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Current Path : /opt/puppetlabs/puppet/lib/ruby/vendor_ruby/puppet/functions/
Current File : //opt/puppetlabs/puppet/lib/ruby/vendor_ruby/puppet/functions/hiera.rb
require 'hiera/puppet_function'
# Performs a standard priority lookup of the hierarchy and returns the most specific value
# for a given key. The returned value can be any type of data.
#
# This function is deprecated in favor of the `lookup` function. While this function
# continues to work, it does **not** support:
# * `lookup_options` stored in the data
# * lookup across global, environment, and module layers
#
# The function takes up to three arguments, in this order:
#
# 1. A string key that Hiera searches for in the hierarchy. **Required**.
# 2. An optional default value to return if Hiera doesn't find anything matching the key.
#     * If this argument isn't provided and this function results in a lookup failure, Puppet
#     fails with a compilation error.
# 3. The optional name of an arbitrary
# [hierarchy level](https://puppet.com/docs/hiera/latest/hierarchy.html) to insert at the
# top of the hierarchy. This lets you temporarily modify the hierarchy for a single lookup.
#     * If Hiera doesn't find a matching key in the overriding hierarchy level, it continues
#     searching the rest of the hierarchy.
#
# The `hiera` function does **not** find all matches throughout a hierarchy, instead
# returning the first specific value starting at the top of the hierarchy. To search
# throughout a hierarchy, use the `hiera_array` or `hiera_hash` functions.
#
# @example Using `hiera`
#
# ```yaml
# # Assuming hiera.yaml
# # :hierarchy:
# #   - web01.example.com
# #   - common
#
# # Assuming web01.example.com.yaml:
# # users:
# #   - "Amy Barry"
# #   - "Carrie Douglas"
#
# # Assuming common.yaml:
# users:
#   admins:
#     - "Edith Franklin"
#     - "Ginny Hamilton"
#   regular:
#     - "Iris Jackson"
#     - "Kelly Lambert"
# ```
#
# ```puppet
# # Assuming we are not web01.example.com:
#
# $users = hiera('users', undef)
#
# # $users contains {admins  => ["Edith Franklin", "Ginny Hamilton"],
# #                  regular => ["Iris Jackson", "Kelly Lambert"]}
# ```
#
# You can optionally generate the default value with a
# [lambda](https://puppet.com/docs/puppet/latest/lang_lambdas.html) that
# takes one parameter.
#
# @example Using `hiera` with a lambda
#
# ```puppet
# # Assuming the same Hiera data as the previous example:
#
# $users = hiera('users') | $key | { "Key \'${key}\' not found" }
#
# # $users contains {admins  => ["Edith Franklin", "Ginny Hamilton"],
# #                  regular => ["Iris Jackson", "Kelly Lambert"]}
# # If hiera couldn't match its key, it would return the lambda result,
# # "Key 'users' not found".
# ```
#
# The returned value's data type depends on the types of the results. In the example
# above, Hiera matches the 'users' key and returns it as a hash.
#
# See
# [the 'Using the lookup function' documentation](https://puppet.com/docs/puppet/latest/hiera_automatic.html) for how to perform lookup of data.
# Also see
# [the 'Using the deprecated hiera functions' documentation](https://puppet.com/docs/puppet/latest/hiera_automatic.html)
# for more information about the Hiera 3 functions.
#
# @since 4.0.0
#
Puppet::Functions.create_function(:hiera, Hiera::PuppetFunction) do
  init_dispatch
end
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