From ac98ef7439c3ea6087caf3c6f07b1d9de08366ea Mon Sep 17 00:00:00 2001
From: Michael Crosby <crosbymichael@gmail.com>
Date: Mon, 15 May 2017 13:41:57 -0700
Subject: [PATCH] Add --net-host for testing host networking

Add `--net-host` to `ctr run` to test containers running in host
networking.

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>
---
 cmd/ctr/run.go      |  4 ++++
 cmd/ctr/run_unix.go | 13 ++++++++-----
 2 files changed, 12 insertions(+), 5 deletions(-)

diff --git a/cmd/ctr/run.go b/cmd/ctr/run.go
index 14fcdf92b..fe9a25aa4 100644
--- a/cmd/ctr/run.go
+++ b/cmd/ctr/run.go
@@ -51,6 +51,10 @@ var runCommand = cli.Command{
 			Name:  "readonly",
 			Usage: "set the containers filesystem as readonly",
 		},
+		cli.BoolFlag{
+			Name:  "net-host",
+			Usage: "enable host networking for the container",
+		},
 	},
 	Action: func(context *cli.Context) error {
 		var (
diff --git a/cmd/ctr/run_unix.go b/cmd/ctr/run_unix.go
index 64d765d0c..d67f77943 100644
--- a/cmd/ctr/run_unix.go
+++ b/cmd/ctr/run_unix.go
@@ -92,7 +92,7 @@ func spec(id string, config *ocispec.ImageConfig, context *cli.Context) (*specs.
 	if cwd == "" {
 		cwd = "/"
 	}
-	return &specs.Spec{
+	s := &specs.Spec{
 		Version: specs.Version,
 		Platform: specs.Platform{
 			OS:   runtime.GOOS,
@@ -211,12 +211,15 @@ func spec(id string, config *ocispec.ImageConfig, context *cli.Context) (*specs.
 				{
 					Type: "mount",
 				},
-				{
-					Type: "network",
-				},
 			},
 		},
-	}, nil
+	}
+	if !context.Bool("net-host") {
+		s.Linux.Namespaces = append(s.Linux.Namespaces, specs.LinuxNamespace{
+			Type: "network",
+		})
+	}
+	return s, nil
 }
 
 func customSpec(configPath string, rootfs string) (*specs.Spec, error) {