Add ENV helper

.local/bin/ansible-become-password

@@ -0,0 +1,7 @@
+#!/usr/bin/env ruby
+# frozen_string_literal: true
+
+# vim:ft=ruby
+
+@var_name = "ANSIBLE_BECOME_PASSWORD"
+require_relative "../lib/get-env-var"

.local/bin/ansible-vault-password

@@ -0,0 +1,7 @@
+#!/usr/bin/env ruby
+# frozen_string_literal: true
+
+# vim:ft=ruby
+
+@var_name = "ANSIBLE_VAULT_PASSWORD"
+require_relative "../lib/get-env-var"

.local/lib/get-env-var.rb

@@ -0,0 +1,13 @@
+# frozen_string_literal: true
+
+if !defined?(@var_name)
+  $stderr.puts "`var_name` is undefined"
+  exit 2
+end
+
+if !ENV.key?(@var_name)
+  $stderr.puts "#{@var_name} is not set"
+  exit 1
+end
+
+printf "%s", ENV[@var_name]