fixed the race condition in the integration test TestRunContainerWithBridgeNone

Signed-off-by: Arash Deshmeh <adeshmeh@ca.ibm.com>

integration-cli/docker_cli_daemon_test.go

@@ -1487,34 +1487,6 @@ func (s *DockerDaemonSuite) TestCleanupMountsAfterGracefulShutdown(c *check.C) {
 	c.Assert(strings.Contains(string(mountOut), id), check.Equals, false, comment)
 }
 
-func (s *DockerDaemonSuite) TestRunContainerWithBridgeNone(c *check.C) {
-	testRequires(c, DaemonIsLinux, NotUserNamespace)
-	s.d.StartWithBusybox(c, "-b", "none")
-
-	out, err := s.d.Cmd("run", "--rm", "busybox", "ip", "l")
-	c.Assert(err, check.IsNil, check.Commentf("Output: %s", out))
-	c.Assert(strings.Contains(out, "eth0"), check.Equals, false,
-		check.Commentf("There shouldn't be eth0 in container in default(bridge) mode when bridge network is disabled: %s", out))
-
-	out, err = s.d.Cmd("run", "--rm", "--net=bridge", "busybox", "ip", "l")
-	c.Assert(err, check.IsNil, check.Commentf("Output: %s", out))
-	c.Assert(strings.Contains(out, "eth0"), check.Equals, false,
-		check.Commentf("There shouldn't be eth0 in container in bridge mode when bridge network is disabled: %s", out))
-	// the extra grep and awk clean up the output of `ip` to only list the number and name of
-	// interfaces, allowing for different versions of ip (e.g. inside and outside the container) to
-	// be used while still verifying that the interface list is the exact same
-	cmd := exec.Command("sh", "-c", "ip l | grep -E '^[0-9]+:' | awk -F: ' { print $1\":\"$2 } '")
-	stdout := bytes.NewBuffer(nil)
-	cmd.Stdout = stdout
-	if err := cmd.Run(); err != nil {
-		c.Fatal("Failed to get host network interface")
-	}
-	out, err = s.d.Cmd("run", "--rm", "--net=host", "busybox", "sh", "-c", "ip l | grep -E '^[0-9]+:' | awk -F: ' { print $1\":\"$2 } '")
-	c.Assert(err, check.IsNil, check.Commentf("Output: %s", out))
-	c.Assert(out, check.Equals, fmt.Sprintf("%s", stdout),
-		check.Commentf("The network interfaces in container should be the same with host when --net=host when bridge network is disabled: %s", out))
-}
-
 func (s *DockerDaemonSuite) TestDaemonRestartWithContainerRunning(t *check.C) {
 	s.d.StartWithBusybox(t)
 	if out, err := s.d.Cmd("run", "-d", "--name", "test", "busybox", "top"); err != nil {

integration/network/helpers.go

@@ -3,6 +3,7 @@ package network
 import (
 	"context"
 	"fmt"
+	"os"
 	"testing"
 
 	"github.com/docker/docker/api/types"
@@ -83,3 +84,9 @@ func CheckKernelMajorVersionGreaterOrEqualThen(kernelVersion int, majorVersion i
 	}
 	return true
 }
+
+// IsUserNamespace returns whether the user namespace remapping is enabled
+func IsUserNamespace() bool {
+	root := os.Getenv("DOCKER_REMAP_ROOT")
+	return root != ""
+}

integration/network/network_test.go

@@ -0,0 +1,58 @@
+package network // import "github.com/docker/docker/integration/network"
+
+import (
+	"bytes"
+	"context"
+	"os/exec"
+	"strings"
+	"testing"
+
+	"github.com/docker/docker/api/types"
+	"github.com/docker/docker/integration/internal/container"
+	"github.com/docker/docker/internal/test/daemon"
+	"gotest.tools/assert"
+	is "gotest.tools/assert/cmp"
+	"gotest.tools/skip"
+)
+
+func TestRunContainerWithBridgeNone(t *testing.T) {
+	skip.If(t, testEnv.IsRemoteDaemon, "cannot start daemon on remote test run")
+	skip.If(t, testEnv.DaemonInfo.OSType != "linux")
+	skip.If(t, IsUserNamespace())
+
+	d := daemon.New(t)
+	d.StartWithBusybox(t, "-b", "none")
+	defer d.Stop(t)
+
+	client, err := d.NewClient()
+	assert.Check(t, err, "error creating client")
+
+	ctx := context.Background()
+	id1 := container.Run(t, ctx, client)
+	defer client.ContainerRemove(ctx, id1, types.ContainerRemoveOptions{Force: true})
+
+	result, err := container.Exec(ctx, client, id1, []string{"ip", "l"})
+	assert.NilError(t, err)
+	assert.Check(t, is.Equal(false, strings.Contains(result.Combined(), "eth0")), "There shouldn't be eth0 in container in default(bridge) mode when bridge network is disabled")
+
+	id2 := container.Run(t, ctx, client, container.WithNetworkMode("bridge"))
+	defer client.ContainerRemove(ctx, id2, types.ContainerRemoveOptions{Force: true})
+
+	result, err = container.Exec(ctx, client, id2, []string{"ip", "l"})
+	assert.NilError(t, err)
+	assert.Check(t, is.Equal(false, strings.Contains(result.Combined(), "eth0")), "There shouldn't be eth0 in container in bridge mode when bridge network is disabled")
+
+	nsCommand := "ls -l /proc/self/ns/net | awk -F '->' '{print $2}'"
+	cmd := exec.Command("sh", "-c", nsCommand)
+	stdout := bytes.NewBuffer(nil)
+	cmd.Stdout = stdout
+	err = cmd.Run()
+	assert.NilError(t, err, "Failed to get current process network namespace: %+v", err)
+
+	id3 := container.Run(t, ctx, client, container.WithNetworkMode("host"))
+	defer client.ContainerRemove(ctx, id3, types.ContainerRemoveOptions{Force: true})
+
+	result, err = container.Exec(ctx, client, id3, []string{"sh", "-c", nsCommand})
+	assert.NilError(t, err)
+	assert.Check(t, is.Equal(stdout.String(), result.Combined()), "The network namspace of container should be the same with host when --net=host and bridge network is disabled")
+}