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Puppet::Parser::Functions::newfunction(
:seeded_rand,
:arity => 2,
:type => :rvalue,
:doc => <<-EOS
Usage: `seeded_rand(MAX, SEED)`. MAX must be a positive integer; SEED is any string.
Generates a random whole number greater than or equal to 0 and less
than MAX, using the value of SEED for repeatable randomness. If SEED
starts with "$fqdn:", this is behaves the same as `fqdn_rand`.
EOS
) do |args|
require 'digest/md5'
raise(ArgumentError, "seeded_rand(): first argument must be a positive integer") unless function_is_integer([args[0]]) and args[0].to_i > 0
raise(ArgumentError, "seeded_rand(): second argument must be a string") unless args[1].is_a? String
max = args[0].to_i
seed = Digest::MD5.hexdigest(args[1]).hex
Puppet::Util.deterministic_rand(seed,max)
end
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