check_vars() {
  var_names=("$@")
  for var_name in "${var_names[@]}"; do
    [ -z "${!var_name}" ] \
    && echo "$var_name is unset." \
    && var_unset=true
  done
  [ -n "$var_unset" ] && exit 1
  return 0
}

check_vars $varlist
echo "You are good to go"