This is a puppet function that expands two paths to an array of all discrete paths from, to. It is somewhat tested.

paths_between.rb

Puppet::Parser::Functions.newfunction( :paths_between, :type => :rvalue,
  :arity => 2,
  :doc => "Produces an array with all paths starting with the first given path to the last.
    The intended use is to create an array that is used as the title of a file resource that ensure that
    the list of directories exist, are given the wanted mode and ownership."
) do |args|
  func_name = "paths_between():"
  from = args[0]
  to = args[1]
  unless to.is_a?(String) && from.is_a?(String)
    raise ArgumentException, "#{func_name} The given paths must be strings"
  end
  if from.length < 1
    raise ArgumentError, "#{func_name} A path cannot be an empty string"
  end
  unless to.start_with?(from) && to.length > from.length
    raise ArgumentException, "#{func_name} The path #{to} must be a subpath of #{from}"
  end
  from_array = from.split(/\/|\\/)
  to_array = to.split(/\/|\\/).slice(from_array.size()..-1)

  result = [from]
  to_array.reduce(from) do |memo, part|
    memo = File.join(memo, part)
    result << memo
    memo
  end
  result
end

Hi!

This looks like a promising solution on how to create every directory in a path that you don't know ahead, such as a variable. Do you know if it works both on Linux and Windows?