(maint) Add *BSD kernelversion and kernelmajversion facts (#462)

lib/facts/bsd/kernelmajversion.rb

@@ -0,0 +1,16 @@
+# frozen_string_literal: true
+
+module Facts
+  module Bsd
+    class Kernelmajversion
+      FACT_NAME = 'kernelmajversion'
+
+      def call_the_resolver
+        full_version = Facter::Resolvers::Uname.resolve(:kernelrelease)
+        versions_split = full_version.split('.')
+        major_version = versions_split[0]
+        Facter::ResolvedFact.new(FACT_NAME, major_version)
+      end
+    end
+  end
+end

lib/facts/bsd/kernelversion.rb

@@ -0,0 +1,14 @@
+# frozen_string_literal: true
+
+module Facts
+  module Bsd
+    class Kernelversion
+      FACT_NAME = 'kernelversion'
+
+      def call_the_resolver
+        fact_value = Facter::Resolvers::Uname.resolve(:kernelrelease).sub(/\A(\d+(\.\d+)*).*/, '\1')
+        Facter::ResolvedFact.new(FACT_NAME, fact_value)
+      end
+    end
+  end
+end

spec/facter/facts/bsd/kernelmajversion_spec.rb

@@ -0,0 +1,24 @@
+# frozen_string_literal: true
+
+describe Facts::Bsd::Kernelmajversion do
+  describe '#call_the_resolver' do
+    subject(:fact) { Facts::Bsd::Kernelmajversion.new }
+
+    let(:fact_value) { '12' }
+    let(:resolver_value) { '12.1-RELEASE-p3' }
+
+    before do
+      allow(Facter::Resolvers::Uname).to receive(:resolve).with(:kernelrelease).and_return(resolver_value)
+    end
+
+    it 'calls Facter::Resolvers::OsLevel' do
+      fact.call_the_resolver
+      expect(Facter::Resolvers::Uname).to have_received(:resolve).with(:kernelrelease)
+    end
+
+    it 'returns kernelmajversion fact' do
+      expect(fact.call_the_resolver).to be_an_instance_of(Facter::ResolvedFact).and \
+        have_attributes(name: 'kernelmajversion', value: fact_value)
+    end
+  end
+end

spec/facter/facts/bsd/kernelversion_spec.rb

@@ -0,0 +1,24 @@
+# frozen_string_literal: true
+
+describe Facts::Bsd::Kernelversion do
+  describe '#call_the_resolver' do
+    subject(:fact) { Facts::Bsd::Kernelversion.new }
+
+    let(:resolver_value) { '12.1-RELEASE-p3' }
+    let(:fact_value) { '12.1' }
+
+    before do
+      allow(Facter::Resolvers::Uname).to receive(:resolve).with(:kernelrelease).and_return(resolver_value)
+    end
+
+    it 'calls Facter::Resolvers::OsLevel' do
+      fact.call_the_resolver
+      expect(Facter::Resolvers::Uname).to have_received(:resolve).with(:kernelrelease)
+    end
+
+    it 'returns kernelversion fact' do
+      expect(fact.call_the_resolver).to be_an_instance_of(Facter::ResolvedFact).and \
+        have_attributes(name: 'kernelversion', value: fact_value)
+    end
+  end
+end