(FACT-2607) Add Openvz detector

lib/facts/linux/virtual.rb

@@ -7,6 +7,7 @@ class Virtual
 
       def call_the_resolver
         fact_value = check_docker_lxc || check_gce || retrieve_from_virt_what || check_vmware
+        fact_value ||= check_open_vz || check_vserver
 
         Facter::ResolvedFact.new(FACT_NAME, fact_value)
       end
@@ -27,6 +28,14 @@ def check_vmware
       def retrieve_from_virt_what
         Facter::Resolvers::VirtWhat.resolve(:vm)
       end
+
+      def check_open_vz
+        Facter::Resolvers::OpenVz.resolve(:vm)
+      end
+
+      def check_vserver
+        Facter::Resolvers::VirtWhat.resolve(:vserver)
+      end
     end
   end
 end

lib/resolvers/open_vz.rb

@@ -0,0 +1,45 @@
+# frozen_string_literal: true
+
+module Facter
+  module Resolvers
+    class OpenVz < BaseResolver
+      # build
+
+      @semaphore = Mutex.new
+      @fact_list ||= {}
+
+      class << self
+        private
+
+        def post_resolve(fact_name)
+          @fact_list.fetch(fact_name) { check_proc_vz(fact_name) }
+        end
+
+        def check_proc_vz(fact_name)
+          if !Dir.exist?('/proc/vz') || !File.executable?('/proc/lve/list') || Dir.entries('/proc/vz').count.equal?(2)
+            return
+          end
+
+          @fact_list[:vm] = read_proc_status
+          @fact_list[fact_name]
+        end
+
+        def read_proc_status
+          proc_status_content = Facter::Util::FileHelper.safe_readlines('/proc/self/status', nil)
+          return unless proc_status_content
+
+          proc_status_content.each do |line|
+            parts = line.split("\s")
+            next unless parts.size.equal?(2)
+
+            next unless /^envID:/ =~ parts[0]
+
+            return 'openvzhn' if parts[1] == '0'
+
+            return 'openvzve'
+          end
+        end
+      end
+    end
+  end
+end

spec/facter/facts/linux/virtual_spec.rb

@@ -64,6 +64,35 @@
       end
     end
 
+    context 'when is openVz' do
+      let(:vm) { nil }
+      let(:value) { 'openvzve' }
+
+      before do
+        allow(Facter::Resolvers::OpenVz).to receive(:resolve).with(:vm).and_return(value)
+      end
+
+      it 'returns virtual fact' do
+        expect(fact.call_the_resolver).to be_an_instance_of(Facter::ResolvedFact).and \
+          have_attributes(name: 'virtual', value: value)
+      end
+    end
+
+    context 'when is vserver' do
+      let(:vm) { nil }
+      let(:value) { 'vserver_host' }
+
+      before do
+        allow(Facter::Resolvers::VirtWhat).to receive(:resolve).with(:vm).and_return(nil)
+        allow(Facter::Resolvers::VirtWhat).to receive(:resolve).with(:vserver).and_return(value)
+      end
+
+      it 'returns virtual fact' do
+        expect(fact.call_the_resolver).to be_an_instance_of(Facter::ResolvedFact).and \
+          have_attributes(name: 'virtual', value: value)
+      end
+    end
+
     context 'when resolver returns nil' do
       let(:vm) { nil }
 

spec/facter/resolvers/open_vz_spec.rb

@@ -0,0 +1,50 @@
+# frozen_string_literal: true
+
+describe Facter::Resolvers::OpenVz do
+  subject(:openvz_resolver) { Facter::Resolvers::OpenVz }
+
+  let(:vz_dir) { true }
+  let(:list_executable) { true }
+
+  after do
+    openvz_resolver.invalidate_cache
+  end
+
+  before do
+    allow(Dir).to receive(:exist?).with('/proc/vz').and_return(vz_dir)
+    allow(File).to receive(:executable?).with('/proc/lve/list').and_return(list_executable)
+    allow(Dir).to receive(:entries).with('/proc/vz').and_return(vz_dir_entries)
+  end
+
+  context 'when /proc/vz dir is empty' do
+    let(:vz_dir_entries) { ['.', '..'] }
+
+    it 'returns nil' do
+      expect(openvz_resolver.resolve(:vm)).to be_nil
+    end
+  end
+
+  context 'when /proc/vz dir is not empty' do
+    let(:vz_dir_entries) { ['.', '..', 'some_file.txt'] }
+
+    before do
+      allow(Facter::Util::FileHelper).to receive(:safe_readlines).with('/proc/self/status', nil).and_return(status_file)
+    end
+
+    context 'when /proc/self/status is nil' do
+      let(:status_file) { nil }
+
+      it 'returns nil' do
+        expect(openvz_resolver.resolve(:vm)).to be_nil
+      end
+    end
+
+    context 'when /proc/self/status is readable' do
+      let(:status_file) { load_fixture('proc_self_status').readlines }
+
+      it 'returns openvzhn' do
+        expect(openvz_resolver.resolve(:vm)).to eql('openvzhn')
+      end
+    end
+  end
+end

spec/fixtures/proc_self_status

@@ -13,5 +13,6 @@ Groups:	4 20 24 25 27 29 30 44 46 108 114 1000
 NStgid:	14437
 NSpid: 14437
 NSpgid:	14437
+envID: 0
 NSsid:	14122
 VxID: 0