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diff --git a/lib/puppet/parser/functions/list_to_hash.rb b/lib/puppet/parser/functions/list_to_hash.rb
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+# This function is an hack because we are not enabling Puppet parser
+# that would allow us to manipulate data iterations directly in manifests.
+#
+# Example:
+# keystone_vips = ['192.168.0.1:5000', '192.168.0.2:5000']
+# $keystone_bind_opts = ['transparent']
+#
+# Using this function:
+# $keystone_vips_hash = list_to_hash($keystone_vips, $keystone_bind_opts)
+#
+# Would return:
+# $keystone_vips_hash = {
+# '192.168.0.1:5000' => ['transparent'],
+# '192.168.0.2:5000' => ['transparent'],
+# }
+#
+# Disclaimer: this function is an hack and will disappear once TripleO enable
+# Puppet parser.
+#
+
+module Puppet::Parser::Functions
+ newfunction(:list_to_hash, :type => :rvalue, :doc => <<-EOS
+ This function returns an hash from a specified array
+ EOS
+ ) do |argv|
+ arr1 = argv[0]
+ arr2 = argv[1]
+ h = arr1.each_with_object({}) { |v,h| h[v] = arr2 }
+ return h
+ end
+end