Fix nginx ingress variables for definitions without hosts

internal/ingress/controller/template/template.go

@@ -880,7 +880,12 @@ func getIngressInformation(i, h, p interface{}) *ingressInformation {
 			continue
 		}
 
-		if hostname != rule.Host {
+		host := "_"
+		if rule.Host != "" {
+			host = rule.Host
+		}
+
+		if hostname != host {
 			continue
 		}
 

test/e2e/ingress/without_host.go

@@ -0,0 +1,52 @@
+/*
+Copyright 2018 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package ingress
+
+import (
+	"fmt"
+	"net/http"
+	"strings"
+
+	"github.com/onsi/ginkgo"
+
+	"k8s.io/ingress-nginx/test/e2e/framework"
+)
+
+var _ = framework.IngressNginxDescribe("[Ingress] definition without host", func() {
+	f := framework.NewDefaultFramework("ingress-without-host")
+
+	ginkgo.It("should set ingress details variables for ingresses without a host", func() {
+		f.NewEchoDeployment()
+
+		ing := framework.NewSingleIngress("default-host", "/", "", f.Namespace, framework.EchoService, 80, nil)
+		f.EnsureIngress(ing)
+
+		f.WaitForNginxServer("_",
+			func(server string) bool {
+				return strings.Contains(server, fmt.Sprintf(`set $namespace "%v";`, f.Namespace)) &&
+					strings.Contains(server, fmt.Sprintf(`set $ingress_name "%v";`, ing.Name)) &&
+					strings.Contains(server, fmt.Sprintf(`set $service_name "%v";`, framework.EchoService)) &&
+					strings.Contains(server, `set $service_port "80";`) &&
+					strings.Contains(server, `set $location_path "/";`)
+			})
+
+		f.HTTPTestClient().
+			GET("/").
+			Expect().
+			Status(http.StatusOK)
+	})
+})