Add lookup_hiera_hash function

The lookup_hiera_hash function is meant to lookup for the value
of a given key from a given Hiera hash. In the manifests this is
possible by saving the value of the hash in a variable first but
when driving lookups from the Heat templates we can't do it.

Change-Id: Ie31bb70314db44a0a18e86090cc74aa4df5de169
changes/12/320112/11
Giulio Fidente 6 years ago
parent 73a687263c
commit 4e5ebf3ad8
  1. 22
      lib/puppet/parser/functions/lookup_hiera_hash.rb
  2. 7
      spec/fixtures/hiera.yaml
  3. 3
      spec/fixtures/hieradata/default.yaml
  4. 20
      spec/functions/lookup_hiera_hash_spec.rb
  5. 1
      spec/spec_helper.rb

@ -0,0 +1,22 @@
module Puppet::Parser::Functions
newfunction(:lookup_hiera_hash, :arity => 2, :type => :rvalue,
:doc => "Lookup a key->value from a Hiera hash") do |args|
hash_name = args[0]
key_name = args[1]
unless hash_name.is_a?(String) and key_name.is_a?(String)
raise Puppet::ParseError, "The hash name and the key name must be given as strings."
end
if defined? call_function
hash = call_function('hiera', [hash_name])
else
hash = function_hiera([hash_name])
end
unless hash.is_a?(Hash)
raise Puppet::ParseError, "The value Hiera returned for #{hash_name} is not a Hash."
end
unless hash.key?(key_name)
raise Puppet::ParseError, "The Hiera hash #{hash_name} does not contain key #{key_name}."
end
return hash[key_name]
end
end

@ -0,0 +1,7 @@
---
:backends:
- yaml
:yaml:
:datadir: './spec/fixtures/hieradata'
:hierarchy:
- default

@ -0,0 +1,3 @@
my_hash:
network: '127.0.0.1'
not_hash: string

@ -0,0 +1,20 @@
require 'spec_helper'
require 'puppet'
# puppet 4.0 call_function() has no visibility of 3.x functions and will fail anyway
unless Puppet.version =~ /^4\.0/
describe 'lookup_hiera_hash' do
# working version
it { should run.with_params('my_hash', 'network').and_return('127.0.0.1') }
# raise if key does not exist
it { should run.with_params('my_hash', 'not_network').and_raise_error(Puppet::ParseError) }
# raise if hash value returned by hiera is not a hash
it { should run.with_params('not_hash', 'key').and_raise_error(Puppet::ParseError) }
# raise if arguments are not two
it { should run.with_params('hash', 'key', 'unexpected').and_raise_error(ArgumentError) }
it { should run.with_params('hash').and_raise_error(ArgumentError) }
# raise if arguments are not strings
it { should run.with_params({}, 'key').and_raise_error(Puppet::ParseError) }
it { should run.with_params('hash', true).and_raise_error(Puppet::ParseError) }
end
end

@ -6,6 +6,7 @@ fixture_path = File.expand_path(File.join(__FILE__, '..', 'fixtures'))
RSpec.configure do |c|
c.alias_it_should_behave_like_to :it_configures, 'configures'
c.alias_it_should_behave_like_to :it_raises, 'raises'
c.hiera_config = File.join(fixture_path, 'hiera.yaml')
c.module_path = File.join(fixture_path, 'modules')
c.manifest_dir = File.join(fixture_path, 'manifests')

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