CloudInstance virt type

Allow the setting and getting of the virt-type for a cloud instance.
We now require that a virt-type is set in the hardware characteristics
of an instance. This means that for migration import and export we also
need to send that information over the wire.

This PR exposes the virt-type for that to work.

cloudinstance.go

@@ -25,6 +25,7 @@ type CloudInstance interface {
 	CpuPower() uint64
 	Tags() []string
 	AvailabilityZone() string
+	VirtType() string
 	CharmProfiles() []string
 
 	Validate() error
@@ -43,6 +44,7 @@ type CloudInstanceArgs struct {
 	CpuPower         uint64
 	Tags             []string
 	AvailabilityZone string
+	VirtType         string
 	CharmProfiles    []string
 }
 
@@ -52,7 +54,7 @@ func newCloudInstance(args CloudInstanceArgs) *cloudInstance {
 	profiles := make([]string, len(args.CharmProfiles))
 	copy(profiles, args.CharmProfiles)
 	return &cloudInstance{
-		Version:           5,
+		Version:           6,
 		InstanceId_:       args.InstanceId,
 		DisplayName_:      args.DisplayName,
 		Architecture_:     args.Architecture,
@@ -63,6 +65,7 @@ func newCloudInstance(args CloudInstanceArgs) *cloudInstance {
 		CpuPower_:         args.CpuPower,
 		Tags_:             tags,
 		AvailabilityZone_: args.AvailabilityZone,
+		VirtType_:         args.VirtType,
 		CharmProfiles_:    profiles,
 		StatusHistory_:    newStatusHistory(),
 	}
@@ -95,6 +98,7 @@ type cloudInstance struct {
 	CpuPower_         uint64   `yaml:"cpu-power,omitempty"`
 	Tags_             []string `yaml:"tags,omitempty"`
 	AvailabilityZone_ string   `yaml:"availability-zone,omitempty"`
+	VirtType_         string   `yaml:"virt-type,omitempty"`
 	CharmProfiles_    []string `yaml:"charm-profiles,omitempty"`
 }
 
@@ -178,6 +182,11 @@ func (c *cloudInstance) AvailabilityZone() string {
 	return c.AvailabilityZone_
 }
 
+// VirtType implements CloudInstance.
+func (c *cloudInstance) VirtType() string {
+	return c.VirtType_
+}
+
 // CharmProfiles implements CloudInstance.
 func (c *cloudInstance) CharmProfiles() []string {
 	profiles := make([]string, len(c.CharmProfiles_))
@@ -216,6 +225,7 @@ var cloudInstanceFieldsFuncs = map[int]fieldsFunc{
 	3: cloudInstanceV3Fields,
 	4: cloudInstanceV4Fields,
 	5: cloudInstanceV5Fields,
+	6: cloudInstanceV6Fields,
 }
 
 func cloudInstanceV1Fields() (schema.Fields, schema.Defaults) {
@@ -273,6 +283,13 @@ func cloudInstanceV5Fields() (schema.Fields, schema.Defaults) {
 	return fields, defaults
 }
 
+func cloudInstanceV6Fields() (schema.Fields, schema.Defaults) {
+	fields, defaults := cloudInstanceV5Fields()
+	fields["virt-type"] = schema.String()
+	defaults["virt-type"] = ""
+	return fields, defaults
+}
+
 func importCloudInstanceVx(source map[string]interface{}, version int, fieldFunc func() (schema.Fields, schema.Defaults)) (*cloudInstance, error) {
 	fields, defaults := fieldFunc()
 	checker := schema.FieldMap(fields, defaults)
@@ -334,6 +351,10 @@ func newCloudInstanceFromValid(valid map[string]interface{}, importVersion int)
 		if importVersion > 4 {
 			instance.RootDiskSource_ = valid["root-disk-source"].(string)
 		}
+
+		if importVersion > 5 {
+			instance.VirtType_ = valid["virt-type"].(string)
+		}
 	default:
 		return nil, errors.NotValidf("unexpected version: %d", importVersion)
 	}

