module ChefUtils::DSL::Introspection

def ci?(node = __getnode)
  ENV.key?("CI")
end

def docker?(node = __getnode)
  # Using "File.exist?('/.dockerinit') || File.exist?('/.dockerenv')" makes Travis sad,
  # and that makes us sad too.
  !!(node && node.read("virtualization", "systems", "docker") == "guest")
end

def has_systemd_service_unit?(svc_name)
  %w{ /etc /usr/lib /lib /run }.any? do |load_path|
    file_exist?(
      "#{load_path}/systemd/system/#{svc_name.gsub(/@.*$/, "@")}.service"
    )
  end
end

def has_systemd_unit?(svc_name)
  # TODO: stop supporting non-service units with service resource
  %w{ /etc /usr/lib /lib /run }.any? do |load_path|
    file_exist?("#{load_path}/systemd/system/#{svc_name}")
  end
end

def includes_recipe?(recipe_name, node = __getnode)
  node.recipe?(recipe_name)
end

def kitchen?(node = __getnode)
  ENV.key?("TEST_KITCHEN")
end

def systemd?(node = __getnode)
  file_exist?("/proc/1/comm") && file_open("/proc/1/comm").gets.chomp == "systemd"
end