Class: Inspec::Shell

Inherits:
Object
  • Object
show all
Defined in:
lib/inspec/shell.rb

Overview

A pry based shell for inspec. Given a runner (with a configured backend and all that jazz), this shell will produce a pry shell from which you can run inspec/ruby commands that will be run within the context of the runner.

Instance Method Summary collapse

Constructor Details

#initialize(runner) ⇒ Shell

rubocop:disable Metrics/ClassLength



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# File 'lib/inspec/shell.rb', line 13

def initialize(runner)
  @runner = runner
end

Instance Method Details

#configure_pry ⇒ Object

rubocop:disable Metrics/AbcSize



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# File 'lib/inspec/shell.rb', line 28

def configure_pry # rubocop:disable Metrics/AbcSize
  # Remove all hooks and checks
  Pry.hooks.clear_all
  that = self

  # Add the help command
  Pry::Commands.block_command 'help', 'Show examples' do |resource|
    that.help(resource)
  end

  # configure pry shell prompt
  Pry.config.prompt_name = 'inspec'
  Pry.prompt = [proc { "#{readline_ignore("\e[0;32m")}#{Pry.config.prompt_name}> #{readline_ignore("\e[0m")}" }]

  # Add a help menu as the default intro
  Pry.hooks.add_hook(:before_session, 'inspec_intro') do
    intro
    print_target_info
    puts
  end

  # Track the rules currently registered and what their merge count is.
  Pry.hooks.add_hook(:before_eval, 'inspec_before_eval') do
    @runner.reset
  end

  # After pry has evaluated a commanding within the binding context of a
  # test file, register all the rules it discovered.
  Pry.hooks.add_hook(:after_eval, 'inspec_after_eval') do
    @runner.load
    @runner.run_tests if !@runner.all_rules.empty?
  end

  # Don't print out control class inspection when the user uses DSL methods.
  # Instead produce a result of evaluating their control.
  Pry.config.print = proc do |_output_, value, pry|
    next if !@runner.all_rules.empty?
    pry.pager.open do |pager|
      pager.print pry.config.output_prefix
      Pry::ColorPrinter.pp(value, pager, Pry::Terminal.width! - 1)
    end
  end
end

#help(topic = nil) ⇒ Object 



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# File 'lib/inspec/shell.rb', line 110

def help(topic = nil)
  if topic.nil?

    puts <<EOF

Available commands:

`[resource]` - run resource on target machine
`help resources` - show all available resources that can be used as commands
`help [resource]` - information about a specific resource
`help matchers` - show information about common matchers
`exit` - exit the InSpec shell

You can use resources in this environment to test the target machine. For example:

command('uname -a').stdout
file('/proc/cpuinfo').content => "value"

#{print_target_info}
EOF
  elsif topic == 'resources'
    resources.sort.each do |resource|
      puts " - #{resource}"
    end
  elsif topic == 'matchers'
    print_matchers_help
  elsif !Inspec::Resource.registry[topic].nil?
    puts <<EOF
#{mark 'Name:'} #{topic}

#{mark 'Description:'}

#{Inspec::Resource.registry[topic].desc}

#{mark 'Example:'}
#{print_example(Inspec::Resource.registry[topic].example)}

#{mark 'Web Reference:'}

https://www.inspec.io/docs/reference/resources/#{topic}

EOF
  else
    puts "The resource #{topic} does not exist. For a list of valid resources, type: help resources"
  end
end

#intro ⇒ Object 



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# File 'lib/inspec/shell.rb', line 93

def intro
  puts 'Welcome to the interactive InSpec Shell'
  puts "To find out how to use it, type: #{mark 'help'}"
  puts
end

#mark(x) ⇒ Object 



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# File 'lib/inspec/shell.rb', line 76

def mark(x)
  "#{readline_ignore("\033[1m")}#{x}#{readline_ignore("\033[0m")}"
end

#print_example(example) ⇒ Object 



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# File 'lib/inspec/shell.rb', line 80

def print_example(example)
  # determine min whitespace that can be removed
  min = nil
  example.lines.each do |line|
    if !line.strip.empty? # ignore empty lines
      line_whitespace = line.length - line.lstrip.length
      min = line_whitespace if min.nil? || line_whitespace < min
    end
  end
  # remove whitespace from each line
  example.gsub(/\n\s{#{min}}/, "\n")
end

#print_matchers_help ⇒ Object 



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# File 'lib/inspec/shell.rb', line 161

def print_matchers_help
  puts <<-EOL
Matchers are used to compare resource values to expectations. While some
resources implement their own custom matchers, the following matchers are
common amongst all resources:

#{mark 'be'}

The #{mark 'be'} matcher can be used to compare numeric values.

   its('size') { should be >= 10 }

#{mark 'cmp'}

The #{mark 'cmp'} matcher is like #{mark 'eq'} but less restrictive. It will try
to fit the resource value to the expectation.

"Protocol" likely returns a string, but cmp will ensure it's a number before
comparing:

  its('Protocol') { should cmp 2 }
  its('Protocol') { should cmp '2' }

"users" may return an array, but if it contains only one item, cmp will compare
it as a string or number as needed:

  its('users') { should cmp 'root' }

cmp is not case-sensitive:

  its('log_format') { should cmp 'raw' }
  its('log_format') { should cmp 'RAW' }

#{mark 'eq'}

The #{mark 'eq'} matcher tests for exact equality of two values. Value type
(string, number, etc.) is important and must be the same. For a less-restrictive
comparison matcher, use the #{mark 'cmp'} matcher.

  its('RSAAuthentication') { should_not eq 'no' }

#{mark 'include'}

The #{mark 'include'} matcher tests to see if a value is included in a list.

  its('users') { should include 'my_user' }

#{mark 'match'}

The #{mark 'match'} matcher can be used to test a string for a match using a
regular expression.

  its('content') { should_not match /^MyKey:\\s+some value/ }

For more examples, see: https://www.inspec.io/docs/reference/matchers/

  EOL
end

#print_target_info ⇒ Object 



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# File 'lib/inspec/shell.rb', line 99

def print_target_info
  ctx = @runner.backend
  puts <<EOF
You are currently running on:

OS platform:  #{mark ctx.os[:name] || 'unknown'}
OS family:  #{mark ctx.os[:family] || 'unknown'}
OS release: #{mark ctx.os[:release] || 'unknown'}
EOF
end

#readline_ignore(code) ⇒ Object 



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# File 'lib/inspec/shell.rb', line 72

def readline_ignore(code)
  "\001#{code}\002"
end

#resources ⇒ Object 



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# File 'lib/inspec/shell.rb', line 157

def resources
  Inspec::Resource.registry.keys
end

#start ⇒ Object 



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# File 'lib/inspec/shell.rb', line 17

def start
  # This will hold a single evaluation binding context as opened within
  # the instance_eval context of the anonymous class that the profile
  # context creates to evaluate each individual test file. We want to
  # pretend like we are constantly appending to the same file and want
  # to capture the local variable context from inside said class.
  @ctx_binding = @runner.eval_with_virtual_profile('binding')
  configure_pry
  @ctx_binding.pry
end