Add container not found check in stop & remove

Add error checks in StopContainer() and RemoveContainer() to return nil
when the container is not found. This helps avoid failure when VM stop
or remove is executed and the containers don't exist anymore, resulting
in no-op and a successful stop and remove execution.

pkg/runtime/containerd/client.go

@@ -574,6 +574,11 @@ func withDevices(devices []*runtime.Bind) oci.SpecOpts {
 func (cc *ctdClient) StopContainer(container string, timeout *time.Duration) (err error) {
 	cont, err := cc.client.LoadContainer(cc.ctx, container)
 	if err != nil {
+		// If the container is not found, return nil, no-op.
+		if errdefs.IsNotFound(err) {
+			log.Warn(err)
+			err = nil
+		}
 		return
 	}
 
@@ -596,6 +601,11 @@ func (cc *ctdClient) StopContainer(container string, timeout *time.Duration) (er
 
 	task, err := cont.Task(cc.ctx, cio.Load)
 	if err != nil {
+		// If the task is not found, return nil, no-op.
+		if errdefs.IsNotFound(err) {
+			log.Warn(err)
+			err = nil
+		}
 		return
 	}
 

pkg/runtime/docker/client.go

@@ -185,6 +185,11 @@ func (dc *dockerClient) StopContainer(container string, timeout *time.Duration)
 	<-readyC // wait until removal detection has started
 
 	if err := dc.client.ContainerStop(context.Background(), container, timeout); err != nil {
+		// If the container is not found, return nil, no-op.
+		if errdefs.IsNotFound(err) {
+			log.Warn(err)
+			return nil
+		}
 		return err
 	}
 
@@ -225,6 +230,11 @@ func (dc *dockerClient) RemoveContainer(container string) error {
 
 	<-readyC // The ready channel is used to wait until removal detection has started
 	if err := dc.client.ContainerRemove(context.Background(), container, types.ContainerRemoveOptions{}); err != nil {
+		// If the container is not found, return nil, no-op.
+		if errdefs.IsNotFound(err) {
+			log.Warn(err)
+			return nil
+		}
 		return err
 	}