puppetlabs/hiera — pull request #68 by pcarlisle (2012-06-06 23:55:00+00:00)
Title: Ticket/master/12122 multiple backends

(#12122) Merge arrays and hashes across backends

This implements merging for arrays and hashes across the returned values for
all backends, using the same logic as merging within a backend.

(#12122) Correctly fall through backends during loop

When calling lookup for hash or array types Hiera would incorrectly return an
empty result from a backend that did not find a value instead of checking the
next backend. This happened because the empty hash and empty array were used
internally to represent a failed lookup. This changes it to use nil
everywhere. A distinct sentinel value would be ideal, but since Hiera
currently has no way to communicate to the outside world the difference
between lookup up nil and a failed lookup, it is sufficient to use nil internally.