A super simple Scout plugin to monitor just the existence of a file. We're using it to alert us when an NFS share goes down (if it times out, it's down).

file_check_plugin.rb

class FileCheckPlugin < Scout::Plugin
	
OPTIONS=<<-EOS
  file:
    default: ~
    name: File
    notes: The file to check to make sure it exists.
EOS
	
	def build_report
		timed_out = false
		exists = false
		file = option(:file) || "/tmp"
		begin
			timeout(5) do
				exists = File.exists?(file)
			end
		rescue Exception => e
			timed_out = true
			alert('File Check Failed With Timeout!','Checking for file existance timed out. That may mean indicate a problem with the filesystem.')
		else
			if !exists
				alert("File Does Not Exist!", "File #{file} does not exist.  That's a bad thing, right?")
			end		
		end

		report(:exists => exists.to_s, :timed_out => timed_out.to_s)
	end
end