/usr/lib/ruby/vendor_ruby/ohai/system.rb is in ohai 6.14.0-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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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/log'
require 'ohai/mixin/from_file'
require 'ohai/mixin/command'
require 'ohai/mixin/string'
require 'yajl'
module Ohai
class System
attr_accessor :data, :seen_plugins, :hints
include Ohai::Mixin::FromFile
include Ohai::Mixin::Command
def initialize
@data = Mash.new
@seen_plugins = Hash.new
@providers = Mash.new
@plugin_path = ""
@hints = Hash.new
end
def [](key)
@data[key]
end
def []=(key, value)
@data[key] = value
end
def each(&block)
@data.each do |key, value|
block.call(key, value)
end
end
def attribute?(name)
@data.has_key?(name)
end
def set(name, *value)
set_attribute(name, *value)
end
def from(cmd)
status, stdout, stderr = run_command(:command => cmd)
return "" if stdout.nil? || stdout.empty?
stdout.strip
end
def provides(*paths)
paths.each do |path|
parts = path.split('/')
h = @providers
unless parts.length == 0
parts.shift if parts[0].length == 0
parts.each do |part|
h[part] ||= Mash.new
h = h[part]
end
end
h[:_providers] ||= []
h[:_providers] << @plugin_path
end
end
# Set the value equal to the stdout of the command, plus run through a regex - the first piece of match data is the value.
def from_with_regex(cmd, *regex_list)
regex_list.flatten.each do |regex|
status, stdout, stderr = run_command(:command => cmd)
return "" if stdout.nil? || stdout.empty?
stdout.chomp!.strip
md = stdout.match(regex)
return md[1]
end
end
def set_attribute(name, *values)
@data[name] = Array18(*values)
@data[name]
end
def get_attribute(name)
@data[name]
end
def hint?(name)
@json_parser ||= Yajl::Parser.new
return @hints[name] if @hints[name]
Ohai::Config[:hints_path].each do |path|
filename = File.join(path, "#{name}.json")
if File.exist?(filename)
begin
hash = @json_parser.parse(File.read(filename))
@hints[name] = hash || Hash.new # hint should exist because the file did, even if it didn't contain anything
rescue Yajl::ParseError => e
Ohai::Log.error("Could not parse hint file at #{filename}: #{e.message}")
end
end
end
@hints[name]
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("#{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 = @providers
else
parts.shift if parts[0].length == 0
h = @providers
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
@plugin_path = plugin_name
filename = "#{plugin_name.gsub("::", File::SEPARATOR)}.rb"
Ohai::Config[:plugin_path].each do |path|
check_path = File.expand_path(File.join(path, filename))
begin
@seen_plugins[plugin_name] = true
Ohai::Log.debug("Loading plugin #{plugin_name}")
from_file(check_path)
return true
rescue Errno::ENOENT => e
Ohai::Log.debug("No #{plugin_name} at #{check_path}")
rescue SystemExit, Interrupt
raise
rescue Exception,Errno::ENOENT => e
Ohai::Log.debug("Plugin #{plugin_name} threw exception #{e.inspect} #{e.backtrace.join("\n")}")
end
end
end
# Sneaky! Lets us stub out require_plugin when testing plugins, but still
# call the real require_plugin to kick the whole thing off.
alias :_require_plugin :require_plugin
# 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 a
when Hash,Mash,Array
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
def method_missing(name, *args)
return get_attribute(name) if args.length == 0
set_attribute(name, *args)
end
private
def Array18(*args)
return nil if args.empty?
return args.first if args.length == 1
return *args
end
end
end
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