Failing when port is specified with labels

Resolves #522
Kompose will give FATAL error if labels are given but ports are not defined

docs/user-guide.md

@@ -400,4 +400,8 @@ If the Docker Compose file has a volume specified for a service, the Deployment
 
 If the Docker Compose file has service name with `_` in it (eg.`web_service`), then it will be replaced by `-` and the service name will be renamed accordingly (eg.`web-service`). Kompose does this because "Kubernetes" doesn't allow `_` in object name.
 
-Please note that changing service name might break some `docker-compose` files.
+Please note that changing service name might break some `docker-compose` files.
+
+#### Warning about Labels
+
+`kompose.service.type` label should be defined with `ports` only, otherwise `kompose` will fail.

pkg/loader/compose/compose.go

@@ -363,6 +363,10 @@ func (c *Compose) LoadFile(files []string) (kobject.KomposeObject, error) {
 			}
 		}
 
+		labelerr := checkLabelsPorts(len(serviceConfig.Port), composeServiceConfig.Labels["kompose.service.type"], name)
+		if labelerr != nil {
+			return kobject.KomposeObject{}, errors.Wrap(err, labelerr)
+		}
 		// convert compose labels to annotations
 		serviceConfig.Annotations = map[string]string(composeServiceConfig.Labels)
 		serviceConfig.CPUQuota = int64(composeServiceConfig.CPUQuota)
@@ -402,3 +406,10 @@ func handleServiceType(ServiceType string) (string, error) {
 func normalizeServiceNames(svcName string) string {
 	return strings.Replace(svcName, "_", "-", -1)
 }
+
+func checkLabelsPorts(noOfPort int, labels string, svcName string) error {
+	if noOfPort == 0 && labels == "NodePort" || labels == "LoadBalancer" {
+		return errors.Errorf("%s defined in service %s with no ports present. Issues may occur when bringing up artifacts.", labels, svcName)
+	}
+	return nil
+}

pkg/loader/compose/compose_test.go

@@ -286,3 +286,25 @@ func TestNormalizeServiceNames(t *testing.T) {
 		}
 	}
 }
+
+func TestCheckLabelsPorts(t *testing.T) {
+	testCases := []struct {
+		name     string
+		noOfPort int
+		labels   string
+		svcName  string
+	}{
+		{"ports is defined", 1, "NodePort", "foo"},
+		{"ports is not defined", 0, "NodePort", "foo"},
+	}
+
+	var err error
+	for _, testcase := range testCases {
+		t.Log(testcase.name)
+		err = checkLabelsPorts(testcase.noOfPort, testcase.labels, testcase.svcName)
+		if err != nil {
+			t.Log(err)
+		}
+
+	}
+}