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#
# Author:: Adam Jacob (<adam@opscode.com>)
# Copyright:: Copyright (c) 2008 Opscode, 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 'ohai/mash'
require 'ohai/loader'
require 'ohai/log'
require 'ohai/dsl/plugin'
require 'ohai/mixin/from_file'
require 'ohai/mixin/command'
require 'ohai/mixin/string'
require 'mixlib/shellout'
require 'yajl'
module Ohai
class System
attr_accessor :data
attr_reader :metadata
attr_reader :seen_plugins
attr_reader :loaded_plugins
attr_reader :hints
def initialize
@data = Mash.new
@metadata = Mash.new
@seen_plugins = Hash.new
@loaded_plugins = Hash.new
@plugin_path = ""
@hints = Hash.new
end
def [](key)
@data[key]
end
def load_plugins
loader = Ohai::Loader.new(self)
# in all_plugins, we run 'os' and all the plugins it requires (kernel,
# ruby, languages) before running the remaining plugins. this
# helps find the correct plugins based on the operating system
# and os version. we can take a similar approach here by loading
# os, kernel, ruby, and languages plugins and collecting their
# data first
# @todo: a better way of marking these plugins for pre-loading
%w{ languages ruby kernel os }.each do |plgn|
loader.load_plugin(plgn)
end
%w{ languages ruby kernel os }.each do |plgn|
@loaded_plugins[plgn].new(self).run
end
# @todo: use the data collected above to load the remaining plugins
end
def all_plugins
require_plugin('os')
Ohai::Config[:plugin_path].each do |path|
[
Dir[File.join(path, '*')],
Dir[File.join(path, @data[:os], '**', '*')]
].flatten.each do |file|
file_regex = Regexp.new("#{File.expand_path(path)}#{File::SEPARATOR}(.+).rb$")
md = file_regex.match(file)
if md
plugin_name = md[1].gsub(File::SEPARATOR, "::")
require_plugin(plugin_name) unless @seen_plugins.has_key?(plugin_name)
end
end
end
unless RUBY_PLATFORM =~ /mswin|mingw32|windows/
# Catch any errant children who need to be reaped
begin
true while Process.wait(-1, Process::WNOHANG)
rescue Errno::ECHILD
end
end
true
end
def collect_providers(providers)
refreshments = []
if providers.is_a?(Mash)
providers.keys.each do |provider|
if provider.eql?("_providers")
refreshments << providers[provider]
else
refreshments << collect_providers(providers[provider])
end
end
else
refreshments << providers
end
refreshments.flatten.uniq
end
def refresh_plugins(path = '/')
parts = path.split('/')
if parts.length == 0
h = @metadata
else
parts.shift if parts[0].length == 0
h = @metadata
parts.each do |part|
break unless h.has_key?(part)
h = h[part]
end
end
refreshments = collect_providers(h)
Ohai::Log.debug("Refreshing plugins: #{refreshments.join(", ")}")
# remove the hints cache
@hints = Hash.new
refreshments.each do |r|
@seen_plugins.delete(r) if @seen_plugins.has_key?(r)
end
refreshments.each do |r|
require_plugin(r) unless @seen_plugins.has_key?(r)
end
end
def require_plugin(plugin_name, force=false)
unless force
return true if @seen_plugins[plugin_name]
end
if Ohai::Config[:disabled_plugins].include?(plugin_name)
Ohai::Log.debug("Skipping disabled plugin #{plugin_name}")
return false
end
if plugin = plugin_for(plugin_name)
@seen_plugins[plugin_name] = true
begin
plugin.run
true
rescue SystemExit, Interrupt
raise
rescue Exception,Errno::ENOENT => e
Ohai::Log.debug("Plugin #{plugin_name} threw exception #{e.inspect} #{e.backtrace.join("\n")}")
end
else
Ohai::Log.debug("No #{plugin_name} found in #{Ohai::Config[:plugin_path]}")
end
end
def plugin_for(plugin_name)
filename = "#{plugin_name.gsub("::", File::SEPARATOR)}.rb"
plugin = nil
Ohai::Config[:plugin_path].each do |path|
check_path = File.expand_path(File.join(path, filename))
if File.exist?(check_path)
plugin = DSL::Plugin.new(self, filename.split('.')[0], check_path)
break
else
next
end
end
plugin
end
# Serialize this object as a hash
def to_json
Yajl::Encoder.new.encode(@data)
end
# Pretty Print this object as JSON
def json_pretty_print(item=nil)
Yajl::Encoder.new(:pretty => true).encode(item || @data)
end
def attributes_print(a)
data = @data
a.split("/").each do |part|
data = data[part]
end
raise ArgumentError, "I cannot find an attribute named #{a}!" if data.nil?
case data
when Hash,Mash,Array,Fixnum
json_pretty_print(data)
when String
if data.respond_to?(:lines)
json_pretty_print(data.lines.to_a)
else
json_pretty_print(data.to_a)
end
else
raise ArgumentError, "I can only generate JSON for Hashes, Mashes, Arrays and Strings. You fed me a #{data.class}!"
end
end
end
end
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