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module Puppet::Parser::Functions newfunction(:source_exists, :type => :rvalue) do |args| dist = args[0] file = args[1] path = "/var/lib/puppet/dist/" + dist + file File.exists?(path) end end err: Could not retrieve catalog: Could not parse for environment production: Function 'source_exists' does not return a value at /etc/puppet/manifests/classes/common-pam.pp:2

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