Module: Promotion::Generator::Crontab

Defined in:
lib/promotion/generator/crontab.rb

Class Method Summary collapse

Class Method Details

.contents(user, crontablist) ⇒ Object

Generates the contents for /var/cron/tabs/user, containing scheduled jobs



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# File 'lib/promotion/generator/crontab.rb', line 47

def self.contents(user, crontablist)
  contents = []
  contents << "# /var/cron/tabs/#{user} - #{user}'s crontab \n#\n"
  contents << "#minute hour    mday    month   wday    command\n#\n\n"
  crontablist.each { |sched|
    if sched.attributes["Comment"]
      contents << "#______________________________\n"
      contents << "# #{sched.attributes["Comment"]} \n"
    end
    minute = sched.attributes["Minute"] || "*"
    hour   = sched.attributes["Hour"]   || "*"
    mday   = sched.attributes["DayOfMonth"] || "*"
    month  = sched.attributes["Month"]  || "*"
    wday   = sched.attributes["DayOfWeek"] || "*"
    cmd    = (sched.elements["Command"].cdatas[0]).value().strip()
    contents << minute + "\t" + hour + "\t" + mday + "\t" + month + "\t" + wday + "\t" + cmd + "\n"
  }
  return(contents.join(""))
end

.generate(specs) ⇒ Object

The crontab for each user must be deployed using the crontab tool



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# File 'lib/promotion/generator/crontab.rb', line 6

def self.generate(specs)
  sym = "Crontab"
begin
	schedules = {}  # keyed on user, value is array of schedule elements
	specs.each { |spec|
		spec.elements.each("/Specification/Crontab/Schedule") { |sched|
			user = sched.attributes["User"]
			schedules[user] = [] unless schedules.has_key?(user)
			schedules[user] << sched
		}
	}
	schedules.each { |user, crontablist|
		generatedContents = self.contents(user, crontablist)
		userCrontab = File.expand_path(user, Folders::Crontabs)
      begin
			tempFilename = user + ".tmp"
			tempFile = File.new(tempFilename, File::WRONLY | File::CREAT | File::TRUNC)
			tempFile.puts(generatedContents)
			# previous cron jobs are *NOT* preserved - the tab is competely generated!
			# otherwise we accumulate the cron-generated warning messages at the top of the file
		ensure
			tempFile.close unless tempFile.nil? || tempFile.closed?
		end
		$log.info("Checking temporary crontab written to #{tempFilename}.")
		crontabResults = `#{Files::Crontab} -u #{user} #{tempFilename}`
		if $?.exitstatus == 0
			$log.info("crontab confirms that crontab syntax is correct for user #{user}.")
		else
			$log.error(crontabResults)
			raise
		end
		FileUtils.rm_f(tempFilename)
		$log.info("New crontab installed for user #{user}")
	}
rescue => e
	$log.error("Error occurred while generating crontab\n#{e.message}" + e.backtrace.join("\n"))
	exit 1
end
end