Add support for clock setup (#1047)

This adds support for setting clock offset and timers.

See https://libvirt.org/formatdomain.html#elementsTime for more info.

spec/unit/action/start_domain_spec.rb

@@ -27,7 +27,9 @@ describe VagrantPlugins::ProviderLibvirt::Action::StartDomain do
 
       allow(connection).to receive(:servers).and_return(servers)
       allow(servers).to receive(:get).and_return(domain)
+
       expect(logger).to receive(:info)
+      expect(ui).to_not receive(:error)
     end
 
     context 'default config' do
@@ -164,5 +166,66 @@ describe VagrantPlugins::ProviderLibvirt::Action::StartDomain do
         end
       end
     end
+
+    context 'clock_timers' do
+      let(:test_file) { 'clock_timer_rtc.xml' }
+
+      before do
+        allow(libvirt_domain).to receive(:xml_desc).and_return(domain_xml)
+
+        allow(libvirt_domain).to receive(:max_memory).and_return(512*1024)
+        allow(libvirt_domain).to receive(:num_vcpus).and_return(1)
+      end
+
+      context 'timers unchanged' do
+        let(:vagrantfile_providerconfig) do
+          <<-EOF
+          libvirt.clock_timer(:name => "rtc")
+          EOF
+        end
+
+        it 'should not modify the domain' do
+          expect(logger).to_not receive(:debug).with('clock timers config changed')
+          expect(servers).to_not receive(:create)
+          expect(libvirt_domain).to receive(:autostart=)
+          expect(domain).to receive(:start)
+
+          expect(subject.call(env)).to be_nil
+        end
+      end
+
+      context 'timers added' do
+        let(:vagrantfile_providerconfig) do
+          <<-EOF
+          libvirt.clock_timer(:name => "rtc")
+          libvirt.clock_timer(:name => "tsc")
+          EOF
+        end
+
+        it 'should modify the domain' do
+          expect(libvirt_domain).to receive(:undefine)
+          expect(logger).to receive(:debug).with('clock timers config changed')
+          expect(servers).to receive(:create).with(xml: match(/<clock offset='utc'>\s*<timer name='rtc'\/>\s*<timer name='tsc'\/>\s*<\/clock>/))
+          expect(libvirt_domain).to receive(:autostart=)
+          expect(domain).to receive(:start)
+
+          expect(subject.call(env)).to be_nil
+        end
+      end
+
+      context 'timers removed' do
+        let(:updated_test_file) { 'default.xml' }
+
+        it 'should modify the domain' do
+          expect(libvirt_domain).to receive(:undefine)
+          expect(logger).to receive(:debug).with('clock timers config changed')
+          expect(servers).to receive(:create).with(xml: match(/<clock offset='utc'>\s*<\/clock>/))
+          expect(libvirt_domain).to receive(:autostart=)
+          expect(domain).to receive(:start)
+
+          expect(subject.call(env)).to be_nil
+        end
+      end
+    end
   end
 end

spec/unit/action/start_domain_spec/clock_timer_rtc.xml

@@ -0,0 +1,50 @@
+<domain xmlns:qemu='http://libvirt.org/schemas/domain/qemu/1.0' type=''>
+  <name/>
+  <title/>
+  <description/>
+  <uuid/>
+  <memory/>
+  <vcpu>1</vcpu>
+
+
+  <cpu mode='host-model'>
+      <model fallback='allow'/>
+  </cpu>
+
+
+  <os>
+        <type>hvm</type>
+    <kernel/>
+    <initrd/>
+    <cmdline/>
+  </os>
+  <features>
+    <acpi/>
+    <apic/>
+    <pae/>
+  </features>
+  <clock offset='utc'>
+    <timer name='rtc'/>
+  </clock>
+  <devices>
+
+
+    <serial type='pty'>
+      <target port='0'/>
+    </serial>
+    <console type='pty'>
+      <target port='0'/>
+    </console>
+
+
+    <input bus='ps2' type='mouse'/>
+
+      <graphics autoport='yes' keymap='en-us' listen='127.0.0.1' port='-1' type='vnc'/>
+      <video>
+        <model heads='1' type='cirrus' vram='9216'/>
+      </video>
+
+
+  </devices>
+
+</domain>