Render a BOSH template

render-bosh-template.sh

#!/usr/bin/env ruby

require 'active_support/core_ext/hash'
require 'erb'
require 'yaml'
require 'ostruct'
require 'bosh/template/evaluation_context'
require 'json'

include Bosh::Template::PropertyHelper

if ARGV.empty?
	puts "render-template [job] [template] [manifest]"
	exit
end

jobName  = ARGV[0]
template = ARGV[1]
envFile  = ARGV[2]

release_dir= File.expand_path("..", File.dirname(__FILE__))

envProperties = YAML.load(File.open(envFile))
spec = YAML.load(File.open("#{release_dir}/jobs/#{jobName}/spec"))
properties = spec["properties"]
newProperties = {}

properties.each_pair do |name, definition|
	unless definition["default"] == nil
    	copy_property(newProperties, properties, name, definition["default"])
	end
end

spec["properties"] = newProperties.deep_merge(envProperties)

evaluation_context = Bosh::Template::EvaluationContext.new(spec)

template_name = "#{release_dir}/jobs/#{jobName}/templates/#{template}"
template = ERB.new(File.read(template_name))

script = template.result(evaluation_context.get_binding)
puts script

Gemfile

source 'https://rubygems.org'

gem 'bosh-template', '~> 1.3202.0'
gem 'activesupport', '~> 4.2.5.2'
gem 'rspec', '~> 3.4.0'