serverspec read chef json file

cookbooks_mysql_spec_is_slave_spec.rb

require "/root/chef/spec/spec_helper"

if property["mysql"]["is_slave"]
  describe file('/etc/my.cnf') do
    it { should contain 'read_only' }
  end

  describe command("echo \"show variables;\" \| mysql \| grep \^read_only") do
      it { should return_stdout "read_only  ON" }
  end
end

cookbooks_mysql_templates_default_my.cnf.erb

...

<% if node[:mysql][:is_slave] %>
read_only
<% end %>

...

nodes_host.json

{
  "mysql":{
    "is_slave": true
  }
}

Rakefile

require 'rubygems'
require 'rake'
require 'rspec/core/rake_task'
require 'json'
require 'chef/run_list'

json_files = Dir::glob("../chef/nodes/*.json")
Chef::Config[:cookbook_path] = '../chef/site-cookbooks/'
Chef::Config[:role_path]     = '../chef/roles/'

desc "Run serverspec to all hosts"
task :default => 'serverspec:all'

host_run_list = {}

json_files.each do |json_file|  host_config = JSON.parse(File.read(json_file))
  host_name   = File.basename(json_file, ".json")
  host_run_list[host_name] = host_config["run_list"] || []
end

namespace :serverspec do

  task :all => host_run_list.keys
  host_run_list.keys.each do |target_host|
    desc "Run serverspec to #{target_host}"
    RSpec::Core::RakeTask.new(target_host.to_sym) do |t|
      ENV['TARGET_HOST'] = target_host
      target_run_list = host_run_list[target_host]
      recipes = Chef::RunList.new(*target_run_list).expand("_default", "disk").recipes
      t.pattern = ['../chef/site-cookbooks/{' + recipes.join(',') + '}/spec/*_spec.rb', "spec/#{target_host}/*_spec.rb"]
    end
  end
end

spec_helper.rb

require 'serverspec'
require 'pathname'
require 'net/ssh'
require 'json'

include SpecInfra::Helper::Ssh
include SpecInfra::Helper::DetectOS
include Serverspec::Helper::Properties

RSpec.configure do |c|
  c.host   = ENV['TARGET_HOST']
  set_property JSON.parse(File.read("../chef/nodes/#{c.host}.json"))
  options  = Net::SSH::Config.for(c.host)
  user     = 'root'
  c.ssh    = Net::SSH.start(c.host, user, options)
  c.os     = backend.check_os
end