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#
# persistent_crontab_minutes.rb
#
module Puppet::Parser::Functions
newfunction(:persistent_crontab_minutes, :type => :rvalue, :doc => <<-EOS
EOS
) do |arguments|
raise(Puppet::ParseError, "Wrong number of arguments " +
"given (#{arguments.size} for 2)") if arguments.size < 2
require 'md5'
value = 0
job = arguments[0]
host = arguments[1]
environment = Puppet[:environment]
# We select first directory that exists. This might not be the best idea ...
modules = Puppet[:modulepath].split(':').select { |i| File.exists?(i) }.first
raise(Puppet::ParseError, "Unable to determine the storage " +
"directory for Puppet modules") unless modules
# Prepare the file where we store current value ...
file = "/puppet/state/crontab/#{host}-#{job}.minutes"
file = File.join(modules, file)
# Get the directory portion from the file name ...
directory = File.dirname(file)
FileUtils.mkdir_p(directory) unless File.directory?(directory)
if FileTest.exists?(file)
File.open(file, 'r') { |f| value = f.read.to_i }
raise(Puppet::ParseError, "The value for minutes in the file `%s' " +
"is out of the range from 0 to 59 inclusive") unless value < 60
else
#
# Pick a random number based on the job and host name. This will yield
# the same value for exactly the same combination of the job and host name.
#
value = MD5.new(job_name + host).to_s.hex % 60
# Minutes are from 0 to 59 inclusive ...
value = value < 60 ? value : 59
File.open(file, 'w') { |f| f.write(value) }
end
# Tell Puppet to keep an eye on this file ...
parser = Puppet::Parser::Parser.new(environment)
parser.watch_file(file) if File.exists?(file)
return value
end
end
# vim: set ts=2 sw=2 et :
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