Add include_legacy_facts setting

When set to false (the default for Puppet 8+), all legacy facts are
pruned before the catalog is compiled.

lib/rspec-puppet.rb

@@ -62,6 +62,7 @@ def self.current_example
   c.add_setting :fixture_hiera_configs, default: {}
   c.add_setting :use_fixture_spec_hiera, default: false
   c.add_setting :fallback_to_default_hiera, default: true
+  c.add_setting :include_legacy_facts, default: Gem::Version.new(Puppet::PUPPETVERSION) < Gem::Version.new('8.0.0')
 
   c.instance_eval do
     def trusted_server_facts

lib/rspec-puppet/adapters.rb

@@ -173,7 +173,8 @@ def settings_map
           %i[environmentpath environmentpath],
           %i[hiera_config hiera_config],
           %i[strict_variables strict_variables],
-          %i[manifest manifest]
+          %i[manifest manifest],
+          %i[include_legacy_facts include_legacy_facts]
         )
       end
 
@@ -270,7 +271,8 @@ def setup_puppet(example_group)
       def settings_map
         super.push(
           %i[basemodulepath basemodulepath],
-          %i[vendormoduledir vendormoduledir]
+          %i[vendormoduledir vendormoduledir],
+          %i[include_legacy_facts include_legacy_facts]
         )
       end
 

lib/rspec-puppet/legacy_facts.rb

@@ -0,0 +1,130 @@
+module RspecPuppet
+  # This module contains lists of all legacy facts
+  module LegacyFacts
+    # Used to determine if a fact is a legacy fact or not
+    #
+    # @return [Boolean] Is the fact a legacy fact
+    # @param [String] fact Fact name
+    def self.legacy_fact?(fact)
+      legacy_facts.include?(fact.to_sym) or fact.match(Regexp.union(legacy_fact_regexes))
+    end
+
+    # @api private
+    def self.legacy_fact_regexes
+      [
+        /\Ablockdevice_(?<devicename>.+)_model\Z/,
+        /\Ablockdevice_(?<devicename>.+)_size\Z/,
+        /\Ablockdevice_(?<devicename>.+)_vendor\Z/,
+        /\Aipaddress6_(?<interface>.+)\Z/,
+        /\Aipaddress_(?<interface>.+)\Z/,
+        /\Amacaddress_(?<interface>.+)\Z/,
+        /\Amtu_(?<interface>.+)\Z/,
+        /\Anetmask6_(?<interface>.+)\Z/,
+        /\Anetmask_(?<interface>.+)\Z/,
+        /\Anetwork6_(?<interface>.+)\Z/,
+        /\Anetwork_(?<interface>.+)\Z/,
+        /\Ascope6_(?<interface>.+)\Z/,
+        /\Aldom_(?<name>.+)\Z/,
+        /\Aprocessor\d+\Z/,
+        /\Asp_(?<name>.+)\Z/,
+        /\Assh(?<algorithm>.+)key\Z/,
+        /\Asshfp_(?<algorithm>.+)\Z/,
+        /\Azone_(?<name>.+)_brand\Z/,
+        /\Azone_(?<name>.+)_id\Z/,
+        /\Azone_(?<name>.+)_iptype\Z/,
+        /\Azone_(?<name>.+)_name\Z/,
+        /\Azone_(?<name>.+)_path\Z/,
+        /\Azone_(?<name>.+)_status\Z/,
+        /\Azone_(?<name>.+)_uuid\Z/
+      ]
+    end
+
+    # @api private
+    def self.legacy_facts
+      %i[
+        architecture
+        augeasversion
+        blockdevices
+        bios_release_date
+        bios_vendor
+        bios_version
+        boardassettag
+        boardmanufacturer
+        boardproductname
+        boardserialnumber
+        chassisassettag
+        chassistype
+        dhcp_servers
+        domain
+        fqdn
+        gid
+        hardwareisa
+        hardwaremodel
+        hostname
+        id
+        interfaces
+        ipaddress
+        ipaddress6
+        lsbdistcodename
+        lsbdistdescription
+        lsbdistid
+        lsbdistrelease
+        lsbmajdistrelease
+        lsbminordistrelease
+        lsbrelease
+        macaddress
+        macosx_buildversion
+        macosx_productname
+        macosx_productversion
+        macosx_productversion_major
+        macosx_productversion_minor
+        macosx_productversion_patch
+        manufacturer
+        memoryfree
+        memoryfree_mb
+        memorysize
+        memorysize_mb
+        netmask
+        netmask6
+        network
+        network6
+        operatingsystem
+        operatingsystemmajrelease
+        operatingsystemrelease
+        osfamily
+        physicalprocessorcount
+        processorcount
+        productname
+        rubyplatform
+        rubysitedir
+        rubyversion
+        scope6
+        selinux
+        selinux_config_mode
+        selinux_config_policy
+        selinux_current_mode
+        selinux_enforced
+        selinux_policyversion
+        serialnumber
+        swapencrypted
+        swapfree
+        swapfree_mb
+        swapsize
+        swapsize_mb
+        windows_edition_id
+        windows_installation_type
+        windows_product_name
+        windows_release_id
+        system32
+        uptime
+        uptime_days
+        uptime_hours
+        uptime_seconds
+        uuid
+        xendomains
+        zonename
+        zones
+      ]
+    end
+  end
+end

lib/rspec-puppet/support.rb

@@ -4,6 +4,7 @@
 require 'rspec-puppet/adapters'
 require 'rspec-puppet/raw_string'
 require 'rspec-puppet/sensitive'
+require 'rspec-puppet/legacy_facts'
 
 module RSpec::Puppet
   module Support
@@ -285,6 +286,10 @@ def facts_hash(node)
       # Facter currently supports lower case facts.  Bug FACT-777 has been submitted to support case sensitive
       # facts.
       result_facts.transform_keys(&:downcase)
+
+      # Prune legacy facts wherever they came from (rspec-puppet, rspec-puppet-facts, default_facts etc.)
+      result_facts.delete_if { |fact, _value| RspecPuppet::LegacyFacts.legacy_fact?(fact) } unless RSpec.configuration.include_legacy_facts
+      result_facts
     end
 
     def node_params_hash