On 28/08/17 00:45, John Baird wrote:
The backend function receives a path in the options hash - that path is
guaranteed to exist - all non existing paths are simply skipped by
hiera
(see the linked docs how it works). Thus, you do not need to use any of
the find file, etc. You can use relative paths in the hiera.yaml config
and hiera will figure it out (see the docs).
Henrik,
I believe I fully understand the context here, however, is the "options"
hash not fully referenced within the "hiera.yaml" ? Basically, how do I
access the lookup of the key itself from within a puppet manifest as an
appendage of the options['path']. I really believe that is the piece I
am just not able to connect. Can you help me understand how to do this?
Thanks!
Not quite sure exactly where there is a piece of information missing, so
pardon if I explain too much here.
When hiera 5 processes a lookup it will visit each entry in the
hiera.yaml. Such an entry may use one out of several ways to specify a
set of file paths to check for existence (path, paths, glob). If the
path corresponds to something existing, a call is made to the function
associated with that entry. It receives an options hash where path is
set to the path that was found to be existing. This is repeated for all
the existing paths found in that entry.
A user may have given additional options in the options hash.
If the mode of the lookup is "priority" (first found) the search for a
value stops when a function produces a value for the key being searched
for. If the search is a kind of "merge" then the search continues until
all values for the key have been found.
You can use the fact that the hiera framework performs the existence
check. If you do a glob to match all of the files your function will be
called with each - then simply check if the leaf file name matches the
key being looked up. Call "not_found" for all others, and read and
return the content for the one that matches.
By doing that you get a small advantage in that you will not be
incurring checks for lots of file existence for all of the keys that are
irrelevant and never will have a matching file.
Does this help with what you were wondering about?
- henrik
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