Implement to set a domainname

opencontainers/runtime-spec#1156

Signed-off-by: utam0k <k0ma@utam0k.jp>

libcontainer/configs/validate/validator.go

@@ -23,7 +23,7 @@ func Validate(config *configs.Config) error {
 		cgroupsCheck,
 		rootfs,
 		network,
-		hostname,
+		uts,
 		security,
 		namespaces,
 		sysctl,
@@ -75,10 +75,13 @@ func network(config *configs.Config) error {
 	return nil
 }
 
-func hostname(config *configs.Config) error {
+func uts(config *configs.Config) error {
 	if config.Hostname != "" && !config.Namespaces.Contains(configs.NEWUTS) {
 		return errors.New("unable to set hostname without a private UTS namespace")
 	}
+	if config.Domainname != "" && !config.Namespaces.Contains(configs.NEWUTS) {
+		return errors.New("unable to set domainname without a private UTS namespace")
+	}
 	return nil
 }
 

libcontainer/configs/validate/validator_test.go

@@ -82,7 +82,25 @@ func TestValidateHostname(t *testing.T) {
 	}
 }
 
-func TestValidateHostnameWithoutUTSNamespace(t *testing.T) {
+func TestValidateUTS(t *testing.T) {
+	config := &configs.Config{
+		Rootfs:     "/var",
+		Domainname: "runc",
+		Hostname:   "runc",
+		Namespaces: configs.Namespaces(
+			[]configs.Namespace{
+				{Type: configs.NEWUTS},
+			},
+		),
+	}
+
+	err := Validate(config)
+	if err != nil {
+		t.Errorf("Expected error to not occur: %+v", err)
+	}
+}
+
+func TestValidateUTSWithoutUTSNamespace(t *testing.T) {
 	config := &configs.Config{
 		Rootfs:   "/var",
 		Hostname: "runc",
@@ -92,6 +110,16 @@ func TestValidateHostnameWithoutUTSNamespace(t *testing.T) {
 	if err == nil {
 		t.Error("Expected error to occur but it was nil")
 	}
+
+	config = &configs.Config{
+		Rootfs:     "/var",
+		Domainname: "runc",
+	}
+
+	err = Validate(config)
+	if err == nil {
+		t.Error("Expected error to occur but it was nil")
+	}
 }
 
 func TestValidateSecurityWithMaskPaths(t *testing.T) {