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#
# Author:: Serdar Sutay (<serdar@chef.io>)
# Copyright:: Copyright (c) 2013-2016 Chef Software, Inc.
# License:: Apache License, Version 2.0
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
# implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
require "ffi_yajl" unless defined?(FFI_Yajl)
module Ohai
# Ohai hints are json files on disk that give ohai a hint to things that are often
# difficult to discover like certain clouds. Previously they were used for just about
# every cloud, but we've since discoverd better ways to auto-detect these clouds.
# They are generally dropped off by the knife plugins for those clouds during bootstrap,
# but may also be manually dropped off and consumed by 3rd party plugins.
module Hints
# clear out any known hints in the @hints variable
def self.refresh_hints
@hints = {}
end
# parse the JSON contents of a hint file. Return an empty hash if the file has
# no JSON content
# @param filename [String] the hint file path
def self.parse_hint_file(filename)
json_parser = FFI_Yajl::Parser.new
hash = json_parser.parse(File.read(filename))
hash || {} # hint
# should exist because the file did, even if it didn't
# contain anything
rescue FFI_Yajl::ParseError => e
Ohai::Log.error("Could not parse hint file at #{filename}: #{e.message}")
end
# retrieve hint contents given a hint name. Looks up in @hints variable first. Attempts
# to load from file in config's :hints_path if not already cached. Saves the contents
# to the hash if the file was successfully parsed
# @param name [String] the name of the hint (not the path)
def self.hint?(name)
@hints ||= {}
return @hints[name] if @hints[name]
Ohai.config[:hints_path].each do |path|
filename = File.join(path, "#{name}.json")
next unless File.exist?(filename)
Ohai::Log.trace("Found hint #{name}.json at #{filename}")
@hints[name] = parse_hint_file(filename)
end
Ohai::Log.trace("Did not find hint #{name}.json in the hint path(s): #{Ohai.config[:hints_path].join(", ")} ") unless @hints.key?(name)
@hints[name]
end
end
end
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