refactor: add helpful logs

- fix segfault if warm-metal fails to fetch size from the container registry

Author: vadasambar

cmd/plugin/main.go

@@ -158,6 +158,7 @@ func main() {
 	}
 
 	if size != nil {
+		klog.Infof("'--max-image-size' is set to '%v'", size.String())
 		imagesize.Initialize(size)
 		defer imagesize.Warner.Cleanup()
 	}

pkg/remoteimage/pull.go

@@ -86,10 +86,12 @@ func (p puller) Pull(ctx context.Context, pod string, ns string) (err error) {
 
 func (p puller) checkForImageSize(cred *cri.AuthConfig, pod string, ns string) {
 	go func() {
+		klog.Infof("fetching image size from the registry for '%v'", p.image)
 		if w.Warner != nil {
 			size, err := w.Warner.GetImageSize(cred, p.image)
 			if err != nil {
 				klog.Infof("error fetching image size from the registry: %v", err)
+				return
 			}
 			w.Warner.Warn(size, pod, ns)
 		}