@@ -35,6 +35,7 @@ import (
3535 "context"
3636 "crypto/rand"
3737 "fmt"
38+ "net"
3839 "os"
3940 "path"
4041 "runtime"
@@ -46,6 +47,7 @@ import (
4647 "github.com/containerd/continuity/testutil"
4748 "github.com/containerd/go-cni"
4849 "github.com/stretchr/testify/assert"
50+ "github.com/vishvananda/netlink"
4951)
5052
5153var (
@@ -306,6 +308,25 @@ func TestBasicSetupAndRemovePluginWithoutVersion(t *testing.T) {
306308 }
307309}
308310
311+ // TestLoopbackStatus validates whether the loopback interface state is UP.
312+ func TestLoopbackStatus (t * testing.T ) {
313+ t .Log ("Checking loopback interface status" )
314+ up , err := isLoInterfaceUp ()
315+ assert .NoError (t , err , "could not check lo interface status" )
316+
317+ t .Logf ("loopback interface status is %v" , map [bool ]string {true : "UP" , false : "DOWN" }[up ])
318+ assert .True (t , up )
319+ }
320+
321+ // isLoInterfaceUp returns true if the loopback interface status is UP, otherwise false.
322+ func isLoInterfaceUp () (bool , error ) {
323+ link , err := netlink .LinkByName ("lo" )
324+ if err != nil {
325+ return false , fmt .Errorf ("could not find interface lo: %w" , err )
326+ }
327+ return link .Attrs ().Flags & net .FlagUp != 0 , nil
328+ }
329+
309330// createNetNS returns temp netns path.
310331//
311332// NOTE: It is based on https://github.com/containernetworking/plugins/blob/v1.0.1/pkg/testutils/netns_linux.go.
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