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# provides a "random" value to cron based on the last bit of the machine IP address.
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# used to avoid starting a certain cron job at the same time on all servers.
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# if used with no parameters, it will return a single value between 0-59
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# first argument is the occournce within a timeframe, for example if you want it to run 2 times per hour
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# the second argument is the timeframe, by default its 60 minutes, but it could also be 24 hours etc
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#
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# example usage
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# ip_to_cron() - returns one value between 0..59
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# ip_to_cron(2) - returns an array of two values between 0..59
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# ip_to_cron(2,24) - returns an array of two values between 0..23
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module Puppet::Parser::Functions
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newfunction(:ip_to_cron, :type => :rvalue) do |args|
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occours = (args[0] || 1).to_i
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scope = (args[1] || 60).to_i
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ip = lookupvar('ipaddress').to_s.split('.')[3].to_i
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base = ip % scope
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if occours == 1
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base
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else
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(1..occours).map { |i| (base - (scope / occours * i)) % scope }.sort
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end
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end
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end
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