From 8958ea0f2d8ccc6b8f25c75b2030b9c2a325e975 Mon Sep 17 00:00:00 2001
From: Jose Diaz-Gonzalez <email@josediazgonzalez.com>
Date: Wed, 15 Jan 2020 14:15:50 -0500
Subject: [PATCH] feat: add support for host-mode networking

In host-mode, there is no 'bridge' network by default, so we return an invalid IP address of 'no value'. Instead, return '127.0.0.1' for those containers.
---
 plugins/network/network.go |  6 ++++++
 tests/unit/20_network.bats | 17 +++++++++++++++++
 2 files changed, 23 insertions(+)

diff --git a/plugins/network/network.go b/plugins/network/network.go
index be9b98a44..d5b671fd1 100644
--- a/plugins/network/network.go
+++ b/plugins/network/network.go
@@ -95,6 +95,12 @@ func GetContainerIpaddress(appName, processType, containerID string) (ipAddr str
 		return
 	}
 
+	if b, err := common.DockerInspect(containerID, "'{{ .HostConfig.NetworkMode }}'"); err == nil {
+		if string(b[:]) == "host" {
+			return "127.0.0.1"
+		}
+	}
+
 	b, err := common.DockerInspect(containerID, "'{{.NetworkSettings.Networks.bridge.IPAddress}}'")
 	if err != nil || len(b) == 0 {
 		// docker < 1.9 compatibility
diff --git a/tests/unit/20_network.bats b/tests/unit/20_network.bats
index 19e9dc118..8b54dc08a 100644
--- a/tests/unit/20_network.bats
+++ b/tests/unit/20_network.bats
@@ -67,3 +67,20 @@ assert_external_port() {
     assert_external_port $(< $CID_FILE) failure
   done
 }
+
+@test "(proxy) network host-mode" {
+  run /bin/bash -c "dokku docker-options:add $TEST_APP deploy \"--network=host\""
+  echo "output: $output"
+  echo "status: $status"
+  assert_success
+
+  run deploy_app
+  echo "output: $output"
+  echo "status: $status"
+  assert_success
+
+  run /bin/bash -c "curl --silent --write-out '%{http_code}\n' `dokku url $TEST_APP` | grep 200"
+  echo "output: $output"
+  echo "status: $status"
+  assert_success
+}