Add option to suppress legacy facts

By default legacy facts will be removed in Puppet 8. This change mimics
that.

lib/rspec-puppet-facts.rb

@@ -2,6 +2,7 @@
 require 'facter'
 require 'facterdb'
 require 'json'
+require 'rspec-puppet-facts/legacy_facts'
 
 # The purpose of this module is to simplify the Puppet
 # module's RSpec tests by looping through all supported
@@ -25,6 +26,7 @@ module RspecPuppetFacts
   # @option opts [String,Array<String>] :hardwaremodels The OS architecture names, i.e. x86_64
   # @option opts [Array<Hash>] :supported_os If this options is provided the data
   # @option opts [String] :facterversion the facter version of which to
+  # @option opts [Boolean] :legacy_facts If legacy facts should be included
   # select facts from, e.g.: '3.6'
   # will be used instead of the "operatingsystem_support" section if the metadata file
   # even if the file is missing.
@@ -33,6 +35,7 @@ def on_supported_os(opts = {})
     opts[:hardwaremodels] = [opts[:hardwaremodels]] unless opts[:hardwaremodels].is_a? Array
     opts[:supported_os] ||= RspecPuppetFacts.meta_supported_os
     opts[:facterversion] ||= RSpec.configuration.default_facter_version
+    opts[:legacy_facts] ||= RSpec.configuration.legacy_facts
 
     # This should list all variables that on_supported_os_implementation uses
     cache_key = [
@@ -170,6 +173,7 @@ def on_supported_os_implementation(opts = {})
       os = "#{facts[:operatingsystem].downcase}-#{operatingsystemmajrelease}-#{facts[:hardwaremodel]}"
       next unless os.start_with? RspecPuppetFacts.spec_facts_os_filter if RspecPuppetFacts.spec_facts_os_filter
       facts.merge! RspecPuppetFacts.common_facts
+      facts.delete_if { |fact, _value| RspecPuppetFacts::LegacyFacts.legacy_fact?(fact) } unless opts[:legacy_facts]
       os_facts_hash[os] = RspecPuppetFacts.with_custom_facts(os, facts)
     end
 
@@ -395,10 +399,15 @@ def self.facter_version_for_puppet_version(puppet_version)
   ensure
     fd.close if fd
   end
+
+  def self.legacy_facts_default_for_puppet_version(puppet_version)
+    Gem::Version.new(puppet_version) < Gem::Version.new('8.0.0')
+  end
 end
 
 RSpec.configure do |c|
   c.add_setting :default_facter_version,
     :default => RspecPuppetFacts.facter_version_for_puppet_version(Puppet.version)
   c.add_setting :facterdb_string_keys, :default => false
+  c.add_setting :legacy_facts, :default => RspecPuppetFacts.legacy_facts_default_for_puppet_version(Puppet.version)
 end

lib/rspec-puppet-facts/legacy_facts.rb

@@ -0,0 +1,130 @@
+module RspecPuppetFacts
+  # 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 [Symbol] fact Fact name
+    def self.legacy_fact?(fact)
+      legacy_facts.include?(fact) or fact.to_s.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