#! /usr/bin/env ruby
#
#   check-mtime
#
# DESCRIPTION:
#   This plugin checks a given file's modified time.
#
# OUTPUT:
#   plain text
#
# PLATFORMS:
#   Linux, BSD
#
# DEPENDENCIES:
#   gem: sensu-plugin
#
# USAGE:
#  #YELLOW
#
# NOTES:
#
# LICENSE:
#   Copyright 2014 Sonian, Inc. and contributors. <support@sensuapp.org>
#   Released under the same terms as Sensu (the MIT license); see LICENSE
#   for details.
#

require 'sensu-plugin/check/cli'
require 'fileutils'

class Mtime < Sensu::Plugin::Check::CLI
  option :file,
         description: 'File to check last modified time',
         short: '-f FILE',
         long: '--file FILE'

  option :warning_age,
         description: 'Warn if mtime greater than provided age in seconds',
         short: '-w SECONDS',
         long: '--warning SECONDS'

  option :critical_age,
         description: 'Critical if mtime greater than provided age in seconds',
         short: '-c SECONDS',
         long: '--critical SECONDS'

  option :ok_no_exist,
         description: 'OK if file does not exist',
         short: '-o',
         long: '--ok-no-exist',
         boolean: true,
         default: false

  option :ok_zero_size,
         description: 'OK if file has zero size',
         short: '-z',
         long: '--ok-zero-size',
         boolean: true,
         default: false

  def run_check(type, age)
    to_check = config["#{type}_age".to_sym].to_i
    # #YELLOW
    if to_check > 0 && age >= to_check # rubocop:disable GuardClause
      send(type, "file is #{age - to_check} seconds past #{type}")
    end
  end

  def run
    unknown 'No file specified' unless config[:file]
    unknown 'No warn or critical age specified' unless config[:warning_age] || config[:critical_age]
    if File.exist?(config[:file])
      if File.size?(config[:file]).nil? && !config[:ok_zero_size]
        critical 'file has zero size'
      end
    end
    f = Dir.glob(config[:file]).first
    if f
      if File.size?(f).nil? && !config[:ok_zero_size]
        critical 'file has zero size'
      end
      age = Time.now.to_i - File.mtime(f).to_i
      run_check(:critical, age) || run_check(:warning, age) || ok("file is #{age} seconds old")
    else
      if config[:ok_no_exist]
        ok 'file does not exist'
      else
        critical 'file not found'
      end
    end
  end
end