cloudinstance_test.go

@@ -25,7 +25,7 @@ func (s *CloudInstanceSerializationSuite) SetUpTest(c *gc.C) {
 
 func minimalCloudInstanceMap() map[interface{}]interface{} {
 	return map[interface{}]interface{}{
-		"version":             5,
+		"version":             6,
 		"instance-id":         "instance id",
 		"status":              minimalStatusMap(),
 		"status-history":      emptyStatusHistoryMap(),
@@ -66,6 +66,7 @@ func (s *CloudInstanceSerializationSuite) TestNewCloudInstance(c *gc.C) {
 	c.Check(instance.RootDiskSource(), gc.Equals, args.RootDiskSource)
 	c.Check(instance.CpuCores(), gc.Equals, args.CpuCores)
 	c.Check(instance.CpuPower(), gc.Equals, args.CpuPower)
+	c.Check(instance.VirtType(), gc.Equals, args.VirtType)
 	c.Check(instance.AvailabilityZone(), gc.Equals, args.AvailabilityZone)
 
 	// Before we check tags, modify args to make sure that the instance ones
@@ -171,6 +172,7 @@ func (s *CloudInstanceSerializationSuite) testArgs() CloudInstanceArgs {
 		CpuPower:         4000,
 		Tags:             []string{"much", "strong"},
 		AvailabilityZone: "everywhere",
+		VirtType:         "container",
 		CharmProfiles:    []string{"much", "strong"},
 	}
 }
@@ -206,6 +208,7 @@ func (s *CloudInstanceSerializationSuite) TestParsingV4Full(c *gc.C) {
 	imported := s.importCloudInstance(c, original)
 	expected := s.testCloudInstance()
 	expected.RootDiskSource_ = ""
+	expected.VirtType_ = ""
 	expected.Version = 4
 	c.Assert(imported, jc.DeepEquals, expected)
 }
@@ -257,6 +260,8 @@ func (s *CloudInstanceSerializationSuite) TestParsingV5Full(c *gc.C) {
 	original := s.allV5Map()
 	imported := s.importCloudInstance(c, original)
 	expected := s.testCloudInstance()
+	expected.VirtType_ = ""
+	expected.Version = 5
 	c.Assert(imported, jc.DeepEquals, expected)
 }
 
@@ -272,5 +277,49 @@ func (s *CloudInstanceSerializationSuite) TestParsingV5Minimal(c *gc.C) {
 	expected := newCloudInstance(minimalCloudInstanceArgs())
 	expected.SetStatus(minimalStatusArgs())
 	expected.SetModificationStatus(minimalStatusArgs())
+	expected.Version = 5
+	c.Assert(imported, jc.DeepEquals, expected)
+}
+
+func (s *CloudInstanceSerializationSuite) allV6Map() map[string]interface{} {
+	return map[string]interface{}{
+		"version":             6,
+		"instance-id":         "instance id",
+		"display-name":        "foo",
+		"status":              minimalStatusMap(),
+		"status-history":      emptyStatusHistoryMap(),
+		"modification-status": minimalStatusMap(),
+		"architecture":        "amd64",
+		"memory":              16 * gig,
+		"root-disk":           200 * gig,
+		"root-disk-source":    "my-house",
+		"cores":               8,
+		"cpu-power":           4000,
+		"tags":                []string{"much", "strong"},
+		"availability-zone":   "everywhere",
+		"virt-type":           "container",
+		"charm-profiles":      []string{"much", "strong"},
+	}
+}
+
+func (s *CloudInstanceSerializationSuite) TestParsingV6Full(c *gc.C) {
+	original := s.allV6Map()
+	imported := s.importCloudInstance(c, original)
+	expected := s.testCloudInstance()
+	c.Assert(imported, jc.DeepEquals, expected)
+}
+
+func (s *CloudInstanceSerializationSuite) TestParsingV6Minimal(c *gc.C) {
+	original := map[string]interface{}{
+		"version":             6,
+		"instance-id":         "instance id",
+		"status":              minimalStatusMap(),
+		"status-history":      emptyStatusHistoryMap(),
+		"modification-status": minimalStatusMap(),
+	}
+	imported := s.importCloudInstance(c, original)
+	expected := newCloudInstance(minimalCloudInstanceArgs())
+	expected.SetStatus(minimalStatusArgs())
+	expected.SetModificationStatus(minimalStatusArgs())
 	c.Assert(imported, jc.DeepEquals, expected)
 }